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TX 1000 PLUS service manual - 3

1. Summary of the STATUS menu September 2002 Service and Operation Manual Page 3 21 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description 3 1 15 ALARM SECTION TX 25 PLUS Throughout all alarm cases of anomalous functioning of the equipment the second line of the display which should read FWD 00 0 W will be replaced fig 1 In case it returns to function normally the display will read Normal fig 2 which indicates that protection has occurred Each intervention must be registered in the Event Log menu The equipment can be put on stand by and reset an infinite number of times and the display must indicate Stand by instead of Normal FREQ 107 95 MHz Fig 1 OVERHEAT LC FREQ 107 95 MHz NORMAL LC Fig 2 FREQ 107 95 MHz Fig 3 STANDBY LC The alarm conditions are the following 1 V Aux faliure When one of the two auxiliary voltages 15V is absent 2 P S Overload When the prime current passes the pre set value 3 Amperes 3 EXC V S W R When the output reflex power exceeds the pre set value of 5W 4 Over Heat When the temperature passes the pre set value of 68 C September 2002 Service and Operation Manual Page 3 22 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description 3 2 VL 1000 PLUS POWER AMPLIFIER 3 2 1 GENERAL BLOCK DIAGRAM VL 1000 PLUS The VL 1000 Plus is composed of seven basic blo
2. This product is intended to operate from a power source that will not apply more than 10 of the voltage specified on the rear panel between the supply conductors or between either supply conductor and ground A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation gt This equipment is grounded through the grounding conductor of the power cord To avoid electrical shock plug the power cord into a properly wired socket before connecting to the product input or output terminals gt Upon loss of the protective ground connection all accessible conductive parts including parts that may appear to be insulating can render an electric shock gt To avoid fire hazard use only the fuse of correct type voltage rating and current rating Refer fuse replacement to qualified service personnel gt To avoid explosion do not operate this equipment in an explosive atmosphere gt To avoid personal injury do not remove the product covers or panels Do not operate the product without the covers and panels properly installed 1 3 GOOD PRACTICES In maintaining the equipment covered in this manual please keep in mind the following standard good practices When connecting any instrument wattmeter spectrum analyzer etc to a high frequency output use the appropriate attenuator or dummy load to protect the final amplifiers and the instrument input When inserting or removing
3. CONTROL VL 1000 PLUS S3115D01 sse 3 27 32 8 L Excessive SWR Protection iaia e e SU ete dte 3 27 September 2002 Service and Operation Manual Page 3 1 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description 3 2 8 2 Power Supply and Power Amplifier Overheating ii 3 28 3 2 8 3 Supply Auxiliary Voltage 15V Failure ii 3 28 3 218 4 Measurement iaia 3 28 3 2 8 5 Display Failure S rai e ee cnet etd eed gen 3 28 3 2 8 6 Warning Temperature cc etie teer ier eere etie e 3 28 3 2 8 7 Function dB ihe ado ess 3 28 3 2 9 MENU COMMANDS s etetivetr ada 3 29 32 9 StartUp Condition us Asca ana rare 3 29 3 2 9 2 Menu Descriptions reete e p ee tases end NER EE SR RE ne NINE daa 3 29 3 2 93 Navigation commands se tts eSI I ERR SN ata 3 29 329 4 PO wich art essen ri 3 30 3 2 9 5 Upper line Menu parameter selection 3 31 3 29 6 Lower line Menu seeing event log and settings 3 32 3210 Meg 3 36 3 2 10 1 General information and warnings i 3 36 3 2 102 E vem dete edi 3 36 3 3 OPENING THE TRANSMITTER rh rt RP ERE EAE REESE nennt are 3 38 34 RESTRICTIONS FOR FM BROADCASTING TX 1000 PLUS sese 3 42 September 2002 Service and Operation Manual Page 3 2 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and
4. Exit September 2002 Service and Operation Manual Page 3 32 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description 3 2 8 6 1 Event Log submenu 1 After entering in this submenu you will see the last event as per the following example First line Second line Description Event name followed by its order number 12 56 09 06 00 Time and date in which the event happened 2 The O and keys you can scroll the various events The O key moves to the lower order numbers while the key moves to the higher ones The following list states the various events you could see and their description Event Description Normal Normal working condition Vaux Fail Auxiliary supply voltage failure PA Overheat RF power amplifier temperature was too high PA Unbalance The four stages of the RF power amplifier were unbalanced PS Overheat Power supply temperature was too high PS Overload The current required to the power supply was too high Exc SWR Reflected power SWR was too high Power On Stand By Al Start up condition Automatic stand by caused by an alarm Stand By Rem Manual stand by was performed 3dB Warning ON The amplifier automatically reduced its RF output power down to the half 3dB because the temperature was too high 3dB Cmd ON 3dbB manual command
5. Frequency Level menu allows the setting of the input regulator The procedure is the same as in the previous point 6 Clock Set The time and date are set by simply using the Up and Down buttons when the cursor is positioned on the character Then press ENTER to pass on to the next character 7 Data Set 00 00 00 A September 2002 Service and Operation Manual Page 3 16 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description 8 GSM This sub menu allows the programming of 5 GSM telephone numbers to send the following SMS message to General Alarm Model and Serial Number of the equipment 9 Al Mem Reset A complete reset of all alarm is possible by selecting this option EN 7 By using this option you can select the language required on the display 10 Language 11 Address Allows the setting of the address information of the RS485 port 12 Setting Mode With this menu you can select the possibility to set data locally or via Remote In case they are set via Remote the buttons on the front panel must be blocked When the equipment is controlled via Remote from the computer to the base the first option possible is the Setting mode Therefore if the TX is locally monitored it can be modified via the remote and the settings can be changed September 2002 Service and Operation Manual Page 3 17 CTE International 1000 w FM Transmitter TX 1000
6. Gnd Pin 2 connected RIGHT MONO to input Pin 3 connected to input Input balanced pins 3 2 Input unbalanced pins 3 1 2 to Gnd SWITCH The two switch indicated on the picture IMPEDANCE allow the setting of the input low AUDIO 1 frequency impedance AUDIO2 Switch ON 600 ohm Switch Off 10Kohm LEFT MPX The two trimmer indicated on the picture Adjustment allow the setting level of the input low RIGHT MONO frequency sensitivity They are working Adjustment only if the function 6 12dBm is selected SCA 1 SCA2 By means the above trimmer is possible Adjustment to set the two sub carrier from 1096 up to 90 of the nominal value REMOTE The above connector allows the connection with a GSM module for SMS sending and remote control features RS 485 IN OUT The twin male and female RS485 type connectors are designed for the eventual amp parallel connection of more amplifiers i 94 199000 O 0000 RS 232 The 9 pin DB9 type connector is designed for several remote controls and service i L D 4 4 4 September 2003 Service and Operation Manual Page 2 8 CTE International 1000 W FM Transmitter TX 1000 PLUS Features amp Operations 2 4 3 3 Wiring connections of the DB9 type connector PIN DESCRIPTION 1 STAND BY signal the contact is NO in normal operation connected to GND in STAND BY alarm 2 Signal which is pro
7. PLUS Circuit and Software description 3 2 9 2 3 PCB S3115D02 General controller Adjustment Test point function Value RV1 RV1 adjusts the measurement of voltage PA Volt read on the LCD display see 3 2 8 4 RV2 adjusts the total protection against excessive SWR 100W RV3 adjusts the measurement against excessive current PA Curr read on the LCD display see 3 2 8 4 RVA adjusts the measurement of reflected RF power Ref Pow read on the LCD display see 3 2 8 4 RV5 adjusts the RF output power in ALC condition 1000W RV6 adjusts the measurement of direct RF power Dir Pow read on the LCD display see 3 2 8 4 RV7 adjusts the 3dB output power 500W Adjustments of PCB S3115D02 General controller 3 2 9 2 4 PCB K3113C 01 Power Supply Unit Adjustment Test point function Value RV1 adjusts the power supply voltage 48V RV2 adjusts the maximum current for the protection 50A 48V RV3 adjusts the protection against over load 40A 48V RV4 adjusts the temperature measurement PS Temp read on the LCD display see 3 2 8 4 Adjustments of PCB K3113C 01 Power Supply Unit September 2002 Service and Operation Manual Page 3 37 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description 3 3 OPENING THE TRANSMITTER Make reference to the following pictures Front Panel Rear Panel B1 Fo O TAS
8. PLUS Circuit and Software description Summary of the SETTING menu mm Off u 75uS A v 6 0 6 12 dB A 00 00 00 September 2002 Service and Operation Manual Page 3 18 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description 0010009 12345 English Italiano 2 SETTING September 2002 Service and Operation Manual Page 3 19 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description 3 1 14 MENU STATUS TX 25 PLUS With this menu you can monitor some readings of the equipment This menu and the way to shift from the sub menu to the main menu works in a similar way as the Measure menu You can visualize the following 1 Mono or Stereo Indication on whether the equipment is set to operate in Mono or Stereo Clearly only one of the two options must be visualized 2 Pre emphasis 50usec 75usec Off Indication on the Setting of the pre emphasis 50usec 75usec or Off Clearly also in this case only one option must be visualized 3 L F L 6 0 6 12dB Low Frequency level is the input sensitivity setting and indicates the input attenuator condition Only one value can be shown 4 Address Shows the address of the RS485 September 2002 Service and Operation Manual Page 3 20 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description
9. PR OFF i EXIT Y 8 FAILURE COUNTER 16 i EXIT Y TIME SET m SET CLOCK TIME ry Y DATE SET gt SET CLOCK DATE ry l FRONT RS232 SWITCH REAR i EXIT Y ALARM MEMORY RESET ry Y ENGLISH LANGUAGE ITALIANO i EXIT Y ADDRESS SET ADDRESS ry YQ sl LOCAL gt to setting Y REMOTE gt to main menu SETTING MODE gt EXIT gt local to setting i remote to mainmenu Y EXIT September 2002 Service and Operation Manual Page 3 30 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description 3 2 8 5 Upper line Menu parameter selection As over stated the upper line normally shows the RF Output Power To show another parameter 1 Make sure that the asterisk is on the upper line or move it with the 4 and keys 2 Press the key in order to access the parameter list 3 With the and keys scroll the available parameters as per the following table Parameter Description Dir Pow RF output power in W Ref Pow Reflected power in W PA Volt RF power amplifier supply voltage in V PA Curr RF power amplifier drained current in A RF Temp RF power amplifier temperature in C PS Temp Power Supply temperature in C Time Current time hours minutes and seconds Date Current date in MM DD YY format Exit Its obviously not a parameter but a command to exit the menu without
