Belar FMS-1 Instructions Manual Download Page 36 | Manualshive

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Summary of Contents for FMS-1

Page 1: ...www SteamPoweredRadio Com Broadcast Ec1uipment FMS 1 STEREC MONITOR ...

Page 2: ... major components listed in the instruction manual for the specified period Belar will repair or replace products which prove to be defective during the warranty period provided that they are returned to Belar No other warranty is expressed or implied Belar is not liable for consequential damages For any assistance contact either your Belar Sales Representative or Customer Engineering Service at t...

Page 3: ...www SteamPoweredRadio Com Bro adc st Equipment Instructions FMS 1 Stereo Monitor BELAR ELECTRONICS LABDRATDRV INC ...

Page 4: ...www SteamPoweredRadio Com ...

Page 5: ...15 4 1 1 Stereo Demodulator Phase Discriminator Card Al 15 4 1 2 Audio Voltmeter Card A2 16 4 1 3 Pilot Frequency Meter Card A3 16 SECTION 5 PAGE MAINTENANCE 18 5 1 5 2 5 2 1 5 2 2 5 2 3 5 3 5 3 1 5 3 2 5 3 3 5 3 4 5 3 5 5 3 6 5 3 7 5 3 8 5 3 9 5 3 10 5 3 11 5 3 12 INTRODUCTION 18 PERFORMANCE CHECKS 18 Frequency Deviation Meter Check 18 Modulation Mod Zero Meter Check 18 Function 18 ADJUSTMENT CAL...

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Page 7: ...d controls and test points are located under the hinged front cover bar Factory adjustments are located within the unit and on the back panel The baseband input power connections and monitor outputs are located at the rear of the FMS 1 chassis on individual connectors and rear terminal block as shown in Figure 1 3 The FMS 1 is completely solid state utilizing all silicon transistors for long troub...

Page 8: ...nnel Response of the Right Channel Cl 111 1 1 4 ELECTRICAL SPECIFICATIONS Pilot Frequency Meter Range 3 Hz Pilot Frequency Meter Accuracy 0 2 Hz 0 001 Modulation Meter Range 133 to 70 db Modulation Meter Accuracy Better than 5 over entire scale Frequency Response Land RI 0 5 db 50 15000 Hz Separation 45 db 50 15000 Hz Meter range 70 db Crosstalk 60 db L R to L R Outputs 60 db IL RI to L R 66 db SC...

Page 9: ...1 3 All I 10 n SIDE VIEW 7 correspondence to your Belar representative or to the Belar factory in regard to the instrument should reference the model number and complete serial number 1 7 ACCESSORIES The Belar FMS 1 Stereo Frequency and Modulation Monitor may be used for the remote monitoring of a stereo FM transmitter with the Belar MP 2 Remote Meter Panel The MP 2 Remote Meter Panel contains a p...

Page 10: ...HT ls1 s I I c OI s c c o 3 s OI s 0 s s c I a co 0 I k9 c L J N OUI i a N ON N Figure 2 1 z 1 lD Z x 0 00 zo 0 z I J I r s S s s s s s s s 3 c __ Nl_ c c 6 _ c I 6 I I I c u 0 0D Cl 0 I LOUT COMMON GND ROUT l REMOTE MOD METER Y REMOTE FREQ METER REMOTE PILOT 25V 19VAC OUND GR ...

Page 11: ...dard 19 inch rack mount The monitor may be mounted below the companion Model FMM 1 FM Frequency and Modulation Monitor When the monitor is mounted above high heat generation equipment such as vacuum tube power supplies consideration should be given to cooling requirements which allow a free movement of cooler air around the FMS 1 In no instance should the ambient chassis temperature be allowed to ...

Page 12: ...ransmitted signal 10 FUNCTION SWIT CH When in INC AM position measures t he AM generated by the FM modulation process in the transmitter 11 METER RANGE SWITCH When in MOD position measures the percentage of modulation with the peak reading voltmeter 12 METER RANGE SWITCH When in O to 50 DECIBELS positions measures the crosstalk noise and intermodulation with the average reading voltmeter 13 FREQUE...

Page 13: ...oximately the same modulation levels on the left and right channel metering positions as with a well balanced stereo program This is why it is preferable to monitor the L R level which indicates the degree of separation This also is an easy way to precisely balance the left and right channel levels into a stereo transmitter If monaural programming is applied to the stereo transmitter the balance m...

