Kenwood TK-90, Руководство по обслуживанию

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TK-90
37
Ref. No. Use / Function Operation / Condition
Q708 Doubler 31.2MHz x 2
Q709 Buffer 15.6MHz buffer
Q711 Doubler 15.6MHz x 2
Q712 Buffer DDS output buffer
Q713 VCO1 Oscillation FET
Q714 VCO2 Oscillation FET
Q715 Amplifier VCO output amplifier
Q716 Amplifier PLL-fin amplifier
Q717 Ripple filter Ripple filter for VCO power supply
Q718,719 Switching VCO select switch
Q720 Ripple filter Ripple filter for VCO power supply
Q851,852 Inverter TS signal for KAT-1
Q853,854 Inverter TT signal for KAT-1
Q855 Inverter IGN control switch
Q856 Switching Power supply voltage protection
Q858 Switching Selcall function adjust mode
Q859 Switching Selcall function
Q991,992 Switching FAN control switch
Q993 inverter PTT signal
Q994,995 Switching FAN control switch
D1~4 Limiter Over input protection
D5 Switching ON when receiving over
1.605MHz is selected
D6 Switching ON when receiving under
1.605MHz is selected
D7 Switching ON during transmission
D8 Switching ON when receiving over
1.605MHz is selected
D9 Switching ON when BPF of 10.5~14.5MHz
is selected
D10 Switching 1/2: ON when BPF of
14.5~21.5MHz is selected
2/2: ON when BPF of
4.1~7.5MHz is selected
D11 Switching 1/2: ON when BPF of
1.605~2.5MHz is selected
2/2: ON when BPF of
2.5~4.1MHz is selected
D12 Switching 1/2: ON when BPF of
7.5~10.5MHz is selected
2/2: ON when BPF of
21.5~30MHz is selected
COMPONENTS DESCRIPTION /
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