Hi The holdover uncertainty prediction is far more a function of your OCXO than of the GPS.
Bob On Dec 21, 2012, at 12:00 PM, Ed Palmer <[email protected]> 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. > > Ed > > On 12/21/2012 10:26 AM, W2GPS wrote: >> Tom, >> >> 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. >> >> Rick >> >> -----Original Message----- >> From: Tom Van Baak [mailto:[email protected]] >> 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 >> for. >> >> /tvb > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
