[time-nuts] SSR-6t Connector
lists at rtty.us
Fri Dec 21 17:12:44 UTC 2012
The holdover uncertainty prediction is far more a function of your OCXO than of the GPS.
On Dec 21, 2012, at 12:00 PM, Ed Palmer <ed_palmer at sasktel.net> wrote:
> Since I have a Z3801A this is an interesting development. Do you expect to see improved performance or is this simply to replace a dead VP receiver and bring the Z3801A back to life?
> My 6 channel VP receiver was flaky so I replaced it with an 8 channel model. My Holdover Uncertainty Prediction is now oscillating between a high of 2 - 3 microseconds and a low of 200 - 300 ns with an oscillation period of 7-9 days. It's only been running for a few weeks so I'll have to wait and see if the oscillations die out. Depending on how things settle, there might not be any need (or room) for improvement.
> On 12/21/2012 10:26 AM, W2GPS wrote:
>> Synergy already has a carrier board to put the SSR-6T receiver into a VP, UT,
>> UT+, etc. socket. All that is needed is firmware support for the old 8-channel
>> messages. I am planning to implement this capability for Synergy. It's just a
>> matter of time and priorities. Eventually Synergy will have the solution for
>> this problem. If you could gather a list of Time-Nuts people who would like one
>> or more of these and send it to Art that could speed the process along.
>> -----Original Message-----
>> From: Tom Van Baak [mailto:tvb at LeapSecond.com]
>> Sent: Friday, December 21, 2012 11:15 AM
>> To: Discussion of precise time and frequency measurement
>> Subject: Re: [time-nuts] SSR-6t Connector
>> Hi Paul,
>> I'm pretty sure the hp Z3801A and 58503A/B (and perhaps other 1990's era) GPSDO
>> use the Motorola Oncore VP receiver. It was, and still is, a famous GPS timing
>> receiver. Later, many GPSDO evolved to use the Motorola/iLotus M12 receiver.
>> The new Synergy SST-6T is a clever combination h/w and s/w that turns a uBlox 6T
>> & PIC into a PCB that is both h/w and s/w compatible with an M12. It's a drop-in
>> replacement. But as such, it won't work in a device that is uses an old Motorola
>> UT/GT/VP receiver.
>> I suggested that they also come up with a board that is VP compatible, but you
>> realize the number of 15-year-old Oncore VP's in the field is probably not that
>> high. It would make an excellent labor-of-love project to create a VP-compatible
>> uBlox 6T board, but it's probably not something you can make a business case
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