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Re: [RFI] Thumper & not the rabbit

To: rfi@contesting.com
Subject: Re: [RFI] Thumper & not the rabbit
From: "Gary Smith" <Gary@ka1j.com>
Reply-to: Gary@ka1j.com
Date: Sun, 30 Mar 2014 03:16:22 -0400
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
Some interesting thoughts. It's for sure RFI that's involved and I am 
ordering a fairly large quantity of ferrite clamps which I plan to 
attach to each coax termination & origin in my system. I'll have some 
left over to try and resolve things like this. 

The most mysterious part to me is how it is a thumping sound just 
like a large sheet is energized in a kinetic nature and vibrating 
against resistance creating a drum like sound using the enclosure as 
the drum head. Very unexpected. The leads to the unit are pretty 
tight and I think it would be a good idea to make loops of matching 
zip cord through the ferrite snap-ons and solder them in series to 
the existing control wires.

This will be a good first step and then mention was made about the 
unit being properly grounded. I haven't looked at that as it was 
installed by a local heating company and I will have to be sure they 
did that.

The tribander is at arm level on the top of the roof of this 1 story 
ranch and if it were higher, there would surely be less rfi to 
contend with. Can't do higher at this time but I've been considering 
hardline, I wonder if this would be of more benefit to reduce the 
RFI? issues or if its the RFI getting into the equipment from wiring? 
Still, there was a very marked improvement in thumping with that new 
balun in line.

Thank you for the attempts to help.

73,

Gary
KA1J

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