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 <[EMAIL PROTECTED]> wrote:
> Date: Sun, 27 May 2007 12:08:40 -0700 (PDT) > From: Curt Milton <[EMAIL PROTECTED]> > To: [email protected] > 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: [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
