[Elecraft] Power supply V drop - was poor CW on K3S

[Chuck Chandler]

Here's an update.

I replaced the power cable running from the powerstrip with a 3-foot length
with glass fuse holders in each leg.  I also adjusted the power supply to
14.50V at rest.  The K3S now shows 14.2V at rest.  At 100W TX the K3S shows
13.2V, so a 1 volt drop.  Way too much.

The power supply voltage measured at the terminals drops from 14.50 to
14.44 for full power TX.  This seems too much, I had read the drop should
be no more than 0.01V and this is 0.06V.

So, suspecting the in line fuse holders I made up another cable with dual
blade-fuse holders, which was worse.  TX voltage on the K3S display dropped
to 12.9V.

I'm suspecting my power supply is to blame - it's a TenTec 963, a
re-branded Astron SS-30.  Alternatively, I have another commercial power
cable with fuse holders I can cut down and try.

Many thanks for all the help both here on the reflector and the direct
emails from several fellows, and to Rich VE3KI for the on-air tests this
morning!

73 de Chuck, WS1L

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Chuck Chandler
chandlerusm at gmail.com
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