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User Manual - Eddystone Broadcast

1. sesse ee ee ee se se Ee ee ek ee ee ee ee Page 28 2 3 4 Channel and Frequency Selection and Setting During Operation iis se sees ee Page 29 2 3 5 External Channel and Frequency Selection and Locking iis see ee se ekke ee ee Page 30 2 3 6 Stereo Encoder Settings S option only ie se ee se Ee eee ee ee ee ee eek ee ee ee ek ee ee Page 30 2 4 SERIAL REMOTE CONTROL AND MONITORING ee ee ee ee ee ee ee ee eek ee eek ee ee ee Page 31 24 1 IntroduetlOn EE EE EE REDE HE EDE DE DE EE ER Ee EE di Re Ee Se ER Re SEE ebay EE Y vr Des Page 31 2 4 2 Control Commands and Status Monitor Reguest issie se ee ke ee ee ek ke ek ke ee ee Page 31 2 4 3 Reverted Status Monitor Information ses ee sek se ek ee eek ee Re ee ee ee ee ee ee ee ee ee Page 33 2 4 4 Channel and Frequency Selection and Setting under Remote Control Page 37 Print Date 06 06 11 Page 3 of 42 E2170 00MA 04 SECTION THREE OPERATION 3 1 CONTROLS AND DISPLAYS ee ese ee cece ce de ke E ee Ge ke a ka ee essa AA ee de Raakh Page 39 3 2 STATUS PERFORMANCE AND LEVEL MONITORING ee ees ee ee ee ee ees see ee ee ee Page 40 3 2 1 MAIN Display Mode Es EE Re EES RE EG EE DER es ieee eda ee ae ee ee Ee da ERK eg ee gee ee es Page 40 3 2 2 MENU of Modes Display Mode eie ee se se se se ee ee ee ee eee entree ee ee ee ke ge ee ek ee ee Page 40 3 2 3 SYSTEM Display Mod is pide nii anonanse ee ek ee ee ee dk esata ee eek ee ee ee ee
2. ese ee ee se ee see ee ee ee eek ee eek ee ee ee ee ee ee ee ee ee ee Page 10 1 31 COMMON specili ations sr RES ER NE FEE DIES KA DR EE EE EE AE GOS GES RE DEER eG BE Base Ee ER Page 10 1 3 2 Stereo Encoder Module Specifications S option only ee ee sek ee ee ke ee ee Page 14 1 3 3 Composite Input Module Specifications M option only se se ee se ek ee Re ee Page 15 1 3 4 Re Broadcast Receiver Module Specifications R option only se se se ee ee Page 16 SECTION TWO INSTALLATION 2 1 PHYSICAL DIMENSIONS AND FITTING eie se ee se ee ee ee ee eee ee ee ee ee ee ek ee ee ee Page 17 2 1 1 Installation Accessories ee ee teeter Ke Ke Ke Ke Ee AR eee ee ke ee ke ee E a ee ee ee ee Page 17 2 141 2 RACK MOUNN sioari EE EE Ge EE GE ee EE EEEE uae ge ee ge ede Ee ee Ee AE Ee ee Ge ee Page 18 22 EXTERNAL GONEGTIONS sie SS EE SLEE GEE EER ERGE ER GEE SE DEERE SR GES Re EE Geb sg ge bes EER Gees ke Page 19 2 2 1 Mains Supply ConneCtOF eie se sedani Ee eee ee ER Ee ER ee GR ee ek ee eek ee ek ee eek ek ee ee ee ke Page 19 2 2 2 RE Output GONNGCIOF s ee Ee EE ENGER Ee Ee ES GEE pees EES EE EK GEE BOE EE Geb DERE SERE ge died Page 19 2 2 3 SCA1 RDS SCA2 and SCA3 Input ConnectorS sesse ee sek ee ek ects ER ee ee eek ee Page 20 2 2 4 Mono AES Input ConneCtOF eie ee see ee see ee ee ee ee ee ee eee ee ee ee ee ek ee ek ee ee ee ek ee ee Page 20 2 2 5 Composite Input ConneCtOF ie eek se sek ee Ee ee Ee Ee eee
3. 54dB relative to 100 AM Both measured average peak unweighted in a 10Hz to 20kHz bandwidth with pre emphasis applied in the Exciter but with no de emphasis on the measuring equipment which is used as an AM demodulator only The rated performance is maintained from maximum to at least half rate output power Mono AES Input except when Stereo Encoder S option is fitted see section 1 3 2 DC to 100kHz analogue mono input via 3 pole XLR connector Input impedance internally preset to balanced 6000 or 20kQ or unbalanced 6000 or 13 3kQ Input sensitivity for 75kHz deviation at 400Hz 8dBm 600Q input 8dBu 5 5V peak to peak adjustable from rear panel with maximum sensitivity typically 2dBu 1 8V Pre emphasis internally preset to none 25uS 50uS or 75uS continued on next page Print Date 06 06 11 Page 11 of 42 E2170 00MA 04 Mono AES Input except when Stereo Encoder S option is fitted see section 1 3 2 continued from previous page Overall frequency response better than 0 4dB over 5Hz 15kHz rel 1kKHz Measured with deviation set to 18dB below 75kHz 9 4kHz at 400Hz modulation fixed test level to pre emphasised input then causing deviation to rise with modulation frequency Overall harmonic distortion better than 60dB 0 1 over 40Hz to10kHz typ 66dB Measured in a bandwidth of twice the fundamental to 22KHz Overall signal to noise ratios better
4. Front Panel control and monitoring of the Exciter is via a two way serial data link to the hardware control microprocessor on the Main Board section 1 1 2 Print Date 06 06 11 Page 5 of 42 E2170 00MA 04 1 1 2 Main and Input Output Boards The Main Board contains all the basic baseband input circuitry Composite MPX RDS SCA and Mono the modulator and associated frequency synthesiser the main hardware control and monitor microprocessor and all connections to other boards modules and options within the Exciter The associated Input Output Board connects to a socket on the Main Board and carries all the parallel and RS232 serial control and monitoring connections to a 25 way D socket and a 9 way D plug respectively on the rear panel This Board provides protection and filtering for all these input output circuits as well as the open collector output transistors for the parallel status output connections All the baseband inputs to the Main Board via the rear panel connectors are summed together before being applied to the direct frequency modulator i e modulation is directly applied to the 87 5 to 108MHz oscillator The RDS SCA inputs are all unbalanced and have 75Q or 10kQ input impedance setting options The Mono signal has balanced 600 or 13 3kQ and unbalanced 600 or 20kQ setting options The Composite input has balanced 75Q or 13 3kQ and unbalanced 75Q or 20kQ setting options The options are set using links
5. MHz the clear channel the output will remain muted Press MAIN to confirm operating channel and frequency Print Date 06 06 11 Page 29 of 42 E2170 00MA 04 2 3 5 External Channel and Frequency Selection and Locking Channels 2 7 not channel 1 may be selected externally by connecting the appropriate pin on the 25 way rear panel Status connector SK12 to ground see section 2 2 13 CHANNEL 25 way pin number 1 None 2 1 3 2 4 3 5 4 6 5 7 6 GROUND 14 15 18 19 A momentary grounding of greater than one second will select a channel However if the ground is maintained the Exciter will remain locked to that channel and frequency and selection of another as described in section 2 3 4 will not be possible until that ground is removed This technique can be used to prevent unauthorised frequency changes being made from the front panel or remotely The display for that channel number will indicate ext selected whilst its external line is grounded going back to int selected when the ground is removed 2 3 6 Stereo Encoder Settings S option only The settings of the Stereo Encoder when fitted pre emphasis off 25uS 50uS 75uS limiter on off clipper on off and pilot on off may be viewed and altered from the front panel To view or change any of these press MODE on the front panel keyboard then the soft key under Options and finally the left hand
6. 2 15 inc only Note none W indicates that the channel has no stored frequency blank Selecting a blank channel will cause the Exciter power output to be muted Note that the contents of the frequency entry channel 0 are also sent with any stored channel frequency being reverted Print Date 06 06 11 Page 34 of 42 E2170 00MA 04 Reverted Analogue 1 Data Block 15 extra bytes reverted in response to W sequence Title Status Possible Values ASCII Ana1_Datat Analogue 1 request byte third byte echo fixed at W Anai_Data2 Deviation MSB kHz Ana1_Data3 Deviation MSB 1 KHz Anai_Data4 Deviation LSB kHz Null blank Ana1 Data5 Deviation MSB percent Ana1 Data6 Deviation MSB 1 percent Ana1 Data7 Deviation LSB percent 0 to 9 inc or X Ana1 Data8 Temperature MSB deg C Null blank Ana1 Data9 Temperature MSB 1 deg C 0 to 9 inc Anai_Data10_ Temperature LSB deg C and or X Anai_Data11 Current MSB Amps Null blank Anai_Data12__ Current MSB 1 Amps 0 to 9 inc Ana1_Data13 Current LSB 1 Amps lt d pt or X Anai_Data14_ Current LSB Amps Ana1 Data15 Spare Anai_Data16 Analogue 1 status 8 bit EOR checksum of 2 15 inc only Reverted Analogue 2 Data Block 15 extra bytes reverted in response to X sequence Ana2_Data10 Received signal level
7. If not follow fuse checking procedure as detailed in section 2 3 1 fault finding may be required if this occurs Check that the LCD display settles showing the MAIN screen which gives selected channel frequency forward and reverse output powers both near zero because of interlock and deviation bargraph again near zero showing internal pilot if present Set the Exciter s front panel POWER twenty two turn control to fully anti clockwise i e minimum power setting Ensure that any connections to the Status Connector SK12 Channel select input pins 1 6 are not grounded as this may prevent channels from being loaded with new frequencies The channel frequencies of the Exciters are set by pressing MODE on the front panel keyboard then the soft key under Freq then the left hand A and v keys as required to obtain the Channel 0 new freq entry display Channel 0 is a special channel only used to enter frequencies it cannot be selected for transmission If the frequency in any channel number display shows MHz this indicates a clear entry or channel With Channel 0 selected the four soft key switches set 10MHz 1MHz 100kHz and 10kHz in order from left to right below the LCD display 10MHz settings are limited to 8 9 and 10 any other will produce a cleared channel The 10kHz setting is only OkHz or 50kHz The new frequency should generally be selected in 10MHz 1MHz 100kHz 10kHz
8. clipping the deviation at about ZOKHz A switching multliplexer is used to convert the processed left right audio into a standard composite mpx signal which is further filtered and amplified before being fed to the Main Board The 38kHz sub carrier switching signal and 19kHz pilot tone are generated by a digital Walsh function generator a sample of the 19kHz being made available at the rear panel PILOT O P connector Note that the 19kHz pilot in the composite mpx output only can be switched on or off from the Front Panel or remotely and that a warning is issued if the pilot fails A microprocessor on the Encoder Module provides all control and monitoring of the hardware on the board It also interfaces via a serial data link with the hardware control microprocessor on the Main Board RS485 bus section 1 1 2 Encoder control settings made from the front panel or remotely are sent from the Main Board and then after being stored for use in the Encoder Board microprocessor reverted for display on the Front Panel or again remotely along with other Encoder status information Print Date 06 06 11 Page 8 of 42 E2170 00MA 04 1 1 6 Composite Input Module M Module only This optional module provides an additional Composite MPX input which is selectable from the Exciter front panel or remotely when two optional modules are fitted see sections 1 1 5 and 1 1 7 This input is in addition to the standard Composite input SKO9 w
9. 10 2 2 5 Composite Input Connector This is a floating 75Q BNC coaxial socket SKO9 at the lower rear of the unit used for interconnection to a composite multiplex modulating signal in the range from DC up to 100kHz A 50 or 75Q BNC plug can be used for connection to this input with matching screened coaxial cable not exceeding three metres in length The input can be internally preset to balanced 75 or 20kQ coaxial screen floating or unbalanced 75 or 13 3kQ coaxial screen internally grounded with its sensitivity set using the adjacent rear panel control see E2170 00GA Input sensitivity for 67 5kHz deviation excluding pilot 8dBu 5 5V peak to peak maximum sensitivity approximately 4dBu 3 5V peak to peak Print Date 06 06 11 Page 20 of 42 E2170 00MA 04 2 2 6 Composite Output Connector and Loop Switch This is a 75Q BNC coaxial socket SK10 at the lower rear of the unit used for interconnection to external equipment typically for RDS insertion after which it is routed back to the Exciter s Composite Input Connector see 2 2 5 and thence to the modulator In this situation the rear panel Loop switch SWO1 must be in the lower Ext position A 50Q or 75Q BNC plug can be used for connection to this output with matching screened coaxial cable not exceeding three metres in length This output can only be sourced from an optionally fitted module which has a composite mpx output such as the S Stereo Enco
10. 3 7 can similarly be checked and selected by replacing 2 in the above sequences with 1 or 3 7 as required Selecting a blank channel for transmission will cause the Exciter power output to be muted To re program a channel with a new frequency the new frequency must first be loaded into channel 0 similar to local operation as described in steps 8 13 of section 2 3 3 The sequence is as follows loading 92 70MHZ in this example Command Operation ASCIl 9 Set Channel 0 10MHz frequency to 9 52 Set Channel 0 1MHz frequency to 2 lt 7 Set Channel 0 100kHz frequency to 7 0 Set Channel 0 10kHz frequency to 0 Note that if the first command is W then channel 0 is cleared or blanked and the sequence terminated although a confirming echo will be sent in this case This blank channel 0 can then be used later to clear or blank other channels Note also that attempts to load frequencies outside the range 87 5 to 108MHz will produce no confirming echo and abort the sequence To re program a channel with the frequency previously loaded into channel 0 the sequence is as follows channel 4 in this example Command Operation ASCII gt 4 Set for channel 4 gt G Load channel 4 with channel 0 frequency Note that if channel 4 is already selected for transmission i e is on air then the second of the above commands will not send a confirming echo and the seq
