Motorola HT Series Service Manual page 34

Professional series two-way portable radio
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Voltage
Multiplier
Vmult1
Synthesizer
Vmult2
16.8 MHz
Ref. Osc.
Modulating
Signal
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 LQGLFDWHV WR WKH PLFURSURFHVVRU WKDW WKH V\QWKHVL]HU LV ORFNHG
7UDQVPLW PRGXODWLRQ IURP WKH $6),& LV VXSSOLHG WR 8 SLQ  ,QWHUQDOO\ WKH DXGLR LV GLJLWL]HG E\
WKH /9 )UDF1 ,& DQG DSSOLHG WR WKH ORRS GLYLGHU WR SURYLGH ORZSRUW PRGXODWLRQ 7KH DXGLR UXQV
WKURXJK DQ LQWHUQDO DWWHQXDWRU IRU PRGXODWLRQ EDODQFLQJ SXUSRVHV EHIRUH JRLQJ RXW DW SLQ  WR WKH
9&2
 6\QWKHVL]HU
7KH /RZ 9ROWDJH )UDFWLRQDO1 /9 )UDF1 V\QWKHVL]HU VKRZQ LQ
 0+] FU\VWDO < WR SURYLGH D UHIHUHQFH IRU WKH V\VWHP 7KH /9 )UDF1 ,& 8 IXUWKHU
GLYLGHV WKLV WR  0+]  0+] DQG  0+] DV UHIHUHQFH IUHTXHQFLHV 7RJHWKHU ZLWK &
& & 5 DQG ' WKH\ EXLOG XS WKH UHIHUHQFH RVFLOODWRU WKDW LV FDSDEOH RI  SSP
VWDELOLW\ RYHU D WHPSHUDWXUH UDQJH RI  WR  ° & $  0+] VLJQDO DW 8 SLQ  LV DOVR
SURYLGHG IRU XVH E\ $6),& DQG /9=,)
7KH ORRS ILOWHU ZKLFK FRQVLVW RI & & 5 5 DQG 5 SURYLGHV WKH QHFHVVDU\
GF VWHHULQJ YROWDJH IRU WKH 9&2 DQG GHWHUPLQHV WKH DPRXQW RI QRLVH DQG VSXU SDVVLQJ WKURXJK
,Q DFKLHYLQJ IDVW ORFNLQJ IRU WKH V\QWKHVL]HU DQ LQWHUQDO DGDSW FKDUJH SXPS SURYLGHV KLJKHU FXUUHQW
DW 8 SLQ  WR SXW WKH V\QWKHVL]HU ZLWKLQ ORFN UDQJH 7KH UHTXLUHG IUHTXHQF\ LV WKHQ ORFNHG E\
QRUPDO PRGH FKDUJH SXPS DW SLQ 
%RWK WKH QRUPDO DQG DGDSW FKDUJH SXPSV JHW WKHLU VXSSO\ IURP WKH FDSDFLWLYH YROWDJH PXOWLSOLHU
PDGH XS RI & WR & DQG WULSOH GLRGHV ' DQG ' 7ZR 9 VTXDUH ZDYHV 
GHJUHHV RXW RI SKDVH DUH ILUVW PXOWLSOLHG E\ IRXU DQG WKHQ VKLIWHG DORQJ ZLWK UHJXODWHG 9 WR EXLOG XS
9 DW 8 SLQ 
VCP
Aux3
U3701
MOD Out
)LJXUH  9+) )UHTXHQF\ *HQHUDWLRQ 8QLW %ORFN 'LDJUDP
Dual
TRB
Transistor
Rx VCO
Circuit
Loop
Filter
Tx VCO
Circuit
7KHRU\ RI 2SHUDWLRQ 6\QWKHVL]HU
Rx Out
VCOBIC
U3801
Tx Out
Figure 2-13 on page 2-17
To Mixer
To PA Driver
 XVHV D

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