[Elecraft] New 30A power supply on Elecraft order form

[Johnny Siu]

Hello David,
Pretty much the opposite, I am using an Alinco DM-330MVE.  It is quiet and I see nothing on the P3.
While there are merits of using linear power supply, in practice, many telecommunication equipment in both commercial and miltrary sectors are using switching power supplies.
Clearly, quiet switching PSU is fairly expensive but it does not mean any rocket science.
I have already given up linear power supply except the KPA500 is still using linear transformer.
73
Johnny VR2XMC

       寄件人︰ David Orman <ormandj at corenode.com>
 收件人︰ 
副本(CC)︰ Elecraft Reflector <elecraft at mailman.qth.net> 
 傳送日期︰ 2015年04月15日 (週三) 7:51 PM
 主題︰ Re: [Elecraft] New 30A power supply on Elecraft order form
   
Having the Alinco DM-330FX, and the PX3, one thing I want to make sure
people understand is do not expect a 'clean' panadapter display with one of
these Alinco PSUs. You can definitely shift the noise out of a SSB
transmission, for example, but you'll still see it on the display. It was
frustrating enough to me I picked up a linear PSU so spotting signals on
the PX3 wasn't as much of a challenge. Not sure how this other PSU compares
in this regard - but it's something to consider - perhaps someone with the
PSU Elecraft is selling can chime in regarding this.

On Wed, Apr 15, 2015 at 4:18 AM, Sverre Holm (LA3ZA) <LA3ZA at nrrl.no> wrote:

> I'm sure it is right that no switcher is 100% noise-free. But some of them
> have a means to change the switch frequency. That could be a way to help
> out, if the noise happens to fall on a particularly interesting frequency.
>
> I have two of them, one is an Alinco DM-330MV (32 Amps) and another is an
> unknown-brand Chinese one.  I have only had to use this feature on 160m. I
> have ladder line directly into the shack, so I may more sensitive to this
> kind of noise than if I had a coax feed.
>
>
> wayne burdick wrote
> > I'm not sure if a 100% noise-free 30-amp switcher has ever been designed.
> > If it has, chances are it would be far more expensive than this one. But
> > if you've found one, please let us know.