[Elecraft] K3 on Order

[Chris Hembree]

Very good Point..
What switching supply's are you using?
Thanks
Chris





________________________________
From: Tom W8JI <w8ji at w8ji.com>
To: Chris Hembree <w7cth at yahoo.com>; Larry 'Rebar' Rebarchik - N6CCH 
<rebar at hamilton.com>; n4zr at contesting.com
Cc: elecraft at mailman.qth.net
Sent: Fri, July 16, 2010 6:35:06 PM
Subject: Re: [Elecraft] K3 on Order

> My concern for any Switching supply is the RFI noice that the radio will pick 
>up
> from the power supply. Looking at the SEC 1235m, I was reading that it has a
> build in RFI filter. Plus I like the AD5X mod to slow down the fan. And the
> Alinco DM-340 MVT has a knob to change the freq. of the noise that the radio 
is
> picking up.

Any power supply that has a VFO knob built in means they either don't know how 
to get harmonics down to the proper level or don't want to spend a few bucks on 
components, so they took the cheap way out.

I have several switching supplies and can't hear any of them anywhere unless I 
run an antenna right in the room.