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Project TS-930S

...after a contest it seemed that the TS-480 lost at least 20dB of its sensitivity. After a brief check of the circuits, I got a clue where to check...

after applying a reference signal to the antenna socket I measured about 18dB less on receivers input. So the defect must be somewhere inbetween.

undressing the radio

undressing the radio

An Overview of the RF-board. The defect must be somewhere in the highlighted area

the transistor grounding the receiver-input while TX was burnt, a diode was even completely missing and the PCB track burnt.

After replacing the transistor, and two diodes, everything was at it should be. The TS-480 now is ready for the next contest :)