[TenTec] humm

[Mike Hyder --N4NT--]

This is NOT a diagnosis but a possible avenue of investigation.  The early
Astron RS35 had a problem with internal grounding (actually the lack of it).
If your Astron is old, it may help to follow Astron's suggestion.  Here is 
my
correspondence with them:

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 at contesting.com>
      Subject:  [TenTec] Astron Power Supply (RS-35) from the horse's mouth
      From:  "Mike Hyder -N4NT-" <Mike_N4NT at charter.net>
      Reply-to:  Discussion of Ten-Tec Equipment <tentec at contesting.com>
      Date:  Tue, 5 Dec 2006 21:04:25 -0500
      List-post:  <mailto:tentec at 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 at astroncorp.com>
To: "Mike Hyder" <N4NT at 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 at chartertn.net
To: <eastron at 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 at gmail.com>
To: <tentec at 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.
__________________________________________________________
__________________________________________________________

----- Original Message ----- 
From: "John Molenda" <brazos at rochester.rr.com>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Tuesday, November 24, 2009 07:14 PM
Subject: [TenTec] humm


> Hello all , I am getting a hum on my audio when I go to the SSB menu and 
> turn my l.f. rolloff  below 200 Hz  at 200 and above the hum is gone . 
> I am using the Orion II with a Heil heritage mic and the mic with the 5 
> cartridge ( full range ragchew ) If I change nothing and use the 4 
> cartridge ( dx dream ) I get no hum .  ( I know if it hurts when you do 
> that don't do that )  Oh by the way I am using a astron rs 35m power 
> supply .  any Ideas ?  thanks John kb2huk