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

[Raymond]

If it’s a regulated power supply with crowbar And the radio has a fuse why are you using inline fuses?

Sent from my iPhone

> On Apr 25, 2020, at 10:04, Chuck Chandler <chandlerusm at gmail.com> wrote:
> 
> 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
> 
> -- 
> 
> 
> ===================
> Chuck Chandler
> chandlerusm at gmail.com
> ===================
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