Kenwood TKR-840 Service Manual

Also see for TKR-840: Brochure & specs Instruction manual

D!TTOMOD125RX U�IT (XSS-3060-XXJ-114.0dBm1ST LO465. 1MHz 60»40D (0-10)TKR-840 TKR-840LEVEL DIAGRAMBOmVrm•ICl 1 (B/2)AFOjw1DE IF STAGE!73. 05MHz 609'MOD-"•,·,� i if'""�"IC8 AFO .,2ND LO I)(11o·mvrrnaZOIC6 CNG.---<--t-_z ____C�la50 I 7 Os:'rrns--tt'H-D_E_T__-..AF VTVMI➔Ii- --- ------ --- --- --------------------- -------- ----------- --- --- ---------------- --- -- - ------- ---'CONTROL UNIT (X53-3889-l6-iTX UNIT

N3)IC3EL!-VOLAD/DA CONV,IC27LPf' LPf'IC31 (8/2) IC3l(A/2)200mVr"'•BOmVrms430mVrm11R228 X20180mVrm■(Ton•)lC37 46mVrm■ 29mVrms-o VR701Y R44. osv,,,,.Vl3 ·_CN4>f-------"'----------f-O'RAQ201AO/DA CONV.W:76mVrmsN: 92mVrmsIC27AF VTVMW:400mVrm1N:480mVrm• W:4QOmVrm1N:48O111VrmtRD�N2• MOD_;::,t-,.._➔�__ JLOADNoteIIE------------'A:.:f_:V..:T..:V :..:M__________-;,i!E----------------------'R:.:f_:V..:T..:V:..:M_________ _,,. POWIR MET ER )j I----- --- ---- �126• Because the speech output terminal reaches 12d8 SINAD when receiving high frequencies, you need anantenna input level (60% modulation)• Even though the speech output terminal reaches 4W when receiving low frequencies, you need a 1 kHz AFsignal level.• Even though the modulation reaches 60% when transmitting low frequencies, you need a 1 kHz MIC inputlevel.• Measure the level of transmitted high frequencies directly from a special quality son impedance spec trumanalyzer.FINAL/EXCITER UNIT (XS0-3050-XX 8/3),--------LJO I L302 LJOJPOWER METERCN308RF OUTRF OUM.MY LOAD50 OHM