[Elecraft] KREF3 External Reference card

[Jan Holmer SM6TUW]

Hi
Someone pointed out that we all have different 49 MHz oscillators. I guess
that many K3 owners have TCXO and thus no input for the voltage control 
i.e. VCXO. This pin is indicated in the KREF3 shematic as pin 1  (VCTRL) of
Z1. 
My KTCXO3-1 did not have this pin and could not be used vith the reference
PLL so I had to replace it with a VCXO.
*The design of the PLL is fairly simple and can be built on a small board
plugging directly into J4.
*One has to consider the resulting phase noise and spurs of the locked
KREF3.
*The Kref 3 must also fall back into a default mode when the extref is
removed or if the PLL unlocks. 

I wonder if the promised optional board foor the K144XV allowing lock of the
116/118 MHz XO to the KREF3 is also cancelled ?
In that case we need the K144XV shematic.......

Jan
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