Just in case anyone else is suffering from unstable power out in tune mode, I followed Don’s advice (as below) and changed R98 on the RF (270ohm) board for a 1.5K resistor (I actually had a measured value of 1.64K on the POT but 1.5k was the closest fixed resistor I had).
Now when I enter tune, power output is much more stable, although it still creeps up slightly with time. This makes tuning my DX-1 a lot easier and I'm not tripping the amp out! Power out on 10m is down a little on the basic K2 (about 12w max), but I'm still getting 100w with the K2/100.. David, VK2NU >If the variation is quite bothersome, your K2/100 may be a candidate for >increasing the value of R98 (on the bottom of the RF Board) to slow down >The power variation. If you increase it too much, the power output on >the higher bands may decrease (check that with the basic K2, not with >the KPA100 powered). In most cases, about 1k is the upper limit for the >value, but if your K2 has greater gain than the average, you may find >success with even higher values. It is easiest to substitute a 2k pot >for R98 when testing for the best value, then measure the pot resistance >and put in the nearest fixed value resistor. >This procedure is listed on the Elecraft website - in Builder's >Resources IIRC. >73, >Don W3FPR No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.463 / Virus Database: 269.5.10/774 - Release Date: 23/04/2007 5:26 PM _______________________________________________ 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
