[RFI] Sudden RFI After Rain

[Tom Horton]

Hello...
 In my experience and what I have learned over the years about RFI and especially line noise is... if you hear it on the low bands and diminishes the higher you go in frequency the less noise you hear, it is probably not really close.
 In other words noise on 75/80 meters can come from a long distance (maybe miles) away whereas noise on 12/10 meters is most probably close.
 I used to have noise only on 10/15 and it turned out to be exactly a block away.
 It can be transmitter on the power lines from wayyyy off. That kind will drive the RF hunters crazy, since they don't really know which way to look.
 Good luck,
 Tom K5IID

--- On Tue, 7/26/11, jim feldman <mtnredhed at gmail.com> wrote:


From: jim feldman <mtnredhed at gmail.com>
Subject: Re: [RFI] Sudden RFI After Rain
To: rfi at contesting.com
Date: Tuesday, July 26, 2011, 3:08 PM


I'm surrounded on 3 sides by HV transmission lines within a mile of my house
(I wasn't a ham when we moved).  I definitely notice the first rains.  Just
like your RFI.  I've just assumed it's arc over until the insulators wash
off.  We also get very heavy dew drop, cars, grass completely soaked.  I
also hear it worse on those nights too.  I've had 10 over S9 noise floors on
75, s8-s9 on 40, and it gets better as you go up.  Almost nothing on 10.

I'll listen for wwv on 5 and 10 and decide if it's even worth keeping the
rig powered up.

jim
w6jmf
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