[Elecraft] Ideal input voltage for TX on KXPA100?

[David Orman]

Hi Don,

Thank you for the reply. Is there an ideal voltage under TX/ load? 13.8V
under load is easy, so is 14.5+. If there's advantage to running higher
voltages, I can, but if there is no advantage I'll just target 13.8 under
load and call it a day and not worry about dropping voltage for other
components.

David

On Sun, May 14, 2017, 14:11 Don Wilhelm <donwilh at embarqmail.com> wrote:

> David,
>
> Turn it up until you see at least 13.8 on the KX3 when idle, then check
> the voltage during transmit.  You really  can go up to 14.5 volts with
> no harm.  If the voltage drops by more than 1 volt, you have too much
> resistance (too many connections) in the power cord run from the power
> supply.
> Connect the power cable to the KXPA100 directly to the power supply
> terminals.  With a 15 amp draw there will be a substantial voltage drop
> across a device like a Rigrunner.
>
> 73,
> Don W3FPR
>
> On 5/14/2017 2:43 PM, David Orman wrote:
> > Hi,
> >
> > In order to maximize TX quality and cleanliness from the KXPA100, what
> > should I aim for regarding input voltage on 100W keydown as seen by the
> KX3
> > display option PS? I've got an adjustable Astron VS-70M, but would like
> to
> > power other equipment, so am trying to find to sweet spot for the radio
>