USER MANUAL - Fmuser FM Radio Station, Television Statioin, low
Contents
1. A Connect this input with a 50 ohm RG58 cable up to 3 39 meters distance if the distance exceeds several tens of meters use 75 ohm RG5QY 92 ohm RG62 cables The auxiliary channel connector also of the BNC female type is ground as usual Use 50 ohm RG58 or 75 ohm RG59 cables to connect to the driver LF input level range setting and requirements In the following paragraph we will refer to dBm as the audio signal which produce 1mW 600 ohm 775mVrms 2200 mV pp sine Irrespective of the impedance we will continue to assume OdBm as a LF signal whose peak is or 1100 mV www fmuser org In the same way when discussing the modulation we will assume a OdB signal produces 100 maximum modulation i e 75 kHz deviation There is no absolute world wide standard regarding LF peak level as a modulation signal for a transmitter nor for the mean deviation Many Broadcasters use O or 6 dBm as LF peak level for 100 modulation USA often uses 10 dBm Many European countries specify 6dBm for 40 kHz deviation which is assumed to be a mean modulation This allows for 5 5dB headroom to max 75 kHz deviation i e 11 5 dBm Higher level audio inputs and ambient noise High levels will stress the input circuitry of the transmitter reducing the dynamic distortion free range over the nominal level headroom It will also reduce the quality of audio For this reason we recommend2. stereo mono press the key this will advance the selection to PR change the pre emphasis by pressing either A Y keys now press the gt key the blocks will advance to LIM the units on board limiter to make changes press the WV keys press the gt key once more and it will highlight the L R Audio input level use the WV keys to select the audio level now press the gt key once more the blocks advance tothe A section Auxiliary Channel againusethe A WV keys to make your selection Once finished remember to press SET for 3 seconds for the new parameters to be saved to the units memory The digital menu display system is very easy to understand and you will become familiar with its functions very quickly www imuser org LF CONNECTION Pre emphasis setting PR Low frequency and stereo channel signals have to be adequately pre emphasized For this purpose select the setting PR and choose 25 50 and 75us Factory preset is 50us Europe Pacific South America USA requires 75us When using an external processor that employs pre emphasis you must set the to If you need to alter the setting select and adjust the PR to the required parameter AAA AAA BAA QAR QR LF wiring and impedance selection The STL10 Series supports balanced unbalanced signals with se
3. whenever possible to adopt a 6 10 dBm as nominal peak level for audio modulation purposes The 57110 Series transmitters allows an input level range the main channel of 9 6 dBm to be set for 100 modulation with almost no difference in modulation performances if a high quality signal is provided Even at the higher level 6 dB minimum headroom is allowed i e up to 150 kHz deviation with no distortion Obviously this deviation is not currently allowed by the broadcast standards and the limiter threshold must be set at its maximum to permit undistorted performance The auxiliary channel s gain lies within 6 and 24 dB with respect to O dBm and 100 modulation this input s maximum applicable level is dBm 775 mV rms Typical input levels for an SCA type signal 10 max admissible deviation may lie in the 9 to dBm range 245 775 mV rms 696 2200 mV pp when the gain is set between 9 dB Typical input levels for an RDS type signal max admissible peak deviation 2 kHz may lie in the 21 5 to 11 5 dBm 185 585 mV pp ranges when the gain is set between 9 dB as above The nominal input level to O dB modulation may be set with good precision on audio stereo composite channels by change the gain to reach the wanted level www fmuser org The auxiliary channel level is much more difficult to be precisely set due to the wider range of the continuously variable control 18 dB vs 4 dB Nevertheless dB co
4. 5W MAX 250W MAX 50 ohm Type N female 0 0002 0 C to 50 C 60 dB below maximum carrier power 0 1 dB or better 50 Hz to 53 kHz 0 3 dB or better 30 Hz to 100 kHz the 3 dB roll off is approximately 220 kHz gt 55 dB at 1 kHz modulating frequency 0 02 75 usec de emphasis 80 dB below 75 kHz deviation 75 usec de emphasis 50 dB or better 60 dB or better Stereo channel and MUX input for RBDS SCA or MUX Composite 3 Vp p into 2k ohms for 50 kHz deviation BNC and XLR 90 264VAC 127 370VDC Full range universal input 10 to 45 483 x 89 x 400 mm rack std 19 2U STL10 25W 483 x 132 5 x 400 mm rack std 19 3U STL10 250W 6 5 Kg STL10 25W 16 5 Kg STL10 250W TECHNICAL CHARACTERISTICS for RECEIVER Frequency RF Input Connector Stereo Total Harmonic Distortion Crosstalk Mux to Main Signal to Noise Operating temperature range The same with transmitter above Type N Female 50 ohm 30 mV for 60 dB SNR 400 mV for 80 dB 50 dB at 1 kHz 40 dB or better at other frequencies 0 05 with 75 usec de emphasis 50 dB or better 75 dB with 75y sec de emphasis at maximum deviation 85 264V
