[Elecraft] KREF-EXT Option

[chen dave]

>
> A syntheiziser built around f.ex ADF 4001( it is also used in the K3
> synth) for locking the VCXO Z1 (49.380 MHz) to an external 10MHz is simple
> in design.

I want to know if KTCXO3 -1 is VCXO or standard TCXO?

One approach after evaluation for a completely built in module is a EEPROM
> for the PLL programming.
> At power on the EEPROM programs  the PLL
>
> Does anybody know the use of the "100Hz" P4 pin #1 ?
>
Good question, I also want to know.