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 <rmcg...@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-requ...@mailman.qth.net wrote: > > Message: 15 > > Date: Sat, 5 Feb 2022 14:53:59 -0600 > > From: Ronnie Hull<w5...@comcast.net> > > To: Dick Dievendorff<d...@elecraft.com> > > Cc:Elecraft@mailman.qth.net > > Subject: Re: [Elecraft] KPA1500 wattmeter adjustment > > Message-ID:<bee49dcd-b7ea-4da5-89e6-35f933166...@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 > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to marklgoldb...@gmail.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