5. AC 120 370VDC Full range universal input 10 to 45 483 x 89 x 320 mm rack std 19 2U 5 Kg www fmuser org FRONT PANEL All FMT Series digital front panels are pretty similar they all carry the LCD display and function keys for operation control The power on switch with internal mains signaling lamp is on the right www fmuser org REAR PANEL CONNECTORS AUDIO INPUT 90 264V AC EXTERNAL 50 60 Hz 80VA RIGHT 2 10 100000 Hz OUTPUT AUX 50 OHM Nw FUSE 3A 250V 20 100 KHz N AUDIO OUTPUT MONITOR 90 264V AC 50 60 Hz 80VA RIGHT ANT FUSE 3A 250V 20 100 KHz EARTH All STL input and out put are allocated on the rear panel They are The audio channels sockets on balanced female XLR type connectors The wide band external processed stereo composite signal input output on a grounded unbalanced BNC connector The low frequency limited 20k 100kHz2 auxiliary channel input on a grounded unbalanced BNC connector for transmitter The RF antenna connector N type The hot center pin on the EXTERNAL BNC input in physically in parallel with the signal input pin3 on the mono right channel XLR socket For this reason both connectors cannot be used at the same time This panle also carries the IEC type mains socket with fuse and an earth screw for system earthing besides the ground ping on mains socket www fmuser org I
6. NSTALLATION AND USE STL TRANSMITTERS FOREWORD TO INSTALLATION Install the transmitter in a dry vented dust free environment with a mean temperature of 10 35 C Do not install on surfaces or racks subjected to vibrations external vibrations can impair S N ratio Connect your audio source using suitable cables and connectors The STL10 Series audio circuitry is similar to hi fi equipment and should be installed and wired with the same attention avoid earth loops as much as possible When these conditions are met the transmitter will deliver excellent audio characteristics The STL10 Series are fully RF shielded and can be installed close to the production studio this type of installation allows constant monitoring of audio levels deviation and power parameters The transmitter can also be installed in other locations away from the studio and connected with several meters of LF co axial cables with no adverse effect on modulation quality Remote installation usually requires STL Studio to Transmission Link equipment Final modulation performance is based upon the system installation give careful consideration to where you will locate the transmitter Additional advices are given in the appropriate paragraphs in this manual to assist you to achieve an optimum environment www fimuser org RF CONNECTION Connect the N type output connector marked RF OUT to the antenna system with top grade 50 ohm shielded cable Note Alt
7. OF PAYMENT 3 1 Invoices are drawn up on the date of delivery They should be paid in full within 30 calendar days of the invoice date Payment may be made by bank draft subject to our acceptance transfer or change 3 2 The order shall only be completed on a 100 advanced payment by a direct swift to D amp M bank Except specific term mentioned in the quotation 3 3 Failure to make payment on the scheduled date shall result in a demand for payment of all other outstanding payments Furthermore all overdue payments shall automatically give rise after formal notice to the payment of interest for overdue payments which shall be calculated at a rate equal to one and a half times the legal rate of interest Failure to pay may result in D amp M suspending or canceling the delivery of orders in progress and reclaiming any goods already supplied In this case D amp M shall retain the deposit paid by the purchaser by way of contractual compensation Furthermore all costs incurred in recovering moneys owing in addition to any legal expenses shall be borne by the purchaser 3 4 Advance payment does not give entitlement to discount 4 PACKAGING AND TRANSPORT 4 1 Packaging costs are included in the price 4 2 Carriage costs and any taxes in the country of final destination shall be borne by the purchaser 4 3 All our goods are carried at the risk of the purchaser who shall check the condition of the delivery before issuing a discharge to the f
