Adam, if you come up with some sort of TXCO daughter board, I would likely take ten of them, honestly.? I have a lot of projects that use si5351 boards and have long wondered why this hasn't been available.? One other option that I have considered is a 2.5x multiplier chip (NB3N502) feeding the si5351 to use an OCXO (lots are available as pulls from China cheaply) that could also be used.? YES, you can actually feed in 10 MHz into the si5351a and have it lock, but it is out of spec to do so.? 25 MHz or 27 MHz is considered standard for the si5351a... 27 MHz TXCOs are easier to find in the US for some reason..
Thanks for the quick shipping on my adx-s and cpk3.? The cpk3 is already built and works as expected.? 16 days door to door (for those who asked) with most of the delays on the US side.? China post tracking is scary good...USPS is a blackhole... I will try to post a picture or two later of the assembled receiver.?
It might be a few weeks before I tackle the ADX-S.? :)?
Fred W0FMS/7
Fred Spinner