Kevin,
I assume you are referring to the 4 MHz oscillator calibration. If so,
please understand that the optimum frequency for that reference
oscillator may be slightly different than exactly 4 MHz. It can be
refined later.
The K2 does not use that reference on a real time basis for the
frequency readout. It only has to be accurate when running the CAL PLL
and CAL FIL procedures.
At this point of your alignment and calibration, just set the C22 MHz
trimmer to mid-range. Don't worry about it until you have completed the
K2 construction and are ready for the final frequency calibration.
Then go to my webpage www.w3fpr.com article on K2 frequency calibration
and follow the procedure given there. That should result in not only
good frequency calibration of the K3 as well as properly aligned K2 filters.
73,
Don W3FPR
On 4/21/2015 7:45 PM, Kevin Hulina wrote:
> For this alignment section, it mentions using a "calibrated external
> frequency counter", or a ham/sw receiver, or later using WWV on-air.
> Since I don't have a "calibrated external frequency counter" at home,
> what are many people doing for this portion of the alignment and testing?
>
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