Don't do that if you want to minimize distortion, Dan. Elecraft warns against EVER running the K2 with the power control full "up" in SSB modes, including PSK31. The IMD increases quickly when you exceed the rated power level (10 watts or 100 watts PEP). It's okay on CW, where the finals don't have to be "linear" but they still recommend against turning the POWER control to a setting above that which the K2 can actually deliver.
I set the soundcard drive to run BELOW the rated power so the ALC doesn't kick in. If you've modified the ALC circuit to have a better delay characteristic for PSK31 this isn't so critical, but I suspect it's a good idea to avoid ALC action in any case. I switch the bargraph to ALC mode, set my output power to 10 watts (or 100 watts if you're QRO) or less, then adjust the signal in from the sound card to a point just BELOW that at which the first ALC bar flickers. Actually I commonly set the POWER control for 10 watts, then adjust the soundcard drive for 5 watts output. That also ensures the ALC is not being activated. Also make sure your SSB Compression is OFF. Ron AC7AC -----Original Message----- Question about transmitter drive setup. I'm about to go on the air with the K2 Power knob full clockwise, and the soundcard drive (Digipan) set for about 1A draw on key down. Is that right? Dan / WG4S / K2 #2456 with KPSK2, er, ah KSB2 _______________________________________________ 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
