Why not figure out exactly which panel of sheet metal is thumping, and then
either pull it tight by attaching a thin cable to it with a sheet metal screw
and tying it off to a wall, or pushing against it by wedging a 2x4 or something
against it?
Chris
KF7P
On Mar 30, 2014, at 1:16 , Gary Smith wrote:
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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