B5DM513Wireless Intercom

Telex Op er ating In struc tions PRO FES SIONAL WIRELESS IN TER COM SYS TEM TR-300, TR-300P, BTR-300, BTR-300B TA BLE OF CON TENTS IN TRO DUC TION..............................................................................................................................1 GEN ERAL DE SCRIP TION............................................................................................................1 BTR-300 BASE STATION TRANS CEIVER..................................................................................3 TECH NI CAL IN FOR MA TION......................................................................................................3 SPEC I FI CA TIONS..................................................................................................................3 FEA TURES..............................................................................................................................4 CON TROLS AND CON NEC TIONS..............................................................................................5 FRONT PANEL.......................................................................................................................5 REAR PANEL.........................................................................................................................6 TR-300 BELT-PACK TRANS CEIVER...........................................................................................9 TECH NI CAL IN FOR MA TION......................................................................................................9 SPEC I FI CA TIONS..................................................................................................................9 FEA TURES............................................................................................................................10 CON TROLS AND CON NEC TIONS............................................................................................10 EX TER NAL CON TROLS ...................................................................................................10 IN TER NAL CON TROLS.....................................................................................................12 EQUIP MENT SET-UP....................................................................................................................13 UN PACKING................................................................................................................................13 AN TENNA IN FOR MA TION........................................................................................................13 AN TENNA CON NEC TIONS...............................................................................................13 AN TENNA PO LAR IZA TION..............................................................................................14 DIS TANCE BE TWEEN AN TENNAS.................................................................................14 AN TENNA PLACE MENT...................................................................................................15 IM PROVING RE CEP TION/IN CREASING RANGE..........................................................16 BTR-300 SET-UP..........................................................................................................................17 LO CA TION............................................................................................................................17 IN TER NAL IN TER COM SWITCHES.................................................................................17 RACK MOUNTING..............................................................................................................19 LO CAL HEAD SET CON NEC TION....................................................................................21 HEAD SET MIC SE LECT SWITCH.....................................................................................21 TRANS MIT SWITCH...........................................................................................................21 IN TER CON NEC TION TO A HARD-WIRED IN TER COM...............................................22 AUX IL IARY AU DIO CON NEC TION.................................................................................23 POWER CON NEC TION.......................................................................................................23 DUMMY LOAD....................................................................................................................23 TR-300 SET-UP.............................................................................................................................24 HEAD SET CON NEC TION..................................................................................................24 DY NAMIC/ELECTRET MIC SWITCH..............................................................................24 BAT TERY IN STAL LA TION................................................................................................25 -i- TA BLE OF CON TENTS (CONT.) PRE-WALK-THRU CHECK LIST................................................................................................26 SYS TEM OP ER A TION..................................................................................................................27 BTR-300 OP ER A TION.................................................................................................................27 POWER..................................................................................................................................27 LO CAL HEAD SET VOL UME.............................................................................................27 PUSH TO TALK/LOCK TO TALK SWITCH......................................................................27 TR-300 OP ER A TION....................................................................................................................28 POWER...................................................…

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TR-300A BLOCK DIAGRAM LPFCOMPAND LIMITER PREEMP MOD GERBER BY 8 DIVIDE MIXERVCOAMPAMPOUTPUTAMP MIC IN 150-174 MHZ(PART 90) 174-216 MHZ(PART 74) 18.75-21.75 MHZ(PART 90) 21.75-27 MHZ(PART 74) TR-300A ACTIVE DEVICES DES DEVICE FUNCTION 1. Q1 SST175 Variable resistor 2. Q2 MMBT3906 Rectifier 3. Q3 SST177 Gate 4. Q4 VP0610 Switch 5. Q5 MMBFJ309 Oscillator 6. Q6 FMMT5179 Buffer 7. Q7 VP0610 Switch 8. Q8 MMUN2212 Switch 9. Q9 FMMT5179 Buffer 10. Q10 MMBR901 RF Power amplifier 11. U1 TLV2361 Amplifier 12. U2 NE575 Compandor 13. U3 78L05 Voltage regulator 14. U4 NE612 Oscillator/mixer 15. U5 UPB1509 Divide by eight

ID LABEL LOCATION

TR-300A OPERATIONAL DESCRIPTION Transmit Receive Signals from the receive antenna proceed through 3 tuned circuits, Q101, and 3 more tuned circuits to mixer Q103. Oscillator Q102 is a Colpitts with the collector tuned to the second harmonic. Y101 operates on the fifth overtone with C112 and L107 acting as mode suppressor. From the mixer the signal continues through FL101 to second mixer U101A. This downconverts the 10.7 MHz signal to 455 kHz. After passing through FL102, the signal is limited and detected by U101B. U101B contains a quadrature detector which is tuned by L109. U101C functions as a 16kHz bandpass filter for operating the squelch. With no signal a large amount of noise is present at U101 pin 11 and this is rectified by D101, lowering the voltage at pin 12 to less than .65 volt. This switches pin 14 to ground and mutes the audio. R122 adjusts the bias current through R121, R120 and D101 and is used to set the squelch point. De-emphasis is provided by R117,R125, and C128. U2A is an amplifier whose gain is controlled by the level of audio entering the rectifier at pin 4. As the level here increases, the gain is increased and this results in a 2:1 expansion characteristic, which reverses the processing done in the transmitter. R159 is the user volume control and U105 drives the headset.

