Hi Poul-Erik, It sure sounds like a fault in the KPA500 power measuring circuit in your case, but is the output signal affected in any way? And does the SWR LED's fluctuate/flicker as well? I had that problem and it turned out to be a bad patch cable from the KPA500 to the KAT500. It would only happen above 100W or so, and on certain bands/frequencies.
73, Thomas M0TRN / OV5T On 20 June 2014 11:48, Poul Erik Karlshøj (PKA) <[email protected]> wrote: > For a while I have noticed that the KPA output indikations on both THE > LEDs and the LCD display is fluctuating. The highest LED is flickering and > the last two digits of the LCD are also fluctuating (hard to read, but at > 500W it varies about 10W I think). It is the same at any power level from > 20W to 500W. It is the same with the amp ON and STBY, so it seems to be a > problem in the power monitoring circuit. > > It is certain that the fault is in the KPA. I had another KPA connected to > the K3 and its power indication was steady - just like they were on my own > KPA until a few months ago. It is the same whether the amp is connected to > a dummy load or an antenna and I dont hear anything unusual listening on a > monitoring K2. > > I did not yet have an opportunity to look at the power envelope on an > instrument. So I dont know if the flickering is random like noise or not. > > I thought that may be someone else on this list has seen this fault and > might explain what's wrong. > > /Poul-Erik > OZ4UN > > Sendt fra min iPad > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
