[Elecraft] [K3] KREF3 External Reference Option

[AD6XY]

Great news, I have been waiting for this option ever since my K3 arrived.

The method implies the phase noise of the 10MHz reference is not so
important - which is useful to know. 

My high spec reference is 5MHz and my cheap one 10MHz. The 10MHz will have
worse phase noise than the TCXO in the K3 - though at the low frequencies it
is not such an issue as it is at VHF and above. The 5MHz one is good - but
it takes a long long time to lock. With the count method, it should not
matter. 

Mike
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