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Another thought which might be relevant. I was struck by the relationship
with telephone lines. A few years ago I had a box installed by the "telephone
company who used to be a post office" that created 2 telephone lines out of
one (they still made me pay for two) and which I eventually realised was a major
noise source on 80 metres. It had a boolean logic which went something like: No
lines in use = No Noise, No.1 line in use = noise burst approx every 2 secs, No2
line in use = noise burst approx every 2 secs, Nos. 1 & 2 lines in use
= slow (5 - 10 wpm) random morse (or something similar). It went away when I
eventually complained and they came and dug a hole and did the job properly so I
could have ISDN. So I wonder if the LDO noise has a similar provenance
Pat G4GVW
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