Re: [TenTec] Fw: Your semi-annual Astron tip...

["Richard Detweiler" <rdetweil@hotmail.com>]

Hi Rick,

How's things in Deuchland?

The 963 does not have a floating ground,  It is pretty well done.

The 963 is the same basic circuit as the Astron ss30 switcher....

On a side note,  I've tamed the fan noise on the 963 by adding a 89 ohm 2 
watt resistor accross the heat sensor for the fan ( the heat sink closest to 
the DC terminals ) ,  it activates the fan all the time at low speed which 
makes it pretty quiet.  The fan hardly ever goes to full speed unless I'm in 
a long winded RTTY QSO at full power.   Really cuts the fan noise down.
This will work on the Astron Switcher as well.   Any resistor value from 75 
ohms to 100 ohms will do.
Best wishes,
Rich
K5SF



> From: "NJ0IP" <Rick@DJ0IP.de>
> Reply-To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
> To: "'Discussion of Ten-Tec Equipment'" <tentec@contesting.com>
> Subject: Re: [TenTec] Fw: Your semi-annual Astron tip...
> Date: Tue, 29 Nov 2005 07:19:29 -0800
>
> Mike, do you know if the 963 has floating ground?
> Of course I could measure it, but this is the easiest way to find out.
>
> 73
> Rick
>
> -----Original Message-----
> From: tentec-bounces@contesting.com [mailto:tentec-bounces@contesting.com]
> On Behalf Of Mike Hyder -N4NT-
> Sent: Tuesday, November 29, 2005 6:07 AM
> To: Ten-Tec Reflector
> Subject: [TenTec] Fw: Your semi-annual Astron tip...
>
> 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.
>
> Happy November,
> 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
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