Belar FMM-1 Instructions Manual Download | Manualshive

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Summary of Contents for FMM-1

Page 1: ...Broadcast Equipment FMM 1 FM MONITOR ...

Page 2: ...ents 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 the Belar fact...

Page 3: ...Broadcast Equipment Instructions FMM 1 FM Monitor BELAR ELECTRONICS LABORATORY INC ...

Page 4: ...Calibrator Check 15 5 2 7 Remote Meter Switch Check 15 5 2 8 Percent Mod Potentiometer Check 15 5 2 9 Modulation Polarity Check 15 5 2 10 Carrier Level Check 15 5 2 11 Operate Check 15 5 2 12 De emphasis Switch Check 16 5 3 ADJUSTMENTS CALIBRATION 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 TROUBLESHOOTING 16 Power Oven 16 Oscillator Level 16 Frequency Meter Amplifie...

Page 5: ...nd Modulation Monitors The FMM 1 incorporates a deviation type modulation calibrator to insure the accuracy of the modulation readings at any time 1 2 PHYSICAL DESCRIPTION The FMM 1 Figure 1 2 is constructed on a standard 5 x 19 inch rack mount Seldom used controls and test points are located under the hinged front cover bar Factory adjustments are located within the shielded compartments of the m...

Page 6: ...ideband test output four wideband outputs for driving associated multiplex demodulators an AM noise diode output and an incidental AM noise diode output FCC Type Approved remote metering of the FMM 1 may be externally provided for the center frequency deviation meter modulation meter and peak light 1 4 ELECTRICAL SPECIFICATIONS RF Input Sensitivity 0 2 to 10 volts RMS RF Input Impedance 50 ohms RF...

Page 7: ...the rear panel Figure 1 3 All oorrespondence 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 FMM 1 FM Frequency and Modulation Monitor may be used for the remote monitoring of an FM transmitter with either the Belar MP 1 Remote Meter Panel or the Belar RFA 1 RF Amplifier The MP 1...

Page 8: ...A M R F i ell SCA SCA SCA C A M NOISE INPUT d I t to N S S s s 6l s s 4 to N tIl II 10 0 tIl L au ON UlN Figure 2 1 I GROUND N MONITOR OUTPUT II 25V 25V UI CJ REMOTE MOD METER J t REMOTE J FREQ METER CD 0 EXT MOD PEAK LIGHT 19VAC N GROUND ...

Page 9: ...e 2 4 PREPARATION FOR USE The FMM 1 Frequency and Modulation Monitor is designed to be mounted in a standard 19 inch rack mount When mounted in a rack a slight air space should be provided above and below the unit as the heat generated by the crystal oven should be dissipated When the monitor is mounted above high heat generation equipment such as vacuum tube power supplies consideration should be...

Page 10: ...applies a standard deviation to the monitor to check modulation calibration 11 FREO ZERO POTENTIOMETER Standardizes the width of the output pulse of the pulse counter discriminator to read zero in function 9 above 12 AMP BALANCE POTENTIOMETER Adjusts the DC balance of the frequency differential amplifier in function 8 above 13 MOD METER BALANCE Adjusts the percentage modulation meter to read zero ...

Page 11: ...ty i e it responds to both positive and negative peaks it may flash when the modulation meter does not indicate the peak The modulation meter polarity is switched by S4 Note that when the MOD CAL switch is depressed the calibrating signal is applied not only to the metering circuit but also to the peak light and monitoring amplifier Hence the 60 Hertz square wave tone will be heard in an aural mon...

Page 12: ...UENCY I c TRIPLER CRYSTAL I OSCILLATOR VOLTAGE 87 108 MHZ I REGULATOR Q2 I 650 KHZ 018 Q19 Q20 I Ql I L I CRYSTAL OSCILLATOR I 29 36 MHZ I Ql 15V L I I PHASE VOLTMETER 25V SPLITTER AMPLIFIER Ql Q2 Q3 Q4 I I PRE REGULATED PHASE SCHMITT POWER SUPPLY SPLITTER COMPARATOR Ql Q2 Q3 I Q13 Qll Q12 I MONITOR AMPLIFIER I Q15 Q16 Q17 Q18 L c PERCEN MODULATI Figure 4 1 ...

Page 13: ...3 014 015 Q16 017 AMPLIFIER ASSEMBLY A3 TER IER 04 TT HOR 112 f PERCENT MODULATION PEAK RECTIFIER CR1 MONOSTABLE MULTIVIBRATOR t J t 07 08 DC AMPLIFIER 05 06 LAMP SWITCH 09 LOWPASS FILTER FL1 I I I I AMPLIFIER 011 012 l I I I I _J MODULATION METER PEAK LIGHT I FREO DEV P C 2 3 4 BASEBAND OUTPUTS ...