8. Y keys to change frequency press and hold for fast forward for fine tune press and release You can select any frequency in 10 kHz steps tim 1s Once you have set the frequency use the lt gt keys to change to the next parameter This will display the output power PS with the PS in 0 blocks use the Y keys to set the power from zero to maximum Power output is displayed as FWD reflected power is displayed as REF Correct operation will be within a range where the reflected power should be less than 10 of the forward power In the event your reflected power exceeds 10 you should immediately inspect all connections coax cable feed line antenna connection or antenna match tune Check the transmitter s maximum output power does not harm the downstream amplifier stage if any If needed set output power to the minimum Once you have finished setting the frequency and power press SET for 3 seconds again this will save your new settings to the unit s memory All parameters will be saved even during a power outage or reboot www fmuser org Usethe A W keys to move the next display parameter Next we will repeat the setup mode in the audio display press SET for 3 seconds or until you see the blocks blocks will be in MODE area Use the A WV keys to change from Stereo to Mono when you have selected
9. ation to pay shall not be deemed to constitute payment 7 DRAWINGS AND PRELIMINARY DESIGNS D amp M retains full intellectual property of its designs which may not be communicated to others or executed without its written authorization 8 INDUSTRIAL AND INTELLECTUAL PROPERTY 8 1 Except where authorization is given documentation and software shall not be copied or amended translated or adapted into any other software language or foreign language by the purchaser However the purchaser may make 2 copies for filing purposes and for the replacement of a defective copy 8 2 Should the purchaser be sued in relation to a product supplied by D amp M on grounds of breach of an industrial or intellectual property right held by a third party D amp M shall assume responsibility for the defense case at its own cost shall conduct the proceedings and shall pay any damages awarded to the said third party This commitment is subject to the obligation upon the purchaser to inform D amp M immediately in writing of any claims lodged and to leave D amp M free to reach a compromise 8 3 Purchasing products from D amp M does not imply the grant of rights under any patents of third parties by license or otherwise If the purchaser is not yet licensed he shall approach administrator as the case may be in order to apply for a license if it is necessary 9 WARRANTY AND LIMITATION OF LIABILITY 9 1 The parts and any workmanship commissioned by D amp M
10. ders shall imply acceptance of the general conditions laid out herein below Where differences arise between the general conditions and the specific conditions stipulated in price quotations the latter shall prevail No amendments to the present conditions shall be valid without written approval from D amp M 1 ORDERS 1 1 Orders placed with D amp M must be sent either in writing or by fax followed by written confirmation within eight days 1 2 Like price quotations any exchanges of information between D amp M and the purchaser shall not constitute a contractual agreement The sales agreement shall not be binding on both parties until receipt of the purchaser s order 1 3 The cancellation or interruption of an order shall only be valid with the consent and written approval of D amp M Where cancellation is accepted the purchaser shall be liable for payment of compensation which must cover the total amount of costs already incurred In all cases the said compensation shall amount to at least 30 of the total sale price 2 PRICES 2 1 The prices indicated in all price lists or quotations shall be given in USD exclusive of V A T and any other tax except different specification in the quotation 2 2 Prices are final and shall not be subject to revision on condition that the order is placed before expiry of the period of validity indicated on the quotation Except where otherwise stated this period shall be 30 days 3 CONDITIONS
11. e Do not use solvents that may damage the paint surface markings or lettering Maintenance personnel must not remove unit covers without taking required protective measures Any manipulation must always be carried out by qualified or maintenance personnel Appropriate precautions must be taken even when the unit has been disconnected the inside of the unit may still have a dangerous voltage level 1 MAINS VOLTAGE MAY KILL www fmuser org TECHNICAL SPECIFICATIONS TECHNICAL CHARACTERISTICS for TRANSMITTER Frequency Output Output Frequency Stability Spurious Signal Emission Base band Frequency Response Stereo Total Harmonic Distortion Signal to Noise Nonlinear 5 Sub lt Modulation Capability Modulation Input Levels Input C Mains power supply requirements 1 Operating temperature 0 200 00 to 220 MHz 240 to 260 MHz 300 to 320 MHz 320 340 MHz 400 to 420 MHz 460 to 470 MHz or other frequency on demand 2
