[time-nuts] Raspberry Pi TCXO Hat

[Achim Gratz]

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

That site red-zones my BS detector…

> 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.

The one for the Ethernet controller is useless even for the seemingly
intended application.  Replacing the main crystal with a TCXO may or may
not help NTP performance depending on how much temperature effects are
currently dominating it.

> 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.

You'd be much better off taking not of the injection point and then use
a GPS timing module that can produce a clean 19.2MHz clock.  I still
have that way down on my to-do list; although I was going to try and
inject the clock without actually desoldering the crystal so it would
still work even when the GPS module doesn't provide a clock.


Regards,
Achim.
-- 
+<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+

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