Page 14: ...hich has a dual input The comparator will only respond to positive levels that exceed a given value determined by the setting of the percent modulation control But since the phase inverter inverts the negative modulation each input of the comparator receives a positive going signal one corresponding to the positive modulation and one corresponding to the negative modulation thus making it independ...

Page 15: ...12 2 3 4 5 6 7 8 9 10 Figure 4 2 ...

Page 16: ...filtered modulation to the reference input of the differential amplifier to prevent low 13 mod ulating frequencies from affecting the frequency reading The reference DC voltage is derived from the same 15 volt supply that powers the monostable multivibrator to form a bridge circllit so that the frequency measurement is relatively independent of supply voltage The 15 volt regulator is the series ty...

Page 17: ...ach time the modulation exceeds the pre set level the Schmitt comparator iires and develops a pulse to trigger the monostable multivibrator The monostable multivibrator A307 and 8 produces a rectangular pulse of three seconds duration which drives the lamp switch A309 The PEAK MOD light DS2 is the collector load for transistor A309 The power for the light is supplied by rectifier CR 1 and capacito...

Page 18: ...turn the pointer to zero for normal operation 5 2 6 MODULATION CALIBRATOR CHECK Depress the MOD CAL switch S2 The MODULATION meter M2 should read 100 The FREQUENCY meter Ml may move off from zero to plus or minus a few hundred cycles 5 2 7 REMOTE METER SWITCH CHECK Depress the MOD CAL switch S2 The MODULATION meter M2 should read 100 Adjust the FREQ CAL potentiometer R6 to a reading of plus 1 kHz ...

Page 19: ...be defective 5 3 3 FREQUENCY METER AMPLIFIER a If the FREQUENCY meter M1 pointer fails to go off scale in both the positive and negative direction transistors A2Q14 and 15 are saturated and A2R47 should be replaced with the next higher value 9 1 K or 10K ohms b If the FREQUENCY meter M1 pointer fails to move and the rest of the monitor functions normally release REMOTE METER switch S5 Note that if...

Page 20: ...50 when the modulation level is changed from 100 to 50 Slip the knob as in step a above if it is necessary to correct the reading at 100 after the span has been adjusted 5 3 9 MODULATION POLARITY a With a 400 cycle 100 modulated signal adjust A3R5 to obtain equal reading on MODULATION meter M2 when 17 the MOD POL switch S4 is cycled from positive to negative Note that the adjustment can be observe...

Page 21: ...R10 A2 C4 65 C13 62 RFC5 A1 PINS R2 A5 R11 A2 C5 64 C14 62 CR1 62 1 A2 R3 A4 R12 61 C6 A4 C15 A1 CR2 62 2 A1 R4 64 R13 61 C7 63 C16 A2 CR3 61 3 A1 R5 64 R14 64 C8 A3 C17 61 01 A4 4 61 R6 A4 C1A A5 C9 A2 RFC1 64 02 A3 5 61 R7 63 C16 A5 C10 A3 RFC2 A4 03 A2 6 61 R8 62 C2 A5 C11 A1 RFC3 A3 L1 A5 7 64 R9 62 C3 65 C12 A2 RFC4 62 L2 A3 8 65 ...

Page 22: ...D1 R29 F6 R50 E7 012 B7 C13 E3 CR3 D3 7 F1 R9 E2 R30 F6 R51 B2 013 B4 C14 F4 CR4 E4 8 F2 R10 F2 R31 F7 R52 A3 014 B5 C15 F6 CR5 F6 9 F5 R11 E2 R32 D7 R53 B3 015 B6 C16 E5 CR6 F6 10 F5 R12 F2 R33 C7 R54 C3 016 C5 C17 E5 CR7 E6 11 F7 R13 F2 R34 A6 R55 B3 017 B6 C18 F5 CR8 E6 12 A7 R14 E2 R35 B6 R56 C2 018 C2 C19 F6 CR9 C3 13 A7 R15 D2 R36 A7 R57 B2 019 B2 C20 F7 RFC1 F3 14 A7 R16 E3 R37 B7 R58 B2 02...

Page 23: ...86 R27 Al R47 83 C3 A6 C23 07 CRl A4 15 81 R8 A4 R28 Fl R48 C3 C4 A5 C24 85 CR2 Fl 16 Cl R9 86 R29 Fl R49 C4 C5 85 01 87 CR3 El 17 Cl Rl0 A6 R30 E2 R50 03 C6 C4 02 86 CR4 E4 18 F2 Rll A6 R31 F2 R51 E4 C7 A3 03 85 CR5 E4 19 F3 R12 86 R32 El R52 E4 C8 A4 04 A4 PINS 20 E3 R13 85 R33 El R53 E4 C9 Fl 05 A3 1 07 21 F3 R14 85 R34 01 R54 E4 Cl0 Fl 06 A3 2 C7 22 F3 R15 C5 R35 02 R55 04 Cl1 E2 Q7 F2 3 A7 23...

