[Elecraft] power supply

Fri Nov 1 14:58:02 2002

Hi

Unless it is very old the hp power supplies are not true linear supplies.=
 They have a SCR type pre-regulator and a linear regulator following.  I =
have a hp 6263 0-20 volt at 10 amps and it is like that. I don't use it o=
n radios so I'm not sure if its noisy or not. But it could have some swit=
ching noise. If you want a bullet proof linear supply try to find a big L=
ambda on the surplus market. Very few power supplies will supply their fu=
ll rated current at low output voltages without overheating most Lambda p=
ower supplies will do this all day long. That is why they are so big and =
heavy. Try to find one with discreet transistor regulators. Some of the n=
ewer IC type regulator chips are no longer made so it is very hard if not=
 impossible to repair them if you need a chip (unless you can get a spare=
 to cannibalize).

Don Brown
KD5NDB

----- Original Message -----
From: Mike McCoy
Sent: Friday, November 01, 2002 11:54 AM
To: Elecraft Reflector
Subject: Re: [Elecraft] power supply

Speaking of linears, a while back someone posted their recommendation for=
 a
'surplus' high current HP linear power supply. I can't find the post but =
I
sure would like to know the model number of that HP.

I'm thinking of getting one nice big fat linear and hooking it up to a
Rigrunner so I can completely convert all my gear (including the dinky
stuff) to Anderson powerpoles.

-Mike

----- Original Message -----
From: "Mike McCoy" <[email protected]>
To: "Elecraft Reflector" <[email protected]>
Sent: Friday, November 01, 2002 10:18 AM
Subject: Re: [Elecraft] power supply

>
> All my supplies are of the linear variety. What is it that makes switch=
ing
> supplies so attractive and/or preferable to a linear design?
>
> Wouldn't using a (decent) linear supply solve any/all concerns about ha=
sh?
>
> Mike - K5PU
>
> ----- Original Message -----
> From: "Kenneth E. Harker" <[email protected]>
> To: "Elecraft Reflector" <[email protected]>
> Sent: Friday, November 01, 2002 9:29 AM
> Subject: Re: [Elecraft] power supply
>
>
> > On Thu, Oct 31, 2002 at 10:46:53PM -0500, Jeff Burns wrote:
> > > I am comparing the MFJ 4125 power supply to the Samlex SEC-1223 and
the
> > > Astrom SS-25. Any helpful comments would be appreciated. This will =
be
> used
> > > to power a K2/100 eventually.
> >
> > There was a Product review article in QST in Jan 2000 that reviewed (=
I
> think
> > these very same models of) switching power supplies.  The Astron and =
MFJ
> > supplies performed well.  The Samlex supply did not.
> >
> > http://www.arrl.org/members-only/prodrev/pdf/pr0001.pdf
> >
> >
>
>
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