[time-nuts] GPS message jitter (was GPS for Nixie Clock)
jimlux at earthlink.net
Mon Jul 18 18:46:44 EDT 2016
On 7/18/16 1:44 PM, Scott Stobbe wrote:
> Well, I suppose in the case of USB, the host hardware (consumer PC) is not
> going to have any special hardware. But, if a gps receiver implements a USB
> interface, in addition to standard NEMA data, it could also report the
> phase and frequency error of your USB clock (since it has to recover it
> anyways to get the usb data).
The USB interface timing is going to be buried deep, deep inside some
microcontroller or ASIC. Imagine a FTDI part, for instance. I can't
imagine a GPS mfr caring enough about this to spend any money on trying
to figure out how to do it.
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