My procedure is only a slight modification of Method 2 in the manual. The AGC will keep the audio level nearly constant under all but the worst conditions.
1. Select fine VFO resolution (1 Hz). 2. Select CW mode, fast AGC, and set bandwidth to 500 Hz. (You don't have to have a CW xtal filter.) 3. If using WWV, do the calibration only when the carrier is unmodulated. If you try it when there are audio tones, you may end up tuning to one of the sidebands. 4. Using CWT, tune to the calibration signal. This will get you very close to zero beat. 5. Locate CONFIG:REF CAL. 6. Tap SPOT to enable the sidetone, and adjust its level to be about the same as that of the signal. You should hear the "beat", a fluctuation in volume. If necessary, adjust the sidetone level for the strongest beat. (If you can't hear it when adjusting the sidetone level, shift the VFO a few Hz.) Tune the VFO for the slowest possible fluctuation, probably less than 1 per second. If you have trouble hearing the fluctuations, try feeding the audio to an analog voltmeter or oscilloscope. 7. Note the VFO display frequency. If it isn't within about 100 Hz of the calibration signal, adjust the REF CAL frequency in small increments, always retuning the VFO for zero beat as above, until the VFO display reads with 100 Hz of the calibration frequency. Once you get within about 100 Hz, set the VFO for exactly the calibration frequency, and adjust REF CAL for zero beat as above. (You may be close enough initially.) 8. Using the K3 utility, save the configuration. (Or record the REF CAL value.) 9. Cancel SPOT and exit the menu. 73, Scott K9MA > Scott Ellington Madison, Wisconsin USA ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
