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Marti Electronics STL-10A, Technical Manual

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MARTI 
ELECTRONICS

STL TRANSMITTER 

MODEL STL–10A

October, 2001

597–9500

Summary of Contents for STL-10A

Page 1: ...MARTI ELECTRONICS STL TRANSMITTER MODEL STL 10A October 2001 597 9500...

Page 2: ...D ADJUSTMENT 7 OPERATION 7 SWITCH AND METER FUNCTIONS 7 TRANSMIT OFF SWITCH AND LED 7 FORWARD REFLECTED SWITCH AND RF POWER METER 8 PEAK MODULATION METER 8 TEST METER 8 PRE EMPHASIS SWITCHES 9 FREQUEN...

Page 3: ...JUST 17 REVERSE POWER METER ADJUST 17 PA CURRENT ADJUST 18 FREQUENCY MEASUREMENT 18 STL 10A PARTS LIST 22 STL 10A SCHEMATICS 33 LIST OF ILLUSTRATIONS FIGURE NO TITLE PAGE NO 1 STL 10A TRANSMITTER 1 2...

Page 4: ...on cost or other costs of any nature as a result of the use of the products manufactured or sup plied by the Seller whether used in accordance with in structions or not This warranty is in lieu of all...

Page 5: ...st Inter city relay for linking two or more broadcast facilities Multi relay system for radio network distribution Communications link between satellite earth station and broadcast facilities Data and...

Page 6: ...2 FIGURE 2 STEREO STL SYSTEM BLOCK DIAGRAM 702 058 COPYRIGHT 2000 MARTI ELECTRONICS...

Page 7: ...technology and is manufactured in modern efficient facilities under high quality control standards STL 10A System Specifications Freq Range MHz Transmitter Maximum Power Maximum Deviation Receiver Re...

Page 8: ...S Precision Peak hold Bar Graph Modulation Meter Illuminated RF Wattmeter indicates Forward Power Reflected Power Test Meter reads PA Current Subcarrier Level 13 5 Volt Supply and RF Drive 1 RF Drive...

Page 9: ...ed rack cabinet Do not locate solid state equipment in a rack above tube type equipment which produces high temperatures Problems can also be avoided by locating this unit away from other equipment wh...

Page 10: ...rer s instructions carefully If no instructions were included with the antenna call or write the antenna manufacturer for instructions Errors are frequently made in assembly of the RF feed dipole elem...

Page 11: ...ng in a signal level of only a fraction of the major lobe signal This error can be avoided only by swinging the antenna through a large angle so that all lobes are evaluated and the major lobe clearly...

Page 12: ...modulation composite or mono mode The five highest LED s 100 to 250 have a peak hold feature which will display an instantaneous peak value for one second This is a valuable feature when dealing with...

Page 13: ...75 micro second pre emphasis Received signal levels less than full quieting may produce a difference of as much as 13 dB between flat and 75 micro second pre emphasis FREQUENCY MEASUREMENT The RF out...

Page 14: ...the de emphasis curve selected At 15 KHz there is sufficient level to operate most modern distortion analyzers Distortion levels should be within specifications If distortion is out of specs check sys...

Page 15: ...frequency ranging from 445 to 480 MHz is fed into the 10 15C PA Interface board 800 374B The purpose of this board is to double the incoming frequency amplify the doubled frequency and filter out all...

Page 16: ...12 COPYRIGHT 2000 MARTI ELECTRONICS FIGURE 3 FCC EMISSION PROFILE 500 KHZ CHANNEL DRAWING...

Page 17: ...13 FIGURE 4 FCC EMISSION PROFILE 200 KHZ CHANNEL DRAWING COPYRIGHT 2000 MARTI ELECTRONICS...

Page 18: ...unter to the sampling attenuator or J5 the FREQUENCY TEST JACK Operate the CONTROL switch to TRANSMIT 1 Measure the bias voltage at TP test point of modulator circuit board 800 195 using digital dc vo...

Page 19: ...________________________ kHz Total DC Current __________________________ amperes TEST POINT READINGS TP 1 __________ 0 15 V dc 0 60 V dc TP 2 __________ 0 70 V dc 1 90 V dc TP 3 __________ 0 50 V dc 1...

Page 20: ...be to chassis ground Operate the CONTROL switch to TRANSMIT A minimum of 0 25 volts should be indicated If not refer to MODULATOR CIRCUIT BOARD ADJUSTMENTS in the preceding text 2 Move the meter negat...

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