[time-nuts] GPS W/10KHz

Chris Albertson albertson.chris at gmail.com
Sat Feb 8 13:08:39 EST 2014

On Sat, Feb 8, 2014 at 9:47 AM, Magnus Danielson <magnus at rubidium.dyndns.org
> wrote:

> Bob is alluding to the fact that the receiver isn't really doing a job of
> producing that 10 kHz, just as with the PPS signal.
> As the regular adjustments occurs, the PLL is pulled here and there and
> this scales up and well... becomes quite large when you hit 10 GHz.

The OP wants to use the 10KHz signal to discipline a OCXO, not to run a
microwave transmitters (at least no directly.)   The (minutes long) time
constant on the GPSDO will even out any phase anise on the 10KHZ signal.
So using 10KHz or 1Hz makes lithe difference if you avargage over a handful
of minutes.  The final output depends mostly on the quality of the OCXO.

For a long time people stopped building GPSDOs because the Thunderbolt sold
for $100.  The price has gone up and so maybe it's time to think about how
to build a good GPSDO but with target price under $100 and simple enough
that a PCB is not required.

Chris Albertson
Redondo Beach, California

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