[Elecraft] K3 on Order

[WILLIS COOKE]

Chris, I have two JetStream switching supplies that I have used for four years.  
I have not been able to attribute any spurious receiver responses to the supply 
in either my TS-850 or my Elecraft K3.  I have a few continuous carriers that 
seem to be spurious on 10 meters and 6 meters, but they are very weak, less than 
S1 and I have never lost a contact that I blame these signals.  I read a lot of 
comments about the power supply generated artifacts, but I have not seen any 
that properly documented a serious problem with any commerically offered 
supply.  One of my JetStreams does have some fan noise that I can hear when my 
air conditioner is not running and my amplifier is turned off.  I would 
categorically say that there is a lot more worry about switching supplies than 
the actual problems warrent.  I am sure that there are many who will not be 
convinced, but I have worked over 200 countries per year for the last four years 
while using switching supplies and I have an Astron analog supply sitting on the 
shelf that I don't use as well as a Pyramid analog supply that needs repair in 
the closet.  

 Willis 'Cookie' Cooke 
K5EWJ 




________________________________
From: Chris Hembree <w7cth at yahoo.com>
To: Tom W8JI <w8ji at w8ji.com>; Larry 'Rebar' Rebarchik - N6CCH 
<rebar at hamilton.com>; n4zr at contesting.com
Cc: elecraft at mailman.qth.net
Sent: Fri, July 16, 2010 9:08:36 PM
Subject: Re: [Elecraft] K3 on Order

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. 


      
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