[Elecraft] KXPA Power Output

[Ron D'Eau Claire]

Sure. If I were buying a supply today I'd get a 35A. But the 20A was in hand
and so I used it and I was just sharing my experience with it. 

73 Ron AC7AC

-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Kevin
Stover
Sent: Sunday, April 17, 2016 5:08 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] KXPA Power Output

I see your points. I'm just a little more conservative (paranoid) than
others.
I like a little headroom. I've got a pair of RS-35M's that are 24 and 20
years old. I can't kill em.

On 4/17/2016 6:47 PM, Ron D'Eau Claire wrote:
> A quality 20A peak supply is fine. For over a decade I've run a K3 and
then a K3S and, when those aren't on a KX3/KXPA100 off of an Astron 20
without an issue as long as the finals see a decent SWR (current demand
skyrockets as the SWR goes up). At low SWR's none of the rigs exceeds 18 to
19 amps, max.
>
> The 20 means 20A peak current - ICS rated (5 min on 5 min off). That
Astron is rated at 16A continuous but Amateur stuff is almost never
"continuous".
>
> Consider that 20A at 13.8VDC is 276 watts. As long as the rig is not way
below 40% overall efficiency there will be no problem.
>
> That's using a quality linear supply. I'm not so casual about a switcher
or a cheaper supply.
>
> I use the Elecraft supplied power cables on everything.
>
> 73, Ron  AC7AC
>
> -----Original Message-----
> From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of 
> Kevin Stover
> Sent: Sunday, April 17, 2016 4:19 PM
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] KXPA Power Output
>
> WRU nailed it. I missed it in the original posting.
> You're losing 1.7 volts in 8ft of that "#14 wire". That's about as bad as
it gets.
> Why didn't you use the power cable supplied with the amp? I believe it's
#12.
> What kind of power supply is running the amp? It has to be 25 amps peak
*minimum*, I'd say continuous. What else is being run on the same power
supply?
>
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--
R. Kevin Stover
AC0H
ARRL
FISTS #11993
SKCC #215
NAQCC #3441


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