11. Date 06 06 11 Page 23 of 42 E2170 00MA 04 2 2 14 External Standard Input Connector This is a 50Q BNC coaxial socket SK13 at the lower rear of the unit used for interconnection to a 10MHz external frequency standard typically derived from the GPS system A 50Q BNC plug is used for connection to this 50Q input with matching screened coaxial cable not exceeding three metres in length Connection to a source of 10MHz 10Hz at a level of between 3dBm 300mV rms pd and 13dBm 1V rms pd sinewave will cause the internal frequency standard to be phase locked to the external source The Exciter output frequency will be accurate and as displayed when the external source is precisely 10MHz The status of the external standard input function can be viewed by pressing MODE on the front panel keyboard then the soft key under System then the left hand A and v keys as required to obtain the Ext Standard status display which indicates None no standard present of sufficient level Normal standard present and in lock Fail standard present but not locked 2 2 15 Composite Input Connector M Composite Input option only This is a floating 75Q BNC coaxial socket on the rear of the optional module used for interconnection to a composite multiplex modulating signal in the range from DC up to 100kHz A 50Q or 75Q BNC plug can be used for connection to this input with matching screened coaxial cable not ex
12. Details of the Handshake Command Status Request and Control bytes are given in the following four tables Typical examples of controller generated sequences are as follows 1 Request to revert the frequencies of Channel 1and 0 Q Switches Stereo Encoder pilot on R Switches Stereo Encoder limiter off 5 Select Stereo Encoder 50uS pre emphasis Note that the Encoder commands are only operative and send confirming echoes if the Exciter being controlled has a Stereo Encoder fitted Similarly Option Set 1 or 2 commands are only valid if two options are fitted Note also that the channel or frequency control commands do not operate in isolation but instead must be performed in a defined sequence similar to that when using the local front panel controls This is to prevent unwanted or incorrect changes to the Exciter transmitted output frequency Errors in sequences will result in no confirming echo being returned and the sequence being aborted see section 2 4 4 Handshake first byte sent from controller Title Function Hex ASCII Async Hshake Remote input handshake 23 Print Date 06 06 11 Page 31 of 42 E2170 00MA 04 Remote Input Commands second byte sent from controller Title Function Hex ASCII Query_Status
13. Exciter is then fixed to the front of the racking using four screws plastic cup washers and caged nuts Print Date 06 06 11 Page 18 of 42 E2170 00MA 04 2 2 EXTERNAL CONECTIONS All permanent external connections are made at the rear of the unit in accordance with system requirements The connections required are made as described in the following sub sections 2 2 1 Mains Supply Connector This is a standard IEC connector PLO3 at the right rear of the unit intended for connection to a single phase plus protective earth supply The input is protected by a 20mm 6 3A T HBC fuse fitted in a carrier in PLOS CAUTION Certain variants have a rear panel on off switch in line with this connector see section 1 2 Note that this switch interrupts the Neutral supply line only For the XE35 the supply is in the range 100 260VAC 47 63Hz with no setting required The maximum current drawn from the supply is in the order of 1 4A at 100V to 0 5A at 260V at 35W RF output For the XE75 the supply is also in the range 100 260VAC 47 63Hz with no setting required The maximum current drawn from the supply is in the order of 2A at 100V to 0 8A at 260V at 75W RF output For the XE150 the supply is in the range 100 260VAC 47 63Hz with no setting required The maximum current drawn from the supply is in the order of 3A at 100V to 1 2A at 260V at 150W RF output For the XE300 the supply is also in the range 100 260VAC 4
14. Print Date 06 06 11 Page 40 of 42 E2170 00MA 04 3 2 5 METER Display Mode If Meter mode is selected pressing the A or v keys steps through various system status levels forward and reverse power heatsink temperature amplifier current high and low voltages etc Levels are shown simultaneously in horizontal bargraph form and as actual digital values Values are shown in real time apart from the digital display of deviation which captures and then holds the peak level of deviation for a period of approximately 1 to 2 seconds This level is shown both in kHz and in percentage of 75kHz The bargraph display of deviation remains real time with no peak hold Note that when Meter mode is entered directly after checking a specific status in System mode which has a variable level such as heatsink temperature then the first Meter mode display will be of that level see section 3 2 3 This allows rapid checking of any system status faults discovered 3 2 6 FREQ Display Mode If Frequency mode is selected pressing the A or v keys steps through the contents of the eight channel frequency stores In this mode the frequencies stored can also be altered and different channels selected for transmission see sections 2 3 3 4 5 by pressing the soft keys as marked below the LCD Note that channel 0 is solely for the entry of new frequencies in the range 87 5 to 108MHz they cannot be directly entere
15. XE75 150W XE150 or 300W XE300 in the standard Band II frequency range of 87 5 108MHz They are capable of generating a standard mono or stereo FM signal from a variety of analogue or digital audio or data sources including left right audio MPX RDS SCA DARC etc It is important to note that the Exciter options supplied will depend on the user s actual requirements in this regard which therefore must be clearly specified at time of ordering The Exciters are totally self contained including forced air cooling and can be mounted within a standard 19 inch rack with at least 520mm depth and 2U height All that is required is a connection to a mains supply to source s of modulation and to an antenna or to an amplifier such as the Eddystone Broadcast S7600 or S7900 Series if greater output power is required Remote control and monitoring of the Exciter can be by serial RS232 or TCP IP connection internal preset link using asynchronous data Basic parallel control and monitoring is also provided Two optional modules normally of different types can be fitted in any Exciter apart from those with the rear panel supply switch see section 1 2 when only one can be fitted These modules generally have input output connections available on the rear panel of the Exciter The Exciter will recognise any such module fitted and provide the appropriate control automatically on a Plug and Play basis One example is a Stereo Encoder module whi
16. equipment typically RDS generators which generate a sub carrier which requires phase locking to harmonics of the Stereo Encoder 19kHz pilot tone 57kHz in the case of RDS An SMA plug is used for connection to this output with matching screened coaxial cable not exceeding three metres in length The output is approximately 100Q at a level of 5V peak to peak sinewave open circuit 2 2 12 COM Port Connector This is a 9 Way D plug PL11 on the rear panel This enables all the control and monitoring detailed in Section 2 4 to be performed using a personal computer with its RS232 COM port connected to this port Multi core screened cable not exceeding 30 metres in length should be used for the interconnecting lead The lead terminates in a 9 Way free D socket at the Exciter end which is wired as follows Pin 1 Not connected Pin 2 Received Data to Exciter Pin 3 Transmit Data from Exciter Pin 4 Not Connected Pin 5 Ground Pin 6 Not Connected Pin 7 Not Connected Pin 8 Not Connected Pin 9 Not Connected Note that the assigned pin numbers and their functions are for a standard 9 pin plug on Data Terminal Equipment DTE such as computers Standard crossover or null modem leads must thus be used for connection to a personal computer or PC The length of the interconnecting lead may be extended by use of compatible RS422 485 or fibre optic line drivers Note th
17. frequency LSB 1 100kHz 0 9 W or X Op_Data11 Output frequency LSB 10kHz 0 5 W or X Op_Data12 Exciter OS number MSB 0 to 9 inc and Op Data13 Exciter OS number MSB 1 decimal point Op_Data14 Exciter OS number LSB Op_Data15 Exciter type 35W 75W amp 150W 300W or X Op Data16 Output data 8 bit EOR checksum of 2 15 inc only Note none W indicates a blank channel has been selected causing the Exciter power output to be muted Reverted Channel Data Block 15 extra bytes reverted in response to 1 to 7 sequences Title Function Possible Values ASCII Chan_Data1 Channel number 1 7 third byte echo of 1 7 Chan Data2 Channel frequency MSB 10MHz 8 9 0 10 W or X Chan_Data3 Channel frequency MSB 1 1MHz 0 9 W or X Chan_Data4 Channel frequency LSB 1 100kHz 0 9 W or X Chan_Data5 Channel frequency LSB 10kHz 05W orX Chan_Data6 Channel selection state DIVX Chan_Data7 On Air Channel number 1 7 or X Chan Data8 Channel 0 frequency MSB 10MHz 8 9 0 10 W Chan_Data9 Channel 0 frequency MSB 1 1MHz 0 9 and W Chan_Data10 Channel 0 frequency LSB 1 100kHz 0 9 and W Chan_Data11 Channel 0 frequency LSB 10kHz 0 5 and W Chan_Data12 Channel data spare Chan_Data13 Channel data spare Chan_Data14 Channel data spare Chan_Data15 Channel data spare Chan_Data16 Channel data 8 bit EOR checksum of
18. inputs The Front Panel RF MON output can be used to check the close in spectrum of the Exciter output signal noting that any harmonic levels shown will not necessarily be the same as those present at the Exciter output The Front Panel BASEBAND MON output can similarly be used to check the spectrum of the final modulating signal Any test equipment should not however normally be left connected to these two outputs 2 3 4 Channel and Frequency Selection and Setting During Operation Channel frequencies may be loaded or altered whilst the Exciter is operating delivering output power as detailed in section 2 3 3 steps 8 to 11 The frequency of the channel on which the Exciter is operating however cannot be altered this channel frequency display showing int selected or ext selected see step 10 To change the operating channel press MODE on the front panel keyboard then the soft key under Freq then the left hand A and v keys as required to obtain the channel and frequency required and finally the soft key below Select note Select will not appear on special channel 0 or on the channel already selected Note also the comments in section 2 3 5 about locked channels The front panel SYSTEM NORMAL LED will show red until the new frequency is in lock this taking several seconds After a total of about 12 seconds RF will be output at the new frequency However if the frequency is
19. mains supply switch space for one optional module only E2170 06 Basic XE300 300W Exciter with rear mains supply switch space for one optional module only E2170 07 Basic XE35 35W Exciter with rear mains supply switch space for one optional module only E2170 08 Basic XE75 75W Exciter with rear mains supply switch space for one optional module only M Fitted with MPX Composite Input Module R Fitted with Re Broadcast Receiver IS Fitted with Analogue AES EBU Input Stereo Encoder Print Date 06 06 11 Page 9 of 42 E2170 00MA 04 1 3 TECHNICAL SPECIFICATIONS The XE35 75150 300 Series of FM Exciters is designed to meet or exceed ETSI Standards EN 301 489 01 ERM EMC for Radio Equipment Part 1 Common Technical Requirements EN 301 489 11 ERM EMC for Radio Equipment Part 11 Special Conditions for FM Transmitters EN 302 018 02 ERM Spectral Occupancy for the FM Radio Broadcast Services EN 60215 1989 Safety Requirements for Radio Transmitting Equipment Overall performance is specified with the RF output demodulated using a high quality FM AM demodulator and a high quality stereo or mono decoder Audio and composite mpx test sources also exceed the rated Exciter performance by at least 10dB or equivalent The normal stereo signal generated by the Exciter or source consists of 75kHz maximum deviation due to a mono signal 67 5kHz maximum deviation due to left right
20. on the Main Board All these inputs have separate input level setting controls adjustable via access holes on the rear panel Additionally the Mono signal input can have 25 50 75uS or no pre emphasis applied this again being set using links on the Main Board There is also a Composite output on the rear panel with 75Q output impedance This only provides an output from an optional module which generates a composite mpx signal from an input to that module the Stereo Encoder S option or the MPX Composite M option for example This internally generated signal can be directed to the input summer to modulate the Exciter directly by having the rear panel Loop switch in the upper Int position With the switch in the lower EXt position the internally generated signal is normally taken out of the Composite output and directed via external units Such as an RDS generator back into the Exciter s main Composite input The direct frequency modulator uses a low microphony transmission line resonator in a low noise transistor oscillator circuit DC coupling of the audio modulating signals right through to the final modulating varicap diodes gives optimum frequency response and stereo separation over the whole audio range Extra tuning varicap diodes controlled by dc voltages derived from an output frequency software based look up table give high linearity and near constant deviation sensitivity over the whole output frequency range
