Thanks Don, That could be the problem - my Rev D manual says it .033uf. I'll check it out and see it that cures the problem.
Thanks again. Bob -----Original Message----- From: Don Wilhelm [mailto:[EMAIL PROTECTED] Sent: Monday, July 16, 2007 12:32 PM To: Solosko, Robert B (Bob) Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] K2/100, KAT100 strange tuning problem Bob, Since you do have early updated version of the KPA100 - there is one thing yet to check, and that is the value of C31. If it is not a .22 uf capacitor, it should be changed to the new value. Elecraft will supply one if you ask - the part number is E530295. The capacitor situation was not discovered until after the updated KPA100s began shipping. Under certain conditions the updated KPA100 will oscillate near 600 kHz with the lower value capacitor at C31. I know this is confusing - the older KPA100s had a 40 meter parasitic, likely caused by RFC10 while the newer version has this other oscillation problem if the bypass capacitor is not large enough. Similar outward behavior, but entirely different causes. BTW - the changes from 'D to E' were only to clean up the manual. There is only a loose link between the manual level and the hardware revision level. 73, Don W3FPR Solosko, Robert B (Bob) wrote: > Thanks Don... My KPA100 was ordered in December and is Rev D, so it's > the version with the 40m parasitic problem fixed (it doesn't have RFC > 10 on the antenna connector that the earlier versions did)- I wonder > if the change to Rev D didn't quite fix the problem. Rev. E came out > shortly after I built my KPA100, but I don't know what changed from D > to E. Are there other things that I should check? > _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com