Curt: I bet you are using the KPA100 with a KAT100 and using the tune button on the front panel of the K2. When the KPA100 is connected the output power of the KPA100 is limited to 20 watts. Try plugging a key into the key jack and set it for Hand Key mode and press the key. I bet you will see the amount of power out that you have set with the power control on the front panel of the K2. If this is the case I fought the same thing for a day before I realized that the K2 firmware limits the power out to 20 watts in the tune mode when a KAT100 is connected.
-------------- Original message -------------- From: Curt Milton <[EMAIL PROTECTED]> > I did some additional troubleshooting, but maybe there > is nothing unusual in these bias measurements? > > Bias Rx Tx > D11 13.7 0.7 > D12 0.7 129 > D13 13.7 0.2 > D14 0.7 129 > Q1/2 base 0 0.6 > > Still puzzled as why rig is limited to around 20w > output. Current draw is proportional to RF power > output, as above 20w setting rig will neither draw > additional current nor output additional power. > > --- Curt Milton wrote: > > > Has anyone experienced this problem, or know if I > > should troubleshoot the bias, input, or output > > circuitry. All is well with the low power bypass > > path, and rig seems to work up to around 25 watts > > output. > > --- Curt Milton wrote: > > > > > Date: Sun, 27 May 2007 12:08:40 -0700 (PDT) > > > From: Curt Milton > > > To: elecraft@mailman.qth.net > > > Subject: [Elecraft] KPA100 Failing to Produce High > > > Power > > > > > > All has been well up until now, including setting > > > the > > > bias per instructions. Without PA's my bias > > current > > > was 330 mA, so I successfully set it for 730 mA > > with > > > the PA's. > > > > > > I had adjusted R26 for 5w and got the VSWR sensor > > > zeroed. During my high power test (into a matched > > > antenna on a clear channel into a good antenna) my > > > VSWR is reading 1.2 on the K2 and similar on my > > > external meter. When I transmit the PA devices do > > > get > > > very hot (too hot to touch after about 10 seconds) > > > but > > > they quickly cool (maybe around 5 seconds or less) > > > after transmit ceases. > > > > > > Here is the behavior i am getting. First column > > is > > > K2 > > > power setting (on 20m), second is what the K2 > > reads > > > on > > > transmit, and third is my meter. My meter is not > > > state of the art but it is reasonable with my > > other > > > rig. > > > > > > K2 Setting K2 Indicated Meter > > > > > > 15 15 20 > > > 20 20 28 > > > 25 25 30 > > > 30 23 28 > > > 35 22 30 > > > 40 22 35 > > > 50 23 32 > > > > > > Thinking that maybe R26 was way off, i set the K2 > > > for > > > 40 watts and tried to adjust R26 to read 40 watts > > - > > > no > > > this got me no where. > > > > > > I tried to operate on different bands with two > > > different antennas. Same impact on all bands, > > > except > > > it has even lower output on 10m. > > > > > > Troubleshooting suggestions appreciated! > > > > > > 73, Curt > > > > > > > > > > > ________________________________________________________________________________ > > ____ > > Be a PS3 game guru. > > Get your game face on with the latest PS3 news and > > previews at Yahoo! Games. > > http://videogames.yahoo.com/platform?platform=120121 > > _______________________________________________ > > 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 > > > > > > > ________________________________________________________________________________ > > ____Ready for the edge of your seat? > Check out tonight's top picks on Yahoo! TV. > http://tv.yahoo.com/ > _______________________________________________ > 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 _______________________________________________ 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
