My QDX was working fine until I was attempting to use it to drive a 100 watt HF amplifier. ?That amp failed, spectacularly, and now the QDX has these symptoms —
1. RX is good on all bands, with decodes appearing properly?
2. ?RX RSSI bar graph previously read (typically) 35-40 dB and was green, now reads 10 dB and is red.?
3. ? RX filter sweep is normal for all 4 filters
4. ?Attempts to transmit instantly shuts down the 9 volt 1 amp power supply after which the QDX restarts with the 5 second sequence and returns to normal receiver operating, albeit low sensitivity ??
I assume something in the common path is damaged such as the LPF switching, T/R switch or perhaps the transmitter final(s). ?
Suggestions for troubleshooting and fault isolation?
N6JH
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