[Elecraft] Reliable DC Power Supply for K3/P3

[Hisashi T Fujinaka]

The only thing that bit me: Astron XX does not mean XX amps. I have an
Astron 25M and I was trying to figure out why my K2/100 would power off
on 15M at 100W when I finally figured out that that the Astron 25 is a
20 amp power supply and my K2 needed a bit more. It would even fold
back the voltage. After more debugging (and lots of bypass caps &
chokes and dummy loads and a brand new oscilloscope) and I found that RF
in the shack could be part of the problem but just swapping to an Astron
35M was my fix.

Unfortunately, the Astron puts out a lot of heat, and my shack happens
to be in a room that gets pretty warm even with the A/C on. So I changed
to a 25A switching power supply which unfortunately has a fan. Now the
tradeoff is heat vs. fan.

On Tue, 19 Nov 2013, Don Wilhelm wrote:

> Bob,
>
> The old reliable Astron 35 is a very good linear supply - I do not have the 
> metered version, and mine sits quietly on the floor under the desk, no need 
> to look at meters there.
>
> I also have an Astron SS30 which does a great job at the workbench. Again no 
> need for meters, and even though a switcher, I have not found any switching 
> noise created in the ham bands.
>
> As backups, I have an MFJ 25 amp switching supply and an Alinco 340M linear - 
> the advantages of those supplies is that the output voltage is front panel 
> adjustable.  No noticeable noise from the switcher and the current is more 
> than sufficient for the K3/100.
>
> If you have other accessories, you might want to look at a 35 amp supply, but 
> 20 or 25 amps is all that is needed for the K3.
>
> 73,
> Don W3FPR
>
> On 11/19/2013 9:35 AM, Robert Nobis wrote:
>> I m about ready to place an order for a K3 and P3, and wonder if there are
>> recommendations on a reliable DC power supply for the Elecraft 100-W
>> transceiver.
>> 
>> 73,
>> 
>> Bob  - N7RJN
>> 
>> 
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Elecraft at mailman.qth.net
>> 
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> 
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

-- 
Hisashi T Fujinaka - htodd at twofifty.com
BSEE(6/86) + BSChem(3/95) + BAEnglish(8/95) + MSCS(8/03) + $2.50 = latte