21. order as each digit entry will zero any lesser significant digits and or determine their allowable range Only settings between 87 5 and 108MHz will be selectable 10 The channel frequencies seven total are stored in non volatile flash memory and are thus retained whilst power is removed To load the frequency entered in Channel 0 into one of the seven stored channels press the left hand and v keys as required to obtain the destination Channel number display The presently selected channel for transmission will indicate int selected or ext selected the other six will indicate stored frequency as well as Select and Update above the extreme left and right hand soft keys 11 The frequency in channel 0 can only be loaded into one of the six channels by pressing the soft key below Update The seventh presently selected channel cannot be over written with a new frequency To do this first select another channel for transmission by pressing the Print Date 06 06 11 Page 28 of 42 E2170 00MA 04 soft key below Select when its screen is displayed This will free the previously transmitted channel for a frequency update note the comments in section 2 3 5 about locked channels 12 It is recommended that if only one frequency is required then that frequency should be loaded into all seven channels If required however a channel can be cleared by updating it with rae
22. stereo signals less in both cases if RDS and or SCA signals are also generated 6 75kHz deviation due to 19kHz pilot tone stereo signals only giving a total maximum of approximately 75kHz Unless otherwise specified overall performance is specified at the above deviation levels with 8dBu 5 5V peak to peak test signal s Pre emphasis is applied in the Exciter or test source and de emphasis applied in the measuring equipment Any other Exciter signal processing circuitry e g limiters clippers etc is switched off 1 3 1 Common Specifications RF Output Port 50Q nominal N Type Connector Carrier Frequency 87 5 108MHz in 50kHz steps with seven stored channels in programmable non volatile flash memory The channels can be programmed and selected locally and remotely Frequency change time approximately 15secs RF output muted during change period Performance equal to or better than Stability 2ppm maximum over 5 to 50deg C 200Hz at 150MHZ Ageing 1ppm over first year 150Hz at 150MHz Adjustment 3ppm using internal trimmer 5ppm using voltage trimmer Variation 2ppm with 75kHz deviation applied 200Hz at 150MHZ Under normal operating and maintenance conditions the resulting frequency error should be less than 200Hz typically less than 150Hz Output Power With any load with a return loss gt 14dB 1 5 1 VSWR any angle XE35 Adjustable over range of at least 20W to 35W XE75 Adj
23. than RMS A weighted 75dB RMS CCIR468 3 weighted 65dB RMS unweighted 70dB Q Peak CCIR468 3 weighted 65dB Q Peak CCIR unweighted 65dB All measured relative to deviation of 75kHz and 400Hz modulation set up with an RMS unweighted measurement Composite MPX Input stereo source DC to 100kHz input via floating 75Q BNC connector Input impedance internally preset to balanced 75Q or 20kQ coaxial screen floating or unbalanced 75Q or 13 3kQ coaxial screen internally grounded Input sensitivity for 67 5kHz deviation exc pilot 8dBu 5 5V peak to peak adjustable from rear panel with maximum sensitivity typically 4dBu 3 5V Overall frequency response better than 0 2dB over 5Hz 15kHz rel 1kKHz Measured with deviation excluding pilot set to 18dB below 67 5kHz 8 4kHz at 400Hz modulation fixed test level to pre emphasised test source then causing deviation to rise with modulation frequency Overall stereo separation better than 48dB over 40Hz to 10kHz typ 55dB Overall harmonic distortion better than 60dB 0 1 over 40Hz to 10kHz typ 66dB Measured in a bandwidth of twice the fundamental to 22KHz Overall signal to noise ratios better than RMS A weighted 75dB RMS CCIR468 3 weighted 65dB RMS unweighted 70dB Q Peak CCIR468 3 weighted 65dB Q Peak CCIR unweighted 65dB All measured relative to deviation of 67 5kHz excluding pilot and 400Hz modulation set up with an
24. 0 9 Freq_100k_0 9 Set channel 0 100kHz Frequency 30 39 0 9 Freq_10k_0 5 Set channel 0 10kHz Frequency 30 35 05 Channel_No_1 7 Set chan number for update select 31 37 1 7 Channel_Up Update channel with channel 0 freq 47 G Channel_ Sel Select channel for transmission 49 Pre_Emph_Off Set Stereo Encoder pre emphasis off 52 R Pre_Emph_25 Set Stereo Encoder pre emphasis 25uS 32 2 Pre_Emph_50 Set Stereo Encoder pre emphasis 50uS 35 5 Pre Emph 75 Set Stereo Encoder pre emphasis 75uS 37 7 Pilot On Set Stereo Encoder 19kHz pilot on 51 Q Pilot_Off Set Stereo Encoder 19kHz pilot off 52 R Limiter On Set Stereo Encoder limiter on 51 Q Limiter_ Off Set Stereo Encoder limiter off 52 R Clipper On Set Stereo Encoder clipper on 51 Q Clipper_Off Set Stereo Encoder clipper off 52 R Option_1 Select Option 1 MPX output 31 1 Option_2 Select Option 2 MPX output 32 2 Note Setting channel 0 10MHz frequency to none W will blank the whole of channel 0 enabling other channels to be blanked later Print Date 06 06 11 Page 32 of 42 E2170 00MA 04 24 3 Reverted Status Monitor Information The status of the Exciter is reverted in response to a command see section 2 4 2 After the third byte is echoed back to the remote control unit a further fifteen bytes are sent immediately from the Exciter with no delays between individual bytes each 1 start 8 data 1stop no parity The first fourteen of the fifteen bytes contains the specific st
25. 00 pulled to gnd when good Pin 10 PLL Lock status output pulled to ground when good Pin 11 Heatsink Temperature status output pulled to ground when good i e lt 85deg C Pin 12 Modulation Deviation status output pulled to ground when good i e lt 80kHz Pin 13 System Normal status output pulled to ground when good Pin 14 Chassis Ground for Channel select input Pin 15 Chassis Ground for Channel select input Pin 16 Forward power analogue monitor voltage output 0 5V into gt 1kQ approx 0 8V at 35W 1 3V at 75W 2V at 150W and 3V at 300W as applicable Pin 17 Reverse power analogue monitor voltage output 0 5V into gt 1kQ approx 0 2V at 4W 0 4V at 8W 0 7V at 15W and 1V at 30W as applicable Pin 18 Chassis Ground for Channel select input Pin 19 Chassis Ground for Channel select input Pin 20 Chassis Ground Pin 21 Safety Interlock input ground to de mute Pin 22 Mute RF input ground to mute for control not safety purposes Pin 23 12v dc fused supply output 150mA maximum Pin 24 CPU status output pulled to ground when Main Board CPU good Pin 25 Fan status output pulled to ground when good Any of the pulled to ground when good status outputs required to be used must be returned to a supply of no greater than 25V and must be limited to drawing no more than 50mA each by additional external resistance 1
26. 00Q is provided internally All of the ground to operate inputs except pin 21 the safety interlock are internally pulled up to 5V via 12kQ and must be fed from a voltage free source of less than 1kQ to ground to operate open circuit for a high non operating state These inputs are protected against constant application of up to 25V dc directly applied For the safety interlock a circuit has to be made between pins 20 and 21 which open circuits to mute the Exciter or short circuits to de mute If there are no external safety interlock switches a short direct link is made this being the state in which any connector is normally supplied If connections need to be made to external safety switches this link is removed and the switches are wired in a series loop to the connector so that if any switch opens the link is broken Note that the safety interlock provides the most direct and thus safest muting of output power The Mute RF input pin 22 ground to mute is read by software with a short delay and thus is not so direct being intended for control purposes only and not as part of a safety interlock system CAUTION For the safety interlocks to work correctly the external switches and link wiring must float i e must not be grounded at any point apart from at the Exciter itself The total loop resistance should not exceed approximately 10Q The external wiring may also be ferrite loaded for emc requirements Print
27. 7 63Hz with no setting required The maximum current drawn from the supply is in the order of 6A at 100V to 2 4A at 260V at 300W RF output The mains supply lead to the Exciter must use at least 10A rated three core P N protective earth insulated cable A double pole 10A C rated MCB must be provided at the supply distribution board prefered or a 10A HBC fuse in the associated plug at the supply outlet to protect this lead Also since the supply input circuitry contains a filter which passes current to the Exciter chassis the chassis must be connected to a safety ground via the earthing bolt provided adjacent to the mains supply input connector The supply lead terminates in a 10A C13 IEC free socket at the Exciter end which is wired as follows L or Brown Line N or Blue Neutral Lor Protective Green Yellow Earth Care MUST be taken to connect these leads to the supply as detailed in the above table If a lead with different coloured wires is used further advice MUST be taken Also ensure whilst making any connections to the mains supply that the Amplifier s rear panel interlock circuit at SK12 pins 20 and 21 is open circuit i e Exciter muted 2 2 2 RF Output Connector CAUTION When operating high RF Voltages are present on this connector Always ensure when making connections here or working on any load connected that the Exciter s mains supply is either disconnected or switched to off
28. A and v keys as required to display the function setting required To alter a setting press the appropriately marked soft key and after a brief delay the revised setting will be displayed and stored in non volatile flash memory and thus retained whilst power is removed Press MAIN to return to operating channel frequency power and deviation display Note that the limiter should normally be switched on if the clipper is in operation The limiter operates at a lower deviation level than the clipper It thus prevents the possibility of excessive distortion occurring if the clipper operates on high non limited levels of modulation rather than just the short transient peaks of modulation resulting from the finite attack time of the limiter circuit Print Date 06 06 11 Page 30 of 42 E2170 00MA 04 2 4 SERIAL REMOTE CONTROL AND MONITORING 2 4 1 Introduction Serial control via the rear panel COM PORT connector section 2 2 12 uses asynchronous data 1 start 8 data 1 stop bit no parity at 2400 4800 9600 or 19200 Baud Control commands and status monitor requests are detailed in section 2 4 2 The content of status monitor information reverted from the Exciter is detailed in section 2 4 3 The same functions are also enabled using TCP IP via a rear panel RJ45 connector section 2 2 7 Selection of COM port or RJ45 connector is made using an internal link lead The individual data bytes are defined in ASCII form to enable basic c
29. Connectors S Stereo Encoder version only These are two three pin XLR sockets at the rear of the unit fitted to the rear of the S Stereo Encoder module used for interconnection to stereophonic modulating signal or monophonic using a single input Twin separately screened cables not exceeding three metres in length should be used for the interconnecting leads Each lead terminates in a three pin XLR plug at the Exciter end which is wired as follows Pin 1 Direct chassis ground or Chassis ground via 150n 50V capacitor Pin 2 Signal Pin 3 Signal The input impedance can be set internally to balanced 600 or 20kQ with pin 1 either connected directly to chassis ground or via a capacitor see E2170 00GA The input sensitivity of each input is set separately using the adjacent rear panel controls with pre emphasis set from the front panel to none 25uS 50uS or 75uS Input sensitivity for 67 5kKHz deviation exc pilot at 400Hz 8dBm 600Q input 8dBu 5 5V p to p maximum sensitivity approximately 4dBm 600Q input 4dBu 1 4 peak to peak Note that each input can be made unbalanced by externally connecting one of the balanced signal input lines to ground pin 2 or pin 3 to pin 1 The input impedance then becomes 6002 or 13 3kQ 2 2 11 Pilot Output Connector S Stereo Encoder version only This is a 500 SMA coaxial socket SK14 at the rear of the unit used for interconnection to external
30. Eddystone Broadcast XE35 75 150 300 Series 35 300W FM Exciters Series 3 Installation and Operation Issue 4 E2170 00MA 04 June 2011 Eddystone Broadcast Ltd 26 Arden Rd Arden Forest Industrial Estate Alcester Warwickshire B49 6EP England Tel 44 0 1789 762278 Fax 44 0 1789 766033 www eddystone broadcast com Print Date 06 06 11 Page 1 of 42 E2170 00MA 04 Intentional blank page Print Date 06 06 11 Page 2 of 42 E2170 00MA 04 Index SECTION ONE INTRODUCTION 1 1 GENERAL DESCRIPTION se Ge ee Ee ie ia ie aa OE Re di ES ee eee ee Page 5 1 1 1 Front Panel Module iss e se ee ee eee eee ee ee ee ee ee ee ee a ee ee ee ee ee ee Page 5 1 1 2 Main and Input Output BoardS iese se ee sek ee ee cece eee ee ek ee ek ee Re eats ea ee ee ee ee Page 6 1 1 3 35 75 150 300W Amplifier Module Control and Power Supply isi sesse sesse Page 7 1 1 4 12V Supply and Fan Control Board iese ee se ee se cece eee ke ek ee ee ee ee ee ee ee ee ee Page 8 1 1 5 Stereo Encoder Module S option only ee ee se ee se ee ee ee ee RR ee ee ek ee ek ee Page 8 1 1 6 Composite Input Module M Module only iese ie sek ee ek ee ke ee Ee ee ee ee ee ee eek ede Page 9 1 1 7 Re Broadcast Receiver Module R option only ke ee RE ee ee ee ke ee ge ee ee Page 9 1 2 VARIANTS AND OPTIONS ets ske RE Res sae eg Ede SEEKOS Eie Eyk eg vee dedi be Des gs ok See Page 9 1 3 TECHNICAL SPECIFICATIONS
