[time-nuts] GPSDO using 100Hz

[Bruce Griffiths]

Mike Monett wrote:
> Hi,
>
> Sorry, I don't know how to reply to a post using the digest. But my
> question is if 100Hz or 10KHz are available from a GPS unit, where do they
> come from? Does that mean there is a 10MHz oscillator somewhere on the pcb
> that is just divided down?
>
> If so, then adding another PLL loop to control an external 10MHz crystal
> will just add additional noise, jitter, variable phase offset, etc.
>
> If there is already a 10MHz oscillator, wouldn't it be simpler to add a
> buffer like paralleled sections of a 74AC04 to the source, and drive a 50
> ohm coax directly?
>
> Regards,
>
> Mike Monett
>
> _______________________________________________
>   
Few GPS receivers other than Geodetic receivers and the Novatel
Superstar use 10MHz crystal oscillators.
In particular neither the the M12+T nor the Resolution-T uses a 10MHz
crystal

Bruce