10. Software description 3 1 TX25 PLUS FM EXCITER 3 1 1 GENERAL BLOCK DIAGRAM TX 25 PLUS The TX 25 Plus is composed of seven basic blocks Input L F 83132 Controller 83135 Stereo Coder 3133 Synthesis S3134 Power 25W S3131 and Power Supply S3130 The input is able to manage three different types of signals which are a External L F stereophonic signal b Mono signal from the right c Mono signal from the left These can all be balanced or unbalanced with an impedance of 600 ohm or 10Kohm On these signals it is possible to set a value of 50us or 75us The output board has two SCA inputs with a 10K impedance The L F signals pass through a 15Khz low pass filter which limits the modulation frequency band This is to avoid in case of stereophonic transmission interference with the sub carrier of the Multiplexer signal The left and right signals are combined in the stereo coder block A composed signal is obtained at the output of the summing amplifier which enters into AGC and limits its width Furthermore a clipper limits any modulation peaks that may occur The AGC and Clipper may both be excluded by the S6 and S1 The signal therefore enters the synthesis block The composed signal directly modulates the VCO The reference is obtained by a Tcxo at 12 8 Mhz and a micro controller sets the frequency on the PLL The Synthesis block has an RF output signal of approximately 10 dBm The power amplifier
11. TX 25 PLUS S3 D oeaio nee eee AEN 3 6 3 1 7 CONTROLLER CIRCUIT TX 25 PLUS 3135 nanenane a EA NN 3 7 3 1 8 START UP CONDITION TX 25 PLUS nia E EREN 3 8 3 1 9 MENU DESCRIPTION TAX 25 PLUS air r E ENAN EA AES eee ERR 3 8 3 1 10 FUNCTIONING OF THE DISPLAY TX 25 PLUS i 3 9 3 111 DETAILS OF EACH MENU TX 25 PLUS sese 3 10 3 1 12 MENU EVENT LOG TX 25 PLUS o 3 12 341 13 MENU SETTING TX 25 PLUS erdt ae rede eri b e ae redis 3 15 3 1 14 MENU STATUS TX 23 PLUS inhians nei d ki redi a ana 3 20 3 1 15 ALARM SECTION TX 25 PLUS ent enter tieedits 3 22 32 VL1000 PLUS POWER AMPLIFIER ener ener trennen nennen 3 23 3 2 1 GENERAL BLOCK DIAGRAM VL 1000 PLUS 3 23 3 2 2 INPUT POWER SPLITTER VL 1000 S3109B 3 23 3 2 3 RF AMPLIIFER MODULE VL 1000 PLUS S3110A01 eene 3 23 3 2 4 OUTPUT POWER COMBINER VL 1000 PLUS S3110A01 sene 3 24 3 2 5 RF LOW PASS FILTER VL 1000 PLUS S3119A 3 24 32 6 RF CONTROL CIRCUIT VL 1000 PLUS K3123A01 esee 3 24 3 2 7 POWER SUPPLY VL 1000 PLUS K3113C01 esee 3 25 3 2 7 1 Front panel connections Main Filter sss eene 3 25 3 2 7 2 Starting Point Limitation Circuit eene neret 3 25 3 2 7 3 Power Supply Stage ener nnne eren nennen nre 3 25 32 7 4 Auxiliary Voltage Supply sess eere eene nnne nnne 3 26 32 8 GENERAL
12. TX 1000 PLUS Circuit and Software 3 2 7 GENERAL CONTROL VL 1000 PLUS S3115D01 The General Control Board is obtained with a microprocessor PIC17C756A with following characteristics Clock 16MHz 12 input A D 10bit 2 Universal asynchronous receiver transmit The microprocessor is connected at the memory EEPROM 93C86 that has an 1K word capacity at the data time chip at an interface for two COM port RS232 and an interface for one COM port RS485 The microprocessor control all the protection of the power amplifier Excessive SWR Power Supply Overheating Power Amplifier Overheating Supply Auxiliary Voltage 15V Failure Unbalanced Power Moreover it manage the navigation on the display of the functions Measure Display Failures Language Reset Mode Warning Temperature Power Output 3 dB Failure Counter Time and Data Set 3 2 7 1 Excessive SWR Protection The amplifier has two protections by the SWR The first detector is located in the power amplifier module and the second is located in the Low Pass Filter The first protection has an intervention time more quickly than the second In case of not correct antenna s impedance the General Control gives a signal at the power supply it reduce the output voltage and so the RF output power will be reduced to have the maximum level of the SWR 1 8 If there is a momentary spike of the reflected wave ratio SWR the detector on the power amplifier module gives a signal at the control circuit
13. Unbalanced less than1 5 1 7 16 Female Synthesiser Micro gt 60dBc F3E F8E Direct FM Carrier Frequency 75 KHz 100 2 5 over 6 months 3 From 87 5 to 107 95 MHz TCXO 12 8 MHz 300Hz 3months lt 75dBc lt 90 dBc Flat 50 75uS gt 65 dB weighted Refto 100 AM 5 September 2003 Service and Operation Manual Page 2 4 CTE International 1000 W FM Transmitter TX 1000 PLUS Features amp Operations 2 4 LOCATION MAIN PARTS AND CONNECTORS 2 4 1 FRONT VIEW Please make reference to the following pictures in order to locate the main parts of the FM transmitter 93 2 1 510 all T TT g LLLLLELEEELLLELE LEE LELE LET LEL ELLE LLEELLL LE LE ELELLELEEE LE DE D0ONCNNONONONO ONS BERN 000 go00800900 900000000 RUNE AA AAA ii liiiiliiiibililm 6 8 74 Number Description 1 SWITCH ENTER for the drive and for the amplifier 2 SWITCH DOWN for the drive and for the amplifier 3 SWITCH UP for the drive and for the amplifier 4 LED MAINS POWER indicates that the AC mains power is available 5 LED PLL LOCKED 6 RS232 PC CONNECTION The RS232 type connector is an auxiliary RS232 front connection 7 RF FREQUENCY MONITOR The connector marked with R F Probe is a 40dB output coming from the RF filter unit suitable for linear RF measurements in the 87 5 to 107 95 MHz frequency range 8 BASE BAND FREQUENCY MONITOR L F Probe 9
14. and highlights unwanted events Therefore any signal which is not referred to the ground or the accidental removal of the EC2 connector forces the power supply in stand by mode September 2002 Service and Operation Manual Page 3 25 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description The output voltage 100 Hz ripple is less than 20 mVPP at full load in order to minimize the residual AM modulation The total efficiency of the two conversion stages is 0 88 3 2 6 4 Auxiliary Voltage Supply A voltage supply main direct with three output voltage 15 and 15 additional 15 for the fans composes this circuit The 15 and 15 voltages are necessary to feed all the chip of the equipment and the additional 15 is dedicated for the fans On the output of the fans supply are plaecd two fuse to save the fans against short circuitThe circuit is protected of an over charge short circuit of the output voltage At the beginning of this stage the fuse F4 protects the whole auxiliary stage The stage is obtained by a flyback type stage made by the MosFET Q11 the transformer T4 diodes D16 and D18 as well as capacitors C78 C96 and C79 The regulation IC is UC3844 U7 The transformer T4 offers a galvanic insulation between the generated auxiliary voltages and the source the output coming from the bridge September 2002 Service and Operation Manual Page 3 26 CTE International 1000 w FM Transmitter
15. contact is NO in normal operation 15 Common alarm contact see 13 and 14 September 2003 Service and Operation Manual Page 2 11 CTE Internationa 1000 W FM Transmitter TX 1000 PLUS Features amp Operations 2 5 BLOCK DIAGRAM INSERIRE PDF IN FORMATO A3 FILE TX 1000 PLUS Schema Blocchi Details 1 September 2003 Service and Operation Manua Page 2 12 CTE International 1000 W FM Transmitter TX 1000 PLUS Features amp Operations 2 6 OPERATIONS 2 6 1 PUTTING IN OPERATION 2 6 1 1 Unpacking After unpacking the Fm transmitter and choosing a suitable place to put it check that all the necessary parts are available to continue 1 Spare fuses 2 AC power plug inside its package 3 Documentation 2 6 1 2 Connections 1 AC power plug inside its package Make sure that the AC power switch I O a is in O Off position 2 Connect all the earth wires coming from the other devices fitted in the rack to the earth terminal e provided in the rear of the equipment and marked with the appropriate symbol 3 Connect the AC power cable to the AC power plug following the instructions printed on its package taking particular care with the earth connection 4 Ensure that the AC mains supply voltage is either 230Vca 15 or 110Vca 15 and insert the AC power input plug in the AC connector located in the rear of the FM transmitter 5 Ensure that the antenna or amplifier is suitable for the F
16. for the AGC controlling of the direct and reflected power The output of the U21c and U21d are summed by the double diode D5 to obtain a DC voltage to drive the base of the power transistor Q12 TIP31c This voltage is variable from 4 5V to 13 5V and allow a power regulation from 0 5W to 25W The input signal Right Mono and Left MPX coming from the EC2 connector and if the transmitter is configured in STEREO mode these audio signal are connected directly to the pre emphasis filters U3 4051 U400a TI072 e U12 4051 U13 TLO72 Subsequently the audio signal is connected to the 15KHZ filter The filtered signal will be available on the EC4b connector coder stereo The Multiplexed signal will be available on the EC4a If the transmitter is in MONO operation the microprocessor will commutate the output of the IC U11 4051 e U5 4051 to connect the Mono signal to the IC U10b TLO72 This component is an IC summing amplifier that provides to mix all the signal included the SCA The two trimmers RV10 mono and RV13 MPX reduce the difference level between the two channels up 0 1 dB max The output of the U10b is connected to the input of U32 4051 e U33 4051 that drive from the U35 provide to reduce the level of the low frequency signal in case of over modulation only This integrated circuit is programmed through the S4 connector The jumper S6 put ON or OFF the limiter function On the output of the U31 is placed the clipper U14b that cu
17. located in same module and it reduce the voltage of the BLF278 s gate description September 2002 Service and Operation Manual Page 3 27 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description 3 2 7 2 Power Supply and Power Amplifier Overheating When the heatsink temperature of the power amplifier module and power supply module reaches about 80 C the general Control switches the Power Supply off In this case the equipment is in Stand by mode During this process the fans will work when the temperature will reach less than 70 C approx the general control restores the normal Power Supply operation 3 2 7 3 Supply Auxiliary Voltage 15V Failure This supply voltage is important to control the voltage on the BLF278 s gate If it shall be broken The equipment will go in stand by 3 2 7 4 Measure The measurement available via the menu see 3 2 8 4 are forward a direct power voltage and current of the Power Amplifier temperature regarding heatsink power supply and power amplifier date and time 3 2 7 5 Display Failures The failures display indicates the alarm type that the equipment has SWR etc 3 2 7 6 Warning Temperature If this option is ON when the heatsink temperature of the power amplifier module and power supply module reaches about 70 C near to the level of overheating alarm the General Control adjusts the equipment in order to output the half of the rated full power
