[time-nuts] GPS message jitter (was GPS for Nixie Clock)

Bob Stewart bob at evoria.net
Mon Jul 18 19:28:05 EDT 2016

Interestingly enough, the Ublox LEA series of timing receivers has a USB port which you can connect directly to a USB cable.  Of course you want to use an ESD device, etc.


      From: jimlux <jimlux at earthlink.net>
 To: time-nuts at febo.com 
 Sent: Monday, July 18, 2016 5:46 PM
 Subject: Re: [time-nuts] GPS message jitter (was GPS for Nixie Clock)
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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