12. hough most 50 ohm specified cable has enough power management capability its power attenuation can be too high and may excessively lower the power available to the antenna For this reason use only low attenuation type cable we suggest RG213 cable or in certain applications where the power is over dimensioned or the cable length is small RG58 cable can be used Times Microwave Cell Flex Andrews all manufacture high quality low loss coax POWER UP 1 Connect transmitter to mains check the ground switch on Menu will display the model and firmware version Our ODM Series will display the customer s information If this is the first boot or you need to change the systems configuration select No by pressing the gt button If no changes are made the unit press the set button unit will perform a 10 second internal self test once complete the LCD will look like this www fmuser org Initially the PLL requires sometime to lock onto your frequency During this phase the LCD will display UNLOCK and INH PLL UNLOCK alarm Once locked onto your frequency the display will show LOCKED and NORMAL STATE At this point the transmitter will begin delivering power to your antenna www fmuser org SETTING FREQUENCY AND TRANSMIT POWER From the main menu press SET for 3 seconds the LCD will display the setup mode You should see FREQ withthe MHz in blocks Use A
13. inal carrier 5 DELIVERY 5 1 D amp M shall not be liable to the Customer or be deemed to be in breach of contract by reason of any delay in performing or any failure to perform any of the obligations in relation to the goods and services if the delay or failure was due to any cause beyond the reasonable control of D amp M 5 2 Without prejudice to the generality of the foregoing the following shall be regarded but not limited to as causes beyond the reasonable control of D amp M act of God explosion flood tempest fire or accident war or threat of war sabotage insurrection civil disturbance or requisition acts restrictions regulations bye laws prohibitions or measures of any kind on the part of any governmental parliamentary or local authority import and customs regulations charges or seizures strikes lock outs or other industrial actions or trade disputes by employees of the postal system carriers or other third parties difficulties in obtaining raw materials labor or parts power failure or breakdown in machinery 6 TRANSFER OF RISKS AND OWNERSHIP 6 1 Risks shall be transferred to the purchaser as of dispatch of the goods including goods sent carriage paid 6 2 In accordance with Law D amp M shall reserve ownership of the goods sold until the purchaser has made full payment of all moneys due In this respect under the terms of the present provision the remittance of bills or any instrument creating an oblig
14. inations usually at less than 0 5 Watt some sub harmonic and or spurious signals may be generated Were low power level transmission was imperative verify with a spectrum analyzer that the transmitter is correctly functioning at and just below the operation power lowering the exciter to final amplifier power via the exciter board power regulator may help and even completely fix the problem The installation of the transmitters is thereby completed D amp M wishes you success in your work and remind you that they are always available for further information or to tackle any specific problem www fmuser org STL RECIEVER FOREWORD TO INSTALLATION Install the RECIEVER in a dry vented dust free environment with a mean temperature of 10 35 C Do not install on surfaces or racks subjected to vibrations external vibrations can impair S N ratio Connect your audio source using suitable cables and connectors The STL10 Series audio circuitry is similar to hi fi equipment and should be installed and wired with the same attention avoid earth loops as much as possible When these conditions are met the transmitter will deliver excellent audio characteristics The STL10 Series are fully RF shielded and can be installed close to the production studio this type of installation allows constant monitoring of audio levels deviation and power parameters The transmitter can also be installed in other locations away from the studio and connec
