Alexander, The method indicated in the manual should work fine. If you have a fast DMM, you may be able to find a deeper null by monitoring the voltage at the 'hot' end of the R2 potentiometer while adjusting for the null - just adjust for the lowest voltage.
After setting the null, do not change the capacitor trimmer. Set the ATU menu to CALP and adjust R1 until the power indicated on your K2 is the same as on your external wattmeter. Your K2 is now as accurate as your external wattmeter. Then set R2 to the same mechanical position as R1 for reasonable SWR indications. The accuracy of external wattmeters is not really very good, and some may be in error by as much as 20% of full scale (check your meter s specifications). Notice that if you are on a 100 watt scale, that means that your external wattmeter may be incorrect by as much as 20 watts at any point on the scale. Even at a 5% specification (Bird slug right after calibration), it may be off by as much as 5 watts with a 100 watt slug. 73, Don W3FPR > -----Original Message----- > > Please help me to find the best method "Null"-adjustment for > SWR-bridge in KAT2. > > When I re-check internal SWR-meter with external one, I see that > my K2 has wrong. > > Thank! > 73! > 72! > Alex de UR5LAM > www.qrp.ru > -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.432 / Virus Database: 268.15.24/592 - Release Date: 12/18/2006 1:45 PM _______________________________________________ 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
