Icom IC-7100 Service Manual

Also see for IC-7100: Finger touch operation Specification Basic Manual Advanced instructions Instruction manual

Contents

Icom IC-7100 Service Manual Manual pdf 15 page image

3-6To the band filter circuitHP FLPFHP FBPFRFAMPBRFHPFD3252,D3253HP FATT BP FLP FBPFRFAMP LP FLPFHP FHP FBP FATTHP F13.9-20.9MHzf c=500MHz1.6-2.0MHzBW=20MHz3.5dB2.0-3.4MHz6.9-13.9MHz1LO3.4-6.9MHzBW=10MHz144-148MHz430-450MHzHF BAND ->VHF/UHF BAND -> BW=20MHz0.03-1.6MHzUHF: 524.487-594.487MHz40.0-60.0MHz1.6-74.8MHz60.0-74.8MHzHF/VHF: 124.517-324.487MHz20.9-40.0MHzfc=500MHzf0=146MHzfc=74.8MHz1st MIXER VUHF/HFTXFrom the 2nd TX IF circuitFI3051FI3052IC3051D32726dB IC3031MAIN UNIT1ST TX IF CIRCUIT (MAIN UNIT)The 1st TX IF signal from the 2nd TX IF circuit is applied tothe 1st TX mixer (D3252 and D3253), then mixed with the 1stTX LO signal, resulting in a signal at the TX frequency.The converted TX signal is applied to the TX amplifi er circuit.• While operating on the HF, 50 MHz and 70 MHz bands -The TX signal is passed through the LPF (L3261 to L3263,C3216 to C3267) and one of the BPFs, depending on theoperating frequency, to remove unwanted signals.The fi ltered signal is applied to the TX power amplifi er cir-cuit.• 1st TX IF CIRCUIT• While operating on the 144 MHz and 430 MHz bands -The TX signal is passed through the LPF (L3261 to L3263,C3216 to C3267) and BRF (D3272, L3271, L3272, C3271 toC3273).• 144 MHz band signalThe TX signal is passed through the 3 dB attenuator (R3035to R3037) and 146 MHz BPF (MAIN UNIT: L3032 to L3035,C3036 to C3046), and then amplifi ed by the RF AMP(IC3031).The amplifi ed signal is applied to the TX power amplifi er cir-cuit.• 430 MHz band signalThe TX signal is passed through the 3.5 dB attenuator (R3052to R3054), and amplifi ed by the RF AMP (IC3051). The am-plifi ed TX signal is sequentially passed through the BPF(FI3052), LPF (L3052, C3053, C3054) and BPF (FI3051).The fi ltered signal is applied to the TX power amplifi er cir-cuit.