[time-nuts] SSR-6t Connector

paul swed paulswedb at gmail.com
Fri Dec 21 17:17:27 UTC 2012

My 3801 has been working fine. But I had read on time-nuts the issues with
the flaky rcvr and thats why I became interested. The 3801s are getting
pretty old. I had to change a 6sk7 in the pre-amp. ;-)

On Fri, 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.
> 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: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)
>> 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
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