18. printed circuit boards PCBs cable connectors or fuses always turn off power to the affected portion of the equipment After power is removed allow sufficient time for the power supplies to bleed down before reinserting PCBs When troubleshooting remember that FETS and other metal oxide semiconductor MOS devices may appear defective because of leakage between traces or component leads on the printed circuit board Clean the printed circuit board and recheck the MOS device before assuming it is defective When replacing MOS devices follow standard practices to avoid damage caused by static charges and soldering When removing components from PCBs particularly ICs use care to avoid damaging PCB traces September 2003 Service and Operation Manual Page 1 3 CTE International 1000 W FM Transmitter TX 1000 PLUS General information 1 4 FIRST AID IN CASE OF ELECTRICAL SHOCK If someone seems unable to free himself while receiving an electric shock turn power off before rendering aid A muscular spasm or unconsciousness can make a victim unable to free himself from the electrical power DO NOT TOUCH VICTIM OR HIS CLOTHING BEFORE POWER IS DISCONNECTED OR YOU CAN ALSO BECOME A SHOCK VICTIM If power cannot be turned off immediately very carefully loop a length of dry non conducting material such as a rope insulating material or clothing around the victim and pull him free of the power Carefully avoid touching
19. was enabled 3dB Off 3dbB manual command was disabled 3 You can see up to 99 events which are stored in FIFO First in First Out and divided into two 50 events blocks As soon as the event 100 happens the older 50 event bloc is automatically canceled in order to make room for other future 49 events 4 The key pressed from any event allows to escape the event list and come back to the Event Log screen shot If there aren t stored events or the reset has just been performed the E key has no effect 3 2 8 6 2 Display submenu The submenu Display allows to see in one screen shot all the settings which will be described in the next paragraph After entering in this submenu you will simply see them in short format as per the following example September 2002 Service and Operation Manual Page 3 33 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description Display First line 3dB Off 232Rear Second line Warn On C_8 R24 This is a brief description of the related meanings The caption 3dB Off means that the amplifier is working at the full rated power 1KW 232Rear means that the rear RS232 connector is enabled the front connector is therefore disabled Warn On means that in case of RF power unit overheating the power will be automatically reduced to the half 250W The caption C 8 inside the machine there is a counter which counts the eventual failu
20. 1000 PLUS S3119A The output signal coming from the power amplifier module is connected to the input of a low pass filter This filter is a constant coupling type and it is composed by two rr network section including two second harmonic traps The filter s capacitors consist in microstrips printed on a Teflon substrate The inductances are made in silver laminated copper wire wound in air The directional coupler is obtained with microstrips technology it offers two voltages depending by the forward and reflected power In this module is placed a probe RF 60db connected by a coaxial cable to the fron panel 3 2 6 RF CONTROL CIRCUIT VL 1000 PLUS K3123A01 The protection function of the four BLF278 stages is obtained by the Control Circuit The amplifier is protected of the excessive SWR excessive unbalanced powers and overheating The signal WR coming from the reflected power detector of the RF module it s amplified by U2A and will reach the comparator U2D If the reflected power will excess the pre set value set by the resistive trimmer RV1 the comparator U2D its output representing an excessive reflected power level The signal of unbalanced UMB2 previously processed is offered to the diode D12 to the input of buffer U2B The output of U1B is connected to the comparator U2C which output represents excessive internal unbalanced power error The intervention protection level of UMB2 can be adjusting with the resistive trim
21. 25 PLUS This menu allows you to visualize all the operations undertaken by the equipment in chronological order Once the number of operations reaches 99 the memory of the operations cancels the first operation in chronological order For each operation the equipment will display the type of operation on the upper line and the date and time on the lower line Each time the equipment returns to the normal function this event is also recorded as Normal with date and time To move within this sub menu you must use the Up and Down buttons while if you press ENTER from any position you will return to the EVENT LOG menu The menu is composed by the following 1 Excessive V S W R This signal will be memorized when the maximum power will exceed the 5W set limit 2 Power On Indicates that the equipment is switched on 3 Over Heat This is the maximum temperature display signal which corresponds to 68 C 4 Stand by Al alarm This signal is memorized each time one of the alarm protection sections intervenes and the equipment is automatically set on Stand by September 2002 Service and Operation Manual Page 3 12 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description 5 P S Overload This signal refers to the maximum PA Current 3 Amperes 6 V aux failure Indicates that one of the two auxiliary power supplies is absent 7 Stand by Re This signal
22. D OPERATION MANUAL 2 FEATURES amp OPERATIONS CONTENTS 24 INTRODUCTION u He ee 2 2 22 PURPOSE nee li a einen 2 2 23 TECHNICAL SPECIFICATIONS ans teaser denen 2 3 2 3 1 ENVIROMENTAL see eg nein acct aamteeessaenetie 2 3 2 9 2 MONO OPERATION itte ho ettet bae beta dada tiene 2 3 23 9 SSTEREQ PARAMETERS eoriet aA REEE A EAEE natae te tU elect abiret 2 3 23 4 RE CHARAGCTERISTIG HH ee deine tamen avi oasi 2 4 2 4 LOCATION MAIN PARTS AND CONNECTORS reiecit ne eiriaa rA enne 2 5 2 4 1 FRONT VIEW 2 5 2 4 2 REAR VIEW EXGLITER i edet ueluti tee betae seines 2 6 2 4 3 DESCRIPTION OF CONNECTOR AND SETTING 2 7 2 4 3 1 Front panel c nneelionse oot et ha het Ads tum te luis c innen Herne 2 7 2 4 3 2 Rearpanel connection Si tete ea iir baldo ken Heiler 2 8 2 4 3 3 Wiring connections of the DB9 type connectori eene 2 9 244 CREAR VEW AMPEIFIER eee n ee eet cle RE eee ERR Re eo 2 10 2 4 4 1 Rear panel D H 2 11 2 4 4 2 Wiring connections of the DB15 type connectori eene 2 11 20 BLOCK MAGRA M m 2 12 2 67 OPERATIONS are RR eier 2 13 2 6 1 PUTEING IN OPERATION iiec cre tete een ee 2 13 2 6 1 1 WM PACKING ep 2 13 2 6 1 2 Connections I 2 13 206 2 SWITCHING THE SYSTEM QN 22 22 ee ee i 2 14 26 CARES AND MAINTENANCE 2 irent ai 2 14 September 2003 Se
23. Do not assume that all danger of electrical shock is removed when the power is off Charged capacitors can retain dangerous voltages for a long time after power is turned off These capacitors should be discharged trough a suitable resistor before any circuit points are touched gt Don t take chances Be fully trained CTE International equipment should be operated and maintained by fully qualified personnel gt Do not service alone and do not perform internal adjustments of this unit unless another person capable of rendering first aid and resuscitation is present gt Some components used in the construction of this equipment contain Beryllium Oxide BeO This substance is harmless as it is but becomes highly dangerous if it is ground to powder Special procedures of disposal must be observed in case of failure of these devices NOTE This section is not intended to contain a complete statement of all safety precautions which should be observed by personnel in using this electronic equipment or others CTE International shall not be responsible for injury or damage resulted from improper procedures or from using it by improperly trained or inexperienced personnel September 2003 Service and Operation Manual Page 1 2 CTE International 1000 W FM Transmitter TX 1000 PLUS General information 1 2 GENERAL SAFETY RECOMMENDATIONS When connecting the equipment to the power please follow these important recommendations gt
24. LCD DISPLAY Control panel It is composed by an alpha LCD display The LCD display normally shows the amplifier s status and another parameter e g power time date etc The combination between the keypad and the LCD makes easy to provide settings check measurements etc 10 LED ALARM Indicates that an alarm has been occurred on the TX 25 PLUS 11 DCOUT shows the availability of the power supply output voltage 12 ALC when glowing shows that the ALC Automatic Level Control is engaged so the output RF power can be kept constant 13 VSWR glows when the VSWR is excessive 14 LED ALARM Indicates that an alarm has been occurred on the VL 1000 PLUS REMOTE REMOVABLE AIR FILTER AC Mains power switch Allows to switch on off the whole Transmitter September 2003 Service and Operation Manual Page2 5 CTE International 1000 W FM Transmitter TX 1000 PLUS Features amp Operations 2 4 2 REAR VIEW EXCITER 2 345678 9 10 UNE NH gH CILE BM liM Jd NEL SUI F 16 15 14 12 13 11 Number Description 1 LEFT amp MPX NPUT Left MPX external input 2 RGHT amp MONO INPUT Right Mono external input 3 Left MPX input impedance switch 600 ohm 10Kohm 4 Right Mono input impedance switch 600 ohm 10Kohm 5 Left MPX level adjustment 6 Right Mono level adjustment 7 RDS AND SCA INPUT SCA sub carrier input level adjustment 8 RDS AND SCA INPUT
25. M broadcasting frequency range e from 87 5 to 108 MHz and connect it to the N type RF output connector available in the rear of the transmitter 6 Switch the exciter on and adjust it to the minimum output power e 8 7 Connect the exciter s RF output to the N type RF input connector located in the rear panel 8 Now the equipment is ready to work at the minimum configuration September 2003 Service and Operation Manual Page 2 13 CTE International 1000 w FM Transmitter TX 1000 PLUS Features 2 6 2 2 6 3 SWITCHING THE SYSTEM ON AC power plug inside its package Make sure that the AC power switch O o is in O Off position Switch the FM transmitter on by pressing the AC Power switch I O a in I position Set the frequency and wait the PLL LED switching ON Set the required output power Carefully and slowly raise the exciter s output power and stop at the point in which the ALC LED ALS will steadily glow Now the system is operating If all is properly working the following LEDs should glow DC OUT pc our meaning that the power supply voltage is available and POWER POWER AC mains power is available Now the system is operating If all is properly working the following leds should glow LED PLL meaning that the PLL is locked and POWER AC mains power is available Moreover the upper line of the LCD display should show the output power and the lower should visualize Normal normal working con
26. O O euro uo ie eue Ini liiiiViiii nimii IH nu nimii u miii 0000000 O O O O O u O Removing the top cover Unscrew the nine screws which fix the top cover in place Removing the bottom cover Unscrew the ten screws which fix the bottom cover in place ON a Dismounting fans Use an allen key to remove the four exagonal screws which hold the handles 2 screws each handle marked A to the rear panel e Use an allen key to remove the hexagonal securing screws marked B1 and B2 placed over and below the left fan marked on the rear external panel with a circle the rear external panel will be free to be tilted Remove fan cables from the Power Supply board Remove the rear panel together with the two fans Unscrew the four cross head screws which lock the fan s on the panel marked C and or D Replace the fan s and the related vent filter s as described in the manual September 2002 Service and Operation Manual Page 3 38 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description CAUTION 1 At step 2 the rear external panel can just be tilted not removed Take care about all the internal wires CAUTION 2 The missing regular filter replacement or cleaning will activate the thermal protection co e 000 Dismounting vent filter s Use an allen key to remove the four exagonal screws which hold the vent grid located on the front panel marked wit
