Don, Actually, in CalP mode on 10m the KAT2 reports 14.2W and my external shows 8.5W. I calibrated the KAT2 on 40m per the manual, should I set the FWD/REF pots on a different band? The closest setting of C55? in CALn was 006 as displayed on the K2's LCD. I did find that the test point voltage at pin 1 on U4 was about 2.5V @ 5W (3-4V spec). I did verify that everything was correct on and around T1.
The good news is after two months of troubleshooting, I finally have the radio working enough to make my first contact with it today. The other op. was in a bit of a hurry to QSY but, he did say that the audio sounded just fine (7.180MHz LSB with W8ERN). 73, Damon Don Wilhelm wrote: > > Damon, > > I would speculate that you have bad diodes in the KAT2 wattmeter (D1 and > D2), or there is some other problem with the wattmeter in the KAT2. > > Try this test: > 1) Put an external wattmeter (or other power measuring device) on the > output of the K2 and make certain you are connected to a good 50 ohm > dummy load. > 2) Set the power to 4 or 5 watts and set the KAT2 to CAL P and press > TUNE - check to be certain the K2 is controlling the power output near > the requested level. > 3) Evaluate the result: > > If the power goes to maximum output (but displays 0.1 or 0.2 watts - > which is actually zero), then you have a problem with the KAT2 wattmeter > circuit, and it it was working before, the most likely cause is that the > diodes have been zapped. > > OTOH, if the K2 display shows some reasonable power output, but is quite > different from the external wattmeter, you need to calibrate the KAT2 > wattmeter - start with the balance adjustment, then calibrate the power > output and finally calibrate the SWR. The adjustments must be done in > that order - if you go back to a prior adjustment, you have to re-do the > other adjustments. > > Fact is you may have only the forward diode bad but not the refl diode - > that would cause a higher than normal SWR to be indicated. Since the > diodes were likely damaged by a lightning static surge (yes, it can > happen even with an attic antenna), I would recommend replacing both of > them if either are suspected of causing a problem. > > 73, > Don W3FPR > > Damon - KC5CQW wrote: >> Below is some of the text that I sent to Gary. >> Basically, if I use the KAT2 to tune my 40m attic dipole the PA finals >> will >> short out. >> I haven't tryied to tune any other antennas because I don't want to pay >> for >> any more PA kits ($18.50 'ish each time I tune up). >> Also, CW is un-usable above 80m and no CW output on 10m (SSB and "tune" >> yield 8.5W) >> >> See text below... >> >> 73, Damon KC5CQW >> >> > _______________________________________________ > 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 > > ----- Damon Wascom KC5CQW Elecraft K2 #:6351 Build: 12/28/07-01/01/08 -- View this message in context: http://www.nabble.com/K2-Transmitter-and-KAT2-failures-tp15883353p15884384.html Sent from the Elecraft mailing list archive at Nabble.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