15. ircuits and parts Built in stereo coder www fmuser org SAFETY FIRST IMPORTANT In order to avoid risks to personnel in the installation utilization and maintenance of units the following safety procedures and guidelines will be followed Improper use or installation of this apparatus could cause serious damage to objects and people alike Therefore it is essential to rely on an installer who has been previously authorized or approved by D amp M or by our local representative and that both the user and the installer read the whole manual before carrying out any operation Failure to apply these guidelines can lead to situations in which legally applicable safety standards are not met In these cases D amp M shall be exempt from any responsibility All units will be properly grounded through the network wire or through a special ground wire for this purpose The ground should meet guidelines applicable to low voltage systems Do not use units in areas containing an explosive atmosphere or where inflammable gases or smoke may be present Fuses blown as a result of short circuit must be replaced with new one of the same value and characteristics Repaired fuses must never be used Fuse sockets should be checked to ensure that they have not been damaged Do not make any modifications to units Any modification can lead to additional dangers that cannot be controlled Do not use inflammable products which can lead to a risk of fir
16. is guaranteed for a period of 12 months from the date of the sales invoice against defects providing the goods in the case of kits are constructed and soldered properly are not subject to use that is beyond normal reasonable wear and tear are not powered with an unsuitable power supply power source or battery in the case of transmitters are not operated with an unsuitable antennas or RF loads that cause damage to the output transistors are not damaged from excessive over heating due to inadequate ventilation any kinds of RF power transistor defect are not warranted 9 2 Qualifying goods will be repaired or at our option replaced providing the goods are returned to us carriage paid and suitably packaged within a 12 month period together with a copy of the original sales invoice To prevent import charges being made on returned goods from countries and territories outside the Taiwan 4 photocopies of the original D amp M sale invoice should be attached to the outside of the packaging together with the relevant completed customs documentation stating that the goods originated from the Taiwan and are being returned for repair replacement Under no circumstances will any returned goods requiring payment of import charges be accepted by D amp M 9 3 Warranty against any manufacturer s defect Damage due to improper installation overdrive over voltage damaged I O pads or traces and over temperature invalidate warranty RoHS related failure
17. lectable input impedance The audio inputs can be set to 600 10K ohm resistive impedance factory preset is 10k ohm They can be connected to the balanced output of a professional mixer or to the unbalanced output of a low cost unit without appreciable degradation Selection of the input impedance is done by jumpers JP1 and JP2 on the input board www fmuser org shown to the right Impedance selection is silkscreened on the component mask of the board LF audio mono or stereo input employ XLR female connectors use balanced coaxial cable connected to pin 3 and pin 2 Connect the ground of the driving equipment to pin 1 In case of unbalanced drive input pin 2 shall be AUDIO INPUT short circuited with ground and shield on pin 1 while the x PUSH signal shall be available on pin 3 High impedance selection 5K ohm instead of 10K ohm Wee With a balanced audio signal the audio cables can be s for 100 meters GUSH MPX an externally processed signal usually an Fee Ee unbalanced signal be supplied to the female BNC LEFT A connector marked EXTERNAL which is internally parallel gt Axe J wired with the mono right channel connector for this reason 4 it is not possible to connect signals to these two connectors at the same time Higher impedance position is 5K ohm in this case 2 Signal f 2
18. nd pre emphasized The FMT Series with internal stereo encoder is usually factory preset to process the right channel input signal in the mono mode it is however possible to use the left channel signal similar way by moving jumper 1 the stereo encoder board from position R to L It is also possible to mix automatically the left and right channels for mono by inserting 2 jumpers in L and R on the encoder the transmitter is thereby already preset for stereo operation if needed 2 Move MODE to Mono and set L R to www fmuser org Mono or Stereo Broadcasting from Radio Link Receiver or an External Encoder 1 In this case the signal is already multiplexed and pre emphasized Use the External or Stereo audio input The signal skips the coding and filtering stage and therefore is not pre emphasized 2 Move MODE switch to External Operation with a RDS or SCA Encoder 1 Wire the BNC type Aux connector to the output of the RDS or SCA Encoder momentarily disconnecting any other signal if present Wire the pilot tone synchronization output to the corresponding input of RDS encoder if present 2 Momentarily move MODE switch to Mono 3 Adjust RDS or SCA encoder output level and or transmitter aux level front trimmer marked aux gain to achieve the right modulation level Modulation Adjustment with broadcast signal Check the modulation level for adequacy as f
