[time-nuts] Short term 10MHz source

[Bob kb8tq]

Hi

Use the Rb as your reference and log the time offset of its PPS. Manually steer vs a 10 hour
GPS PPS data set once a week. You probably will stretch it out to a couple weeks after things
settle in.

More or less:

PPS starts at some offset. Call that zero. 

As the days go along: 

PPS goes positive = your frequency is high. 
PPS goes negative = your frequency is low.

A week later, look at the PPS relative to your zero. 
Do the math to work out the frequency offset. 
Measure frequency against the GPS with the TICC with maybe a 1,000 second gate time
Adjust the frequency by the required offset. 
Log the final PPS offset and use it as the new zero. 

There are a lot of other ways to do it, but the technique above does work. An alternative is
to monitor the EFC on the Rb and assume it has a constant slope. With a digitally tuned 
Rb, this all is “free”. 

Bob

> On Jan 1, 2019, at 10:56 PM, Chris Burford <cburford1 at austin.rr.com> wrote:
> 
> I have a situation in which I have access to a GPSDO 10MHz source but for only about 10-12 hours at a time. My current residence does not allow a permanent GPS antenna therefore I am limited in its use.
> 
> I do realise that the long term stability of the GPSDO is somewhat superior to a Rubidium source. I'm planning on using my TICC to validate both my GPSDO and RFS. I'm aware that such a short "power on" period is somewhat counterproductive but I have no other options. I'd like to know if a 6-8 hour window for the GPSDO is sufficient for use as a 10MHz source for the TICC.
> 
> I appreciate any and all comments.
> 
> Regards,
> 
> Chris
> 
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