I have had pretty good luck by attaching ground radials
to my SPG panel where all the feedlines come in. This
seems to give the common-mode RF current coming
back down the feedline somwhere to go besides back
into my equipment. I have also used a common mode
choke between the SPG panel and the tuner, but it
wasn't as effective as the ground radials. YMMV
----- Original Message -----
From: "Rob Atkinson, K5UJ" <email@example.com>
Sent: Friday, November 07, 2003 10:45 AM
Subject: [TowerTalk] P.S.: Surge supression
> It seems to me that it will nevertheless still add an unwanted rf ground
> loop. It sounds like it might not be a problem provided you have common
> mode chokes in the feedlines between exciter and amp, and amp and
> (or if no transmatch, amp and feed to antenna), i.e. each item in the rf
> chain has a choke in the feedline between it and whatever's next.
> Rob Atkinson
> <<<This connection to the AC safety is there anyway unless you
> are using cheater plugs on all your AC cords. The chassis'
> of all your rigs and amps are connected to the third wire
> ground of your AC service. Those chassis' are in turn
> connected to your single point RF ground via the coax
> cables going through the SPG panel. Running an extra
> wire from the AC service ground to the RF SPG probably
> won't change much since you will just be putting a wire
> in parallel with multiple connections that are already there.
> The only way to get around this is to bring the AC service
> into the shack through the SPG.
> 73 de Mike, W4EF..................>>>
> ><<<The [surge supressor] in the station should be grounded to the single
> >point station ground
> >panel, as well as to the home safety ground.>>>
> ><<This sounds like a great way to turn your house wiring dc safety ground
> >into a giant antenna by transferring rf from the shack rf ground to the
> >wire on the house service lines.>>
> >p.s. It also sounds like a way to set up a nice ground loop in your
> >so RF can get into places you don't want it.
> >Rob Atkinson
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