19. ntrol is easy to be set when applying the nominal signal from an external generator whose level is known and regulating it to display the wanted modulation on the modulation meter The transmitter s internal limiter is of the peak clipping type this means that as soon at it cuts in modulation distortion increases sharply For this reason the modulation signal should be kept under control to prevent intervention of the limiter 5 66 4244 UUAA The cut in limiter threshold is factory preset to 2 5 dB 100 kHz peak value It may be set from dB 75 kHz more than 6 dB 150 kHz This threshold value is mostly specified in the various national standards and tolerance to short over modulating peaks varies from country to country In any case the modulation peak value that is internationally admitted for FM is 75 kHz for peaks that are not extremely short For this reason the limiter s cut in threshold should never be too high It is highly recommended to use an external multi band limiter to optimize modulation with higher tolerance for any audio signal peaks Such devices momentarily reduce the amplifier circuits gain if the threshold is exceeded and prevent severe significant distortion Any external compressor limiter or audio meter must be frequency compensated with the same time constant of the pre emphasis to modulate or monitor deviation properly Therefore the audio level shall be constantl
20. ollow 1 Send a sufficiently constant musical signal to modulator input check that the meter needle hovers around dBm and moves into the red range during signal peak only and by more than 1 or2dB For any other reading adjust the mixer s MASTER volume until the above conditions are obtained The Limiter alarm should never or very rarely shows up as this would indicate distortion If the limiter is set just above 75 kHz the LIM will shows up above OdB and the www fmuser org meter will never show a much greater value Factory preset is LOOKHz 2 5dB MODE Switch on Mono and In this position the audio circuit gain of the transmitter is slightly below unity 90 and corresponds to the sensitivity obtainable in the stereo position with pilot tone which allows for the remaining 10 Use this setting exclusively to test briefly stereo mono switch when no volume variation is desired in the modulation In this case for two channel mono operation it is preferable to place two jumpers in L and R at the BDI position on the stereo encoder board to use both channel mixed in transmission For protracted mono broadcasting use the position OdB which permits correct 100 modulation with OdB level as indicated by the internal meter Low power level transmission The FMT Series transmitters are not specified at power level less than 2 Watt as with some power and frequency comb
21. r is pre set and fix by factory due to narrow band pass filter inside Only few MHz bandwidths allow adjusting If you need to change your receive frequency please info your local service or back to factory to get better receiving www fmuser org Once you have set the frequency use the lt gt keys to change to the next parameter This will display the MODE with the STEREO in STEREO blocks use the A YW keys to set the receive mode with STEREO or MONO MUTE Use the lt P keys to change to the next parameter This will display the MUTE with the dBuV in dBuV blocks use the YW keys to set your minimum receiving level with dBuV Lower this signal level will force the audio output cut off and goes to MUTE mode www fmuser org AUDIO AND MPX OUTPUT LEVEL Use the lt gt keys to change to the next parameter This will display the L R with the dB in dB blocks use the A WY keys to set your audio output level from 9 to 6 dB Use the lt gt keys to change MPX output level WARNING OPERATION WITHOUT ANTENNA BADLY TUNED ANTENNA FAULTY ANTENNA CONNECTION POOR COAXIAL CABLE CONNECTIONS OR OPERATOR ERROR CAN CAUSE DEGRADATION AND POSSIBLE DESTRUCTION TO THE TRANSMITTERS FINAL AMPLIFICATION STAGE FAILURES OF THIS NATURE ARE NOT COVERED BY THE GUARANTEE www fmuser org GENERAL CONDITIONS OF SALE All or
