KG-UV920R_Service_Manual维修电器原理图手册

Twin Band Mobile Radio Service Manual简觉问兰罩总可的出尚是日TI Structure of FrequencyThis model uses twice frequency conversion.For UHF band,the l IF is 38.85MHz,and the 2d IF is455KHz;For VHF band,the 1 IF is 29.95MHz,and he 2 IF is 450KHZ.The 1st local oscillations isprovided by PLL circuit.PLL circuit is also produced the necessary transmitting frequencies(see ChartI).A,B,C,D frequency points of Chart I are as foflowings:ANTSP11st MIX38.85H238.395MHzANTSWAMPAudioAMPPLLrocessorFINALSWPRESP2U512TCXOMIX29.25MHzMCFU460ANTMICSWAMPAudioMIcProcessorAMPPLLPREDRIVE/COTCXO14.4MHzTriplerAX2Chart IStructure ofBDFrequency(1)136-174.995MHz165.250-204.245MHz400470.995MHz429.25-500.245MHz(2)136-174.995MHz165.250-204.245MHz450-520.995MHz479.25-550.245MHz3136-174.995MHz165.250-204.245MHz245-245.995MHz274.25-275.245MHz