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Re: QMX Heated Up, now no output

 

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Tom,

Reheat T501. ?I had same problem. ?I don’t think that the QRP Labs scrapes any of the toroids wires and depends on the solder to dissolve the varnish. ?It took quite a while and higher soldering iron temperature until I was satisfied that the solder was adhering to the transformer wires. ?Everything is working fine now. ?It’s quite a fine rf tool at a reasonable price, even after paying them to build it.

Be the REASON someone smiles today.

Dave K8WPE

On Dec 26, 2024, at 7:20?AM, tom.rockhold via groups.io <tom.rockhold@...> wrote:

?
Using the same power supply (11.8v via BUC converter) and same antenna (Resonant 40m) that had been working for an hour, suddenly the unit quit putting out RF and when I put my hand on it it was very hot.
Disconnected power of course, and verified the SWR was still 1.3 on the 40m antenna.

This is an assembled unit from QRP-Labs.

I've done a reset via the menus, and let it cool overnight, no overheating now, but it's drawing slightly more current (0.12 increase to 0.24) at idle, and doesn't draw anything more at transmit.

I don't know where to start.
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