Once upon a time some Astron power supplies had a floating output, neither
positive nor negative was connected to the chassis. For laboratory work,
this was just fine. But with radio transmitters, problems sometimes arose
because RF energy could enter through the negative post and go directly to
the voltage regulator circuitry.
Astron became aware of this and suggested grounding the negative post to the
chassis. I did it by taking the post out, removing the insulators, cleaning
paint from around the hold and reinstalling the post with no insulation.
Many reported they had never had a problem with their Astrons but I did and
apparently it was common. Below is my correspondence with Astron:
To: "Ten-Tec Reflector" <tentec@contesting.com>
Subject: [TenTec] Astron Power Supply (RS-35) from the horse's mouth
From: "Mike Hyder -N4NT-" <Mike_N4NT@charter.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Tue, 5 Dec 2006 21:04:25 -0500
List-post: <mailto:tentec@contesting.com>
[TenTec] Your semi-annual Astron tip...
People come and go from this reflector. This is a reminder that many
troubles with Astron power supplies can be cured by grounding the negative
post to the cabinet. I did it by removing the insulators from the negative
post, scraping some paint from around the hole and putting a lockwasher on
the post when reinstalling. Below is my correspondence with them about it.
Merry Christmas,
Mike -N4NT-
----- Original Message -----
From: "ASTRON" <sales@astroncorp.com>
To: "Mike Hyder" <N4NT@chartertn.net>
Sent: Tuesday, November 20, 2001 6:06 PM
Subject: Re: RS-35 in an RF environment
MIKE.
1ST CHECK YOUR AC OUTLET GROUND IT MUST HAVE GOOD CONNECTION
2ND. MEASURE FROM THE -13.8V TERMINAL TO CHASSIS, IF NO DIRECT CONNECTION,
RUN A PIECE OF WIRE FROM -13.8V TERMINAL TO CHASSIS.
JANE
----- Original Message -----
From: Mike Hyder <N4NT@chartertn.net
To: <eastron@astroncorp.com
Sent: Tuesday, November 13, 2001 7:56 AM
Subject: RS-35 in an RF environment
Several people have advised me that Astron had a service bulletin for the
Astron RS-35 (and possibly other models) which advised to strap the negative
post of the supply to the cabinet to reduce or eliminate problems caused
when RF energy affects the supply's regulation. This is in particular a
frequent problem in the amateur radio service.
Could you confirm such bulletin and either email it to me or point me to the
URL that will allow me to view it, please?
Many thanks,
Mike Hyder
----- Original Message -----
From: "Paul DeWitte" <kb9lie@gmail.com>
To: <tentec@contesting.com>
Sent: Wednesday, December 03, 2008 9:13 AM
Subject: [TenTec] Corsair II thump
>I did a bit of playing with the sidetone adjustments. That did nothing to
> help.
>
> I have been using an Astron SS30M power supply with a breaker in line. I
> tried a 962 TT supply and the noise is less.
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