Page 14: ...this reading is a function of L being exactly equal to R the amplitude of one or the other may be adjusted to minimize the reading in the L R channel Also note that any harmonic distortion in the L R channel may appear as a reading in the L R channel For example the second and third harmonics of 15 kHz are 30 and 45 kHz and may appear as a crosstalk reading 2 distortion is only 34 db down 3 3 10 C...

Page 15: ...nnels respectively Standard levels are 99 90 signal plus 9 pilot 59 50 signal plus 9 pilot and 34 25 signal plus 9 pilot Note that 90 signal plus 9 pilot will not add on total modulation to yield exactly 99 This is because the peaks of the 19 kHz pilot do not occur simultaneously with the I I 10 11 19 27 28 13 peaks of t he 38 kHz double sideband L R signal The reading is 1bout 1 lower 3 3 15 DIST...

Page 16: ...rence between the L R and 38 kHz readings is the ratio between the desired sidebands and unwanted sidebands and is the intermodulation between the left and right channels There are no standards for this measurement but it is a useful test since harmonic distortion of a stereo signal above 5 kHz is filtered out by the 15 kHz filters rendering a harmonic distortion test invalid 3 3 19 PHASE CALIBRAT...

Page 17: ...and applied to th 19 kHz doubler consisting of the pha splitter A103 and foll wave rectifier A1CA 1 and CR2 The 38 kHz output of the doubler is am1Plified by A104 PHASE ADJUST inductor L1 Jwith capacitor A1C12 filters the 38 kHz and provides the necessary phase adjustment for pilot phase calibration Tlhe output of the 38 kHz amplifier is applied to the limiter A105 and 06 which amplifies an square...

Page 18: ...ridge A2CR3 through CR6 rect the output to drive the modulation meter A sample of the output is applied to the emitter of A2Q9 to provide feedback to stabilize the gain and linearize the meter reading The gain is adjusted by A2R4 An output is also taken from the amplif1 er to provi8e an oscilloscope output SCOPE that follows the sensitivity setting of the RANGE switch When the RANGE switch is on M...

Page 19: ...rm Incorrect Balance 2 L R Subcarrier with Pilot 5 Composite Stereo Waveform Excess L R 8 L R Subcarrier with Pilot Pilot Phase Incorrect 11 Phase Discriminator Carrier Figure 5 1 3 L R Main Channel with Pilot 6 Composite Stereo Wav11form Phase Error Between L R and L R 9 Stereo Demodulator Waveform No Modulation 12 Phase Discriminato1r Carrier Incorrect Pilot Phase 17 ...

Page 20: ...ut zero Return the pointer to zero after check 5 2 3 FUNCTION Sections 3 3 1 through 3 3 20 may be used for the remainder of the performance checks 5 3 ADJUSTMENTS AND CALIBRATIONS Place the FMM 1 in normal operation Before performing any adjustments on the FMS 1 verify that the FMM 1 is operating normally as outlined in the manual on the FMM 1 under Section 5 2 V Before proceeding with FMS 1 alig...

Page 21: ... readings in necessary remove pilot tone during this adjustment the MOD and Odb positions of the DECIBELS switch However if this is done the phase calibration procedure above must be repeated when pilot is restored Adju t A equal L and R indications on FMS 1 V mo d 11ti m meter as the FUNCTION switch is set alternately to the LEFT and RIGHT positions 5 3 5 A 1R25 ADJUSTMENT Set DECIBELS switch to ...

Page 22: ...voidably required such as a drift of pilot level indication When the 19 kHz filter is realigned the 19 kHz pilot calibrate potentiometer R9 must be reset a 19 kHz Filter Alignment Remove modulation but apply pilot tone Seit FMS 1 FUNCTION switch to the Pl LOT position Uns1 rew the cores of 19 kHz filter variable inductors so that th cores are almost out Now reset the cores for maximum indication o...

Page 23: ... R33 Cl R57 cs 09 02 C10 FS C34 87 8 07 R10 ES R34 A1 R58 85 010 A2 C11 F4 C35 C7 9 FS Rl 1 FS R35 A2 R59 AS 011 82 C12 F3 C36 C6 10 FS R12 FS R36 81 R60 cs 012 C2 C13 E3 C37 C7 11 E3 R13 E4 R37 82 R61 cs 0 13 05 C14 F2 C38 07 12 E3 R14 F4 R38 A2 R62 85 014 AS C15 05 CRl E4 13 E4 R15 F4 R39 82 R63 C6 015 A6 C16 E2 CR2 F4 14 84 R16 E4 R40 82 R64 A6 016 C6 C17 F2 CR3 02 15 83 R17 F4 R41 C2 R65 86 Tl...

