[time-nuts] Re: New design for a GPS disciplined OCXO or Rubidium

[Pavel Kořenský]

Hi Fred,

no, I did not considered this particular module.
I looked briefly at the datasheet some time ago, but this module seems 
to be oriented for mobile/GSM tasks. It has a weird output frequency and 
the DAC SPI control allows to control max. 16bit DAC.
And 16bit DAC is really not ideal for a Rb standard which has the EFC 
input which is able to tune only +/- 1 x 10^-9 with voltage swing 0-5V 
range and long term drift of +/-5 x  10^-10/year.

The F9T which I am using is not cheap (actually, it is expensive as 
hell), but has two programmable outputs and I am using the 20bit DAC 
with the Pi Pico. Of course, there will always be some noise on the DAC, 
but extra 4 bits of precision allows some fine tuning.

PavelK


Dne 21.05.2024 v 21:06 Fred Fierling via time-nuts napsal(a):
> Hi Pavel,
>
> I’m curious if you considered using the uBlox M8F, which is designed to discipline external oscillators? You can get corrective data either through any of its interfaces, or from an external DAC.\
> \
> Fred
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