[time-nuts] Re: GPS receiver with reference clock input

[comsec22]

Keelan ciao,

I have the same input (capability) on Symmetricom XLi, but the difference is the internal firmware can manage in a 3 different way two sources: primary (Gps) and secondary as external reference (bnc).
Let's say at the end could be just a kind of backup. In Your case (Trimble) not really useful unless the internal clock is faulty..

Cheers

Inviato da Outlook per Android<https://aka.ms/AAb9ysg>
________________________________
From: Keelan Lightfoot via time-nuts <time-nuts at lists.febo.com>
Sent: Saturday, June 10, 2023 1:37:13 AM
To: Discussion of precise time and frequency measurement <time-nuts at lists.febo.com>
Cc: Keelan Lightfoot <keelanlightfoot at gmail.com>
Subject: [time-nuts] GPS receiver with reference clock input

In my pile of Trimble GPS receivers, I have a small handful of 4000SSi CORS
receivers with a BNC clock reference input, and in the receiver firmware I
can switch the receiver over to the external 10 MHz clock. It's all
documented in the manual, but what I don't understand is... why?

I'm trying to reconcile my mental model of the GPS receiver, and in my
model, any critical timing in the receiver is all relative to the received
GPS signals, what would I gain from feeding the 10 MHz from a GPSDO other
than the more stable OCXO in the GPSDO? I imagine it might improve jitter
on the 1PPS signal...

Thanks,

Keelan
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