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Re: [TenTec] Power Supplies

To: <tentec@contesting.com>
Subject: Re: [TenTec] Power Supplies
From: "Tommy" <aldermant@alltel.net>
Reply-to: tentec@contesting.com
Date: Wed, 3 Nov 2004 18:50:53 -0500
List-post: <mailto:tentec@contesting.com>
AMEN...on switching power supplies...you WILL find RFI noise
somewhere if you know what your listening for

I run an Astron 70 amp linear supply, which has an external fan.
However the fan has never kicked on in the past two years running
either the Orion or the Omni 6+. No hum, no cabinet noises, just

Tom - W4BQF

----- Original Message -----
From: <al_lorona@agilent.com>
To: <tentec@contesting.com>
Sent: Wednesday, November 03, 2004 5:08 PM
Subject: RE: [TenTec] Power Supplies

> I have used an Astron RS35M for 30 yrs. and it
> is noise free, I own several other Astrons and
> none of them make any noise when running.
> Gene Hawkins

And Gene, not only  is your Astron quiet, but it is also RF quiet,
too. No matter what anybody says, all switching mode power supplies
put out RF noise. Some guys don't know what it sounds like, so they
will deny that any noise is generated by their units. But give me a
receiver and I will find the noise every time. It may be weak, but
it's there. And certain antenna configurations make the problem
worse. This is why I have never liked switching mode power supplies.
Sure, they're light. But they are also sources of RFI and I don't
allow them near my shack.

It is difficult enough to deal with the many, many SMPS in
electronic devices all over this neighborhood, most of which are
many times worse than the ones many hams use.

Gene, a big, linear power supply is awesome. Hang on to that unit.


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