[Elecraft] ASTRON RS-35 or SS-30 supply - OK for K2/100?

Thu Dec 19 17:59:07 2002

It is interesting that you feel that your RS-35M is "dead quite".  I
have owned two Astron supplies over the years and they both made an
objectionable audible hum with or without a load.  The first one I had
was rather small 10-12 amps and I don't recall the model number but
the second one was an RS-35.  I ended up replacing it with an Alinco
DM-340MV which I feel is "dead quite".

John
K7SVV
[email protected]
K1 #1378, K2 #2569, SST 20, Rock Mite 20, Rock Mite 40, Nor'Easter

----- Original Message -----
From: "John J. McDonough" <[email protected]>
To: "'Elecraft'" <[email protected]>
Cc: "Wallace, Andy" <[email protected]>
Sent: Thursday, December 19, 2002 2:18 PM
Subject: Re: [Elecraft] ASTRON RS-35 or SS-30 supply - OK for K2/100?

> Consider going even larger.
>
> I bought an RS-35M about 5 years ago now.  It is a wonderful supply,
and
> being an old fogey, I am comforted by the huge transformers.  It has
been a
> beautiful thing, and it runs a bunch of rigs for me without breaking
a
> sweat.  And, of course, it's absolutely dead quiet.
>
> BUT, every now and again I get the idea I'd like to try HSMS or some
other
> mode that needs a bit of power, and 25 amps isn't enough to cover
the rig
> plus some respectable amp.  The price differential to go to a larger
supply
> isn't all that great, but to get another supply doubles the price.
>
> On the flip side, the RS-35 is amazingly heavy.  It could be a bit
of a
> problem just dragging something like an RS-70 into the house.
>
> ..
>
> ----- Original Message -----
> From: "Wallace, Andy" <[email protected]>
> To: "'Elecraft'" <[email protected]>
> Sent: Thursday, December 19, 2002 4:00 PM
> Subject: [Elecraft] ASTRON RS-35 or SS-30 supply - OK for K2/100?
>
>
> > For a future K2/100 purchase, I want to get a good supply
> > which can handle the draw of the rig, and not make hash on
> > the receiver - my antenna is awful and I will pick up noise
> > near the rig with it.
> >
> > The KPA100 manual says I will probably need 15-20A.
> >
> > The RS-20 only does 16A continuous, 20A intermittent.
> > The RS-35 does 25/35 which is probably more suitable.
> >
> > http://www.astroncorp.com/linear.shtml
> >
> > I'd like to hear from someone with an RS-35A or -35M (meters)
> > and how they like it with their K2/100. Ham Radio Outlet
> > has them. I definitely want something with overvoltage
> > protection and current limiting, and the RS-35 fits the bill.
> > Whether or not I need meters, I dunno...would be handy to
> > see what is happening if something is acting strange, but
> > given the sensitivity to magnetic fields, I'll probably have
> > to have this linear supply a fair way away from the rig.
> >
> > The switching supplies are tempting. There's been lots of
discussion
> > and the ARRL review of the SS-30M switching supply:
> > http://www.arrl.org/members-only/prodrev/bymfg.html#A
> > gave it good marks. This also has overvoltage and current
limiting,
> > and handles 25/30A.
> >
> > Anyway, if someone has either of these two with their K2/100
> > I'd like to hear about receive hash with them -- using a feedline
> > or antenna which may pick up supply noise close to the rig.
> > I have a randomwire fed with coax (for appearance) and the
> > shield is doing darn little good.
> >
> > :-)
> >
> > -Andy
> >
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