31. Ex Data11 Exciter heatsink cooling fan status NFZ X Ex_Data12 Exciter Deviation NLH X Ex_Data13 Exciter Ext Mute State MSX Ex_Data14 Exciter Interlock State MSX Ex_Data15 Spare Ex_Data16 Exciter status 8 bit EOR checksum of 2 15 inc only Note Ex Data2 Exciter system normal will indicate not normal O if any of Ex Data3 11do not indicate normal N none W or not applicable Z Ex_Data2 is not affected by Ex Data12 15 Reverted Options Data Block 15 extra bytes reverted in response to Z sequence Title Status Possible Values ASCII Opt_Data1 Options status request byte third byte echo fixed at Z Opt_Data2 Stereo Encoder pre emphasis 2 25uS 5 50uS 7 75uS R X Z Opt_Data3 Stereo Encoder 19kHz pilot RQXZ Opt_Data4 Stereo Encoder limiter RQX2Z Opt_Data5 Stereo Encoder clipper RQXZ Opt Data6 Stereo Encoder 19kHz pilot status NF X Z Opt_Data7 Stereo Encoder AES signal status NWX Z Opt_Data8 Spare Opt_Data9 Receiver signal status NL X Z Opt_Data10 Spare Opt Data11 Spare Opt_Data12 Spare Opt_Data13 Option 1 Type WX 123 Opt_Data14 Option 2 Type WX123 Opt_Data15 Option 1 or 2 Selected 12 XI Opt_Data16 Options status 8 bit EOR checksum of 2 15 inc only Note not applicable Z indicates that the option is not fitted Note Z in this case means two options not fitted 1 Composi
32. MHz from channel 0 If selected for transmission a cleared channel will produce a muted output although the Exciter will rest at 98MHZ 13 If not already selected select the channel required for transmission by pressing the soft key below Select when its screen is displayed The display will show int selected Press MAIN to return to the main screen which will show the selected channel and its frequency 14 Reconnect the rear panel Interlock connection between pins 20 and 21 of SK12 15 Turn the Front Panel POWER control clockwise to increase the selected Exciter s output power until the required Fwd power is obtained as indicated on the LCD display The displayed Rev power depends on the return loss of the load presented to the Exciter s RF output but should generally be less than one twentieth of the Fwd To ensure complete accuracy an external calibrated power meter should be used to measure the Fwd output power The Exciter will now be ready for operation with audio and or data sources applied to the rear panel inputs the instantaneous deviation being displayed on the main screen bargraph Input levels or the corresponding rear panel sensitivity controls may need adjusting to obtain the required deviation Note that when the S Stereo Encoder option is fitted its Limiter and Clipper functions on or off will affect the deviation levels obtained from the Left Right or digital AES
33. MSB dBm Title Status Possible Values ASCII Ana2_Data1 Analogue 2 request byte third byte echo fixed at X Ana2_Data2 High voltage MSB Volts Ana2_Data3 High voltage MSB 1 Volts Ana2_Data4 High voltage LSB 1 Volts Ana2_Data5 High voltage LSB Volts Ana2_Data6 Low voltage MSB Volts Null blank Ana2_Data7 Low voltage MSB 1 Volts 0 to 9 inc Ana2_Data8 Low voltage LSB 1 Volts TA Ana2_Data9 Low voltage LSB Volts me point Ana2 Datal1 Received signal level MSB 1 dBm dBm dBm Ana2 Data12 Received signal level LSB 1 dBm Ana2 Data13 Received signal level LSB dBm Ana2_Data14_ Spare Ana2_Data15 Spare Ana2_Data16 Analogue 2 status 8 bit EOR checksum of 2 15 inc only Print Date 06 06 11 Page 35 of 42 E2170 00MA 04 Reverted Exciter Data Block 15 extra bytes reverted in response to Y seguence Title Status Possible Values ASCII Ex_Data1 Exciter data status request byte third byte echo fixed at Y Ex_Data2 Exciter system normal status NOX Ex_Data3 Exciter forward power status NLFX Ex_Data4 Exciter reverse power status NHX Ex_Data5 Exciter heatsink temperature NHX Ex_Data6 Exciter power amplifier current status N H X Ex_Data7 Exciter high voltage status NLX Ex_Data8 Exciter low voltage status NLX Ex_Data9 Exciter phase lock status NFX Ex_Data10 Exciter external standard status NFWX
34. R unweighted 65dB All measured relative to deviation of 67 5kHz excluding pilot and 400Hz modulation set up with an RMS unweighted measurement Print Date 06 06 11 Page 15 of 42 E2170 00MA 04 1 3 4 Re Broadcast Receiver Module Specifications R option only RF Input rejection and selectivity measured with mono signal Single preset frequency within range 87 5 to 108MHz via rear panel 50Q N Type coaxial connector frequency must be specified at time of ordering Operating input level approximately 80dBm to at least 20dBm Ultimate signal to noise ratio reached at approximately 55dBm Image rejection an unwanted modulated signal at 21 4MHz below the wanted signal frequency and of level OdBm will generate a final output equivalent to a signal at the wanted frequency of level lower than approximately 90dBm I F rejection an unwanted modulated signal at 10 7MHz and of level OdBm will generate a final output equivalent to a signal at the wanted frequency of level lower than approximately 90dBm Adjacent channel selectivity with a wanted signal modulated at 400HZz to give 75kHz deviation and of a level to give 60dB signal to noise ratio RMS A weighted typically 80dBm the relative levels of an unmodulated unwanted signal at various offsets required to produce a 6dB drop in signal to noise ratios are as follows At 500kHz unwanted level typically greater than 55dB relative to
35. RMS unweighted measurement RDS SCA Inputs 57kHz to 100kHz inputs 3 total via 75Q BNC connectors Input impedances individually internally preset to unbalanced 75Q or 10kQ Input sensitivity for 2 0kHz deviation typical RDS 1V peak to peak Input sensitivity for 5 5kHz deviation typical SCA 2 8V peak to peak each input separately adjustable from rear panel with maximum sensitivities of approximately 500mV and 1 4V peak to peak respectively Composite MPX Output DC to 100kHz output via 75Q BNC connector Output impedance unbalanced 75Q Output level for 75kHz total deviation 5 5V peak to peak open circuit matches Composite MPX Input sensitivity for looping through zero gain external equipment loop switch on Ext all input impedances high Note that this output is only provided from optionally fitted modules which have a Composite MPX output such as the S option Stereo Encoder Performance of this output essentially matches that of the source module Print Date 06 06 11 Page 12 of 42 E2170 00MA 04 Status Indications Four line by 20 character back lit LCD display with selectable screens showing output frequency forward and reverse power and instantaneous deviation level individual system normal status components settings of any optional modules fitted comprehensive bargraph and digital readout metering of analogue levels including peak hold and kHz percentage displays of
36. Status query request to revert 3F Freg Set 10M Channel 0 10MHz freq 0 8 9 none 3A Freg Set 1M Channel 0 1MHz frequency 0 9 3B f Freg Set 100k Channel 0 100kHz frequency 0 9 3C lt Freq Set 10k Channel 0 10kHz frequency 0 or 5 3D Channel Set Channel 1 7 update or select 3E gt Pre_Emph_Set Encoder pre emphasis off 25 50 75uS 27 Pilot_Set Encoder 19kHz pilot on or off 28 Limiter_Set Encoder limiter on or off 29 Clipper_Set Encoder clipper on or off 2A Option_Set Select Option 1 or 2 2B Remote Input Status Requests third byte sent from controller after command Title Function Hex ASCII Op_Stat Revert output and type status 30 0 Chan1 Stat Revert channels 1 and 0 freguencies 31 1 Chan2_Stat Revert channels 2 and 0 frequencies 32 2 Chan3_ Stat Revert channels 3 and 0 frequencies 33 3 Chan4_Stat Revert channels 4 and 0 frequencies 34 4 Chan5_ Stat Revert channels 5 and 0 frequencies 35 5 Chan6 Stat Revert channels 6 and 0 frequencies 36 6 Chan7_Stat Revert channels 7 and 0 frequencies 37 7 Ana1 Stat Revert deviation temperature current 57 W Ana2 Stat Revert high low voltages signal level 58 X Sys_Stat Revert Exciter status 59 Y Opt Stat Revert Options status 5A Z Remote Input Controls third byte sent from controller after lt gt commands Title Function Hex ASCII Freq_10M_ Set channel 0 10MHz Frequency 38 39 89 8 9 10 W 30 10 0 or 57 or W Freg 1M 0 9 Set channel 0 1MHz Frequency 30 39
37. The output of the modulator is harmonically filtered buffered and amplified to provide a low level drive for the 35 75 150 300W Amplifier Module section 1 1 3 The output frequency of the Exciter is set by a phase lock loop controlled by the Main Board microprocessor The loop filter output controls the main tuning varicap diodes of the oscillator This filter has two software switched time constants A very long time constant is selected when the loop is settled in its normal modulating mode optimising low frequency audio performance A much shorter time constant is temporarily selected when the frequency is being changed to ensure frequency changes can be made in a relatively short period Whilst such changes are being made or if the loop is out of lock for any other reason the low level drive from the Main Board and the 35 75 150 300W Amplifier are both muted The output frequency is locked to a highly stable 12 8MHz Temperature Controlled Crystal Oscillator TCXO on the board If required this TCXO can be separately locked to an external 10MHz standard This is done using a second phase lock loop again controlled by the Main Board microprocessor Locking to the external standard happens automatically if a signal of the correct frequency and level is applied to the rear panel External Standard input The microprocessor on the Main Board provides all control and monitoring of the hardware on the board including analogue to digital conversio
38. Z 6002 SW2 LK2 Left Channel Ground AC capacitor or DC direct DC SW3 LK3 Right Channel Input Impedance 6009 or High Z 600Q SW4 LK4 Right Channel Ground AC capacitor or DC direct DC The M Composite Input Board option switches links are as follows Switch Link Function Default Factory Setting SW1 LK1 Input Type Balanced or Unbalanced Balanced SW2 LK2_ Input Impedance 75Q or High Z High Z The Main Board option switches links are as follows Switch Link Function Default Factory Setting SW2 MONO AES Input Function Mono or AES Mono or AES S option SW3 MONO AES Input Function Mono or AES Mono or AES S option SWa MONO Input Type Balanced or Unbalanced Balanced SW5 MONO Input Impedance 600Q or High Z 6009 SW6 SCA3 Input Impedance 75Q or High Z High Z 10kQ SW7 MONO Input Pre emphasis 50uS or Off 50uS Ssws MONO Input Pre emphasis 25uS or Off Off SW9 SCA2 Input Impedance 75 or High Z High Z 10kQ SW10 SCA1 RDS Input Impedance 759 or High Z High Z 10k SW11 Composite Input Type Balanced or Unbalanced Unbalanced SW12 Composite Input Impedance 75Q or High Z High Z Note SW2 and SW3 These links are only set to AES when the S Stereo Encoder option module is fitted Note SW7 and SW8 To select 75uS pre emphasis set these links to 50uS and 25uS respectively To select p
39. ak left and right separately adjustable from rear panel with maximum sensitivities typically 4dBu 1 4V Pre emphasis set from front panel or remotely to none 25uS 50uS or 75uS Overall frequency response better than 0 4dB over 30Hz 15kHz rel 1kKHz integral lowpass filters provide greater than 60dB rejection at 19kHz Measured with deviation excluding pilot set to 18dB below 67 5kHz 8 4kHz at 400Hz modulation fixed test level to pre emphasised input then causing deviation to rise with modulation frequency Overall stereo separation better than 48dB over 40Hz to 10kHz typ 60dB Overall harmonic distortion better than 58dB 0 13 over 40Hz to 10kHz typ 64dB Measured in a bandwidth of twice the fundamental to 22kHz Overall signal to noise ratios Overall signal to noise ratios better than RMS A weighted 70dB RMS CCIR468 3 weighted 58dB RMS unweighted 65dB Q Peak CCIR468 3 weighted 58dB Q Peak CCIR unweighted 58dB All measured relative to deviation of 67 5kHz excluding pilot and 400Hz modulation set up with an RMS unweighted measurement Pilot Tone Output and Deviation 19kHz 2Hz output via 50Q SMA connector Pilot deviation 6 75kHz adjustable from the rear panel over at least 6kHz to 7 5kHz Output Impedance approximately 100Q Output level approximately 5V peak to peak sinewave open circuit 38kHz Sub carrier Suppression Better than 40dB relative
40. at an internal lead connection determines if serial control and monitoring is via this RS232 connector or via the rear panel TCP IP connector SK04 see 2 2 7 For RS232 control the 3 pin screened lead from the Front Panel board connector 6 CONO5 must be plugged into the Input Output Board connector 14 CONO3 see E2170 00CT Print Date 06 06 11 Page 22 of 42 E2170 00MA 04 2 2 13 Status Connector This is a 25 Way D socket SK12 at the rear of the unit This is used to enable basic external monitoring and control Multi core screened cable not exceeding 3 metres in length should be used for the interconnecting lead The lead terminates in a 25 Way free D plug at the Amplifier end which is wired as follows Pin 1 Channel 2 select input momentary ground for gt 1second to select Only one Pin 2 Channel 3 select input momentary ground for gt 1second to select input Pin 3 Channel 4 select input momentary ground for gt 1second to select grounded Pin 4 Channel 5 select input momentary ground for gt 1second to select at a time Pin 5 Channel 6 select input momentary ground for gt 1second to select will be Pin 6 Channel 7 select input momentary ground for gt 1second to select recognised Pin 7 Forward Power Low approx 2dB rel set o p pulled to ground when good Pin 8 Fwd Power Fail approx 12dB rel max o p pulled to ground when good Pin 9 Rev Power High ap 15W XE35 75 30W XE150 3
