[RFI] 40 M QRN
thorntonash at comcast.net
Wed Feb 11 15:29:40 EST 2009
I have been watching the various discussions, but not sure I have
seen the situation I an experiencing.
I notice a very wide band QRN situation which is very noticeable on
CW with a 500Hz filter, usually S 3 spanning up and down the
spectrum. It often rises to S 5 or S 7 for short periods. On AM it is
a very fast buzzing noise. I use a 4 Square and usually it is from
the south, but not always. On a horizontal it is also there and same
It also shows up on 80 M, but the noise is higher there and I do not
operate as much 80 CW.
After dealing with this for several years it makes me think it could
be a TV as the times could mirror watch TV at breakfast and the even
and more so on the weekends. Certainly could be something else. I
have had not luck trying to pin it down with an Icom HF handheld,
does not register on the Icom.
The noise blanker does not affect this QRN. Taking out a preamp helps
Not sure it is the same noise, but at times it appears to roll down
the band, at least by tracking it on the S meter. Sometime sthe noise
sounds like a carrier on AM, could be a different source.
I am looking for ideas given walking around with the small HF
receiver does not show anything?
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