27. Rear panel Additional connectors rear Number Description 1 The twin male and female RS485 type connectors is designed for the eventual parallel connection of more amplifiers The RS232 type connector is designed for the connection to the exciter ifthe exciter supports such this connection The BNC connector is for the carrier enable The 15 pin DB15 type connector is designed for several remote controls and services as described in paragraph 2 4 4 2 AUX is a general purpose auxiliary switched AC output 2A max oy Po N 2 4 4 2 Wiring connections of the DB15 type connector PIN DESCRIPTION 1 GND 2 Signal which is proportional to the power supply module output voltage 1V 10V 3 Signal which is proportional to the square root of the direct power 5V 1000W 4 For factory use only 5 GND 6 STAND BY command line activated by short circuiting this line with GND 7 Reserved 8 RESET command line activated by short circuiting this line with GND 9 Signal which is proportional to the power supply module output current 1V 10A 10 Signal which is proportional to the square root of the reflected power 4V 50W 11 For factory use only 12 STAND BY signal the contact is NC in normal operation connected to GND in STAND BY alarm 13 NO alarm contact the contact is NC in normal operation connected to PIN 15 in ALARM mode 14 NC u contact the
28. SCA2 sub carrier input level adjustment 9 RF OUTPUT RF output connector N female 10 MAINS SWITCH AC Mains power switch Allows the whole amplifier to be switched of or off 11 INPUT MAINS PLUS FUSE AC power input plug IEC type 90 265V 50 60Hz 12 SCA2 input sub carrier 13 SCA1 input sub carrier 14 RS 232 VL1000PLUS CONNECTION RS232 DB9 female only GSM 15 Remote control DB9 Female 16 RS 485 INPUT OUTPUT RS 486 In Out DB9 Male Female September 2003 Service and Operation Manual Page2 6 CTE International 1000 W FM Transmitter TX 1000 PLUS Features amp Operations 2 4 3 DESCRIPTION OF CONNECTOR AND SETTING A total of 11 connectors are available in the FM transmitter Three of them are located in the front panel and the other 8 are located in the rear panel 2 4 3 1 Front panel connections PICTURE ITEM DESCRIPTION RS 232 The RS232 type connector 6 is an O O auxiliary RS232 L F The connector marked with L F 8 isa low frequency output coming from L F AGC output PROBE 60 The connector marked with RF probe 7 dB is a 40 dB output coming from the RF Filter Unit suitable for linear RF measurements in the 87 5 to 107 95 MHz frequency range September 2003 Service and Operation Manual Page2 7 CTE International 1000 W FM Transmitter TX 1000 PLUS Features amp Operations 2 4 3 2 Rear panel connections PICTURE ITEM DESCRIPTION LEFT MPX Pin 1 connected to
29. TER button on the last digit you will access to the sub menu that allowed to set the frequency After the required selection press enter to go back to the frequency menu This procedure is the same for all the successive menus It is not possible to set a frequency below 87 50 MHz and above 107 950 MHz When the ENTER button is pressed on the last digit the power goes to 0 and then returns to its nominal value after 3 4 seconds 2 Output Power Output Power Instructions to set the output power Press Enter to pass on to the output power menu Vary the power by using the Up and Down buttons By pressing ENTER on the last digit you will access to the sub menu that allows the power to be set After the required selection press enter to go back to the power menu September 2002 Service and Operation Manual Page 3 15 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description 3 Stereo Wm This option allows to set the equipment in the Stereo mode By entering the sub menu you can select On or Off This is done by using the Up and Down buttons and confirming by pressing ENTER which will also make you return to the menu The Stereo option can only be selected once the stereo coder is inserted in the connector 4 Pre emphasis En a The procedure to enter select and set this data from the sub menu is the same as in point Nr 3 5 L F L 6 0 6 12 dB A The Low
30. ZA s Rees ceca September 2002 Service and Operation Manual Page 3 43 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description GERMAN FM Broadcasting Abweichungen von ERC Vorschriften und Kommentare eingef hrt BELGIEN D NEMARK DEUTSCHLAND FINNLAND FRANKREICH GROBBRITANNIEN IRLAND ITALIEN LUXEMBURG PORTUGAL Individuelle Lizenz erforderlich LATIN AMERICANO GRIECHENLAND Exigida licenga individual Exigida licenga individual September 2002 Service and Operation Manual Page 3 44
31. a 4867 KHz quartz The U14 IC works as a buffer for the U5a The power supply of the circuit gives a dual tension of 8 Volts which comes form the controller board The Left and Right signals are amplified by U10a and U10b and integrated resistant circuit The U8 IC 4051b which is piloted by a U5 4520 composes the multiplexer signal The 100 KHz low pass filter is composed by the operational U4 and U3 At 19Khz the signal is obtained from the integrated resistant circuit on the U7 4051 which is also piloted by the U5 The signal is filtered by the U1 and U20b At 19 KHz the R37 trimmer regulates the signal percentage The U20a IC is a summing amplifier which mixes the Multiplexer signal the 19 KHz signal and a percentage of the right and left signals that are regulated by the R50 and R49 trimmers A composed signal with width almost equal to 8 8 Vpp is obtained as output from the U3a As output from the U3a a phase compensation at frequencies from 10 KHz to 15 KHz is obtained while the R36 trimmer regulates the phase at 19 KHz and at 38 KHz September 2002 Service and Operation Manual Page 3 6 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description 3 1 7 CONTROLLER CIRCUIT TX 25 PLUS S3135 Besides having its own functions the controller also as a connection controller for the various external functions The U23 3062 IC microprocessor is the master of the board The flash memory makes
32. and Software description power to the half 3dB Setting Description Available settings Notes Display Same submenu explained in the A quick visualization of the settings dedicated paragraph which is automatically recalled after a setting has been changed Reset Mode Defines if the failure counter should R24 every 24hours be regularly reset and the reset time Ron At Power on Rne never Exit exit without affecting the preset value Warning If this warning feature is set to on Warn on waring feature is on the amplifier automatically reduces Warn off warning feature is off its power down to 1000W 3dB in Exit exit without affecting the case of overheating 10 C below preset value the critical temperature 3dB Manual reduction of the RF output 3dB on half power 500W 3dB off full power 1000W Exit exit without affecting the preset value Failure Counter Defines the number of faults which the failure counter must count before Switching the amplifier into stand by condition C 8 stand by after 8 faults C 16 stand by after 16 faults Exit exit without affecting the preset value Time Set Allows to set the internal clock Use the O and keys to increase decrease each figure and press the key to enter In the minutes time setting figures can be increased decreased at 10 digits steps by keeping either the O and O keys held pressed D
33. appears each time the equipment is put on remote Stand by through the RS232 or through the Remote connector 8 PII Unlocked This event is memorized when the PLL is Unlocked 9 Normal This last event is displayed each time the equipment returns to its normal functioning September 2002 Service and Operation Manual Page 3 13 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description Summary of the EVENT LOG menu September 2002 Service and Operation Manual Page 3 14 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description 3 1 13 MENU SETTING TX 25 PLUS The SETTING menu is used to set all the data for the functioning of the equipment You must digit a password to access this menu To move inside the main menu you simply press the Up and Down buttons while to set data you must use the ENTER button which brings you to the sub menu To exit the SETTING menu you must go to the 13 option Exit and press the ENTER button There are 12 sets of parameters that can be set 1 Frequency Frequency By pressing the ENTER button the cursor will place itself on the first MHZ digit To write the number you must use the Up or Down buttons to increase or decrease the number required form O to 9 By pressing on ENTER button you will save the data and pass on to the next digit Follow the same procedure for each next digit By pressing on EN
34. ata iii 1 5 1 5 WARNING INSTRUCTION etico ort een astra 1 6 1 5 1 INTRODUCTION m X 1 6 1 5 2 CHECKING OF SAFETY CONDITIONS meeenmren nennen ne nenr et 1 6 1 5 3 AC DC EINE WARNING tecti prt rhe ettet eit tet betae ti rera eines 1 6 15 4 SERVICE and OPERATIONAL WARNING i 1 6 19 97 WARNING SYMBOL Sini aiite errato ti den an ee nee ee Tasa au anne RR Ten EA RED ia 1 7 September 2003 Service and Operation Manual Page 1 1 CTE International 1000 W FM Transmitter TX 1000 PLUS General information 1 1 SAFETY SUGGESTIONS Regardless of how well electrical equipment is designed personnel can be exposed to dangerous electrical shock when protective covers are removed for maintenance or other activities Therefore it is incumbent on the user to see that all safety regulations are consistently observed and that each individual assigned to the equipment has a clear understanding of the first aid related to electrical shocks see next pages In addition these safety practices must be followed gt Do not attempt to adjust unprotected circuit controls or to dress leads with power on Always avoid placing parts of the body in series between ground and circuit points gt To avoid burns do not touch heavily loaded or overheated components without precautions Remember that some semiconductor cases and solid state circuits carry high voltages
35. ate Set Allows to set the internal calendar in MM DD YY format Use the O and keys to increase decrease each figure and press the key to enter RS232 Switch Switches the RS232 connection between the rear and the front connector 232Rear rear RS232 connector 232Front front RS232 connector Exit exit without affecting the preset value Al Mem Reset Manual reset of the event log and failure counter It also escape the Setting menu leading back to the Main menu Language Selects the needed language for the LCD messages among the available languages English is the default The number of the available languages depend on the version Address Allows to set up the address of the RS485 connector Leads to Set Address screen shot Exit Escapes the setting menu and restore the Main menu September 2002 Service and Operation Manual Page 3 35 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description 3 2 9 SERVICE 3 2 9 1 General information and warnings CAUTION Only qualified and authorized engineers are allowed to perform the following service operations CAUTION The amplifier may only be removed from the rack rackmount or opened and module disassembled and assembled while no voltage has been applied Before performing any operation be sure that the AC plug is disconnected the power switch is in OFF position and wait
