LBI-38910Printed in U.S.AMAINTENANCE MANUALORIONVHF SYNTHESIZER/RECEIVER/EXCITER BOARDB19/CMN-352 A/BTABLE OF CONTENTSPageDESCRIPTION . . . . .
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:
COMPONENT IDENTIFICATION CHARTSYNTHESIZER RECEIVER/EXCITER∆ COMPONENT IDENTIFICATION CHARTSYMBOL A136~153MHzB150~174MHzC241 18pF (UJ) 22pF (UJ)C260 4p
OUTLINE DIAGRAMSYNTHESIZERRECEIVER/EXCITERCOMPONENT SIDESOLDER SIDECOMPONENT SIDESOLDER SIDELBI-38910 LBI-3891011
SCHEMATIC DIAGRAMSYNTHESIZERLBI-38910 LBI-3891012
SCHEMATIC DIAGRAMRECEIVER/EXCITERLBI-38910 LBI-3891013
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
Frequency Segment SelectorThe Frequency Segment Selector, operating under con-trol of the microcomputer, switches capacitance in and out ofthe Tx and
Figure 1 - Synthesizer Block Diagram Figure 2 - Receiver Block DiagramLBI-38910 LBI-389103
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
IC DATARF WIDE BAND AMPLIFIER IC151B19/5DDAC00946 (NEC UPC1678G)POSITIVE VOLTAGE REGULATOR IC152B19/5DAAN00644 (JRC NJM78LO6UA)SYNTHESIZER IC201B19/5D
IC DATABILATERAL SWITCH IC204, IC209B19/5DAAJ00629 (MOTOROLA MC14066BF)RF WIDE BAND AMPLIFIER IC206B19/5DAAA00284 (NEC UPC1676G)DUAL COMPARATOR IC207
SYNTHESIZER BOARDSYNTHESIZER SECTIONCMN-352A2W (Used in 344A4577P1)CMN-352B2W (Used in 344A4577P2)PARTS LISTSYMBOL EGE PART NO. DESCRIPTIONC201 B19/5
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
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