[time-nuts] Re: GPS Disciplined Symmetricom TimeSource 2700??

[Bob kb8tq]

Hi

I believe you will find that most of the standards in the TimeSource boxes 
do not have the PPS disciplining option built into them. Next layer to the 
problem is that even if they do, the algorithm used is not really up to the
task of dealing with a GPS PPS. There are a range of issues that come up….

The main reason these boxes flooded eBay a decade or more ago was that
CDMA turned out to be a less than ideal time source. They mostly are useful 
as a (hopefully cheap) source to pull a standard out of …..

The best way to discipline the source is to use the tuning voltage input and 
drive it with custom hardware to lock to GPS. 

Bob

> On Aug 13, 2022, at 4:03 PM, fwbray--- via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> As mentioned in a prior posting, I have a Symmetricom TimeSource 2700 that gets (got?) its timing data from CDMA sites.  With the demise of CDMA, I am looking for another way to discipline it as a frequency standard.
> 
> It has the ability to receive timing information from the internal PSA 10, T1 spans, and remote 5mHz oscillators. The BesTime Ensemble Timing Generator uses statistical clock models to analyze each clock, and to synthesize highly stable output timing signals.
> 
> My thought is to use the 1PPS input on the PSA 10 with a GPS 1PPS output to provide the timing signal.  This should result in a GPS disciplined 2700.
> 
> Has anyone else modified the TimeSource 2700 in this fashion?
> 
> I suspect that the Ericsson GPS 03 01 might be an option assuming the voltage levels can be made compatible.  So, I'll be experimenting once I receive my units.  However, I'm a novice at this so I'm looking for advice.
> 
> Thanks.
> 
> KE6CD
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