36. changing the current parameter 4 Press the 4 and keys in order to move the asterisk to the line which shows the new parameter to be selected or to Exi t in case you want to keep the current parameter 5 Press the key in order to select the new needed measurement or escape the list in case you selected Exit September 2002 Service and Operation Manual Page 3 31 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description 3 2 8 6 Lower line Menu seeing event log and settings As over stated the lower line shows the amplifier status and can t be changed however this selects a Menu which allows to read the Event log as well as to read change some settings To access to this menu 1 Make sure that the asterisk is on the lower line or move it with the and keys 2 Press the key to access the menu 3 With the and keys you can select three submenus Submenu Description Event Log Allows to see the event log Display Allow to see in one screen shot all the settings described at 3 2 8 6 2 Setting Allow to change each of the various available settings access protected by a 3igits password Local Remote Setting of the operational mode Exit Its obviously not a submenu but a command to come back to the main menu 4 Press the key in order to select the new needed submenu or escape the submenus in case you selected
37. cks Input Power Splitter S3109B RF Amplifier module S3110A01 Output Power Combiner S3111B RF Low pass Filter S3119A RF Control Circuit K3123A01 Power Supply K3113C01 Main AC supply filter S3114D General Control S3115D01 Connection rear panel LCD Display unit S3120B Keyboard Keyboards ED 3 2 2 INPUT POWER SPLITTER VL 1000 S3109B The input power from the exciter is applied to a 2 WAYS splitter 3 Db 90 the signals on the outputs are out of phase by 90 The resistive termination resistor R1 absorb the unbalanced power when one of the BLF278 stages fail 3 2 8 RF AMPLIIFER MODULE VL 1000 PLUS S3110A01 The amplifier circuit is composed two identical base modules The input matching of the active device BLF278 composed of two FET is done by means of the transformation ratio 4 1 of transformer T1 by the capacitor C1 C2 and by the inductor L1 The resistors R1 R2 R3 and R4 connected between the four gates of BL278 serve to increase the margin of stability of the amplifier and at the same time to get a SWR that is acceptable over the whole operating frequency band The two FET composing the BLF278 operate in push pull mode The line connected between the two drains serves to compensate for the capacitate component of the output impedance The ensuing impedance is raised by the transformation ratio 1 4 of the transformer T2 and so taken to the value of 500 by the adapter circuit composed o
38. ction is not cyclic Therefore after selecting the last menu item it s necessary to press the O key in order to scroll the items back To access a menu item in order to change set it move the position of the asterisk on that item by pressing the and keys and then press the key By pressing at the same time the two keys O and O the Main Menu is recalled and the selected menu item won t be changed September 2002 Service and Operation Manual Page 3 29 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description 3 2 8 4 Flow chart The flow chart of the menu is organized as follows MENU FLOW CHART VL1000 DISPLAY OP v 1 08 DIR POW UP amp DOWN ARROWS KEYS TO MOVE CURSOR ENTER KEY TO SELECT REF POW PA VOLT MEASURE gt PA CURR i RF TEMP PS TEMP TIME DATE EXIT Y STATUS ul EVENTLOG gt DISPLAY EVENTS chrono order DISPLAY SETTINGS pe gt 3dB 232 a NO WEE CRIT I local la sl SETTING remote ENTER PASSW EXIT DISPLAY SETTINGS fe ry EVERY 24H Y AT POWER ON RESET MODE NEVER of alarm counter i EXIT Y ON WARNING m OFF i EXIT Y ON 3DB
39. dition The LCD Display should stay back lighted for 30 minutes after the last button pressed Check the forward and reflected RF power CARES AND MAINTENANCE As many other electronic equipment this transmitter need some care which is mandatory to guarantee years of perfect operation On the other side if maintenance operation is not regularly carried out faults can occur particularly in harsh environments Air cooling fans must be regularly inspected and replaced every 10 000 hours Vent air filter must be regularly replaced or cleaned according to the environment conditions September 2003 Service and Operation Manual Page 2 14 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description TX 1000 PLUS 1000 W FM TRANSMITTER OPERATION MANUAL 3 CIRCUIT AND SOFTWARE DESCRIPTION CONTENTS 3 1 TX23 PLUS EM EXCITER cierre Run Ns mungen 3 3 3 1 1 GENERAL BLOCK DIAGRAM TX 25 PLUS sese 3 3 3 1 2 VCO SYNTHESIS TX 25 PLUS 83134 iiec nennen 3 4 3 1 3 POWER AMPLIFIER TX 25 PLUS 83131 essere enne 3 4 3 1 4 POWER SUPPLY TX 25 PLUS S3130 ener nnne nenne 3 5 3 1 4 1 Front panel connections Main Filter ene enn 3 5 3 1 4 2 Starting Point Limitation Circuit ener O 3 5 IMAZ Power Supply Stage ad 3 5 ITAA Auxiliary Voltage Supply eere er eie t ae 3 5 3 1 5 INPUT EF TX 25 PLUS SIII p A EE NAA AEA 3 6 3 1 6 CODER STEREO
40. e The Power supply stage is a switching type Fly back conversion mains direct and converts the rectified main to the 28 5V output The switching frequency is 70KHz The power stage is obtained by the MOSFET Q2 the transformer T1 diode D4 as well as capacitors C7 C6 along with a linear post regulation circuit formed by Q1 C8 C9 DZ5 and the associated components The regulation IC is UC3844 U5 The transformer T1 offers a galvanic insulation between the generated power and auxiliary voltages and the source the output coming from the bridge The stage is intrinsically protected against overloads and short circuits and provides a variety of signals to the General Control board e g the output current obtained by the shunt R6 the output voltage obtained by the output The output voltage 100 Hz ripple is less than 20 mVpp at full load in order to minimize the residual AM modulation The total efficiency conversion stages is 0 75 3 1 4 4 Auxiliary Voltage Supply The transformer T1 supply also the three auxiliary output voltage 15 15 and 5 additional 24 for the fan dedicated The 15 and 15 and 5 voltages are necessary to feed all the chip of the equipment and the additional 24 is dedicated for the fan The circuit is protected against of an over charge short circuit of the output voltages September 2002 Service and Operation Manual Page 3 5 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Softwa
41. e Cte broadcast TX 1000 SR PLUS 1 KW FM TRANSMITTER stereo remote controll head family TX 1000 SR PLUS TX 1000 S PLUS yes no no TX 1000 MR PLUS no yes no Tx 1000 PLUS no no no SERVICE AND OPERATION MANUAL TX 1000 PLUS is the generic name used in this handbook for identify all the variant of the TX 1000 SR PLUS Issued September 2003 Version 1 3 CTE International S r l Via R Sevardi 7 42100 Zona Ind Mancasale Reggio Emilia Italy This document may be duplicated or otherwise used or its contents made known to third parties only with permission of the originator or other authorized people Infringements constitute an offence and are subject to claim for damages All rights reserved for patenting or utility model registration Printed in Italy e Subject to change e data without tolerances typical values CODE 60 CTE International 1000 W FM Transmitter TX 1000 PLUS General information TX 1000 PLUS 1000 W FM EXCITER SERVICE AND OPERATION MANUAL 1 GENERAL INFORMATION CONTENTS 1 4 SAFETY SUGGESTIONS tinte s te beret in etl tet ib edis beo toe miele 1 2 1 2 GENERAL SAFETY RECOMMENDATIONS cnn nennen nennen nen 1 3 13 GOOD PRACTICES Lul ET 1 3 1 4 FIRST AID IN CASE OF ELECTRICAL SHOCK nennen nenn 1 4 1 4 1 EMERGENCY RESUSCITATION TECHNIQUE sse enne 1 4 1 4 2 TREATMENT FOR BURNS titre tte heri e EP ete eet eet hd dan Pr
42. ector the transistor gives an output of approximately 0 5Watts to the Q1 BLF245 transistor which then gives a output power of 25 Watts on all band The RV1 trimmer regulates the drain current when the equipment approximately at 200 mA The low pass filter is elliptic type with minimum inductor shapes Cauer Chebyshev A directional coupler is placed on the output of the filter which gives the tension to measure the direct and reflex power On the same line a signal for an RF Probe is taken at 40dB equalized in band EC2 The U1a and U1d amplify the output DC signal from the D3 C31 D4 C26 rectifiers September 2002 Service and Operation Manual Page 3 4 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description 3 1 4 POWER SUPPLY TX 25 PLUS S3130 The Power Supply is composed by four principal stages 3 1 4 1 Front panel connections Main Filter The on board main filter has the purpose of limiting the emission created by the switching Power Supply and rejected to the main cable and it protects the equipment from over voltages and noise coming from the main line 3 1 4 2 Starting Point Limitation Circuit A starting point limitation circuit limits the spike current when the equipment is switched on At the beginning of this stage there is the general protection fuse which protects all the power supply board The NTC resistor which limits the initial current is RK1 3 1 4 3 Power Supply Stag
43. erature Maximum relative humidity Main supply Dimensions max Weight Max Operating Altitude 2 3 2 MONO OPERATION Audio Response THD 40 Hz to 15 kHz 19 KHz Suppression 2 3 3 STEREO PARAMETERS Audio Filter Attenuation Crosstalk Attenuation Spurios Product 38 KHz Suppression THD on Encoded Channels Audio Response Sub Carrier Generation Pilot Frequency FM 87 5to 107 95 MHz 10 Khz steps 2 blower 12 V 12x12 cm Forced air cooling From 5 C to 45 C From 10 C to 60 C From 0 C to 45 C 90 non condensing 230 Volt 15 Single Phase 50 60 Hz 5 Unit 220 H x 448 W x 600 D mm 42 kg 2000 mt a s l 0 1 dB From 40 Hz to 15 kHz lt 0 1 gt 46 dB gt 50 dB 19 kHz gt 45 dB From 40 Hz to 15 kHz gt 55 dB gt 53 KHz Attenuations gt 50 dB lt 0 1 From 40 Hz to 15 kHz 0 2 From 40Hz to 15 kHz Internal Crystal 19KHz 1Hz September 2003 Service and Operation Manual Page 2 3 CTE International 1000 W FM Transmitter TX 1000 PLUS Features amp Operations 2 3 4 RF CHARACTERISTIC RF Power Output RF Output Impedance VSWR RF Output connector Frequency Control Off Lock Attenuation Type of Modulation Frequency Deviation Stability of Frequency Deviation Variation of Sensitivity for 75KHz Deviation Reference Variation of Centre Frequency RF Harmonics RF Spurious Pre Emphasis AM noise Power Meter accuracy 1000 W 50ohm
44. ews which seat the Power Supply board in the VHF amplifier Replacing the Lexan Keypad LED Unit Unscrew the eight screws near the front handles Unscrew the screw located in the center of the front panel between the air vent and the control panel Remove the front panel only the main chassis with display and control panel will be left in the front of the VHF amplifier Unplug the flat connector which connects the Lexan Keypad LED Unit with the LCD Display Unit Remove the AC Mains Power Switch ad described in Remove the BNC connector from the front panel it feeds the 60dB measure signal from the RF filter unit to the front panel Remove the female to female pass through BNC transition from the front panel by unscrewing the related nut Carefully remove the Lexan Keypad LED Unit it is jammed onto the front panel by means of its adhesive tape Perfectly clean the surface where the old Lexan Keypad LED Unit was jammed in order to ensure a perfect adherence of the new one Peel off the protection film from the new Lexan Keypad LED Unit Stick the new Lexan Keypad LED Unit onto the front panel making reference on the three holes for the BCN transition the RS232 connector as well as the AC Mains Power Switch September 2002 Service and Operation Manual Page 3 41 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description 3 4 RESTRICTIONS FOR FM BROADCASTING TX 1000 PLUS ENGLISH COUNTRY FM Broadcasting De
