[Elecraft] Which PS for K2/100, linear or switcher?

[Vic Rosenthal [TSI]]

Ron D'Eau Claire wrote:

> Hmmm... Did you increase the 20 amp fast-blow fuse size Elecraft specifies,
> Vic? 

I'm using a Rigrunner power strip and I have a 25 amp fuse in the K2's slot.

> If you are really drawing 20 amps (or more), that suggests some issues with
> your output bandpass filters.

I don't recall which band or bands drew 20 amps, but I don't think 
there's a problem.  I recall discussing this with Gary at the time and 
we decided that 'some of them do this'.  I will check it the next time 
I'm in my shack and see which bands.

One other thing to keep in mind is that a slightly reactive load -- even 
with a reasonable SWR -- may change the current draw significantly.  I 
think this was my issue, actually.  Some band on which the antenna's SWR 
was about 1.4:1 nevertheless drew much more current than the dummy load.

> Yes, the K2/100 is a bit more efficient than many rigs. I suspect that's why
> a lot of ops got the idea that the 20 amp Astron was too 'light' for it! 

I think the 20 amp Astron would be fine just to run a K2.  In my case I 
also have a 2-meter rig (which I used to use for packet and which would 
therefore randomly transmit at 45 watts) and a whole bunch of filters, 
etc., each of which is good for an amp or so.
-- 
Best Regards,
Vic Rosenthal
Transparent Software, Inc. -- RAKEFET
559.226.5147
Visit us at <http://www.rakefet.com>