Motorola CD202 Manuale Utente Scaricare il pdf

LBI-38910

Printed in U.S.A

MAINTENANCE MANUAL

ORION

VHF SYNTHESIZER/RECEIVER/EXCITER BOARD

B19/CMN-352 A/B

TABLE OF CONTENTS

Page

DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Front Cover

CIRCUIT ANALYSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Front Cover

Frequency Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Exciter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

IC DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Receiver/Exciter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

COMPONENT IDENTIFICATION CHARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

OUTLINE DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Receiver/Exciter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

DESCRIPTION

The ORION Synthesizer/Receiver/Exciter board pro-

vides, on one printed circuit board, circuits for the synthe-

sizer, receiver and transmitter exciter. The synthesizer

circuit generates transmit frequencies for two ranges. Range

A (or Part 1) is 136-153 MHz, and range B (or Part 2) is

150-174 MHz. Receiver injection frequencies are also gen-

erated by the synthesizer of 181.1-219.1 MHz.

The receive circuit is an FM dual-conversion, super-het-

erodyne receiver designed for operation in the 136-174 MHz

frequency range. Regulated 9 Volts is supplied to all re-

ceiver stages except the audio PA integrated circuit which

operates from the switched A+ supply.

The receiver has Intermediate Frequencies (IF’s) of 82.2

MHz and 455 kHz. Adjcent channel selectivity is obtained

by two band-pass filters, an 82.2 MHz crystal filter, and a

455 kHz ceramic filter.

The receiver circuit, except for the synthesizer circuit,

consists of:

• Front End Mixer

• 45.1 MHz 1st IF, 455 kHz 2nd IF and FM Detector

• Audio Signal Processor (ASP) including squelch

• Audio PA

The receiver Front End and Mixer Circuits are on the

Synthesizer/Receiver/Exciter board. The 82.2 MHz 1st IF

and the 455 kHz 2nd IF, FM Detector, ASP and Audio PA

circuits are on the System Control/IF Board (refer to Mainte-

nance Manual LBI-38906).

1 2 3 4 5 6 ... 13 14

Sommario

Pagina 1 - B19/CMN-352 A/B

LBI-38910Printed in U.S.AMAINTENANCE MANUALORIONVHF SYNTHESIZER/RECEIVER/EXCITER BOARDB19/CMN-352 A/BTABLE OF CONTENTSPageDESCRIPTION . . . . .

Pagina 2 - CIRCUIT ANALYSIS

PARTS LISTSYMBOL EGE PART NO. DESCRIPTIONC489A B19/5CAAA03408 Ceramic: 12 pF ±5% 50 VDCW, temp coef 060 PPM (Used in B).C489B B19/5CAAA0±3004 Ceramic:

Pagina 3

COMPONENT IDENTIFICATION CHARTSYNTHESIZER RECEIVER/EXCITER∆ COMPONENT IDENTIFICATION CHARTSYMBOL A136~153MHzB150~174MHzC241 18pF (UJ) 22pF (UJ)C260 4p

Pagina 4

OUTLINE DIAGRAMSYNTHESIZERRECEIVER/EXCITERCOMPONENT SIDESOLDER SIDECOMPONENT SIDESOLDER SIDELBI-38910 LBI-3891011

Pagina 5 - Exciter Circuit

SCHEMATIC DIAGRAMSYNTHESIZERLBI-38910 LBI-3891012

Pagina 6

SCHEMATIC DIAGRAMRECEIVER/EXCITERLBI-38910 LBI-3891013

Pagina 7

The exciter circuit consists of two wide-band amplifierstages operating over a frequency range of 136-174 MHz with-out any tuning. The Exciter circui

Pagina 8

Frequency Segment SelectorThe Frequency Segment Selector, operating under con-trol of the microcomputer, switches capacitance in and out ofthe Tx and

Pagina 9

Figure 1 - Synthesizer Block Diagram Figure 2 - Receiver Block DiagramLBI-38910 LBI-389103

Pagina 10 - LBI-38910 LBI-38910

2nd MixerThe 45.1 MHz IF input is applied to transistor TR505 andmixed with a 44.645 MHz frequency supplied by crystal oscil-lator X501. Inductor L52

Pagina 11 - SYNTHESIZER RECEIVER/EXCITER

IC DATARF WIDE BAND AMPLIFIER IC151B19/5DDAC00946 (NEC UPC1678G)POSITIVE VOLTAGE REGULATOR IC152B19/5DAAN00644 (JRC NJM78LO6UA)SYNTHESIZER IC201B19/5D

Pagina 12

IC DATABILATERAL SWITCH IC204, IC209B19/5DAAJ00629 (MOTOROLA MC14066BF)RF WIDE BAND AMPLIFIER IC206B19/5DAAA00284 (NEC UPC1676G)DUAL COMPARATOR IC207

Pagina 13 - SYNTHESIZER

SYNTHESIZER BOARDSYNTHESIZER SECTIONCMN-352A2W (Used in 344A4577P1)CMN-352B2W (Used in 344A4577P2)PARTS LISTSYMBOL EGE PART NO. DESCRIPTIONC201 B19/5

Pagina 14 - RECEIVER/EXCITER

PARTS LISTSYMBOL EGE PART NO. DESCRIPTIONR244 B19/5RDAC02474 Metal film: 1.5K ohms ±5% 100 VDCW 1/10W.R245 B19/5RDAC02554 Metal film: 120 ohms ±5% 100