41. at the distribution board preferably being locked in that position This is an N Type coaxial socket SK15 at the rear of the unit Care must be taken to use adequately rated at maximum ambient temperature low loss cable for the lead to the antenna amplifier or load Print Date 06 06 11 Page 19 of 42 E2170 00MA 04 2 2 3 SCA1 RDS SCA2 and SCA3 Input Connectors These are 75Q BNC type coaxial sockets SK08 SK07 and SKO6 at the lower rear of the unit used for interconnection to RDS Radio Data System and or SCA Subsidiary Carrier Authority modulating signals in the range 57 to 100kHz 50 or 75Q BNC plugs can be used for connections to these inputs with matching screened coaxial cable not exceeding three metres in length Each individual input can be internally set to unbalanced 75Q or 10kQ see E2170 00GA with its sensitivity set using the adjacent rear panel controls Input sensitivity for 2 0kHz deviation typical RDS 1V peak to peak 500mV at maximum sensitivity Input sensitivity for 5 5kHz deviation typical SCA 2 8V peak to peak 1 4V at maximum sensitivity Note that all three inputs are functionally identical however SK08 is marked RDS SCA1 to aid connection to sources the input designated for RDS may also typically be set for a higher sensitivity than inputs used for SCA sources 2 2 4 Mono AES Input Connector This is a three pin XLR socket SKO5 at the lower rear of the unit used for interconnection to a monophon
42. atus information requested The last byte is an exclusive OR checksum of those fourteen bytes This checksum can be used by the remote control unit to check that the information has not become corrupted The meanings of the various bytes in the information string are defined in the table below Reverted Status Information meanings of bytes reverted in response to command Title Meaning Hex ASCII Norm Status normal 4E N N Norm Status not normal AF O Stat Low Status low 4C L Stat_High Status high 48 H Fail Status fail 46 F Off Status off 52 R On Status on 51 Q Mute Status muted 4D M Start Status start 53 S De Sel Status de selected 44 D Int_Sel Status internally selected 49 Ext_Sel Status externally selected 56 V None None 57 W N Known Not known 58 X N_Applic Not applicable 5A Z Direct Display Numerical values 30 39 0 9 Direct Display Sign 2B 2D Direct Display Decimal point 2E Direct Display Blank 00 NUL Direct Display Less than 3C lt Direct Display Greater than 3E gt Most meanings are general A string of fourteen system status information bytes would typically contain several N s each one indicating that a particular status forward power reverse power etc is Normal Direct display bytes give an immediate numerical display of power current and temperature etc even when using a basic terminal program If th
43. ceeding three metres in length The input can be internally preset to balanced 75 or 20kQ coaxial screen floating or unbalanced 75 or 13 3kQ coaxial screen internally grounded with its sensitivity set using the adjacent rear panel control see E2170 00GA Input sensitivity for 67 5kHz deviation excluding pilot 8dBu 5 5V peak to peak maximum sensitivity approximately 4dBu 3 5V peak to peak NOTE that this connector must not be used for the input from an external loop originating from the Composite Output Connector SK10 SKO9 must be used in this circumstance as detailed in sections 2 2 5 and 2 2 6 2 2 16 Antenna Input Connector R Re Broadcast option only This is a 50Q N type coaxial socket on the rear of the optional module used for interconnection to a Band Il receiving antenna 87 5 to108MHz possibly via intermediate amplifiers splitters etc A 50Q N type plug is used for connection to this input with matching low loss RF coaxial cable Operating input level approximately 80dBm to at least 20dBm Print Date 06 06 11 Page 24 of 42 E2170 00MA 04 2 3 SETTING UP PROCEDURES 2 3 1 Fuses If any problems occur after the Exciter has been installed and switched on fuses may need to be checked and possibly replaced However a blown or high impedance fuse would generally indicate the presence of a fault which would need correcting The type function and access to fuses is as follows Ty
44. ch encodes left right analogue or digital AES EBU inputs into a stereo composite MPX signal which can modulate the Exciter The Exciter consists of a number of modules described as follows 1 1 1 7 inc Front and rear views block and circuit diagrams showing these modules are bound at the rear of this manual E2170 00GA E2170 00BK and E2170 00CT 1 1 1 Front Panel Module The Front Panel module provides all local control and monitoring of the Exciter functions It also enables this control and monitoring to be performed remotely via an RS232 or TCP IP serial interface The module is microprocessor based with a back illuminated high contrast 4 line by 20 character display and separate MOD ulation SYSTEM NORMAL and MUTE red green indicators A robust sealed membrane keypad is provided with a sounder to indicate correct key entry A connection is provided from the module to RS232 and TCP IP monitor control ports on the rear of the Exciter Selection of TCP IP or RS232 is done by connection to the Main or Input Output Board respectively The Front Panel module also has a preset control SET POWER adjustable via an access hole in the front panel for setting the Exciter output power level Connectors providing samples of the composite mpx baseband modulating signal and of the final RF output signal are provided adjacent to the preset control for temporary connection to external monitoring equipment BASEBAND RF MON
45. cket is provided for cable screen grounding either directly or through a capacitor internal option link The AES EBU digital input is via the dual purpose MONO AES socket this standard mono input normally being re directed to the digital input of the Encoder Board when that board is fitted The digital input is balanced transformer coupled with an input impedance of approximately 110Q These three inputs have separate input level setting controls adjustable via access holes on the rear panel of the Encoder Module Selection of the digital input is made automatically when a valid AES EBU signal is detected by the serial input receiver In this circumstance the analogue left right inputs are disconnected and the left right analogue outputs of the dual D A converter fed by the digital receiver are routed through to the following filtering amplifying and signal processing stages in their place When no valid digital input is present the input selection defaults to the left right analogue input The selected input signal in left right analogue form is fed through pre emphasis limiter and clipper circuits in turn The first circuit applies 25 50 or 75uS or no pre emphasis as selected via the Front Panel or remotely The limiter and clipper circuits can also be similarly and independently selected on or off The limiter provides automatic gain control limiting the peak deviation to approximately 55kHz the clipper provides a soft clipping action
46. d heatsink cooling fan This system normal indication corresponds with the front panel SYSTEM NORMAL LED green for Normal red for Not Normal If this LED goes red System mode should be selected and the status es causing the warning should be determined by pressing the A or v keys to check them individually Note that this LED will also go red during power on reset or during frequency changes whilst the phase lock loop is temporarily out of lock not a fault On all System mode selections the display also shows the front panel software operating system number as X X in the top right hand corner 3 2 4 OPTIONS Display Mode If Options mode is selected initially the options fitted if any will be displayed along with the maximum power level of the amplifier section 35W 75W 150W or 300W If options are fitted 1 or 2 the type s will be displayed Enc Stereo Encoder Comp additional Composite MPX Input RBR Receiver If two options are fitted the output of the option required to modulate the Exciter can be selected if only one option is fitted the Exciter will remain fixed to its Composite MPX output If an option is fitted pressing the A or v keys steps through any statuses pertaining to that option Certain option statuses can be set from the front panel by pressing the soft keys as marked below the LCD e g the pre emphasis setting of the Stereo Encoder see section 2 3 6
47. d into any other channel The channel 0 setting can then be transferred into any of channel 1 to 7 that is displayed as having a stored frequency i e one that is not presently selected for transmission The channel selected for transmission is displayed as ext selected when it has been selected by one of the external channel lines being held low channels 2 to 6 only see section 2 3 5 Otherwise it is displayed as int selected i e selected from the front panel or remotely or by one of the external channel lines which is no longer being held low Any of channels 1 to 7 can be selected for transmission unless the presently selected channel is displayed as ext selected holding an external channel select line low locks the Exciter onto that channel to prevent unauthorised changes to output frequency Print Date 06 06 11 Page 41 of 42 E2170 00MA 04 Intentional blank page 000 Print Date 06 06 11 Page 42 of 42 E2170 00MA 04
48. der It cannot be sourced from the composite mpx signal directly applied to the modulator within the Exciter When the composite mpx signal from the optionally fitted module is to be routed directly to the modulator the rear panel Loop switch SW01 must be in the upper Int position This is the normal mode of operation The output is unbalanced 75Q at a level for 75kHz deviation of 5 5V peak to peak open circuit This matches the input sensitivity of the Exciter s Composite Input Connector see 2 2 5 when the external equipment has nominally OdB insertion gain and all input impedances external equipment and Exciter s Composite input are set to high 2 2 7 TCP IP Connector This is an RJ45 connector SKO4 fitted at the rear of the unit This enables all the control and monitoring detailed in Section 2 4 to be performed using TCP IP Transmission Control Internet Protocol This arrangement requires the unit to be assigned a unique Internet Protocol address When first connected to the network via its RJ 45 connector the Exciter s TCP IP adapter will attempt to acquire an IP address automatically its quite common to have networks configured to use DHCP which provides these addresses on demand The address to which a device has been assigned can then be determined and if required be overridden with a desired fixed value using Eddystone supplied software Note that an internal lead connection determines if serial co
49. deviation frequency settings and status of all seven channels Red green off led indicators of modulation level system normal status and mute status Red green pass fail led indicators of Amplifier Module output forward and reverse power heatsink temperature dc supply current and CPU status Local Control Eight key sealed membrane keypad including main and mode screen dedicated keys two cursor keys and four soft keys Remote Control and Monitoring RS232 or TCP IP preset internal link setting using 2400 4800 9600 or 19200 Baud asynchronous data 1 start 8 data 2 stop no parity rate selectable from front panel All local control and monitoring is duplicated over the serial link RS232 on nine way D plug TCP IP on RJ45 socket Basic parallel control monitoring including a safety interlock and analogue output voltage levels indicating forward and reverse output power on 25 way D socket Baseband and RF monitoring BNC outputs on front panel Environmental Ambient Temperature operating 5 to 50 deg C Ambient Temperature storage 20 to 70 deg C Relative Humidity operating Less than or equal to 95 non condensing with the Exciter at a higher temperature than the ambient Altitude operating Up to 3000 metres a s l Mechanical Width 483mm 19 in Height 88mm 2U Depth 520mm Weight Approx 15kg Notes depths are intrusion into rack including cabling at the
50. e Exciter contains no known good information about a particular status the X byte is reverted This occurs if the Exciter is unable to interrogate individual modules within the unit and thus cannot determine their status The Revert Output Status Request ASCII 0 returns the Exciter type and can be used by the Remote Control Unit to determine the power rating of the Exciter being interrogated The following six tables detail the contents of the various strings of reverted status information The final column in each defines which ASCII values a particular byte can have The table above defines the meanings of these values The first byte in each table is the echo of the third byte sent from the remote control unit Print Date 06 06 11 Page 33 of 42 E2170 00MA 04 Reverted Output Data Block 15 extra bytes reverted in response to 0 sequence Title Status Possible Values ASCII Op_Datat Output data status request byte third byte echo fixed at 0 Op_Data2 Output forward power MSB Watts Op_Data3 Output forward power MSB 1 Watts Null blank Op_Data4 Output forward power LSB Watts 0 to 9 inc Op Data5 Output reverse power MSB Watts lt less than Op Data6 Output reverse power MSB 1 Watts or X Op Data7 Output reverse power LSB Watts Op Data8 Output frequency MSB 10MHz 8 9 0 10 W or X Op_Data9 Output frequency MSB 1 1MHz 0 9 W or X Op Data10 Output
