Kenwood TK-2168 Service Manual

TK-216826■ Frequency and signallingThe set has been adjusted for the frequencies shown inthe following table. When required. re-adjust them followingthe adjustment procedure to obtain the frequencies you wantin actual operation.Frequency (MHz) K, M typeChannel No. RX Frequency TX Frequency1 155.05000 155.100002 136.05000 136.100003 173.95000 173.900004 155.00000 155.000005 155.20000 155.200006 155.40000 155.400007~16SignallingSignalling No. RX TX1 None None2 None 100Hz Square Wave3 QT 67.0Hz QT 67.0Hz4 QT 151.4Hz QT 151.4Hz5 QT 210.7Hz QT 210.7Hz6 QT 254.1Hz QT 254.1Hz7 DQT D023N DQT D023N8 DQT D754I DQT D754I9 DTMF 159D DTMF 159D10 None DTMF tone 9Adjustment FrequencyATEST CH RX TXCenter 155.050MHz 155.000MHzLow 136.050MHz 136.000MHzHigh 173.950MHz 174.000MHzLow’ 145.550MHz 145.500MHzHigh’ 164.550MHz 164.500MHz155.000MHz 155.000MHz155.200MHz 155.200MHz155.400MHz 155.400MHz• Preparations for tuning the transceiverBefore attempting to tune the transceiver, connect the unitto a suitable power supply.Whenever the transmitter is tuned, the unit must beconnected to a suitable dummy load (i.e. power meter).The speaker output connector must be terminated with a8W dummy load and connected to an AC voltmeter and anaudio distortion meter or a SINAD measurement meter at alltimes during tuning.ADJUSTMENTAdjustment points TX-RX unit (X57-672)Component side viewFoil Side ViewVR1 : Frequency adjustmentRSSI : Band-pass wave form test pointTC1 : Transmit lock voltage adjustmentTC2 : Receive lock voltage adjustmentCV : Lock voltage adjustment terminal.SP MUTERESETVR1DETBATT+ANTTXDSP–SP+PTTI(RXD)PTTOGNDAUXPTTS-1S-2RSSICVX57-672 A/2Component sideTC1 TC2ALTCVA4A3A4A1MIC ORA OA6A4GNDSBRA IMIC I5CDEOTXAFIPTTLSDFOALT2BPFANTX57-672 A/2Foil sideFig. 1 Adjustment points