[Elecraft] K3 and KX3 questions for Wayne

[Ron D'Eau Claire]

Actually it is a good measurement when the KXPA100 and KX3 are set up
'normally' with power to the KX3 supplied via the KXPA100.

What the KX3 will display is the voltage present at the input to the KXPA100
(because that's where the KX3 is getting its power) less any voltage drop in
the cable from the KXPA100 to the KX3.

So if the voltage reads good at the KX3 with that setup, it's good at the
KXPA100. 

73, Ron AC7AC 

-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Ken G
Kopp
Sent: Sunday, May 22, 2016 10:53 AM
To: Nr4c; elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3 and KX3 questions for Wayne

Bill,

The front panel voltage display on a KX3 will -not- be accurate for the
voltage at the input- power connector of the KXPA100.
This voltage must be measured AT THE CONNECTOR on the rear of the KXPA100 to
know what's being delivered to the PA.

73!

K0PP

On Sun, May 22, 2016 at 9:40 AM, Nr4c <nr4c at widomaker.com> wrote:

> Or just use the Voltage reading displayed on the K3/KX3 front panel. 
> It's quite accurate.
>
> Sent from my iPhone
> ...nr4c. bill
>
>
> > On May 22, 2016, at 10:52 AM, David Orman <ormandj at corenode.com> wrote:
> >
> > Another question - how long/what gauge is the wire running to your
> KXPA100?
> > I wouldn't expect enough drop to pull your voltage down to a point 
> > at
> which
> > it cuts back power, but you never know. Check your KX3 for the 
> > source voltage when transmitting, that'll tell you if you're 
> > dropping below the threshold for power reduction. For example, 16 
> > gauge copper will drop
> about
> > 1.2 volts on a 10 foot run @ 15A current draw.
> >
> >> On Sat, May 21, 2016 at 9:58 PM, N6MQL <n6mql at arrl.net> wrote:
> >>
> >> Wayne,
> >>
> >> 2 things... First I mentioned to David S in the service department 
> >> that the K3 is no longer transmitting more than 94 watts out on 17 
> >> meters regardless of the SWR/ impedance. David said that this was a 
> >> known issue due to software and that it was being worked on. 
> >> However I haven't seen anything about this issue so I'm wondering 
> >> if this is true and if so has there been any updates to fix it.
> >> Secondly, I'm noticing that my KXPA100 can not produce more that 80
> watts
> >> on most bands and 60 on others when I don't supply it with as much 
> >> as
> 15v
> >> DC on a 30 amp supply. This after I did the KX3 / KPXA calibration 
> >> procedure. Why is it that a "mobile" amp that would normally be 
> >> powered with 12v DC from a car battery not be able to provide the 
> >> power output
> that
> >> it is sold as (100 watts)?. Has there been some kind of revisions 
> >> to the first run boards that I should be exchanging them with?
> >>
> >> Thank you for your answers  73
> >>
> >> Mike
> >> N6MQL
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