Kenwood TK-5810 Service Manual

Also see for FleetSync TK-5810(H): Instruction manual Specifications Service manual Instruction manual

TK-5810 (BG) /5810H (BG)25Fig. 4 2nd IFW/N2 W/N2W/N1 W/N1SWIC205FM/P25 DETL234SWIC201NARROW/P25CF200SWIC206SWDETDETCOILIC202WIDECF201SWIC203SWIC2072nd IF450kHz1st IF49.95MHz2nd Local OSC50.4MHzIC209FM ICNARROWCF204WIDECF202CIRCUIT DESCRIPTION3-3. 1st IFThe 1st IF signal passes through the MCF (MonolithicCrystal Filter) to remove unwanted signal.The MCF has two paths (Wide band: XF201, Narrowband: XF200), and these are controlled with the IF filterswitch (D208, D209, D210, D211, D212, D213, D214 andD215).The signal passes through the MCF (XF201) when theWide band (D209, D211, D213 and D215 are ON) is se-lected. The signal passes through the MCF (XF200) whenthe Narrow band (D208, D210, D212 and D214 are ON) isselected.The 1st IF signal passing through these MCFs is ampli-fied by the IF amplifier (Q205) and goes into the FM IC(IC209).3-4. 2nd LocalThe 1st IF signal (49.95MHz) amplified by the IF ampli-fi er (Q205) and the 2nd local signal (50.4MHz) generated bytripling the reference oscillator frequency (16.8MHz) of theVCXO (X200) by Q207, are mixed in the FM IC (IC209) toproduce a 2nd IF signal (450kHz) (Upper heterodyne).Fig. 3 1st IF and 2nd local2nd IF450kHz1st IF49.95MHz16.8MHz2nd Local50.40MHzSWQ205 Q204D214D215VCXOTriplerQ207SWD212D213NARROWXF200WIDEXF201SWD210D211SWD208D209NARROWXF200WIDEXF201FM ICIC209X2003-5. 2nd IFThe 2nd IF signal passes through the ceramic filter to re-move unwanted signal.The ceramic filter has two paths (Wide band: CF201 andCF202, Narrow/P25 band: CF200 and CF204), and theseare controlled with the multiplexers (IC201, IC202, IC203,IC205, IC206 and IC207).The control line is W/N1, W/N2 and VN.The signal passes through the ceramic filters (CF201 andCF202) when the Wide band (W/N1: high level, W/N2: highlevel, VN: high level) is selected. The signal passes throughthe ceramic filters (CF200 and CF204) when the Narrow/P25 band (W/N1: low level, W/N2: low level, VN: high level)is selected.After that, the signal is fed into ASIC (IC708) through ce-ramic fi lter (CF100), and then, the signal is demodulated inASIC and the AF signal is dealing with DSP (IC701).