Page 24: ...21 Figure 5 4 ...

Page 25: ...22 Figure 5 5 ...

Page 26: ...ption 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 REFERENCE 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 fuse Q transis...

Page 27: ...01 R2 R FXD COMP 1K OHM 5 W RC20GF 0686 1025 R3 R FXD WW 0 33 OHM 5 lW IRC BWH 0811 0002 R4 R FXD WW 33 OHM 5 3W SPRAGUE 242E 0811 0003 R5 R VAR WW 500 OHM 10 2W RA20NASD 501A 2100 0001 R6 R VAR WW 50 OHM 10 2W RA20NASD 500A 2100 0002 R7 R VAR WW 100 OHM 10 2W RA20NASD lOlA 2100 0003 R8 R VAR WW 100 OHM 10 2W RA20NASD lOlA 2100 0003 R9 R VAR WW 500 OHM 10 2W RA20NASD 501A 2100 0001 Rl0 R FXD COMP ...

Page 28: ...P 3 3K OHM 5 W RC20GF 0686 3325 A1R6 R FXD COMP 15K OHM 5 W RC20GF 0686 1535 A1R7 R FXD COMP 220 OHM 5 W RC20GF 0686 2215 A1R8 R FXD COMP 27K OHM 5 W RC20GF 0686 2735 A1R9 R FXD COMP 2 4K OHM 5 W RC20GF 0686 2425 A1Rl0 R FXD COMP 1 5K OHM 5 W RC20GF 0686 1525 Al Rll R FXD COMP 100 OHM 5 W RC20GF 0686 1015 A1R12 R FXD COMP 100 OHM 5 W RC20GF 0686 1015 A1R13 R FXD COMP lK OHM 5 W RC20GF 0686 1025 A1...

Page 29: ...008 A2013 Q17 TRANSISTOR SILICON FET Matched Pair 1850 0003 A2014 015 TRANSISTOR SILICON 2N2102 Matched Pair 1850 0004 A2016 TRANSISTOR SILICON 2N2102 1850 0007 A2018 Q19 TRANSISTOR SILICON 2N3053 1850 0008 A2020 TRANSISTOR SILICON 2N2102 1850 0007 A2R1 R FXD COMP 47K OHM 5 Y W RC20GF 0686 4735 A2R2 R FXD COMP 47K OHM 5 Y W RC20GF 0686 4735 A2R3 A FXD COMP 12K OHM 5 Y W RC20GF 0686 1235 A2R4 R FXD...

Page 30: ...15 VDC SPRAGUE 300 0180 0006 A3C15 C FXD ELECT 200 UF 12 VDC SPRAGUE 300 0180 0004 A3C16 C FXD ELECT 50 UF 25 VDC SPRAGUE 300 0180 0005 A3C17 C FXD ELECT 5 UF 25 VDC SPRAGUE 300 0180 0007 A3C18 C FXD CER 0 1 UF 50 VDC SPRAGUE 5C50 0150 0008 A3C19 C FXD ELECT 50 UF 25 VDC SPRAGUE 300 0180 0005 A3C20 C FXD FLM 0 047 UF 10 200 VDC SPRAGUE 192P 0120 0004 A3C21 C FXD ELECT 5 UF 25 VDC SPRAGUE 300 01S0 ...

Page 31: ... 0686 1525 A3R14 R FXD COMP 4 7K OHM 5 W RC20GF 0686 4725 A3R15 R VAR WW 3K OHM CTS 110 3000 2100 0005 A3R16 R FXD COMP 24K OHM 5 W RC20GF 0686 2435 A3R17 R FXD COMP 3 3K OHM 5 W RC20GF 0686 3325 A3R18 R FXD COMP 330 OHM 5 W RC20GF 0686 3315 A3R19 R FXD COMP 1K OHM 5 W RC20GF 0686 1025 A3R20 R FXD COMP 8 2M OHM 5 W RC20GF 0686 8255 A3R21 R FXD COMP 10K OHM 5 W RC20GF 0686 1035 ...

Page 32: ...t 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 29 ...

