And, a note, most of the manufacturer branded power supplies are and were, 
astron.
----- Original Message ----- 
From: "Pat Byrne" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Saturday, May 25, 2013 5:48 PM
Subject: Re: power supplies(pros, and cons)


> David,
> you'll get a lot more on this subject before you're done and it will
> all be good info.  The linear supply has been around forever; for a
> given amount of power it is pretty heavy, sometimes hums a bit and is
> very reliable.  Astron is the name that comes to mind, although all
> of the transceiver manufacturers have their brand name on linear and
> switching supplies as well.  I'm sure that I have a Kenwood and an
> Icom linear supply down in the shack as well as a couple of 35 amp 
> Astrons.
> Switching supplies are newer technology and seem to have improved
> over the years.  There were horror stories of their losing their
> regulation and frying the equipment that they were powering but you
> never hear those stories any more.  I have an Icom switcher that will
> run their 100 watt gear and a couple of others that all work well and
> very quietly.  So R F noise has been no problem for me.  The
> switchers are physically very lightweight and I think a person could
> safely go that route these days.
> I'm sure that there is a lot more technical info on its way.
> Hope this helps.
> Pat Byrne, K9JAUAt 03:59 PM 5/25/2013, you wrote:
>>Hello List:
>>
>>Apart from the fact that they're 2 basic types of power supplies(linear, =
>>and "switching), I know very little about their relative =
>>merits/shortcomings except that the latter type seem to be much less =
>>expensive, smaller, but perhaps at the price of a little more noise.  It =
>>seems that many people on this list use an Astron supply providing from =
>>25-30 amps.
>>
>>I could use a primmer/tutorial on supplies, and the practical reasons =
>>for  preferring one type over the other.
>>
>>73,
>>
>>
>>
>>David S. Pearson-wa4dsp