Adding to Ron's, ZL1TW, comments about Wayne's N6KR excellent method to set the 4Mhz oscillator using WWV/WWVH or similar reference source:-
I have always found it easier to Zero beat using CW spot and the beat note between the WWVH and the spot Tone. However YOU MUST remember to switch the mode back to LSB BEFORE proceeding with changing C22 otherwise your dial will be nicely offset by your sidetone frequency. There are slight dial setting differences of a few 10s of hz if I zero beat WWVH using the different filter settings (CW normal). Using CW reverse also can change the dial reading for a zero beat slightly too. Because of this, I always zero beat with the mode set to CW normal and the 700hz filter, this being the filter I mostly use. Another slight source of error is the thermal drift between when you zero beat to WWV/WWVH and the time it takes to get C22 adjusted for both frequency readings to be different by the appropriate amount. My K2 drifts down in frequency from cold to warm so when I take the top off the K2 to connect the probes to adjust C22 it moves up slightly in frequency as it cools slightly. I usually set the final zero beat dial setting 10hz below the actual zero beat point to compensate for this. YMMV 73, Nigel ZL2DF _______________________________________________ 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
