The "calibration signal" if one can call it that, is a harmonic of the crystal oscillator for the MPU on the front panel board. The nominal frequency of that crystal is 4000 kHz, but the circuit has been purposefully designed to actually oscillate lower in frequency. Most I've heard of seem to oscillate around 3999.6 kHz.
Divide that by 4.0 to get a signal of about 999.9 kHz. You'll hear harmonics, then, in the vicinity of the lower end of ham bands at: 7 x 999.9 = 6999.3 kHz 10 x 999.9 = 9999.0 kHz 14 x 999.9 = 13998.6 kHz 21 x 999.9 = 20997.9 kHz. The K1 receiver operates on lower sideband for all bands. If you have properly set your CW offset to, say, 600 Hz, then your transmitter frequency will be 0.6 kHz lower than your receiver frequency. Most hams want the frequency display to show transmitter frequency rather than receiver frequency. In that case, when you are zero-beat with a signal at, say, 6999.3 kHz, you'd want the LCD display to show 6999.3 - 0.6 = 6998.7 kHz, which will be the frequency transmitted when key-down. But there is no assurance that the MCU crystal in your unit is actually at the 3999.6 kHz used in this example. There are really very few signals out there to use as a calibration signal in the narrow confines of ham HF CW bands. The best, had you used a 150 kHz VFO span option, would be WWV at 10000 kHz. But that would have allowed you to calibrate only the 30m band. You'd still need known signals in the other three ham bands to properly calibrate your K1. The suggestion to use the signals from W1AW is perhaps about as good as you'll find in the CW segments of the several ham bands, though normally I'd want another source were it available. 73, Mike / KK5F _______________________________________________ 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