770604.rep Bill of Materials PARTS LIST Quan Type Value Ref Designators ======================================================================== 1 1509 UPB1509 U5 1 575EC NE575 U2 1 612 NE612 U4 1 78LD 78L05 U3 1 8DA TLV2361 U1 6 C 100PF C10,C12,C16,C3,C6,C9 12 C .01UF C14,C26,C33,C35,C36,C37, C42,C47,C53,C55,C57,C58 3 C .1UF C2,C24,C27 1 C 47PF C31 1 C 68PF C32 4 C .001UF C34,C38,C48,C63 1 C 33PF C39 7 C * C40,C49,C51,C59,C60,C61, C62 1 C 4.7PF C41 1 C 1.5PF C44 06-Oct-99 10:50 Page 1 Bill of Materials 770604.S01 Page 1 770604.rep Quan Type Value Ref Designators ======================================================================== 1 C 8.2PF C45 2 C 2.2PF C46,C52 2 C 10PF C54,C56 1 C .0039UF C64 5 CE 10UF C1,C13,C21,C23,C30 13 CE 1UF C11,C15,C17,C19,C20,C25, C28,C29,C4,C5,C50,C7,C8 2 CE 100UF C18,C43 1 CE 4.7UF C22 6 D TMPD4148 D1,D3,D4,D5,D6,D8 1 DV FMMV105 D2 1 DV FMMV109 D7 7 E VAL E1,E2,E3,E4,E5,E6,E7 1 JH J1-1 J1 1 LA .47UH L2 2 LA 1.2UH L3,L6 06-Oct-99 10:50 Page 2 Bill of Materials 770604.S01 Quan Type Value Ref Designators ======================================================================== 4 LA * L4,L7,L8,L9 Page 2 770604.rep 1 LA .18UH L5 2 LVA VAL L1,L10 1 QN2212 MMUN2212 Q8 1 QNDSG MMBFJ309 Q5 1 QNEBC MMBR901 Q10 2 QNEBC FMMT5179 Q6,Q9 1 QPDSG SST175 Q1 1 QPDSG SST177 Q3 1 QPEBC MMBT3906 Q2 2 QPT VP0610 Q4,Q7 2 R 39.2K R1,R12 5 R 1K R10,R3,R48,R5,R6 2 R 4.7M R11,R14 06-Oct-99 10:50 Page 3 Bill of Materials 770604.S01 Quan Type Value Ref Designators ======================================================================== 2 R 22.1K R13,R21 2 R 976K R15,R32 3 R 47.5K R16,R30,R35 Page 3 770604.rep 2 R 30.1K R17,R18 7 R 10K R19,R2,R33,R39,R4,R49, R8 1 R 1.5K R20 1 R 15K R22 1 R 49.9K R23 1 R 3.01K R24 1 R 4.99K R25 4 R 100K R26,R31,R46,R9 3 R 3.92K R27,R28,R29 1 R 392 R34 4 R 100 R36,R41,R44,R52 3 R 221 R37,R42,R43 06-Oct-99 10:50 Page 4 Bill of Materials 770604.S01 Quan Type Value Ref Designators ======================================================================== 1 R 47.5 R38 1 R 4.75K R40 1 R 82.5K R45 2 R 475 R47,R50 1 R 10 R51 Page 4 770604.rep 1 R 5.62K R53 1 R 6.81K R7 1 RVA 100K VR1 1 RVA 5K VR2 1 SSD VAL S1 5 TP TP1,TP2,TP3,TP4,TP5 1 Y Y1 Total Parts: 167 06-Oct-99 10:50 Page 5 Page 5 TR300A TUNE-UP INFO Feed 1.5mv at 1kHz to J1-1(hot) and J1-2(gnd). Ground J1-8. Feed 9vdc to J1-11(+) and J1-10(-). Connect a frequency counter and modulation meter from pad E7 to ground. Connect a DC voltmeter to TP2. Set VR1 to maximum clockwise. Tune L1 and observe frequency counter and voltmeter. When loop is out of lock, the frequency will change but the loop voltage will be constant(about 3.3V). When the loop locks, the loop voltage will vary in an S curve either side of the unlocked value but the frequency will not change. Center the loop at this point by adjusting for the same loop voltage as existed in the unlocked condition. Adjust L10 for correct frequency. Adjust VR2 for +/- 3kHz deviation.

