Don, I am not at home right now to look at K2, but will try and answer your questions to provide additional information.
I am not sure what the K2 was displaying in terms of watts out (I think it was a low number), but I confirmed the output at 165w using two external wattmeters (first the Elecraft W1, which I did not totally believe because it was maxed out, then my Bird 43 with 1000w slug). I was connected to a Bird 125w dummy load, confirmed 50 ohm. The cable was probably not the best, it was a 20 ft run of RG-58 I think. My kit used the red toroids, and I assume at L15 and L16 but would have to check when I can look at the kit (when I get home). Also will have to check the value of C31. Don't know if this will help you or not . . but this is what I can provide for now. Will check the rest when I get home this evening. Thanks, Mike N4JX ----- Original Message ----- From: Don Wilhelm <[EMAIL PROTECTED]> Date: Monday, June 11, 2007 8:57 am Subject: Re: [Elecraft] Strange KPA100 behavior To: Mike Geddes <[EMAIL PROTECTED]> Cc: Elecraft <[email protected]> > Mike, > > Is the K2 displaying 165 watts? Or is the K2 displaying 0.2 watts > or > lower while an external wattmeter is displaying 165 watts? > What is your test setup that gives you a 7:1 SWR? If you are > feeding a > resistive 50 ohm dummy load with good coax, the wattmeter (either > internal or external) should read 1:1 even with a KPA100 problem. > > Tell us more so we can help with your problem - > Taking a very wild guess, you either have a non-functioning > wattmeter in > the KPA100, or the KPA100 wattmeter is not calibrated, or you have > a > parasitic oscillation in the KPA100. > > Since this is a new kit - do you have blue toroid cores at L16 and > RFC1 > or do you have red toroids at L15 and L16? And tell us what the > value > of C31 is and whether you determined the value by looking at the > capacitor (preferred) or whether you just looked at the parts > list/schematic. > > We need the answers to all these questions before we can advise > you further. > > 73, > Don W3FPR > > Mike Geddes wrote: > > Greetings. I recently finished my K2 KPA100 kit. It seemed to > work okay > > initially, then last night started to exhibit some strange > behavior. It > > would transmit correct power on tune under 11 watts (and show > low SWR), > > but on anything over 11 watts, on tune, it would transmit around > 165 > > watts and show an SWR of around 7:1!! And giving High Current > message > > Is there anything I should start looking for initially? > > > > Any suggestions are appreciated. > > > > Thanks, > > Mike > > N4JX > _______________________________________________ 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
