This is funny. He already said that grounding the negative post to the
chassis cured his problems. . .
I rest my case.
73, Mike -N4NT-
----- Original Message -----
From: "Stuart Rohre" <rohre@arlut.utexas.edu>
To: <tentec@contesting.com>; "Dennis DiGalbo" <digalbo@erols.com>
Sent: Monday, November 12, 2001 3:18 PM
Subject: Re: [TenTec] RF problems with Astron PS
> A basic for RF in the power supply is put the supply on the floor, or
remote
> from antenna feeders of possible. You can also add RF cores to choke RF
> backfeeding into the two screw terminals of the Astron, just inside the
> supply. By pass both plus and minus bolts to chassis to with disc ceramic
> caps, say of 0.005 mf if you have a good 3 wire grounded AC system. Use
> twisted pair heavy leads between the Astron and rig, and even better
shield
> over the twisted pair, and ground that shield to station RF ground to
earth
> with short lead. If station is on upper floor, then you should use a
> balanced antenna, such as dipole or dipole fed beams, or use 1/4 wave from
> station ground point, as tuned counterpoise for the band having problem.
> Run the 33 foot insulated wire counterpoise around the baseboards of the
> shack, or out to yard, straight if possible.
>
> Make sure you do not have a ground loop in your station. The rig ground
> screw should only go to earth, and there should be a star ground system
from
> each accessory to that central grounding point. Again, upper floor
> installations need a counterpoise or artificial RF ground such as the Ten
> Tec kit RF counterpoise.
>
> The plus and minus leads of the Astron as wired from the factory should be
> floating, ie neither connects to Astron chassis. But chassis should
connect
> to 3rd pin of AC outlet. The minus lead will internally connect to the
rig
> ground AT THE RIG alone.
>
> GL and 73,
> Stuart K5KVH
>
>
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