51. ee ee ede Page 40 3 2 4 OPTIONS Display Mode iese se ee ee ee se ee Re ee ee ee RR ee ee ee ee ee ek ee ek ee eek ee ee Re ee Page 40 3 2 5 METER Display Mode eie ese dese see eee ee ee ee ee se nen EN ee a ee Ee ee E Re ee ee ee ee ee ee Page 41 3 2 6 FREQ Display Mode us verset kis Bee E ed oe oe hes RR la sek SEDES Rok Pe EP eke oe De ee de Ke vas Page 41 Front and Rear VieWS iese ek ek dee ke ee ke ee Ke Ke Re ee ease ee ee E2170 00GA Block BI Pl AE EE EE EE RE N E2170 00BK Inter Connections Circuit DiagraM iese se ee se ee ee Re ee E2170 00CT Print Date 06 06 11 Page 4 of 42 E2170 00MA 04 SECTION ONE INTRODUCTION CAUTION These Exciters operate at high RF power levels internal supply energy levels and mains supply current levels They also incorporate devices containing toxic BeO Installation operation and maintenance of this unit must therefore only be carried out by suitably qualified personnel familiar with and fully utilising the safety procedures such equipment demands NO attempt at installation should be made without full reference to and compliance with SECTION TWO INSTALLATION NO attempt at internal maintenance should be made without full reference to and compliance with the appropriate sections fuse changing and internal option links which are detailed in INSTALLATION 1 1 GENERAL DESCRIPTION The XE35 75 150 300 Series of FM Exciters provide output powers of up to 35W XE35 75W
52. ee ee ee ee ee ek ee ee ek ee eke ee Page 20 2 2 6 Composite Output Connector and Loop SwitCh iii eie se ee Ee ee Ke Re ek ee ee Page 21 2 2 1 TGP IP GONNEGTOF ses ies caches n GEES nase tat SERS RE OD EE thous KEER ER EG ES RE Ek tuned Page 21 2 2 8 Baseband Monitor ConnectOF iese eek ee se ee eek ee ee eee ee ee ee eee ee ee ek ee ek ee ee ee ee Page 21 22 9 RF veeleer se GER EE N RE EE EE RE TEE aa Page 21 2 2 10 Left and Right Audio Input Connectors S Stereo Encoder option only Page 22 2 2 11 Pilot Output Connector S Stereo Encoder option only eie ee ee ee se ee ee ees Page 22 22 12 COM Port GOnne Ctl vist EE fens cs ieee GE EE EA ES eee tena teagan BA RE Ge Ee KERE BEK SE BERE Pe We Page 22 2 2 13 Status CONNECT ERA el DEE LE EE GEREG GREG EG EE GER TE GE Re RE De ee Eg GRA DE ER EG Page 23 2 2 14 External Standard Input ConnectOF iese ee see ee ke eects ee ek tees ee ee ee ee ek ee ee ee Page 24 2 2 15 Composite Connector M Composite Input option only eek se ee ee ee ee Page 24 2 2 16 Antenna Input Connector R Re Broadcast option only see se ee ke ke ee Page 24 2 3 SETTING UP PROCEDURES hasien sesde se see ee se ee see ee eek ee ede ee eee ee ede ee ee de ee ee ee ee Page 25 2S A FUSES si EA EE OE RE OE AE E OR N Page 25 2 3 2 Internal Option LINKS 2 25 EE EE EER GEE EE IG Ge EE OE SR De BAR ENE EG ER BE PER ea EP GR Ge de as Page 26 2 3 3 Output Frequency and Power Level Adjustment
53. fered in the mode selected Unmarked Membrane To select various choices offered in the mode selected Soft keys Switches Unmarked 20 Character by 4 Indicates present mode middle of top line with status input Display line LCD back parameters etc and next key operation choices below illuminated by green LEDs O Rocker Switch To switch mains supply on I or off O on rear panel E2170 05 06 07 and 08 variants Note an internal sounder indicates correct membrane switch key operation by a single beep or an invalid key input by a short series of beeps Print Date 06 06 11 Page 39 of 42 E2170 00MA 04 3 2 STATUS PERFORMANGE AND LEVEL MONITORING Once installed as described in Section 2 most operations only involve monitoring Exciter status performance and levels etc The membrane switches grouped around the LCD display are used to select which parameter s to monitor the results being displayed on the LCD The displays are grouped into modes as follows Note that a display indicates that a particular status cannot be monitored by the Exciter s microcontroller a permanent display of indicates a fault 3 2 1 MAIN Display Mode To display the Exciter s selected on air channel frequency and forward and reverse power press MAIN No matter what state the Exciter is in pressing this key will always display these main Exciter parameters An instantaneous but u
54. front of the power supply unit and behind the front panel This fuse will automatically reset if the Fan is momentarily disconnected or if the mains supply to the Exciter is interrupted 1 4A Hold SMD 200 2 Resettable Fuse For protection of all circuitry supplied by the internal 12V dc supply If this fuse goes high impedance virtually all Exciter operation ceases apart from the fan Access to this fuse is not normally required This smd fuse is fitted on the narrow printed circuit board Fan Control Board immediately in front of the power supply unit and behind the front panel This fuse will automatically reset if the mains supply to the Exciter is interrupted Print Date 06 06 11 Page 25 of 42 E2170 00MA 04 Type Function Access ended Fuse If this fuse blows the output power will reduce to zero 1 CAUTION This fuse is soldered to its retaining clips and is intended to blow only if there is a major power supply failure This fuse should thus only be replaced when the fault 1A F Fuse For protection of Driver Amplifier Remove top dust cover Fuse is fitted in for smd holders circuitry a surface mounted holder on the printed Littelfuse circuit board mounted at the rear of the R451501 If fuse blows there will be a main heatsink immediately in front of substantial reduction in output the fan power CAUTION Ensure that the mains supply is e
55. he Front Panel or remotely This board further provides the 15A fused supply to the 35 75 150 300W Amplifier Module and the fused supply for the amplifier fan The 15A fuse is soldered in and is intended to protect the Amplifier module only if there is a major power supply fault The fan operates at 20V XE35 24V XE75 and XE150 or 48V XE300 and thus there is a factory set link on the board set according to the input supply to generate the correct fan supply The fan supply return lead is feed through a current detector circuit on this board which signals any low fan current state to the Main Board microprocessor 1 1 5 Stereo Encoder Module S option only This optional module converts either left right analogue or AES EBU digital stereo signal inputs to a standard composite mpx signal which can be used to modulate the Exciter It also has switchable pre emphasis limiting and clipping functions and a rear panel output of the 19kHz pilot generated by the module These inputs are selectable from the Exciter front panel or remotely in the situation where two optional modules are fitted see sections 1 1 6 and 1 1 7 The inputs to the module are via rear panel XLR sockets The balanced left right analogue inputs are on the Encoder Module itself with internal option links to set 600Q or 20kQ input impedance These inputs may also be externally wired for unbalanced operation the input impedance then being 600 or 13 3kQ A third pin on each so
56. he optional module sockets both have a Composite MPX output connection from the module which is directed to a relay which can be set to select which of the two possible module outputs is directed to the rear panel Composite output connector and Loop switch and hence back to the modulator 1 1 3 35 75 150 300W Amplifier Module Control and Power Supply The 35 75 150 300W Amplifier Module is fitted on a fan cooled heatsink which runs between the front and rear panels To reduce ingress of dust nearly all of the forced air is directed over the heatsink fins with only a small bleed of air over components mounted on the heatsink surface itself The Module can provide at least 35W 75W 150W or 300W output from the low level drive from the Main Board using single ended driver and push pull output Mosfets This output device is an integrated 50Q gain block consisting of a dual RF Mosfet transistor with matching sections at its input and output This pallet is mounted on an aluminium block and is easily replaced as a unit if required The maximum output power level is determined by the Power Supply fitted 20V for the XE35 28V for the 75W 36V for 150W 48V for 300W The output power level is set by the bias voltage applied to the output Mosfet by the Control Board A range of approximately 20W to 35W XE35 25W to 75W XE75 25W to 150W XE150 or 30W to 300W XE300 is provided The Amplifier Module also contains an output lo
57. hich is permanently connected The input to the module is via a rear panel floating 75Q BNC socket Internal option links are provided to set balanced 75Q or 13 3kQ input impedance or unbalanced 75Q or 20kQ This input has a separate input level setting control adjustable via an access hole on the rear panel of the Composite Input Module adjacent to the connector The input signal is fed through a buffer circuit before being directed to the Main Board The signal is also fed to a signal level detector and a 19kHz pilot detector on the Composite Board itself These circuits provide a DC analogue level corresponding to the Composite input level and an indication that a 19kHz tone is present with the input signal A microprocessor on the Composite Input Module provides all control and monitoring of the hardware on the board It also interfaces via a serial data link with the hardware control microprocessor on the Main Board RS485 bus section 1 1 2 1 1 7 Re Broadcast Receiver Module R option only This optional module demodulates a wideband FM input RF signal in the range 87 5 to 108MHz to provide a mono composite MPX baseband signal which can be used to modulate the Exciter i e re broadcast This input is selectable from the Exciter front panel or remotely when two optional modules are fitted see sections 1 1 5 and 1 1 6 The input to the module is via a rear panel 50Q N Type socket This input is passed through a pre t
58. ic modulating signal or when the S Stereo Encoder option is fitted for interconnection to a digital AES EBU stereo mono modulating signal Single or twin screened cable not exceeding three metres in length should be used for the interconnecting lead The lead terminates in a three pin XLR plug at the Exciter end which is wired as follows Mono S option not fitted AES S option fitted Pin 1 Chassis ground via 10n 50V capacitor Pin 2 Signal Signal Pin 3 Signal balanced or Signal Chassis ground unbalanced On Mono S option not fitted the input impedance can be set internally to balanced 600 or 20kQ or unbalanced 600Q or 13 3kQ The input sensitivity is set using the adjacent rear panel control with pre emphasis internally preset to none 25uS 50uS or 75uS see E2170 00GA Input sensitivity for 75kHz deviation at 400Hz 8dBm 6000 input 8dBu 5 5V peak to peak maximum sensitivity approximately 2dBm 600Q input 2dBu 1 8V peak to peak On AES S option fitted the input is floating transformer coupled with a 150n 50V DC blocking capacitor protecting the primary The in band input impedance is set to 1109 Digital Input sensitivity is set by the AES LVL control on the rear panel of the S Stereo Encoder module not by the control adjacent to the Mono AES socket Phase of the signal connections is not significant Pre emphasis is set as for the left right analogue inputs see 2 2
59. ither disconnected or is switched to off at the distribution board preferably being locked in that position 15A T HBC For protection of the output and Remove top dust cover Fuse is 6 3x32mm driver amplifier circuitry soldered to clips on the narrow printed Pig Tail wire circuit board Fan Control Board attached to the side of the Power Supply Unit immediately to the rear of the Front Panel CAUTION Ensure that the mains supply is either disconnected or is switched to off at the distribution board preferably being locked in that position has been investigated and corrected 2 3 2 Internal Option Links The option links are detailed on diagram E2170 00GA bound at the rear The links are either physically removable two position shorting types LK or miniature changeover switches SW A further option link cable is also fitted see E2170 00CT to determine the remote control interface TCP IP or RS232 The links are found at the rear of the Main Board the rear of the S Stereo Encoder Board and the rear of the M Composite Input Board The cable link when fitted connects from the Front Panel Board to the rear of the Main Board or to the Input Output Board To access all of these the top dust cover has to be removed CAUTION Ensure that the Exciter s mains supply is either disconnected or switched to off at the distribution board preferably being locked in that positi
60. l power fallen more than approximately 9 12dB below that required Green indicates normal operation REV P A LED Display Red indicates reverse power to Exciter in excess of approx 15W on XE35 75 7dB 75W 3 7dB 35W or 30W on XE150 300 10dB 300W 7dB 150W Green indicates normal operation TEMP P A LED Display Red indicates Exciter amplifier heatsink temperature greater than approximately 85 deg C Green indicates normal operation CURRENT P A LED Display Red indicates current to Amplifier Pallet in excess of approx 7A on XE35 75 or 11A on XE150 300 Green indicates normal operation CPU P A LED Display Red indicates amplifier module CPU microcontroller failure other P A LED displays will automatically be turned off Green indicates normal CPU operation CONTRAST Preset 1T To set the contrast of Exciter s liquid crystal display LCD for Potentiometer best contrast in the prevailing viewing and ambient temperature conditions MAIN Membrane Switch To directly select the main LCD screen showing the Exciter s operating channel and frequency output forward power reverse power and the instantaneous deviation MODE Membrane Switch To select other Exciter functions modes such as system status and meter monitoring channel frequencies and any option settings and status A Membrane Switch To step upwards through choices offered in the mode selected v Membrane Switch To step downwards through choices of