22. s or performance reduction are not warranted Proper installation procedures electrical and mechanical must be followed Any evidence of solder tampering outside of connection areas also invalidates warranty Shipping costs are not covered in warranty Minor deviations from specifications which do not affect the performance are excluded from the warranty All repairs warranty or otherwise require a Return Material Authorization or RMA 10 ATTRIBUTION OF COMPETENT JURISDICTION Any disputes concerning the interpretation or execution of the present general conditions of sale shall be referred exclusively to the Commercial Court in Taipei regardless of the place of delivery or the means of payment accepted
23. ted with several meters of LF co axial cables with no adverse effect on modulation quality Remote installation usually requires STL Studio to Transmission Link equipment Final modulation performance is based upon the system installation give careful consideration to where you will locate the transmitter Additional advices are given in the appropriate paragraphs in this manual to assist you to achieve an optimum environment www fmuser org RF CONNECTION Connect the N type input connector marked ANT in from the antenna system with top grade 50 ohm shielded cable We suggest RG213 cable or RG58 cable can be used Times Microwave Cell Flex Andrews all manufacture high quality low loss coax POWER UP 1 Connect reciever to mains check the ground Menu will display the model and firmware version Our ODM Series will display the customer s information then go to normal monitor page www imuser org SETTING FREQUENCY AND OTHER PARAMETERS If this is the first boot or you need to change the systems configuration keeping press lt and button same time during power on It will goes to service mode once complete the LCD will look like this You should see FREQ with the MHz blocks Use A WV to change frequency press hold for fast forward for fine tune press and release You can select any frequency in 10 kHz steps The frequency of STL receive
24. www fmuser org USER MANUAL www fmuser org STL10 FM STL TRANSMITTER RECEIVER INTRODUCTION The STL10 xxT is a solid state wideband FM Transmitter providing a continuously variable RF output form to 25 watts into a 50 Ohm load at many frequency within the UHF VHF band in 10 kHz increments The STL10 xxR receiver uses the same synthesized oscillator as the transmitter A comb line band pass filter ensures image frequency rejection exceeding 60dB The achieved sensitivity in mono is around LOmvV per 60dB of SNR low noise and distortion and high interference rejection With full range universal power input and built in active PFC function Those STLs can operate on either 90 264VAC 47 63Hz or 127 370VDC as mean power to suitable most of Countries in the world Digital amp Microwave System D amp M has designed and manufactured broadcast equipment since its incorporation in 2000 Our product line has consistently applied the best in current technology to the specific needs of broadcasters FEATURES Easy and direct programming of the frequency by LCD Step 10 KHz Soft start from RF mute status Adjustable power output from to 25 W with automatic power control maintaining the output at any fixed level Available with External AUX MPX input connectors Meets or exceeds all FCC and CCIR requirements High reliability provided by conservatively rated components Modular layout with Plug in easy replaceable c
25. y and correctly monitored and adjusted to prevent as much as possible the internal limiter from cutting in On the other hand the audio level should be as high as possible to achieve the best on air sound 15 www imuser org The tendency to over process the audio signal is common with local broadcasting stations some sort of processing is advisable and we recommend using a top grade multiband compressor but not as to compress the signal to a point that impairs the original dynamics The audio response of the STL10 Series is very flat without perceivable loss on low and high audio frequency for these reasons large frequency alterations of the audio signal supplied by using a so called frequency equalizer are not advisable An increase of the low and high frequency contents of the audio signal by more than a few dB can cause general degradation of modulation dynamics and improper functioning of the limiter www tfmuser org OPERATION Stereo Broadcasting with 2 Input Audio Channels 1 Wire the XLR type modulation input connectors marked Left channel and Right channel to the output of the two channels from the mixer or stereo source 2 Change MODE to Stereo Mono Broadcasting from a monophonic audio source 1 Wire the right or mono input connector to the corresponding audio source as above Please note that in this case too the signal runs through the channel s processors and is 15 kHz filtered a
Download Pdf Manuals
Related Search