Kenwood TS-950S Service Manual

Also see for TS-950S Digital: Instruction manual Instruction manual Instruction manual Instruction manual Service manual

TS-950S/SD CIRCUIT DESCRIPTION+ IF filter switching(455 kHz : Signal unit, 8.83 MHz: IF unit)The IF filter switching signal from the digital unit issent to the signal unit as 10-bit serial data. In thesignal unit, serial-to-paraliel converter IC8 (TC9174F)converts the serial data to parallel data to select the8.83-MHz filter and the 455 kHz IF filter. IF filter selectdata is stored in memory as a portion of the VFO datafor each mode.The optional IF filter data is set by S1 of the digitalThe 8.83 MHz 270-Hz filter has no dedicated con-nection pointed is mounted in the same place as the8.83 MHz 500 Hz filter position. 500 Hz and 270 Hz arerecognized by the DIP switch, but they cannot be usedat the same time.IF UNIT(X48-3060-00)1 |N10 NAaero 1 oaSWon: There is a filter8.83-500 455-2.4K, 455-500|| ||||||||+ Transmit LPF, AT band data (LPF unit, AT unit)Transmitter system band data (LPO to LP3) from thedigitalunitisbuffered byQ8andQ9ofthedigitalunit.Thedataisthenforwardedtothefilterunit.Theselect.h=ea..fj—»8.83-EOOIOPTION)unit,sothatfilterpositionswithoutfiltersarenotse-sare|lealoihBs<1.pioetiONlected.Bare6.83-2.7KpeersS8FBiof44 8.83~GK(OPTION)|BBFAI5/5Slo>8.93-FMISKDIGITALUNIT|jouTsOUT?FMINC(X46-3050-XX)foursouTécnoft—_—-——|loutiaoutsass-FM6K|BSe|oeSOOUT4}-———-_»455~250(OPTION)|ppsp—SPloft41otBeRouter455-6K|.pea}STBioh23VfcKouT2*455-SOO;OPTION?=ppPSK[32rtstgOUTt=455-2.7K|SVPEWeeG|LnaSERIAL/PARALLELCONV,|SIGNALUNIT(X57-3380-00}FORSERVICEMANUALSCONTACT:MAURITRON TECHNICAL SERVICESwww.mauritron.co.ukTEL: 01844 - 351694FAX: 01844 - 352554Fig. 36 !F filter switchingsignaldividedanddecodedbythefilterunitselectsTXLPFinthefilterunitandtheATBANDoftheATunit.For theappropriatebanddata,see theaccompanyinglist.15v|—>me75~10.5|Qi2sase2(y)aeY76INtoote21.5~ 30.0YSofwz92]+f+fraeMiecNeo5WINS33o—me40~77.5¢aeP37;omLEoie*e—54Ina@04¢DtP36CaiLP2ofs3tIcz¥3Ins305+fofer14.5~21.5P35RomBELgit2aaesv2ine=Ge--25~4.0a8LPO],|51=|ueP34peIn?&O7-—e105~14.51|LOTClENinaOB16~ 2.5ic?tL[=—vs6eeCNTg1folioatDECOOERDRIVER240j25aT340l2eaT=|7aT ATBANDDATA316heat ATUNITShojatarDIGITAL UNITFILTERUNITaneapace(X81-3060-XX)eeoaaosL42 Fig. 37 Transmit LPF, AT band data