61. l conversion of forward reverse power heatsink temperature amplifier current and set power level It also interfaces via a serial data link with the hardware control microprocessor on the Main Board RS485 bus section 1 1 2 Digitised versions of all the mentioned levels and various fault conditions low power power fail etc are sent to the Main Board and then onwards for display on the Front Panel or remotely A separate hardware watchdog circuit monitors the running of the microprocessor s program and provides a Front Panel PA CPU led warning if the program fails to run and puts the adjacent PA FWD REV TEMP and CURRENT leds all off their indications would be invalid in this circumstance The Power Supplies are a universal input switched mode designs with a power rating and output voltage dependent on the maximum output power from the Exciter Their single outputs are fed to the 12V Supply and Fan Control Board section 1 1 4 Print Date 06 06 11 Page 7 of 42 E2170 00MA 04 1 1 4 12V Supply and Fan Control Board This board contains a 20W DC DC converter which provides a regulated 12V dc supply from the main Power Supply The 12V supply is further processed and regulated to provide 5V 22V and 12V at point of delivery The board also provides accurately tapped outputs from the input 20 48V line and output 12V line to feed the A D converter on the Main Board thus enabling a display of these voltage levels on t
62. n of power supply and modulation levels It also interfaces via serial data links with other hardware control microprocessors on the Amplifier Control Board and optional modules RS485 bus sections 1 1 3 1 1 5 1 1 6 and 1 1 7 and on the Front Panel module separate dedicated bus section 1 1 1 The seven channel frequencies and settings of any optional modules are stored in its non volatile flash memory A separate hardware watchdog circuit monitors the running of the microprocessor s program and provides warnings on board led to Front Panel and to rear panel output if the program fails to run Print Date 06 06 11 Page 6 of 42 E2170 00MA 04 and also automatically mutes the Exciter s output The microprocessor also generates a mute signal under various circumstances e g when the synthesiser is out of lock this signal being directed via the safety Interlock relay This relay will itself provide an over riding mute signal if the external Interlock line is open circuited irrespective of any internal Exciter condition Two sockets are provided on the Main Board for the connection of optional modules S Stereo Encoder etc The connections are standardised and the microprocessor will automatically recognise and provide appropriate control and monitoring of whatever module is fitted to whatever socket Plug and Play this also applying to the sockets for connection to the Front Panel and Amplifier Modules T
63. ncalibrated display of the deviation level in bargraph form is also provided in this mode to show modulation activity MAIN mode is the normal mode in which the Exciter is left to operate 3 2 2 MENU of Modes Display Mode To display other Exciter statuses levels etc press MODE then press the soft key beneath the LCD display corresponding to the group or mode required System Options Meter Freq An individual status or level within the selected group can then be displayed by pressing the A or v keys on the left hand side of the LCD display No matter what state the Exciter is in pressing MODE will always display the display mode menu 3 2 3 SYSTEM Display Mode If System mode is selected pressing the A or v keys steps through various system status conditions showing Normal Fail High Low None etc Statuses which also have a varying level e g forward and reverse power deviation etc can be further checked by going directly to Meter mode where the actual level status presently be checked will be immediately displayed see section 3 2 5 An overall SYSTEM Normal display is shown on all System mode selections this changing to SYSTEM Not Normal if any of the major individual statuses are not normal i e forward and reverse power heatsink temperature amplifier current high and low voltages phase lock external standard an
64. ntrol and monitoring is via this RJ45 connector or via the rear panel RS232 COM Port connector PL11 see 2 2 12 For TCP IP control the 3 pin screened lead from the Front Panel board connector 6JCONOS must be plugged into the Main Board connector 5 CONO7 see E2170 00CT 2 2 8 Baseband Monitor Connector This is a 50Q BNC coaxial socket SKO1at the left hand side of the Exciter front panel This provides a sample of the signal applied to the modulator within the Exciter The output is unbalanced 75Q at a level for 75kHz total deviation of 1 6V peak to peak pd across 75Q This connector is for test purpose only with the test equipment and lead being disconnected when not in use NOTE that the performance of this output noise distortion stereo separation etc is not necessarily equal to that of the modulated signal 2 2 9 RF Monitor Connector This is a 50Q BNC coaxial socket SKO2 on the left hand side of the Exciter front panel This provides an harmonically filtered sample of the Exciters forward output power at a level into 50Q approximately 44dB below the power being delivered into the load e g approximately 1mW to10mW at maximum power output This connector is for test purpose only with the test equipment and lead being disconnected when not in use NOTE that the levels of any harmonics present are not necessarily equal to those at the antenna Print Date 06 06 11 Page 21 of 42 E2170 00MA 04 2 2 10 Left and Right Audio Input
65. on before removing the top dust cover The S Stereo Encoder Board if fitted is then immediately accessible with the links just behind the Left and Right Inputs XLR connectors To access any Main Board links the Encoder Board must be removed two M3 screws holding Encoder Board sub chassis to the rear panel two M3 screws holding sub chassis to support rail across main Board connectors unplugged as required Similarly the M Composite Input Board if fitted is also immediately accessible with the links just behind the Inputs BNC connector To access any Main Board links the Composite Input Board must also be removed two M3 screws holding Composite Input Board sub chassis to the rear panel two M3 screws holding sub chassis to support rail across main Board connectors unplugged as required The R Re Broadcast Receiver Board has no links to set but if fitted will also need to be removed to access links on the Main Board Print Date 06 06 11 Page 26 of 42 E2170 00MA 04 To access most links on the Main Board the Input Output Board must be removed 4 screwlocks holding Status and COM Port connectors to rear panel one M3 screw holding Input output Board to support pillar on Main Board connectors unplugged as required The S Stereo Encoder Board option switches links are as follows Switch Link Function Default Factory Setting SW1 LK1_ Left Channel Input Impedance 600Q or High
66. ontrol and monitoring using a PC running a terminal program However a PC program with a dedicated textual and or graphical user interface is required for proper implementation of a remote control and monitoring system Eddystone Broadcast should be contacted for further information regarding such programs and hardware implementations using the RS232 and TCP IP ports directly or via USB or TCP IP adaptors 2 4 2 Control Commands and Status Monitor Requests All command and status monitor requests are initiated by the remote control unit PC the Exciter never outputs any serial data via the COM PORT or TCP IP connector unless requested to by that unit The remote control unit always sends a sequence of three bytes waiting for each byte to be echoed correctly before the next one is sent which must be within 500mS of the previous one A wait of 500mS is also recommended before the sequence is timed out and aborted A new sequence of three bytes then can be attempted Note that an echo will not be returned when an invalid sequence is detected by the Exciter The three bytes are First byte Handshake always ASCII indicates start of sequence Second byte Command indicates form of control or status monitoring Third byte Status Requests after ASCII Command gives details of status monitoring required or Controls after ASCII lt gt Commands gives details of control required
67. pe Function Access 6 3A T HBC 5x20mm Fuse For protection of ac supply input circuitry If this fuse blows all Exciter operation ceases FS1 at the right rear of the unit being part of mains input socket PLO3 CAUTION Ensure that the mains supply is either disconnected or is switched to off at the distribution board preferably being locked in that position 0 21A Hold SMD 030 2 Resettable Fuse For protection of the 12V dc output on the rear panel Status connector SK12 If this fuse goes high impedance any external equipment powered off this supply will cease operation Access to this fuse is not normally required smd fuse is fitted to the Input Output Board on which SK12 is located This fuse will automatically reset if the externally supplied equipment is momentarily disconnected or if the mains supply to the Exciter is interrupted 0 21A Hold SMD 030 2 Resettable Fuse XE35 75 150 or 0 35A Hold SMD 050 2 Resettable Fuse XE300 For protection of the rear panel fan and its supply leads If this fuse goes high impedance this fan will cease operation The Fan led will go red After a period the Output Amplifier temperature will increase and the output power eventually turn done with an over temperature indication Access to this fuse is not normally required This smd fuse is fitted on the narrow printed circuit board Fan Control Board immediately in
68. ption Function Quantity 1 BNC type 50Q or 75Q coaxial free For connection to Composite Input Composite plug s plus coaxial cable as req d Input M option only 1 N type 50 coaxial free plug plus For connection to Antenna Input Re coaxial cable as req d Broadcast R option only Length as Multi core screened cable number of Control monitor leads req d cores as required Length as Heavy gauge grounding wire strap For safety earth lead req d 4 Screws c w plastic cup washers and For fixing unit into19 inch rack rack caged nuts 2 Side support L brackets c w fixing For extra support to carry the Exciter s weight in the rack 1 6 3A T HBC 5x20mm Fuse For protection of ac supply input circuitry 1A F Fuses for smd holders Littelfuse R451 1500 For protection of driver amplifier within unit 15A T HBC 6 3x32mm Va x1 in Pig Tail wire ended Fuse For protection of output amplifier circuitry 2 1 2 Rack Mounting If the Exciter is not supplied ready mounted in a 19 inch rack this will be required to be done at time of installation The 19 inch rack should ideally be of standard 600mm depth and requires at least 2U height Additional height will be required if a second Exciter and or an Amplifier are to be fitted into the same rack Additional bottom support L brackets may also be required at each side below the Exciter to help carry its weight The
69. re insulated Mains supply lead for operation in up to 50 req d cable EPR insulated HOFR deg C ambients sheathed or 3 core 1 5mm per core insulated cable PVC insulated and sheathed 1 10A C rated 2 pole miniature circuit Fitted at mains supply distribution point to breaker MCB protect supply lead and mains input components in the Exciter 1 N type 50Q coaxial free plug For connection to RF output plus low loss RF coaxial cable as req d rated in excess of Exciter output power at maximum ambient temperature 1 5 BNC type 50Q or 75Q coaxial free For connection to Composite RDS SCA plug s plus coaxial cable as req d inputs and Composite output 1 BNC type 50 coaxial free plug For connection to External Standard input plus RF coaxial cable as req d 1 XLR 3 pin free plug For connection to Mono or on S option plus screened cable as req d AES audio input 1 9 Way D plug c w cover For connection to leads from serial RS232 control monitor ancillary equipment 1 25 Way D plug c w cover For connection to leads from parallel control monitor ancillary equipment 2 XLR 3 pin free plugs For connection to Left and Right Audio Stereo plus screened cable as req d inputs Encoder S option only 1 SMA free plug For connection to 19kKHz Pilot output Stereo plus coaxial cable as req d Encoder S option only Print Date 06 06 11 Page 17 of 42 E2170 00MA 04 screws and washers Typical Descri
70. re emphasis off set both these links to Off The cable link is as follows Remote Control Option Link Front Panel Connector 6 CONOS to Serial RS232 via COM Port PL11 Input Output Board Connector 14 CONO3 TCP IP via RJ45 Connector SK04 Main Board Connector 5 CONO7 Print Date 06 06 11 Page 27 of 42 E2170 00MA 04 2 3 3 Output Frequency and Power Level Adjustment If the Exciter is not supplied with preset frequency ies and output power level its frequency channel stores will need to be loaded and its front panel POWER control will need to be set If being used as a drive for an amplifier the manual for the amplifier must be consulted for information on the level of drive output power required and care must be taken that the maximum drive level for that amplifier is not exceeded The procedure is as follows 1 2 Ensure the Exciter has been installed as detailed in sections 2 1 and 2 2 and the internal option links are set as in 2 3 2 as required Break the rear panel Interlock connection between pins 20 and 21 of SK12 and ensure all external sources of modulation are switched off Apply power to the Exciter i e ensure the supply distribution 10A MCB if fitted is on and the rear panel switch if fitted is on Ensure that the power on audio tone sounds the LCD display illuminates briefly displaying Exciter type information and all LED displays except MOD are on red green or amber
