Check the transceiver. The KPA has constant gain, and nothing that allows it to change power as you describe. If you use a K3, then reconsider your choice to use ALC. It is not recommended, nor is it needed with the KPA500. You also might consider recalibrating the transceiver to eliminate that as a culprit in this situation.
If the problem persists, contact customer support. 73, Jack B, W6FB Sent from my iPad > On Apr 27, 2014, at 4:04 PM, "Dr. William J. Schmidt, II" > <[email protected]> wrote: > > Well I have something odd going on. I was trying some new antenna tunings > today and noticed that the power out on the KPA500 would start at about 100 > watts.ramp up to 500+ watts over about 10 seconds, and then drop back to 100 > watts again. It kept repeating this cycle as I was talking to someone on > SSB. The SWR was perfect to the antenna the whole time (external > measurement). It almost looked like the ALC was oscillating at a very slow > rate (10 seconds or more). I have not dug into this yet but wonder if > anyone else has seen this? Checked all the coax connectors already. > > > > > > Dr. William J. Schmidt - K9HZ / J68HZ/ 8P6HK/ ZF2HZ/ PJ4HZ > > Owner - Operator > > Big Signal Ranch > > Staunton, Illinois > > email: <mailto:[email protected]> [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] ______________________________________________________________ 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]
