Indeed.
There are some truly awful PSK31 signals around.? One I saw yesterday, the actual PSK signal was mostly clean, and low(ish) IMD (-20dB or so) but there was a broad band of lower level carriers centred some 500 Hz lower than the PSK signal.? The sort of thing I've seen before, that turn out to be caused by some sort of TX speech compression in the radio being ON by mistake.
I watched for a while, and the LF crud was always exactly sync'd with the start and stop of the PSK signal.? I tried to look up the call used (a German Ham, sorry but that bit of paper is no more) but no hits on anything.? Think it may have been some sort of special event/activity call.
I couldn't contact him, as my antenna is very close to the fence one side of my property, while the neighbours on that side were having a bit of a garden party, noisy kids and all!? (Happy noises it has to be said..)? So due to the EMF rules, I cant stoke up HF to more than just a few Watts, and that didn't cut it with the German sadly.
There are also some (Russian I think) stations that have huge and high IMD signals.? Thankfully, they don't stick around long.
Regards to All.
Dave G0WBX.
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