Page 33: ...QI 2N3478 1 5K O I 2 1 R FC5 CIA ICIB 22PF 5PF NOTES RI 3 9K C3 250PF C4 1 8 7 RI4 10K 9 R5 R7 I K 220 C7 r ALL RESISTANCE VALUES ARE IN OHMS LC8 R8 2OPF 27K A LL PART NUMBERS ARE PREFI XED BY THE ASSEMBLY NUMBER eg AIR6 CDVALUE SELECTED IN PRODUCTION NOMINAL VALUE SHOWN LAST R 14 C 17 L 2 CR 3 Q 3 R FC 5 r CI2 47 1H 20PF 6 CI3 RI2 500 PF 100 CR2 ICR3 IN4446 IN541 5 3 Tcl7 E50 PF 4 ...

Page 34: ...90 27PF RI9 3 9K RI6 R20 R21 2 2K 39 2 2K C31 Q 1 lF t C3 l a OI JF G C2 CI 5 18PFT 12 PF j 650KH 25 V CALIBRATING OSCILLATOR NOTES ALL RESISTANCE VALUES ARE IN OHMS DVALUE SELECTED IN PRODUCTION NOMINAL VALUE SHOWN MATCHED PAIR RS8 3 61 RS7 ISOt MONOSTABLE MULTIVII R26 1 1 K RS6 2 7K C30 O F C29 50 IF R54 3t 15 VOLT REGULATOR II J ALL PART NUMBERS ARE PREFIXED BY THE ASSEMBLY NUMBER eg A2R34 ...

Page 35: ... 59 C 31 RFC 5 CR 9 Q 20 FL Y BUFFERS R30 IK C20 1 0 QI7 II RFC4 100uh LOW PASS FI LTER F LI i R33 68 C26 2 0 lF R48 R47 10K 8 2 K QI6 2N2102 JJF r R49 R46 R45 10K 2K 1 5 K 01 F FERENTIAL AMPLIFIER R44 10K R42 10K C25 10K R r2M AMPLI FIER 31 C24 1 0 lF QI2 2N3053 R40 1 5 K 13 21 15 20 16 17 18 19 Figure 7 2 Osciliator Counter and Amplifier Card A2 Schematic ...

Page 36: ...R64 2 4K R53 R50 4 7 43K R52 R51 10K 620 CI7 CI6 51 R57 n 1 To 1 6K l loOrF C20 23 27 26 24 25 22 21 20 19 15 LA ST NOTES ALL RESIST ANC E VALUES ARE I N OHMS DVALUE SELECTED IN PRODUCT ON NOMINAL VALUE SHOWN MATCHED PAIR ALL PART NUMBERS ARE PREFIXED BY THE ASSEMBLY NUMBER 89 A3CI2 ...

Page 37: ...3 6 21 R24 IK II R25 IK R26 510 33 12 SCHMITT COM PARA TOR MO NOSTABLE MULTIVIBRATOR l48 8K A3CI2 R44 CI4 R41 I K 100 uF 2 7 K 51 15 16 17 LA ST R 64 C 24 CR 5 Q 18 2490 R39 R34 II R33 2 2K CR3 15V fit 32 2 2 K CIO o R29 R28 821 2 2K 50 F I R30 4 18 R31 C9 2150 PF 2 2K CR2 IN9658 Figure 7 3 Amplifier Metering and Flasher Card A3 Schematic ...

Page 38: ...2 2K 9 TB2 CI2 C22 001pF CI2 CI3 CI4 CI5 R21 200 8 r A 5 C9 0IP1 POWER lli IT ASSE MBLY 2 1t _t__ DS3 TI PRE REGULATOR r ________ __ R20 CR2 CR5 IN2070 RI 1 5 CI _T500PF 200 Q2 053 R2 IK QI R3 2N3054 0 33 6 II RI9 IK J9 l CI6 CI7 co u 347 2 I I 1 NOTES 6 ar ALL RESISTANCE VALUES ARE IN OHMS DVALUE SELECTED IN PRODUCTION NOMINAL VALUE SHOWN LAST R 23 C 22 CR 7 Q 2 LAST Y X T I OS 3 LAST M 2 F 2 S 7...

Page 39: ...ATOR LEVEL 35 1 MOD I DS2 R9A 0 mIPEAK LlGHTI I 16 A2 COUNTER ASSEMBLY PJ r I I l a J I 0 I 1 I I I S2 I i O o 0 Io lIFREQ IMOD IIAMP CAL CAL BAL S2 INTERLOC KED I I A 20 0 20 19 19 18 17 2 r 21 22 R5 oo R6 R7 50 100 J8 I FREQ CAL BAL n 10 15 16 17 R8 100 A3 AMP ASS E MB LY IDE EMPHASIS I SHOWN IN FREQ CAL POSIT ION Figure 7 4 FMM l Frequency and Modulation Monitor Chassis Schematic ...

Page 40: ...BELAR ELECTRONICS LABORATORY INC ...

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