On Sat, 03 Nov 2007 17:52:26 -0700, Steve wrote:
I pulled an old Astron power supply out of mothballs today. It's a
13.8 volt / 20 amp supply (the RS-20A). I find that there's a
noticeable hum when I plug it in, and I also notice that a small
output voltage of one volt or so is measureable on it even when it's
turned off and unplugged.

Yet another well thought out topic selected for posting in the *Antenna*
newsgroup.

But, then, what else is to be expected:
Message-ID: . com

On Nov 4, 12:21 pm, Spam Trap wrote:
On Sat, 03 Nov 2007 17:52:26 -0700, Steve wrote:
I pulled an old Astron power supply out of mothballs today. It's a
13.8 volt / 20 amp supply (the RS-20A). I find that there's a
noticeable hum when I plug it in, and I also notice that a small
output voltage of one volt or so is measureable on it even when it's
turned off and unplugged.

Yet another well thought out topic selected for posting in the *Antenna*
newsgroup.

But, then, what else is to be expected:
Message-ID: . com

It received some thoughtful, helpful replies. So yes, I'd say it was
very well thought out and wisely selected for posting here.

Spam Trap wrote:
Yet another well thought out topic selected for posting in the *Antenna*
newsgroup.

Just follow the thread of logic - The power supply
converts AC to DC. The transmitter converts DC to
RF which is routed to the antenna. :-)
--
73, Cecil http://www.w5dxp.com