Page 24: ... A2 8 Cl 34 F2 R10 E3 R36 07 R62 B1 0 18 02 C26 A2 9 A1 35 F2 R11 F4 R37 C7 R63 B2 Cl Fl C27 03 10 Al 36 E6 R12 F4 R38 A7 R64 C2 C2 F2 C28 C2 11 Al 37 E7 R13 E4 R39 A6 R65 01 C3 E2 C29 Cl 12 B3 38 05 R14 E5 R40 A7 R66 02 C4 F3 C30 C2 13 A5 39 05 R15 E4 R41 A6 R67 02 C5 E2 C31 C2 14 A5 40 05 R16 E4 R42 C4 R68 01 C6 F3 CR1 F2 15 B5 41 05 R17 F4 R43 C4 R69 02 C7 F4 CR2 F5 16 B5 42 B6 R18 F5 R44 C4 R7...

Page 25: ... 4 B3 1 C6 R3 A6 R17 A2 R31 04 C1 A6 C15 C3 05 B1 2 B6 R4 A6 R18 B3 B32 C4 C2 AS C16 C3 06 cs 3 A6 RS B5 R19 A2 R33 C3 C3 A4 C17 C2 07 D4 4 AS R6 B5 R20 B2 R34 D3 C4 A4 C18 C2 08 04 5 AS R7 AS R21 Al R35 C3 cs A3 C19 cs 09 C2 6 A4 RS A4 R22 Al R36 C2 C6 B3 C20 C2 010 D1 7 A2 R9 A4 R23 A1 R27 D1 C7 A1 C21 01 CR1 AS 8 A2 R10 B4 R24 04 R38 C1 cs A2 C22 01 CR2 B5 9 Al R11 B4 R25 C6 R39 C1 C9 D5 C23 B2...

Page 26: ...www SteamPoweredRadio Com 24 Figu1 re 5 5 Chassis Top iew ...

Page 27: ...www SteamPoweredRadio Com Figure 5 6 Chassis Bottom View I 25 ...

Page 28: ... number of unit b Description of part including the reference designation and location c Belar part number To order a part from a manufacturer other than Belar provide the complete part description and the manufacturer s part number from the table DESIGNATORS A assembly J jack s switch C capacitor L inductor T transistor CR diode M meter TB terminal board DS device signaling lamp p plug w cable F ...

Page 29: ...ERS 3101 0004 S5 S6 S7 S PUSH BUTTON PHASE CAL DE EMP 3101 0005 TB1 TERMINA L BLOCK 12 PT 0360 0002 A1 CARD STEREO DEMODULATOR AND PHASE DISCRIMINATOR A1C1 C5 C12 C31 C35 C FXD POLY 01 UF 2 25 voe 0130 0001 A1C2 C4 C FXD MICA 500 PF 5 500 voe ELMENCO DM15 0140 0006 A1C3 C FXD POLY 0091 UF 2 25 voe 0130 0002 A1C6 C FXD FLM 0047 UF 10 80 voe SPRAGUE 192P 0120 0001 A1C7 C14 C16 C17 C37 C FXD ELECT 5 ...

Page 30: ...002 A 1R53 thru R56 R FXD COMP 10K OHM 5 W RC20GF 0686 1035 A 1R59 R60 R72 R FXD COMP 10K OHM 5 W RC20GF 0686 1035 A 1R61 R62 R69 R FXD COMP 33K OHM 5 W RC20GF 0686 3335 A1R63 R FXD COMP 18K OHM 5 W RC20GF 0686 1835 A1R64 R FXD COMP 22K OHM 5 W RC20GF 0686 2235 A1R65 R FXD COMP 220K OHM 5 W RC20GF 0686 2245 A1R70 R FXD COMP 4 7K OHM 5 W RC20GF 0686 4725 A1R71 R FXD COMP 100K OHM 5 W RC20GF 0686 10...

Page 31: ... COMP 12K OHM 5 W RC20GF 0686 1235 e A2R37 R F XD COMP 12K OHM 5 W RC20GF 0686 1235 A2R38 R40 R43 R57 R FXD COMP 10K OHM 5 W RC20GF 0686 1035 A2R39 A FXD COMP 180 OHM 5 W RC20GF 0686 1815 A2A41 R VAR WW l OOOHM CTS 110 100 2100 0013 A2R42 R56 A FXD COMP 620 OHM 5 W RC20GF 0686 6215 A2R44 R45 R58 R59 R FXD COMP 4 7 OHM 5 W RC20GF 0686 0475 A2R47 R51 R61 R65 A FXD COMP 100 OHM 5 W RC20GF 0686 1015 A...

