OK, I will now take back the content of my last post. Re-reading more carefully, since an autotuner is involved, a certain minimum power is reqired to begin tuning - and if the power is set too low, 'strange things will happen'. Set the power for 2 watts or greater - it should tune with no problem. After tuning the antenna, you can drop the power back if you wish to run QRPp.
OTOH, since you indicate that the same thing happens with a dummy load (hopefully with no tuner involved), you should still look at the KPA100 low pass filter - and possibly the LPF in the base K2. 73, Don W3FPR > -----Original Message----- > Yes help, > > If it ain't one thing, it's another. Having just fixed the AGC > problem in > my K2 (2631), enjoying the beautiful radio, weirdness has again struck. > > I get high SWR on 40 meters after I cut the output down, to raise > it again > for full output. When I back the power off to minimum, there's the high > reflected power indication, about 9 to one. When I run the power > back up, the SWR > again behaves. Souns like antenna glitches, no? > > The antenna is a big loop (240 feet) open at the top, fed with > 450 ohm open > wire line. I use an SGC 230, and the combination with my K2-100 > has been > perfect. When I back off the power, only on forty meters, the > SWR goes crazy. > Only on forty. All other bands tune thru the tuner just fine. > So, thinking > still it must be the antenna, I ran the K2 into a dummy load. > Same Thing > Happens !!!!!!!!! > > Is there a bad solder joint in the low pass filter on the K2?; > that lets it > operate at some power levels but shows high levels of spurious > transmitted > signal sometimes? > > I don't get it. Any ideas? > _______________________________________________ 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
