Posted by
Don Wilhelm-3 on
Sep 02, 2005; 4:17am
URL: http://elecraft.85.s1.nabble.com/K2-s-4-MHZ-Master-Oscillator-tp381793p381795.html
Bob, Earl and folks,
Earl's comments are correct, but CAL FIL must also be run before calibration
is complete. Each BFO must be changed by at least one 'notch' and moved
back to the same frequency (aqssuming the filters were properly set before).
The K2 must detect that each BFO has been changed because that is the only
time new values are written to EEPROM.
73,
Don W3FPR
-----Original Message-----
"I used Wayne Burdick's article to calibrate my K2. When I first tuned in
WWV, the zero beat was at 9999.5. I adjusted c22 & measured TP1(VCO) &
TP2(BFO) until the two test points matched. Now WWV zero beats at
10000.5."
----------
500 Hz is a big error. You can get it much closer.
==========
"Should I have set my dial to 10000.00 & then adjusted C22?."
----------
No! Nothing will change until you do a CAL PLL after adjusting C22.
==========
There are a number of methods of getting the 4000 kHz xtal oscillator on
frequency by adjusting C22. Without a frequency counter, one of the
easiest is to tune in 20 MHz WWV on your IC-756Pro. Use a short piece of
flexible insulated wire for the antenna on the 756Pro and bring the end
of that antenna near the 4 MHz oscillator in the K2. You'll hear the 5th
harmonic of the 4 MHZ oscillator beating with WWV (best to use the AM
mode on the 756Pro and wait for those times when WWV is not transmitting
a tone). When you hear the heterodyne beat between the 5th harmonic of
the K2's 4 MHz oscillator and 20 MHz WWV, adjust C22 to zero beat the
heterodyne.
Anytime you adjust C22, you must follow with a CAL PLL. Then check your
K2's frequency dial readout accuracy.
73, de Earl, K6SE
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