45. f C7 L2 and L3 The parallel resonating circuit composed of C6 and L2 is calculated so as to lower the value of the 2nd harmonic component generated by the amplifier The gates of the two FET are connected by means R8 R41 and L6 to a polarization circuit BIAS 2 3v The direct voltage on the gates regulated by means the trimmer RV1 The NTC physically located on the case of the active device serves to compensate the variation of the polarization on the basis of the operating temperature Through point 9 connected to the control circuit is possible by means of an appropriate negative voltage to zero the level of output power in the event of operating trouble detected by the RF Control Circuit itself The toroid ferrite cores the output transformer is wound on may be damaged by strong magnetic fields created by current This situation may arise in the event of a FET failure September 2002 Service and Operation Manual Page 3 23 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description 3 2 4 OUTPUT POWER COMBINER VL 1000 PLUS S3110A01 The power coming from the two BL278 stages are sent to the input of one 3dB couplers In output line is placed a directional coupler that detects the reflected power The resistive termination R3 absorb all unbalanced power At the ends of the termination there is a unbalanced detector Both signal are connected the control circuit 3 2 5 RF LOW PASS FILTER VL
46. few minutes in order to allow the internal capacitor to discharge CAUTION After any disassembling removing replacing operation is meant that to restore the original conditions the described operations must be carried out in the opposite order unless otherwise specified CAUTION The normal operation of the amplifier can restored only if all the parts are assembled and connected 3 2 9 2 Adjustments This a description related of each adjustment trimmer available in the amplifier ordered per unit 3 2 9 2 1 PCB S3110A 02 RF Power Amplifier Unit Adjustment Test point function Value RV3 adjusts the gate voltage of Q3 2 3V RVA adjusts the gate voltage of Q4 2 3V RV3 adjusts the gate voltage of Q3 2 3V RVA adjusts the gate voltage of Q4 2 3V Adjustments of PCB S3110A 02 RF Power Amplifier Unit 3 2 9 2 2 PCB K3123A02 RF module control Adjustment Test point function Value RV1 adjusts the protection against excessive SWR 200W RV2 adjusts the unbalance protection ofthe power FETs BLF278 Q1 Q2 400W RV3 adjusts the unbalance protection of the power FETs BLF278 Q3 Q4 400W RVA adjusts the unbalance protection of the power FETs BLF278 Q1 Q4 200W RV5 adjusts the measurement of temperature RF TEMP read on the LCD display Adjustments of PCB K3123A02 RF module control September 2002 Service and Operation Manual Page 3 36 CTE International 1000 w FM Transmitter TX 1000
47. h B Replace the filter or clean it by means of a air compressor Replacing mains AC fuses Remove the two cross head screws marked with E which hold the AC Mains Filter Unit to the rear panel don t remove the four screws which hold the two AC connectors to the filter Slightly extract the AC Main Filter Unit from the rear panel it s not necessary to remove it in order to access the two fuses Replace the fuse F1 mains AC power and or the fuse F2 auxiliary 2A switched output according to their condition Removing the AC Mains Filter Unit Remove the two cross head screws marked with E which hold the AC Mains Filter Unit to the rear panel don t remove the four screws which hold the two AC connectors to the filter Carefully extract the AC Main Filter Unit from the rear panel in order to access the two connectors Carefully unplug the two connectors Remove the AC Mains Filter Unit Removing the Controller Unit Remove the top cover as over stated Locate the Controller Unit and carefully unplug all its connectors Unscrew the four screws which seats the PCB to the chassis Remove the Controller Unit board Dismounting the front LCD Display Unit Remove the top cover as over stated Carefully unplug the two flat cables Unscrew the two exagonal nuts which hold the two LCD display PCBs to the panel Remove the two PCBs together Dismounting the AC Mains Power Switch Remove the top cover as over stated Take down note the connec
48. he default measurement displayed in the upper line of the LCD and to access to a range of visualizations e g the event log and settings half output power switching between front and rear RS232 connectors etc September 2002 Service and Operation Manual Page 3 8 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description 3 1 10 FUNCTIONING OF THE DISPLAY TX 25 PLUS When the equipment is On the display will show the TX model name the software version and the serial number Simultaneously the front panel leds are tested This entire operation lasts approximately 5 seconds TX 25 PLUS V 1 05 N The frequency and power will then appear on the display Each time any of the 3 buttons on the front panel are touched the display will remain lit for 30 seconds FREQ 107 95 MHz FWD 25 5W LC The enter button gives access to the main menu which is divided into 5 headings To exit this menu you must move to the EXIT option and press ENTER You will otherwise pass on to the sub menu September 2002 Service and Operation Manual Page 3 9 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description 3 1 11 DETAILS OF EACH MENU TX 25 PLUS This menu reads all the measures of the equipment which are displayed in groups of two at a time By pressing the buttons UP or DOWN you pass on to the two previous or following measurement
49. heres to the skin and leave it in place Keep the patient covered except the injured part since there is a tendency to chill v Splint all fractures Violent muscle contractions caused by the electricity may result in fractures Never permit burned surfaces to be in contact with each other such as areas between the fingers or toes the ears and the side of the head the undersurface of the arm and the chest wall the folds of the groin and similar places Transport to a medical facility September 2003 Service and Operation Manual Page1 5 CTE International 1000 W FM Transmitter TX 1000 PLUS General information 1 5 WARNING INSTRUCTION 1 5 1 INTRODUCTION The transmitter or the equipment that this manual is referred to is developed produced and tested following the relevant safety standards EN 602125 The following safety instruction advice the operator about the dangerous operation concerning the equipment The user must be read the safety instruction contained in the manual and they must follow them As mentioned on the safety rules qualified technical staff only can operate this equipment CTE declines any responsibility for damages caused by an improper use or improper setting up performed by inexperienced staff not qualified or operating with instruments or tools not in compliance with safety set of rules The staff in charge besides being technically qualified must be trained in first aid in case of emergency
50. him or his clothing until free of power 1 4 1 EMERGENCY RESUSCITATION TECHNIQUE Step 1 Check the victim for unresponsiveness If there is no response immediately call for medical assistance and then return to the person Step 2 Position the person flat on their back Kneel by their side and place one hand on the forehead and the other under the chin Tilt the head back and lift the chin until teeth almost touch Look and listen for breathing Step 3 If not breathing normally pinch the nose and cover the mouth with yours Give two full breaths The person s chest will rise if you are giving enough air Step 4 Put the fingertips of your hand on the Adam s apple slide them into the groove next to the windpipe Feel for a pulse If you can not feel a pulse or are unsure move on to the next step September 2003 Service and Operation Manual Page1 4 CTE International 1000 W FM Transmitter TX 1000 PLUS General information Step 5 Position your hands in the center of the chest between the nipples Place one hand on top of the other Step 6 Push down firmly two inches Push on chest 15 times CONTINUE WITH TWO BREATHS AND 15 PUMPS UNTIL HELP ARRIVES 1 4 2 TREATMENT FOR BURNS Continue treat victim for electrical shock Check for points of entry and exit of current Cover burned surface with a clean dressing Vv Vv V WV Remove all clothing from the injured area but cut around any clothing that ad
51. irst pilots the transistor Q6 BFR106 which gives a power of approximately 10dBm The second is for the input of the internal prescaler to U4 LMX2306 This circuit has integrated all the synthesis functions and is programmed by a microprocessor U23 M30620FCAFP located on the controller board The frequency reference is produced by U3 which is a TCXO with 12 8 Mhz output The error amplifier is composed by a pair of operational U1a U1b TLO72 The circuit composed by the U2 LM358 IC that gives the micro a low signal and then the PLL is correctly connected All the circuit has been adequately screened to avoid emissions of illegitimate frequencies 3 1 3 POWER AMPLIFIER TX 25 PLUS S3131 The power amplifier is assembled to a radiator and to avoid illegitimate signals it is screened by using a hood The interface with the controller board is made by means of two connectors EC2 EC4 The Q1 BLF245 transistor has direct power supply of 28V from the switching power supply EC5 connector The driver power circuit low pass filter and directional coupler are all on the same PC Board To avoid calibration during the quality control the coils in all of these circuits have been replaced with micro strips The driver is composed by the Q2 BLT50 transistor with a micro which controls the tension of the power supply and an AGC The RV2 trimmer regulates the VCE of the equipment with approximately 6 5V With only 10 dBm on the EC1 SMB conn
52. is wide band and able to give a variable output power from 0 5 to 1000W which is controlled by a RF AGC The directional coupler has a directivity of approximately 28dB and has a 40dB probe RF The power supply switching is managed by a network with fly back configuration The input tension may vary from 90 and 265 Volts and may have a frequency of 50 60 Hz There are four output tensions All the data is visualized on the LCD panel on the front panel while the commands are set by using the three buttons The transmitter interfaces with a Pc modem GSM module and other systems which use the same communication protocol through two RS232 ports and one RS485 port See block diagram September 2002 Service and Operation Manual Page 3 3 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description 3 1 2 VCO SYNTHESIS TX 25 PLUS S3134 The synthesis circuit is located on the control board and is connected by EC3 EC4 connectors which allow it to be easily replaced The operating frequency is from 87 5 to 107 95 MHz The oscillator which is the main part is composed by Q3 BFR93A D2 D3 D8 D9 D10 D11 and the coils L6 L7 form the tanks and bring about the modulation of the oscillator The transistor Q4 BC847B is a capacity multiplier which reduces the flickers noise which reaches the power supply The U5 IC Max 2471 un couples the oscillator from the next stages and gives two outputs The f