J1-11 J1-10 VP0610 Q7 TP5 TP4 TP3 TP2 TP1 .001UF C63 E7 100K R31 976K R32 E6 E5 J1-8 TMPD4148 D4 TMPD4148 D5 .01UF C57 VP0610 Q4 TMPD4148 D3 C52 2.2PF R43 221 TMPD4148 D6 Y1 3.92K R27 C30 10UF + L10 10K R33 FMMV109 D7 47.5K R30 3.92K R28 .0039UF C64 3.92K R29 C29 1UF + R25 4.99K R26 100K Q3 SST177 3.01K R24 C50 1UF + MMUN2212 Q8 22K 22K TMPD4148 D8 100 R52 .01UF C35 1UF C28 + 5K VR2 5.62K R53 68PF C32 47PF C31 .01UF C37 NE612 U4 31 2 7 6 8 5 C1 10UF + 1K R3 10K R2 C23 10UF + J1-2 E3 E4 10K R8 C8 1UF + E2 E1 C15 1UF + 39.2K R12 J1-5 1UF C11 + R7 6.81K U2:A NE575 6 7 4 9 10 5 G 10K10K 3.9K J1-6 1UF C5 + .1UF C24 U3 78L05 IN OUT GND J1-7 TMPD4148 D1 C21 10UF + 47.5K R16 C20 1UF + 976K R15 4.7M R14 Q1 SST175 .01UF C14 4.7M R11 C13 10UF + C7 1UF + 1K R6 100PF C9 100PF C10 1K R10 100K R9 100PF C12 NE575 U2:D 17 18 19 100K VR1 1K R5 100PF C6 U1 TLV2361 4 2 5 1 3 10K R4 C4 1UF + 100PF C3 S1 .1UF C2 39.2K R1 J1-1 1UF C19 + 100UF C18 + 49.9K R23 NE575 U2:B 3 1 2 U2:C NE575 1314 11 16 10K 3.9K 10K G 2012 8 15 4.7UF C22 + R18 30.1K R17 30.1K 1UF C17 + R13 22.1K C25 1UF + .01UF C26 10K R19 1.5K R20 Q2 MMBT3906 22.1K R21 15K R22 .1UF C27 C16 100PF 100 R41 .01UF C47 100 R36 33PF C39 .01UF C42 C43 100UF + L1 * C40 475 R47 .01UF C55 82.5K R45 .01UF C53 10 R51 .01UF C58 * L9 * L8 * L7 * C62 * C61 * C60 * C59 R35 47.5K D2 FMMV105 C41 4.7PF C45 8.2PF C44 1.5PF MMBFJ309 Q5 L2 .47UH R37 221 R38 47.5 C46 2.2PF R39 10K R40 4.75K Q6 FMMT5179 C48 .001UF R42 221 L3 1.2UH C49 * L4 * C51 * R44 100 C54 10PF Q9 FMMT5179 R46 100K L5 .18UH R48 1K C56 10PF R50 475 R49 10K Q10 MMBR901 L6 1.2UH C38 .001UF U5 UPB1509 1 8 7 2 3654 C36 .01UF C34 .001UF C33 .01UF R34 392 TR-300A 879240-(T.H) 879239-(SMT) TRANSMIT PUSH TO 47NH 56NH 47NH 56NH22PF 18PF 22PF C62L9L8L7L4 150NH150NH 120NH120NH 100NH100NH 68NH68NH 27PF 33PF 33PF 27PF 27PF 33PF NO PART 1.8PF 1.8PF C40 150-175 MHZ 175-195 MHZ 195-216 MHZ C61C60C59C51C49 *FREQUENCY DEPENDENT COMPONENTS 15PF 12PF 15PF 4.7PF 5.6PF 6.8PF 4.7PF 5.6PF 6.8PF DEVIATION RB TRANSMIT BOARD 3/15/99 SIDETONE TRANSMITTED SIDETONE INTERNAL 770604 770604 PAPRE-PRODUCTION10/05/99SBC SBC 10/05/99 D SHT REV STATUS REV SHEET 4321 = .050 IN = .030 IN = .010 IN DESCRIPTIONQTY PART NO hy-gain O RO R TELEX TELEX COMMUNICATIONS INC. Lincoln Nebraska U.S.A This drawing, written description or specification represents a proprietary product of TELEX, Lincoln, NE., and shall not be released, disclosed, nor duplicated without the written permission of TELEX. NEXT ASSY. USED ON ITEM PROD APPD. CHK BY DR BY DATE SHEET SIZE TITLE MATERIAL: DESIGNATOR DWG.NO. 57010 CODE IDENT SCALE APPLICATIONS ANGLES 1 : BENDS 2 STRAIGHTNESS AND/OR FLATNESS .005 IN./1 IN. CONCENTRICITY .010 TIR UNMARKED ANGLES, BENDS o AND INTERSECTIONS 90 THREADS- EXT. CLASS 2A INT. CLASS 2B - + + + - - oo + - + 64 FINISH: MACHINED - FRACTION: .XXX .XX .X DECIMAL: UNSPECIFIED LIMITS OF TOLERANCE APPDDATECHG NOLTRDESCRIPTION REVISIONS NOTES: