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FT-7900R_SM_USA_EXP_EH016M93A
無銘軒BI4KYT
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VHF Reception
The incoming VI IF signal is passed through a low-pass
filter network，antenna sw itc hingdiodes D1074 （RLS135），
D1075 （RLS135） and D1015 （HVC131），and another low-
pass filter network to the RF amplifier Q1008（3SK296ZQ）。
The amplified RF signal is passed through a varactor con-
trolled bandpass filter consisting of L1017，L1018，and
D1010，D1011，and D1012 （all HVC365），then applied to
the first mixer Q1009 （3SK296ZQ） along w ith the first
local signal from the PLL circuit.
The first local signal is generated between 189.05 MHz
and 193.05 MI 1z，depending on the receiving frequency，
by the VHF \ C O，w hic h consistsof Q1076（2SC5374） and
varactor diodes D1049 （HVC365），D1050 （HVC131），
D1051（HVC365），and D1052 （HVC362）。
UHF Reception
The incoming UHF signal is passed through a low-pass
filter network，antenna switching diodes D1077
（MA4P1250） and D1018（RLS135），D1019（RLS135），and
D1084 （HSC277），and another low-pass filter network to
the RF amplifier Q1001（3SK296ZQ）.The amplified RF
signal is passed through a varactor-controlled band-pass
filter consisting of L1006 and L1007，and D1002，D1003，
and D1004 （all HVC350B），then applied to the first mixer
Q1002 （3SK296ZQ） along w ith the first local signal from
the PLL circuit.
The first local signal is generated between 384.95 MI Iz
and 404.95 MHz，depending on the receiving frequency，
by the UHF V CO，w hich consists of Q1072 （2SC5006）
and varactor diodes D1046 （HVC375B） and D1047
（HVC350B）.
.
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