There may be 2 issues with my 472kHz (630m) QRPP setup.
As mentioned in the last post, I suspect the IRF510 PA device is damaged. My transverter gives 12W into a 50 ohm load, but the measured ERP is less than 10mW. Despite this, I was able to get to Norway most nights last winter.
There may also be a break in my earth-electrode "antenna".
As a first step, I am on 472kHz WSPR RX overnight. If this works, it probably means the earth-electrode "antenna" is intact. If this is the case, I may be able get on TX again just by mending the PA device. If this fails, I shall replace both the IRF510 and the wire in the garden.
UPDATE 1830z: With F and DL already spotted, initial results are encouraging.
UPDATE 2130z: I think the earth-electrode "antenna" in the ground is fine, judging by results this evening. I shall leave the RX on overnight, although I have spotted far more than I expected.
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