Mike and all,
An external 4 MHz oscillator does not work because there is no provision to
inject an external oscillator into the MCU in place of the crystal
oscillator. It would require a hardware mod to use it.
Setting the reference oscillator accurately is not difficult - if you have a
very accurate external counter, you can read the same frequency source with
both the internal and external counter and simply match the interal counter
reading.
The newer method of setting the reference now on the Elecraft webside
(previously known as the 'N6KR method') is even more accurate because it
automatically compensates for slight variations in the reference frequency
required - a few folks have reported that the reference must be set a few
cycles away from 4 MHz for the most accurate results.
73,
Don W3FPR
----- Original Message -----
Thanks for this explanation. Is there an implication here that if you had
a
more accurate external 4MHz source you could switch it in when you run CAL
PLL to get a more accurate result in the look-up table?
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