[Elecraft] KPA1500 wattmeter adjustment

[tony.kaz at verizon.net]

Hi Mark,N8LP sent me a note concerning the calibration of the LP100 at high frequencies. I use the LP-100 as a reference. I just packed up the LP100, cables and head to ship to Larry tomorrow. I have had it for a long time. Who knows? I may have done something dumb with it. 3-5% is fine in my book.
73,N2TK, Tony


-----Original Message-----
From: Mark Goldberg <marklgoldberg at gmail.com>
To: Bob McGraw <rmcgraw at benlomand.net>
Cc: Elecraft Mailing List <elecraft at mailman.qth.net>
Sent: Sun, Feb 6, 2022 1:47 pm
Subject: Re: [Elecraft] KPA1500 wattmeter adjustment

The only way to really know for sure is to have a NIST traceable calibrated
wattmeter and have it calibrated on a regular basis. Hams are generally too
cheap to do that. The LP100 does come calibrated, so that would be my go to
reference, but I'll bet Hams will hardly ever get the calibration checked
after purchase. I could not find how much they charge for that service.
Even that is only calibrated to 5% with 3% typical. So, if you off 5W while
measuring 100W, who knows, it might be just the calibration error.

73,

Mark
W7MLG

On Sun, Feb 6, 2022 at 10:11 AM Bob McGraw <rmcgraw at benlomand.net> wrote:

> 'Twas said "a man with one watch always knows the time.  A man with 3 or
> 4 watches is never quite sure of the time.".
>
> I just recently went through power calibrations on my K3S and my
> KPA500.  All now agree with the power meter reference I used. Also, this
> was done using a known 50.5 ohm dummy load.  On the antennas, even
> though SWR is indicated 1.1:1, there will be differences due to
> difference line complex impedance's.
>
> 73
>
> Bob, K4TAX
>
>
> On 2/6/2022 9:51 AM, elecraft-request at mailman.qth.net wrote:
> > Message: 15
> > Date: Sat, 5 Feb 2022 14:53:59 -0600
> > From: Ronnie Hull<w5sum at comcast.net>
> > To: Dick Dievendorff<dick at elecraft.com>
> > Cc:Elecraft at mailman.qth.net
> > Subject: Re: [Elecraft] KPA1500 wattmeter adjustment
> > Message-ID:<BEE49DCD-B7EA-4DA5-89E6-35F933166F77 at comcast.net>
> > Content-Type: text/plain; charset=utf-8
> >
> > Lucky your that close! My K3, P:, Lp100 and kpa1500 are all wayyyy
> different. I accept the LPA100 as being correct!
> >
> > Ron W5SUM
>
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