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I saw the diagram of your up-down converter for NB and I am particularily interested in the 27 MHz blocks.
as far as I understand you use a stabilized PLL oscillator (by DF9NP) to "synchronize" somehow a 27 MHz crystal oscillator.
do you mind share the schematic of this oscillator?
I tried but it appears as not possible to add pictures or schematics in this post.
Will therefore send it to your regular mail address.