Page 32: ...D COMP 7 5K OHM 5 W RC20GF 0686 7525 A3R13 R FXD COMP 1 2K OHM 5 W RC20GF 0686 1225 A3R14 R17 R20 R22 R FXD COMP 2 2K OHM 5 W RC20GF 0686 2225 A3R15 R FXD FLM 46 4K OHM 1 1 8W RN60D 07fi7 0012 A3R16 R23 R FXD FLM 20K OHM 1 1 8W RN60D 07fi7 001 3 A3R18 R26 R34 R FXD COMP 100K OHM 5 W RC20GF 06816 1045 A3R19 R29 R33 R35 R37 R40 R FXD COMP 10K OHM 5 W RC20GF 061 16 1035 A3R24 R FXO COMP 330 OHM 5 W R...

Page 33: ...rinted circuit card assemblies and chassis assembly Note that all part numbers are prefixed by the assembly number e g A2R34 The main chassis part numbers are not prefixed Non standard parts are labeled with only the reference designations The parts list in Section 6 contains the Belar part number 31 ...

Page 34: ...N OtlMS VAUJE SELECTEO IN PIIODUCTION NOMINAL VAUJE MOWN ALL TRANSISTORS 2N3053 EXCEPT 08 ZN4037 Q MATCHED PAIR MATCHED OUAD CZ7 I R6I SU CZ6 Oyl I6 q p c f l7 _ b t l C t c l _ PHASE CONTRQ II IZ 13 t ci Rl6 47K 1N 41 i CII r CR2 IN54l Rl4 R I Rl7 i I 2 IUK IOK 120 Ot f I 14 l T r LAST R 72 C 38 CR II L 6 0 18 T I I Rl9 IU Rl8 6 2K 25V 3 Kt11 OUTPUT D 1 8 z I R31 t 1 l CR3 l V I N 1614 R21 r i r ...

Page 35: ... w 1 I l I 1 r l a_ 411 2 I R1 1 c e 1 100 1137 100 43 1 21 LEFT MONITOR AMPLI FIER 12 RIGHT MONITOR AMPLIFIER R67 t j R113 IIK 211 0111 l 2 nr 7 NOTE 2 5 Y_ Rso J Lc21 RI lR110 120 r 15 01 5 R 59 4 7 R III 4 7 037 R62 1R61 l R 57 RIIS R 53 R 52 iia 100 I 10 c a20 1 K t 21 100 c2a I czt l I c211 r r 5 n 9 II 1 n n 17 ALL RESISTANCE VALUES AIIE IN OHMS DVALUES SELECTED IN PRODUCTION NOMINAL VALUES ...

Page 36: ... RI CR4 i j C6 1 C23 I J3K I N541 1 J5pF YI R25 4 71 190 0 0JOft w ctC l 1 1 Cl9 D c _ip__ I 19 0 060 KHZ Q_ _CI_ LLATOR 5pF QI t j_c14 a J T 047pF n FREQUENCY MULTIPLIE R M L J c11 r l H 3 C21 R40 Lit R37 R34 R31 R30 D r QI IOK IOK Cl7 Cl5 IOOK 6 fi l t20K Cl R27 l 0 11 33PF Ol_pF 10001 H C22 TT R35 Cl3 R28 TQ 22pF IOK 01 F 4 7K 12 08 07 f 3 9 1 1 L L nL2 R33 R32 R29 13 7 I CK OlpF I 5 JK 2000 1 ...

Page 37: ...L 9 10 7 8 16 17 19 20 u R ot c r G h J t sc W 1j JSli I _ t J q R9 0 5K I IM AM J RII l IOOK AM NOISE RIO 04 IOOK t TOTAL s 0 JR4 l K SI B R2t RS D 1 2K L R FILTER 1 2K kft FL3 I 0 R6 I tK L R FILTER _iL2 L f IL2 FL4 R7 L 0 IK R I38 KH i FILTER ll K H FL5 I R8 J IK NOTE 3 4 _r 14 _ _I 5 6w SI C SI D 7 _f 0 0 __ i VALUE SELECTED IN PRODUCTION NOMINAL VALUE SHOWN 15 KH FILTER L FLI 15 KHt FILTER 5 ...

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