71. rear Power Supply Single phase input on 10A IEC connector XE35 75 150 300 100 260VAC 47 63Hz Power factor meets EN61500 3 2 Peak inrush current 14A 28A at 100V 260VAC input XE35 1 4A at 100V to 0 5A at 260V at 35W RF output XE75 2A at 100V to 0 8A at 260V at 75W RF output XE150 3A at 100V to 1 2A at 260V at 150W RF output XE300 6A at 100V to 2 4A at 260V at 300W RF output Print Date 06 06 11 Page 13 of 42 E2170 00MA 04 1 3 2 Stereo Encoder Module Specifications S option only Mono AES Input Standard AES EBU serial digital stereo audio Input via 3 pole XLR connector Sensitivity adjustable from rear panel Input impedance 110Q floating balanced transformer isolated Note that a valid AES EBU signal at this input will take precedence over the left right analogue inputs to the Stereo Encoder module In this case the specified overall performance and the pre emphasis etc selected will also apply to the digital signal see below Left Right Inputs DC to 15kHz left right analogue stereo inputs via two 3 pole XLR connectors Note that a valid AES EBU signal at the Mono AES input will take precedence over these analogue inputs Input impedance internally preset to balanced 600 or 20kQ 600Q or 13 3kQ if externally unbalanced by grounding one balanced input side Input sensitivity for 67 5kHz deviation excluding pilot at 400Hz 8dBm 600Q input 8dBu 5 5V peak to pe
72. t up with an RMS unweighted measurement The signal to noise ratios deteriorate by approximately 10dB when the input signal falls to about 80dBm mono or 60dBm stereo Print Date 06 06 11 Page 16 of 42 E2170 00MA 04 SECTION TWO INSTALLATION CAUTION These Exciters operate at high RF power levels internal supply energy levels and mains supply current levels They also incorporate devices containing toxic BeO Before commencing installation it is recommended that the complete INSTALLATION section is read and understood The instructions should then be strictly followed by suitably qualified personnel otherwise sub standard or even dangerous operation may result 2 1 PHYSICAL DIMENSIONS AND FITTING 2 1 1 Installation Accessories Various installation accessories may be supplied as required A list of these including spare fuses is given below Actual requirements depend on the configuration of the equipment supplied e g options fitted number and type of modulating sources separate to or already fitted into a 19 inch rack whether or not leads are supplied ready made etc Note that extra unlisted parts may be required for connections to any Amplifier that is supplied see manuals supplied with them Typical Description Function Quantity 1 10A C13 IEC mains connector For connection to lead from mains supply distribution point Length as 3core 1 Omm per co
73. te MPX Input 2 Stereo Encoder 3 Re Broadcast Receiver Print Date 06 06 11 Page 36 of 42 E2170 00MA 04 2 4 4 Channel and Frequency Selection and Setting under Remote Control Channel and frequency control commands do not operate in isolation but instead must be performed in a defined sequence similar to that when using the local front panel controls see sections 2 3 3 2 3 4 and 2 3 5 This is to prevent unwanted or incorrect changes to the Exciter transmitted output frequency Errors in sequences or content will result in no confirming echo being returned and the sequence being aborted Each command in a set or select sequence must also be sent within one second of the channel number command or again no confirming echo will be returned and the sequence aborted To select a pre programmed channel the sequence is as follows channel 2 in this example Command Operation ASCII gt 2 Set for channel 2 gt l Select channel 2 for transmission Note that if any one of channels 2 7 is locked by the permanent grounding of a rear panel channel select line see section 2 3 5 then the second of the above commands will not send a confirming echo and the sequence will terminate with no action performed If possible the actual frequency programmed in channel 2 should be remotely checked beforehand to ensure it is the frequency required by sending 2 Channels 1 and
74. to 75kHz deviation typically better than 60dB Limiter and Clipper Separately selectable from front panel or remotely Automatic level control circuit limiting maximum peak deviation to approximately 55kHz Soft clipping circuit operating at approximately 70kHz Print Date 06 06 11 Page 14 of 42 E2170 00MA 04 1 3 3 Composite Input Module Specifications M option only Composite Input DC to 100kHz input via floating 75Q BNC connector Input impedance internally preset to balanced 75Q or 20kQ coaxial screen floating or unbalanced 75Q or 13 3kQ coaxial screen internally grounded Input sensitivity for 67 5kHz deviation exc pilot 8dBu 5 5V peak to peak adjustable from rear panel with maximum sensitivity typically 4dBu 3 5V Overall frequency response better than 0 2dB over 5Hz 15kHz rel 1kHz Measured with deviation excluding pilot set to 18dB below 67 5kHz 8 4kHz at 400Hz modulation fixed test level to pre emphasised test source then causing deviation to rise with modulation frequency Overall stereo separation better than 48dB over 40Hz to 10kHz typ 55dB Overall harmonic distortion better than 60dB 0 1 over 40Hz to 10kHz typ 66dB Measured in a bandwidth of twice the fundamental to 22KHz Overall signal to noise ratios better than RMS A weighted 75dB RMS CCIR468 3 weighted 65dB RMS unweighted 70dB Q Peak CCIR468 3 weighted 65dB Q Peak CCI
75. uence will terminate with no action performed the transmitted frequency cannot be altered directly If possible the actual frequencies set in channels 0 and 4 should be remotely checked beforehand and afterwards to ensure the change is made correctly by sending 4 each time Channels 1 3 and 5 7 can similarly be checked re programmed and checked again by replacing 4 in the above sequences with 1 3 or 5 7 as required Print Date 06 06 11 Page 37 of 42 E2170 00MA 04 Intentional Blank Page Print Date 06 06 11 Page 38 of 42 E2170 00MA 04 SECTION THREE OPERATION 3 1 GONTROLS AND DISPLAYS Marked Type Function SET POWER Preset 22T To set output power level anti clockwise to reduce power Potentiometer MOD LED Display Red indicates deviation above 80kHz Green indicates deviation between 15 and 80kHz Off indicates deviation below 15kHz Amber indicates Power on Reset period SYSTEM LED Display Red indicates one or more system conditions are abnormal NORMAL Green indicates all significant system conditions are normal Amber indicates Power on Reset period MUTE LED Display Red indicates that the Exciter is muted by the external Interlock circuit Amber indicates that the Exciter is muted by the mute control input or that the Power on Reset period is in progress Green indicates normal operation FWD P A LED Display Red indicates forward output power fai
76. uned passband filter to a passive double balanced mixer A single fixed frequency crystal oscillator provides the local oscillator injection for the mixer 10 7MHz below the RF input frequency The 10 7MHz F output from the mixer passes through a three stage amplifier ceramic filter to a integrated circuit which provides further amplification limiting and quadrature F M detection The audio output of the detector after amplification phase compensation low pass filtering and buffering provides the composite MPX output of the module which is fed to the Main Board A microprocessor at the front of the Re Broadcast Module provides all control and monitoring of the hardware on the board The received signal strength as a DC level is fed to an A D converter in the microprocessor The presence of a signal above a threshold level is also signalled to the microprocessor which interfaces via a serial data link with the hardware control microprocessor on the Main Board RS485 bus section 1 1 2 1 2 VARIANTS AND OPTIONS The main variants and options indicted by number or letter suffixes respectively are as follows E2170 01 Basic XE150 150W Exciter spaces for two optional modules E2170 02 Basic XE300 300W Exciter spaces for two optional modules E2170 03 Basic XE35 35W Exciter spaces for two optional modules E2170 04 Basic XE75 75W Exciter spaces for two optional modules E2170 05 Basic XE150 150W Exciter with rear
77. ustable over range of at least 25W to 75W XE150 Adjustable over range of at least 25W to 150W XE300 Adjustable over range of at least 30W to 300W Variation Not more than 0 5dB under all specified operating conditions Output Power Output power is automatically reduced or shutdown to ensure that any load Shutdown producing reverse power greater than approximately 15W XE35 75 or 30W XE150 300 including open and short circuits does not cause any damage to the Exciter Excessive heatsink temperature greater then 85 deg C or output amplifier current also automatically reduces or shutdowns the output power Reverse Reverse intermodulation products will be better than or equal to 10dB Intermodulation relative to the interfering incident signal this being offset over the range 300kHz to 20MHz but remaining within 87 5MHz to 108MHz Print Date 06 06 11 Page 10 of 42 E2170 00MA 04 Spurious and Harmonic Emissions In the range 9kHz to 1000MHZ Better than or equal to 75dBc typically better than 85dBc In the range 87 5MHz to 137MHz Better than or equal to 85dBc at greater than 500kHz removed from carrier Measured in a 10KHz bandwidth with and relative to an unmodulated carrier Adjacent Channel Spurious Emissions Better than or equal to 20dBc at 125kHz removed from carrier Better than or equal to 40dBc at 150kHz removed from carrier Better than or equal to 60dBc at 175kH
78. w pass filter in a separate screened section nine section Tchebycheff giving a very high level of attenuation at harmonic frequencies followed by a directional coupler to measure output forward and reverse power Sensors to measure heatsink temperature and output Mosfet current are also provided Voltages from the coupler and sensors are fed to the Control Board to enable accurate setting of forward output power with a automatic reduction in that power if reverse power heatsink temperature or output Mosfet current becomes excessive A low level sample of the output power is taken from the Amplifier Module after the low pass filter section to feed the front panel RF MON output connector As already described the Control Board contains analogue circuitry to generate a control reference voltage to set the bias voltage applied to the output Mosfet in the Amplifier Module This control voltage is initially set by the front panel SET POWER control to generate a desired power output level Excessive reverse power heatsink temperature or amplifier current above preset trip points then automatically adjusts the set control voltage gradually reducing the output power fold back Various muting or external interlock conditions also over ride the set control voltage instantaneously reducing the power output to a minimum A microprocessor on the Control Board provides all monitoring of the hardware on the board including analogue to digita
79. wanted At 400kHz unwanted level typically greater than 55dB relative to wanted At 250kHz unwanted level typically greater than 45dB relative to wanted Power Muting Signal Level 95dBm to 50dBm Indication outside this range indication is given as lt 95dBm or gt 50dBm Signal present is also indicated when the signal is above a preset level of approximately 80dBm Exciter Output The re broadcasted output signal from the Exciter is automatically muted when the received signal is not indicated as being present Re Broadcasted Output Signal With an RF input signal level of at least 50dBm Overall frequency response better than 0 3dB over 30Hz 15kHz rel 1kHz Measured with deviation excluding pilot set to 18dB below 67 5kHz 8 4kHz at 400Hz modulation fixed test level to pre emphasised test source then causing deviation to rise with modulation frequency Overall stereo separation better than 45dB over 40Hz to 6kHz typ 55dB dropping to better than 35dB at 10kHz Overall harmonic distortion better than 50dB 0 3 over 40Hz to 10kHz typ 55dB Measured in a bandwidth of twice the fundamental to 22KHz Overall signal to noise ratios better than RMS A weighted 70dB RMS CCIR468 3 weighted 60dB RMS unweighted 65dB Q Peak CCIR468 3 weighted 60dB Q Peak CCIR unweighted 60dB All measured relative to deviation of 67 5kHz excluding pilot and 400Hz modulation se
80. z removed from carrier Better than or equal to 80dBc at 200kHz removed from carrier Better than or equal to 85dBc at 300kHz to 500kHz removed from carrier Measured in a 1kHz bandwidth with a 75kHz deviation 400Hz mono signal Spurious levels relative to peak signal carrier sidebands i e within a spectrum mask defined by above limits External Standard Input 10MHz Input via 50Q BNC connector Input impedance balanced 50Q Locking Range greater than 10Hz Input level for automatic locking to external standard 3dBm 300mV rms pd to 13dBm 1V rms pd sinewave Modulation F3E monophonic or F8E stereophonic to CCIR recommendation 450 3 for pilot tone systems RDS and SCA modulation facilities as also provided Maximum deviation in excess of 200kHz at better than 40dB 1 distortion Deviation variation over carrier frequency range fixed input level Better than 45 3 75kHz at 75kHz deviation typically 43 2 25kHz Note that stereo modulation requires the S option Stereo Encoder to be fitted or the use of an external stereo coder feeding the Exciter s Composite MPX input Incidental Amplitude Modulation Synchronous AM due to FM Not greater than 0 3 with audio deviation excluding pilot of 40kHz at a modulation frequency of 400Hz equivalent to 50dB relative to 100 AM Asynchronous residual AM due to hum and noise with no FM modulation Not greater than 0 2 equivalent to

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