Given that the poster is in the UK can probably assume 240Vac. Regards,
Mike VP8NO On 04/02/2012 17:31, Jack Berry wrote: > 120 or 240 volts supply? > > On Feb 4, 2012, at 2:27 PM, david park<contrast...@yahoo.com> wrote: > >> I have recently assembled KPA500 serial number 641. When testing into a >> dummy load I find that I get a large variation in the DC power input when >> driving for 500W CW when I go from band to band. My worst band is 21MHz, >> where I get the highest current (lowest efficiency). The drive was adjusted >> to give 500W as indicated by the LCD display. Here are my results:- >> >> 1.8MHz DC current 10.0A fan hardly ever comes on >> 3.5MHz DC current 10.0A fan hardly ever comes on >> 7MHz 12.0A >> 10.1MHz 12.4A >> 14MHz 14.3A >> 18.1MHz 13.8A >> 21MHz 16.4A temperature rises rapidly and fan >> soon gets to full speed >> 24.9MHz 13.5A >> 29.7MHz 12.3A >> >> I have no results for 50MHz band as I have no transceiver covering that band. >> >> The readings drift as the heatsink (and the dummy load) warm up, and so I >> took readings quickly and allowed time for the heatsink to cool down between >> each band. I find that the KPA500 current sensor tends to give low readings. >> I would be interested in knowing how other amplifiers perform. >> >> David Park G3PSV >> ______________________________________________________________ >> 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 > ______________________________________________________________ > 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 > ______________________________________________________________ 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