53. it possible to load the new versions of the software on board by using the EC7 connector and the circuit supplies upon client request The U25 IC manages the clock date function and on the EC12 connecter the clock signal is available together with the tension of the back up battery In case of blackout the U29 IC St93C86 saves on the memory all the set data External communication with the GSM and the RS232 occurs with the aid of the U20 DS14C232 IC and U9 DS14C232 IC while the IC U24 DS75176 serves the RS485 The IC pair U28 LM336 and U34b allows the interface between the temperature sensor located on the power amplifier and input of the microprocessor The reading temperature figure on the display is regulated through the trimmer RV6 The ntegrated circuit U26a and U26b LM358 supply the DC voltage regulated by the trimmer RV4 and RV5 for the visualization of the voltage and current value of the power amplifier stage The transistors Q1 Q3 Q7 Q9 Q10 Q15 are the logical translator from 5V to 8V for the several functions preemphasis L F L Mono Stereo The integrated U2 and U8 are the voltage stabilizer of the 8V tension of feeding of coder the stereo The relative DC voltage of the forward power and the reflected power coming from the directional coupler connector EC10 are opportunely amplified from U21a b and regulated through trimmer RV3 and RV2 before entering in microprocessor On the EC10 are also captures the DC signal
54. mers RV3 When the temperature level of the heatsink reaches the intervention level 80 C the temperature chip sensor at the center of the same heatsink transmits a signal to the microprocessor that switch of the Amplifier The constant current generator formed by transistor Q3 and surrounding components is feeding the diodes D4 and DZ1 and between their terminals always offers a voltage of 10V This is the polarization and the control voltage of the basic module The previous described are lead through D7 coming into the basis of the Darlington pair Q1 and Q2 in case of intervention can regulate the control voltage to al level of about 12V which totally cutoff the output power of the module If the control voltage 15V auxiliary supply fail the general control by means the microprocessor switch off the amplifier September 2002 Service and Operation Manual Page 3 24 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description POWER SUPPLY VL 1000 PLUS K3113C01 The Power Supply is composed by four principal stages 3 2 6 1 Front panel connections Main Filter It consists in a board which is separate from the Power Supply and located in the internal side of the rear panel The main filter has the purpose to limit the emission creates by the switching Power Supply and rejected to the main cable and it protects the equipment from overvoltages and noise coming from the main line 3 2 6 2 S
55. n OFF positions and the mains line cable is connected If itis really necessary and after authorization of CTE very qualified technical staff only can work with on live parts In this special case special safety precautions must be taken CTE declines any responsibility if any safety rule is not respected The replacement of the accessible fuse must be made with the transmitters turned off and using a fuse with the identical characteristics only as specified by the manufacturer September 2003 Service and Operation Manual Page1 6 CTE International 1000 W FM Transmitter TX 1000 PLUS General information 1 5 5 WARNING SYMBOLS The following symbol are used on this equipment to advise the user about the most important dangerous parts DANGER SHOCK HAZARD PE TERMINAL WARNING TOXIC HAZARD THESE DEVICES CONTAIN BERYLLIUM OXIDE OBSERVE SAFETY INSTRUCTIONS Certain devices for example the RF final circuits MOSFETS contain Beryllium Oxide BeO these components must not be broken crashed or heated This oxide passes through the common systems of filtering including the respiratory apparatus The prolonged inhalation at high degrees causes poisoning with respiratory apparatus paralysis until death September 2003 Service and Operation Manual Page 1 7 CTE International 1000 W FM Transmitter TX 1000 PLUS Features amp Operations TX 1000 PLUS 1000 W FM EXCITER SERVICE AN
56. nscrew the six exagonal side screws which hold the RF Unit in place Please note that the central inner screw fixes the power supply voltage negative wire Loose the only the upper screw located on the rear panel marked with B1 it s not necessary to loose the lower screw marked with B2 Loose the two big pass through screws located on the rear panel marked F and G Just loose them not remove otherwise the RF filter can fall down Unscrew the N type connector between the RF Unit and the RF Filter Unit Carefully extract the RF Unit toward the front taking care not to damage the RF input cable CAUTION 4 To restore the RF Board Unit in place strictly follow the dedicated paragraph Do not carry on the over stated steps in the opposite order 11 Removing the RF Filter Unit Perform the over stated steps to remove the RF Board Unit apart the last step Slightly extract the RF unit toward the front just for 10 centimeters approx in order to access the RF filter unit Completely remove the hexagonal screw B1 and two big pass through screws F and G described at steps 9 and 10 in the previous paragraph Remove the RF angle connector which feeds the 60dB measure signal from the RF filter unit to the front panel Remove the RF Filter Unit To open the RF Filter Unit simply unscrew the twelve screws which fix its cover Should you just need to perform a control of the RF Filter board you can just unscrew the screws stated at step 6 withou
57. only 3 dB 250W 3 2 7 7 Function 3dB This function allows to set the equipment s output power at 3 dB the half of the rated full power September 2002 Service and Operation Manual Page 3 28 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description 3 2 8 MENU COMMANDS 3 2 8 1 Start Up Condition At the start up the name the version and the serial number of the equipment appear on the LCD display Simultaneously all the LEDs will be tested de i t amp DC OUT ALC VSWR ALARM POWER At the end of the start up the Main Menu will be visualized It is composed by two lines The upper line shows the default measurement Dir Pow Which is the RF Output Power and is followed by its value This measurement can be changed by the menu according to your need The second line is the status of the equipment Normal if all is going well 3 2 8 2 Menu Description By entering the menu it s possible to change the default measurement displayed in the upper line of the LCD and to access to a range of visualizations e g the event log and settings half output power Switching between front and rear RS232 connectors etc 3 2 8 3 Navigation commands At the right of the LCD display there is an asterisk K which indicates the selected menu item The two keys O and allow respectively to scroll the menu up and down in order to select the various menu items E Note the menu scroll fun
58. or accident reanimation heart massage mouth to mouth respiration etc Before going on with the operations to be performed it is necessary to know the position of the general electric switch and the one of the extinguishers which have to be used very quickly if necessary 1 5 2 CHECKING OF SAFETY CONDITIONS The following connection and verify must be observed to guarantee the safety for the personnel e Correct connection with the antenna cable e Correct connection with a mains line cable e Correct connection with a ground cable EARTH CONNECTION e Verify that the ambient where the equipments is installed is in compliance with the specification declared by the manufacturer altitude humidity temperature e 1 5 3 AC DC LINE WARNING This equipment is working with dangerous high voltage and current Any voltage present inside this equipment can be potentially dangerous for personnel The technical staff designed for the service and repair operation must be qualified and they must take the appropriate safety measures stated on safety rules 1 5 4 SERVICE and OPERATIONAL WARNING The technical staff in charge of the service operations inside the equipment with any cover removed must check that the mains line is disconnected After the service operation is completed the cover must be correctly mounted before the connection with the mains line The high voltage is present on the mains stage of the equipments also when the mains switch is i
59. portional to the square root of the ref power 4V 5W 3 NO alarm contact 4 STAND BY command line activated by short circuiting this line with GND 5 Common alarm contact 6 GND 7 Signal which is proportional to the square root of the direct power 8V 25W 8 NC alarm contact the contact is NO in normal operation 9 15Volts Output September 2003 Service and Operation Manual Page2 9 CTE International 1000 W FM Transmitter TX 1000 PLUS Features amp Operations 2 4 4 REAR VIEW AMPLIFIER eme e Gus Ha e ume e E Ue Number Description 1 RF input connector connect to this input the output of the exciter as per the following directions 2 Right rear handle use it in combination to the left handle to move the amplifier it also fixes the rear panel 3 RF output connector connect this output to the antenna as per the following directions 4 Fans they provide the air flow necessary to the RF amplifier cooling 5 Ground terminal general ground terminal 6 Left rear handle use it in combination to the left handle to move the amplifier it also fixes the rear panel 7 AC power input plug connect the AC mains supply voltage as per the following directions September 2003 Service and Operation Manual Page 2 10 CTE International 1000 W FM Transmitter TX 1000 PLUS Features amp Operations 2 4 4 1
60. re description 3 1 5 INPUT LF TX 25 PLUS S3132 The L F circuit is designed to manage different types of input signals It interfaces with the controller through the EC5 connecter This circuit has a Right Mono and Left MPX inputs on two 3 pole female cannon connectors and two SCA inputs with BNC connectors The Right Mono and Left MPX signals are filtered through the RF noise filters and pass in U1a and U3a The R26 and R31 trimmers regulate the gain of the signal with excursion which goes from 6 to 12dBm The input impedance can be selected on 600 ohm or on 10Kohm by regulating the S1 and S2 switches The option setting menu enables the setting of the input attenuator with fixed value at 0 to 6 and variable value 6 12 In fact the U2 U4 IC are digital switches The U1b and U3b LM833 buffers send the signal to the controller The R10 and R12 trimmers regulate the gain of the SCA input signals and the U5a and U5b LM833 buffers send the signal to the controller In this circuit are also located the RS232 EC3 connecter and two male female connectors for the RS485 EC1 EC2 The remote connecter EC4 of the transmitter enables the use of analogue signals to read several parameters and logic signals to give alarm and stand by signals 3 1 6 CODER STEREO TX 25 PLUS S3133 The stereo coder is located on the controller board and is connected to it by using EC1 and EC2 connectors The frequency reference is obtained through
61. res e g overheating excessive SWR etc After 8 failures the amplifier will be switched in stand by mode R24 means that the counting of the failure counter is reset each 24 hours The detailed description of all these setting is stated in the next paragraph in which is explained how to change such these settings and other ones 3 2 8 6 3 Setting submenu The submenu Setting allows to change each of the various available settings Part of them can be seen in one screen shot as described in the previous paragraph This submenu is protected by a 3 digits password which is stated in the red Code Card label attached to the amplifier The password can be uninhabited by an internal jumper plased on the general control board After entering in this submenu you will be prompted to enter the password Display First line Password Second line 00 00 00 2 The cursor will be already positioned on the Ist digit and set to 1 By means of the O and keys you can increase or decrease that figure w Press the key to enter the Ist digit Repeat steps b and c for the other two digits of the password 5 If the password will be correct the display screenshot will be recalled however by repeatedly AR pressing the O and keys the settings will be available as well according to the following table September 2002 Service and Operation Manual Page 3 34 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit
62. rvice and Operation Manual Page 2 1 CTE International 1000 W FM Transmitter TX 1000 PLUS Features amp Operations 2 1 INTRODUCTION TX 1000 PLUS is a modern FM broadcasting transmitter which produces an output radio signal with high characteristics of quality The TX 1000 PLUS iscomplete FM Transmitter developed connect the FM Mono MPX Stereo Exciter TX 25 PLUS with the VL 1000 PLUS in the same mechanical All printed circuits are to surface mounting technology component assembling The transmitter of simple and rugged construction is able to satisfy the requests of all those end users looking for top quality equipment at reasonable prices 2 2 PURPOSE This manual contains information and reference documentation on installation operation and maintenance of the TX 1000 PLUS transmitter e Weighs only 42 Kg for easy moving and maintenance e Better operation temperature of the equipment thanks to the air filter placed on the front panel and to the optional air convey to be placed in the rear part of unit e Impressive number of utilities controls and data with local or remote record facility e High quality price ratio September 2003 Service and Operation Manual Page2 2 CTE International 1000 W FM Transmitter TX 1000 PLUS Features amp Operations 2 3 TECHNICAL SPECIFICATIONS 2 3 1 ENVIROMENTAL Operating frequency range Cooling Operating temperature Storage temperature Guaranteed Performance Temp
63. s By using the ENTER button from any sub menu you return to the Measure menu The specific readings are 1 Modulation measure The first line shows a measuring bar VU Meter type whose value increases and decreases according to the variation made on the L F input signal The second line shows the modulation value in digits and it also varies with the L F signal 2 Direct power and reflex power In this case the forward power and reflected power of the equipment are displayed 3 Voltage and current of the power module In this case the figures will vary according to the input voltage This measure gives a voltage reading within the range 1 1V to 33 5 and from 0 1A to 3A for the current 4 Frequency and temperature reading The frequency reading shows the setting of the programmed PLL through the use of the Up Down and Enter buttons in the SETTING section The temperature is displayed in the range from 20 C to 99 C 5 Reading ofthe clock and date This sub menu displays the current time and date September 2002 Service and Operation Manual Page 3 10 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description Graphic summary ofthe MEASURE menu September 2002 Service and Operation Manual Page 3 11 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description 3 1 12 MENU EVENT LOG TX
64. t removing the filter 12 Restoring the RF Board Unit Insert the RF Board unit in the slot of the front panel and locate it at the middle position approx Track the RF input cable inside in a path between the two fans and carefully move it to the left toward the female to female N type pass through transition fixed on the rear panel to which it should be connected Carefully slide the module toward the RF Filter Unit and slightly start to screw its N connector just to hook it on the RF Filter s one Push the RF Board Unit completely onto the RF Filter Unit Screw completely the three screws which fix the filter to the rear panel and check that the RF Filter is perfectly and steadily fixed Screw perfectly the N connector in order to ensure the perfect RF connection between RF Board Unit and the RF Filter Screw the six side hexagonal screws described at step 8 of 0 ensuring that the central inner screw perfectly fixes the power supply voltage negative wire Perform in reverse order the steps from 2 to 7 described in 0 September 2002 Service and Operation Manual Page 3 40 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description 13 Removing the Power Supply board Remove the bottom cover as over stated Unplug the connectors which connects the two fans the negative and positive power supply voltage the Control Unit flat cable and the AC mains supply six connectors in total Unscrew the nine scr
65. tarting Point Limitation Circuit A starting point limitation circuit provide to limit the spike current when the equipment is switched on At the beginning of this stage there is the general protection fuse F1 which protects all the power supply board The resistor which limits the initial current is R103 this resistor is further short circuited by the relay RL1 for the normal operation the short circuit becomes operating in less than 1 second the time necessary to charge the capacitors this time is defined by an RC circuit 3 2 6 3 Power Supply Stage The Power supply stage is a switching type double conversion mains direct The first stage conversion is AC DC it transform the 230V alternate signal into a 400V direct signal The Switching frequency is 40KHz The circuit which provides the first conversion regulates the power coefficient of the 230V main line current absorption the power coefficient at full charge isn t less than 99 The power factor control PFC is obtained by the dedicated IC UC3854 U5 and related circuitry P1 e P2 the IGBT transistor Q4 the inductor L1 diodes from D1 to D4 and capacitors from C8 to C11 This configuration offers a very effective protection against input overvoltages which are absorbed by the inductor L1 as well as the capacitors from C8 to C11 additionally increasing the reliability of the mains direct switching regulator The second conversion stage has a DC DC half bridge structure it transforms
66. the direct voltage from 400V to 48V insulated from the mains line The switching frequency is 40KHz The Power Supply is protected of an over charge short circuit of the output voltage and by means the General Control it is protected of the overheating The IC which provides the regulation of the half bridge stage is U4 SG3525 The half bridge is obtained by means of the IGBT transistors Q1 and Q7 by the capacitors C1 and C12 as well as the transformer T3 which offers galvanic insulation from the mains supply The rectifying diodes are D9 D10 D17 and D22 The first filter cell is made by the inductors L4 and L7 as well as the capacitors C15 and C17 while the second filter cell is obtained with L5 and C19 The second DC DC conversion stage is intrinsically protected against overloads and short circuits and provides a variety of signals to the General Control board e g the output current obtained by the shunts from SH1 to SH4 the output voltage obtained by the output a signal which is proportional to the operating temperature IC LM335 RK1 which is fixed to one heatsink nearby the diode D38 The second DC DC conversion stage also receives the ALC feedback signal coming from the control board by means of L9 and R57 to the IC U2 changing the power supply voltage in order to keep constant the RF output power In case of overheating the board acts on the opto insulator U6 with a ST BY hi level signal which locks the two stages U5 e U4 SG3525
67. tion of the four colored wires brown blue 2 gray wires and unplug their Faston type connectors from the switch Press the two tabs inward which fix the switch to the front panel and keep them pressed Press the switch toward the front panel and remove it CAUTION 3 When restoring replacing the new switch take care to observe the wiring connections as noted at step 2 September 2002 Service and Operation Manual Page 3 39 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description 10 Removing the RF Board Unit Remove the top and the bottom covers as over stated Before going on please remove the cover ofthe RF Board Unit accessible from the top by unscrewing all its screws this operation is mandatory otherwise the RF Unit can t be extracted Remove the nine screws near the front handles marked with A Remove the screw located in the center of the front panel between the vent grid and the control panel marked with A1 the front panel will be free Remove the front panel only the main chassis with Display Unit and Keyboard will be left in the front of the VHF amplifier Remove the internal N type male connector from the female to female pass through transition fixed on the rear panel which makes the RF IN connector Remove the side power supply connector the one with four red wires the side flat cable coming from the Control Unit as well as the 4 wires connector coming from the RF Filter Unit U
68. ts the signal when the over modulation reach 110 Khz The clipper circuit can be excluded buy the S1 jumper The final result audio signal is connected to synthesizer circuit through the EC1a connector The level of the modulation is regulated by RV7 The double half wave rectifier composed by U22 U18 U30 eU16 gives the September 2002 Service and Operation Manual Page 3 7 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description microprocessor the DC voltage level to visualise the modulation value on the display The level is regulated by the trimmer RV11 The three relay RL1 RL2 RL3 provides the contacts for the alarm and stand by remote see dedicated description The connector EC9 allows the interface by the micro with the front panel keyboard and display 3 1 8 START UP CONDITION TX 25 PLUS At the start up the name the version and the serial number of the equipment appears on the LCD display Simultaneously all the leds will be tested O O LOCK ALARM POWER At the end of the start up the Main Menu will be visualized It is composed by two lines The upper line shows the default measurement Fwd Pow which is the RF Output power and is followed by its value This measurement can be changed by the menu according to your need The second line is the status of the equipment Normal if all is going well 3 1 9 MENU DESCRIPTION TX 25 PLUS By entering the menu it is possible to change t
69. viations from ERC Deeisions BEN WENN ANI DENMARK Ye ta cene reni FINLAND Ve invite et Individual licence is eae Individual licence is required Individual licence is required ITALY Individual licence is ts XEMBOURG Va vat i ed NETHERLANDS Individual licence is Zr SWEDEN Indien reni O SWITZERLAND Yes mee O UNITED KINGDOM Individual licence is required ITALIAN STATO Introduzione FM Restrizioni all uso Broadcasting RORVEGIA s enaa OLANDA SI Re smile 1 Richiesta la licenza individuale PORTOGALLO Soo Erik Richiesta la licenza individuale EA SVIZZERA Richiesta la licenza individuale September 2002 Service and Operation Manual Page 3 42 CTE International 1000 w FM Transmitter TX 1000 PLUS Circuit and Software description FRANCE PAYS FM Broadcasting Correction de la directive ERC DO mem mm 0 O on rte Licence individuelle demandee eRECE di Times invite demand IRLANDE O4 did demand RORVEGE ow A III Licence individuelle demandee PORTUGAL Da Td sup Si Temi mne ESPANIOL PAIS FM Broadcasting Restricciones al uso introducida y otros comentarios ALEMANIA NM Requiere licencia individual AUSTRIA Requiere licencia individual ee licencia individual RS ESPA A DST Run cenci iii LUXEMBURGO ST estat NORUEGA 8 Rd PORTUGAL S Rees coca india Su cd SUI

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