[time-nuts] Raspberry Pi TCXO Hat

[Richard Laager]

I stumbled across this product listing:
https://www.teradak.com/products/115.html

It's a Pi hat that contains two TCXOs, one at 19.2 MHz for the CPU and
one at 25 MHz for the Ethernet controller. It's a rather permanent
modification, as you have to desolder the stock crystals and replace
them with wires going to the hat. I'm not 100% sure how to order the hat
yet, but they gave a price of $46 (USD) via email.

I'm curious if this would provide any meaningful improvement in system
clock accuracy, for NTP, if I'm already a GPS PPS hat. If there's a
reasonable chance this could be interesting, I'm thinking about ordering
a couple and "sacrificing" a Pi 3 and/or Pi 4.

In terms of mounting both hats, I'm guessing that the TCXO is only using
power from that hat connector, so rather than use the hat connector, I
would just solder some wires to it and the Pi, such that I could stack
the TCXO on top of the GPS hat physically but not need to connect them
electrically.

-- 
Richard