TECHNICAL MANUAL FOR COMPACT VHF DSC RM2042

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5 CIRCUIT DESCRIPTION AND SCHEMATIC DIAGRAMS RM2042CH70 CARRIER VHF CARRIER AF SIGNAL MODULATION REMARKSDETECT DETECT DETECT DETECTNo carrier detected at CH70 receiver,0 0 0 0 and no carrier detected at ext. VHF.Af signal detected because of noise.0 0 1 0 Non existing combination.No carrier detected at CH70 receiver,0 1 0 1 byt carrier detected at ext. VHF.AF signal detected from ext. VHF.No carrier detected at CH70 receiver,0 1 1 0 but carrier detected at ext. VHF.No AF signal detected from ext. VHF.Carrier detected at CH70 receiver,1 0 0 1 and no carrier detected at ext. VHF.AF signal detected from CH70 receiver.Carrier detected at CH70 receiver,1 0 1 0 and no carrier detected at ext. VHF.No AF signal detected from CH70 receiver.Carrier detected at CH70 receiver,1 1 0 1 and carrier detected at ext. VHF.AF signal detected from CH70 receiver.Carrier detected at CH70 receiver,1 1 1 0 and no carrier detected at ext. VHF.No AF signal detected from CH70 receiver.5V SUPPLYThe 5V supply is generated from the battery voltage by the series voltage regulator U11.This regulator is of the type 78L05AC, which is able to deliver a current of about 50mA without any heatsink.10V SUPPLYThe 10V supply is generated from the battery voltage by the series voltage regulator U10, which is of thetype LP2951C. The output voltage is determined by four feed back resistors (R121 to R124) and isadjustable by means of the trimming resistor R124.The LP2951C has a build-in facillity for generating an error signal, when the output voltage drops morethan 5% with respect to the programmed output voltage. This error signal is watch every one milli secondby the microprocessor to ensure a controlled power down sequence.PAGE 5-189341
5 CIRCUIT DESCRIPTION AND SCHEMATIC DIAGRAMS RM20429341PAGE 5-19
Page 1:
TECHNICAL MANUALFORCOMPACT VHF DSC
Page 5:
RM2042CONTENTS1 INTRODUCTION1.1 GEN
Page 9 and 10:
RM20421 INTRODUCTIONThe RM2042 VHF
Page 11 and 12:
1 INTRODUCTION RM20421.2 TECHNICAL
Page 13 and 14:
1 INTRODUCTION RM2042LASTThis butto
Page 15:
1 INTRODUCTION RM2042MICROPROCESSOR
Page 19:
RM2042CONTENTS2 INSTALLATION2.1 MOU
Page 22 and 23:
2 INSTALLATION RM2042H2067 MOUNTING
Page 24 and 25: 2 INSTALLATION RM2042This mounting
Page 27 and 28: 2 INSTALLATION RM20422.5 ELECTRICAL
Page 29: RM2042CONTENTS3 SERVICE3.1 MAINTENA
Page 32 and 33: 3 SERVICE RM20423.3 PROPOSAL FOR NE
Page 34 and 35: 3 SERVICE RM2042CHECK OF RECEIVER S
Page 36 and 37: 3 SERVICE RM2042CHECK OF TX AF DIST
Page 38 and 39: 3 SERVICE RM20423.6.3 ADJUSTMENT OF
Page 40 and 41: 3 SERVICE RM20423.9 NECESSARY ADJUS
Page 42 and 43: 3 SERVICE RM20423.10 PIN CONFIGURAT
Page 44 and 45: 3 SERVICE RM2042INTEGREATED CIRCUIT
Page 46 and 47: 3 SERVICE RM204271055/NEC & 82C55/O
Page 48 and 49: 3 SERVICE RM204274HC32 (SO-14 PACKA
Page 51: RM2042CONTENTS4 MECHANICAL DESCRIPT
Page 55: RM2042CONTENTS5 CIRCUIT DESCRIPTION
Page 58 and 59: 5 CIRCUIT DESCRIPTION AND SCHEMATIC
Page 85: RM2042CONTENTS6 MICROTELEPHONE INST
Page 88 and 89: 6 MICROTELEPHONE INSTALLATION RM204
Page 95 and 96: RM20427 PARTS LISTVHF DSC RM2042 SA
Page 97 and 98: 7 PARTSLIST RM2042POSITION DESCRIPT
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TECHNICAL MANUAL FOR COMPACT VHF DSC RM2042

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