Hi Frank, You might like to search the Elecraft Email List User Group for references to R98. There are a lot of mails concerning changing that resistor value to reduce the basic K2 power jumping. Things of course worsen with the KPA100 fitted. I changed my R98 from 270 ohms to 1k, and it made quite a difference. It reduces the overall gain in the BFO ALC loop.
73 Stewart G3RXQ On Mon, 5 Dec 2005 09:04:21 +0100, Frank DL4KQ wrote: > G`day, > > > I`m running a K2 + EC2(KAT100/KPA100), fully loaded, actual fw`s, which > seemed to work fine. > But driving an external linear amplifier (tune situation) I noticed > inacceptable rf output fluctuations of the KPA100. > (measured on antenna as well as on dummy-load) > > > K2 (alone): obviously no output fluctuations > K2+KPA100 (independant of KAT100 settings: bypass or auto mode): > 1. jumping output fluctuations of 10 to 15 W on all bands > 2. height of fluctuation nearly independant of K2 power knob setting; f.e. 10 > W jumps at 30 W as on 50 W or any other driver setting. > 3. fluctuation depends on K2 power knob setting, there exist ranges with and > without fluctuation (on same band), obviously different ranges for different > bands. > > > Asked a friend to come along with his K2+EC2 (also fully loaded, actual fw`s) > for test changing of components. > But his K2+EC2 showed same behaviour. > Btw, another K2/100 + KAT100 (all but KX60V options) showed same behaviour > but fluctuation was less (max. 8 W). > > 10-15 W jumps are a bit "much" ... :-(( > > Any ideas? > > Frank, DL4KQ > _______________________________________________ > 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 _______________________________________________ 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
