Thanks to Don Wilhem again ,and again !!! Youuhou !! I got this behavior when testing my DATA port on my K2 trying PSK31 and Pactor-2. The power output on 40m and 20m was way off between the two bands using the digital mode. BUT, with this mod, it solved all my problems !!!
First of all, I think this mod should apply to all of you doing or not digital mode with their K2. AND...... I really hope I will meet Don Wilhem face to face one time in my life to shake hands and telling him.... « Don, really thanks to you for all your contributions to this discussion group !!!! » BTW, I will be at Dayton this year, just in case... my first time. :-) 73 J-F VA2SS (formerly VA2VYZ) The conditions you describe are almost identical to the behavior experienced when the KI6WX SSB Increased RF Gain mod is added to the KSB2 board, *and* the KPA100 is also in-line. The result of that combination is that there is more overall RF gain than the KSB2 ALC circuits can handle. Your K2/100 may have a bit more available RF gain on 40 meters than the average K2. The fix for the above is to change the KSB2 board ALC. 1) Cut the trace on the top of the board between P1 pin 6 and the base of Q1. 2) Install a 1k resistor over the previous cut (between P1 pin 6 and the base of Q1). 3) Change the value of R9 to 1.5k. These changes were first suggested by Gary Surrency of Elecraft support. You gentlemen may wish to try this even if you do not have the KI6WX mod installed. I do not believe it will cause any other difficulties. It is a mystery to me why the situation is not present with the display in ALC mode, but then I am not familiar with all the internal workings of the KSB2 firmware. My guess is that the slight additional load provided when monitoring the ALC level is sufficient to control the overdrive. 73, Don W3FPR -- View this message in context: http://www.nabble.com/K2-KPA100-40M-SSB-ALC-Problem--tp15664230p17041040.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
