[Elecraft] Power Supplies for K3

[Dave Hachadorian]

It was interesting to re-read the ARRL reviews of some of the 
switching supplies:
http://www.arrl.org/files/file/protected/Group/Members/ProductReview/pdf/pr0001.pdf

The switchers were fairly RF-quiet at low current draw, and then 
created more noise as they drew more current.  This is fine for 
the usual single-transmitter ham station, but could be an issue 
in so2r or multiop.

I use a single Astron RS-35A analog supply for so2r with two 
K3's.  It works great, and it is a fail-safe way to ensure that 
both K3's can not transmit at the same time. The supply will 
simply groan and give up!

Astron linear supplies also have a simple (internal) voltage 
adjustment, so you can pump the voltage up to 14.5 for reduced 
IMD.

Dave Hachadorian, K6LL
Yuma, Arizona











































.