Kevin, The RA resistor on the thermistor board is intended to compensate for drift AFTER warmup - such as drift that might occur due to the additional heating when the KPA100 is transmitting. I do not believe it would be fruitful to attempt to compensate for the initial warmup drift that one may find in the K2 - and you may wind up overcompensating and find the drift after a warmup period would be greater - it would not be good to have a K2 that does not drift when first turned on and then begins to drift after some warmup period.
Or perhaps better said, the thermistor board provides compensation for the PLL reference oscillator. There are many more components involved in the initial warmup drift - the BFO is one. It would be interesting to try, but would take a lot of controlled test conditions to verify the results. 73, Don W3FPR > -----Original Message----- > > The K2 PLL Ref Upgrade manual gives some information on typical drift i.e. > 5 to 20 Hz per 15 degrees F on 20 meters. It also explains how changing RA > on the thermistor board can better compensate for the drift. Since your > drift is consistent, I think you should be able to reduce it by adjusting > RA on the thermistor board. > > 73 Kevin w9cf > -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.432 / Virus Database: 268.15.26/601 - Release Date: 12/24/2006 11:31 AM _______________________________________________ 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
