Just finished my 30M QCX last night. The receiver seems DEAD, but the transmitter works! TX puts about 2 watts out (I know a bit low) but changing TX freq I can hear the signal on my big rig and freq. seems good. But when I transmit with my big rig I can NOT hear the signal at all on the QCX! When I try to peak BPF I get two bars, that is all C1 does nothing and I can BARELY hear the 700 Hz tone.

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Only mistake during assembly was wrong resistors in two spots, so I unsoldered and found that the little “circle” solder pad came loose on R19 and R26. I flowed enough solder around and I THINK the new resistors in R19 and R26 are connected to the trace.

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Any ideas? Almost ALL voltages on the ICs are off. Most pins are HIGH by about 1 V, but some are low. I measured them but will not post unless someone can figure out what they mean.

Maybe T/R stuck in transmit?

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Paul K3STX

BINGO!! Bad trace from R19 to R20. Soldered in a jumper and BINGO!! Hears well. Can peak the BPF, but not minimum on the other “alignment” settings yet. But one thing at a time.

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Thanks for your help. I should NEVER had made that mistake. I was looking at the wrong picture for the resistors. Had to cover up the parts of the page I was not interested in to avoid putting in “right” parts in “wrong” holes.

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paul

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In my experience, once these solder pads come loose they are gone and you cannot trust the connection. I suggest checking the continuity (resistance) from the component upstream to downstream of those resistors. I suspect you will have to install new resistors without the through-hole pads, joining the upstream and downstream components.

Steve N9SZ