Hi Jonathan: You may well have joined "the group." But first...
Make sure that you can get at least 10 watts output on all bands with the KPA100 turned "Off" in the menu. Then you should recheck the power calibration procedure for the KPA100 unless you are very confident that it is correct. If both of those check out OK, then you are probably experiencing the same thing that several others (with you I think there are now 9) that are having pretty much the same problem. Elecraft and the designer are working on the problem and I'm sure there will be a solution soon. In the meantime, one of the things that has worked for some is to increase the capacitance at C80 and C81 between T1 and the bases of the PA transistor. Some have changed to 5600 pF, some have added another 4700 pF, and I ended up adding 2200 pF. One ham in England who had the problem replaced C80 and C81 with new 4700 pF caps from Elecraft and the problem remained. He then purchased locally and installed replacement new metal film resistors to replace R19 and R20 and new 4700 pF caps to replace C80 and C81 and the problem was completely resolved for him. It suggests that the provided resistors may have enough inductance to resonate with the 4700 pF cap and create a "trap" at around 10 MHz. I encourage you to report the problem to Gary <[EMAIL PROTECTED]> so that they are aware that there is another builder with this problem. 73, Ken K3IU -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Gottlieb, Jonathan Sent: Sunday, June 12, 2005 12:12 PM To: [email protected] Subject: [Elecraft] KPA100 Hi Current on 30M Almost finished with my KPA100. Power output is 100 watts on all bands except 30M where I get hi current display over 55 watts. Any suggestions? Jonathan Gottlieb WA3WDK _______________________________________________ Elecraft mailing list Post to: [email protected] 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
