[Elecraft] K2 PLL click educational opportunity

[lstavenhagen]

Hi all,
Sorry if these are dumb circuit-detail questions, but my K2s (the one in use
as well as the one on the bench being built) are sort of my self-education
laboratories. Yesterday while out /p in the mountains, I discovered the 5khz
PLL "click" in my #1 K2, which led to researching it in the reflector
archives, which led to learning how PLL synthesizers work which led to the
K2 schematic......

Which led to...whew...lol... my current question about the 4.000mhz
reference oscillator on the control board. My question is, it looks like the
4.000mhz osc. is the clock osc. for the main K2 CPU (U6), is that right? 

And, I would assume that adjusting it to exactly 4.000mhz is what yields the
correct dial reading because that adjusts the main CPU's clock frequency?

Just curious and apologies if my questions are a little dense...

Tnx es 73,
LS
W5QD



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