It sounds (to me) like typical power line noise.
If it stops when wet (during/after rain, or when dew in the morning),
it probably is power line noise.
It would be interesting to hear with in AM mode with no noise-blanking.
Hunting it with small directional antenna on 2m or 70cm (mode AM or SSB)
is usually best way to track it. I am fighting the same tiring battle --
might find helpful comments on my site
You call also listen & see my power line noise recordings there, and compare
with yours, if you wish.
----- Original Message -----
From: "Yuri Onipko" <firstname.lastname@example.org>
Sent: Tuesday, July 24, 2007 08:02
Subject: [RFI] Noise
> For quite some time I hear noise that bothers me big time.
> You may listen to it at http://www.rigexpert.net/noise1.wav
> The recordings was done on 18 MHz using FT1000D in USB mode with 2.0 kHz
> filter ON. Almost S 9 on the meter...
> I hear it on all bands, with peaks on 7, 10, 14 and 18 MHz, but this is
> probably because of better antennas for these bands. Usually it stays all
> night and disappears some time in the morning, AFTER I go to work. But
> sometimes it stays ALL DAY and disappears in the evening. I'd say I don't
> have precise pattern for it.
> The noise is definitely coming from the direction of my neighbour's house
> far as I can determine by turning my TH6 beam, however, there is a street
> with street lights in that direction too. The noise stays ON even when the
> street lights are OFF, but sometimes (very seldom) there is no noise when
> the lights are ON...
> Any idea what could it be? Would appreciate any lead or INFO.
> 73 Yuri VE3DZ
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