[time-nuts] Re: Samsung-Symmetricom GPSDO Rollover Problem

[Tom Knox]

Hi,
I would look at Synergy they have a number of UBLOX modules specifically designed for vintage Motorola
receivers.
Cheers,
Tom Knox
SR Test and Measurement Engineer
Phoenix Research Group / Ascent Concepts and Technology
4870 Meredith Way Apt 102
Boulder, Co 80303
Formerly of:
357 Fox Lane
Superior Co 80027
303-554-0307
actast at hotmail.com

https://www.thedenverchannel.com/news/marshall-fire/superior-man-moving-forward-after-losing-dream-research-lab-during-marshall-fire

"Peace is not the absence of violence, but the presence of Justice" Both MLK and Albert Einstein
________________________________
From: bryon via time-nuts <time-nuts at lists.febo.com>
Sent: Sunday, November 10, 2024 9:45 PM
To: time-nuts at lists.febo.com <time-nuts at lists.febo.com>
Cc: bryon <kd4fm at aol.com>
Subject: [time-nuts] Samsung-Symmetricom GPSDO Rollover Problem

I have a Samsung GPSR, which is a Symmetricom Z3805A.  It looks like a
Z3801A, except it has a front panel power switch.  On the rear panel it
shows its made by Symmetricom and it has stickers inside on the PCB
showing Symmetricom Z3805A, etc.  Runs off of 28 volts DC.  It also uses
the MTI-260 5 Mhz oscillator on a 5 Mhz doubler board to get back to 10 Mhz.

The unit runs, but it has the March 2004 rollover date problem.

The unit uses a Furuno GT-8031B GPS receiver.  The GPS receiver has the
form factor of a Motorola M12+ receiver and then the Furuno receiver is
mounted on an adapter board that has the form factor of the elder
Motorola PVT/Oncore VP receivers.

The Furuno runs 9600 BPS and the basic data sheet states it runs NMEA
like protocol.

I attempted to put a LEA-6T and a M12+ into NMEA mode at 9600, but they
will not do it.  I think its because they are timing only receivers and
only run binary.  I also tried to put a Motorola Oncore VP in the unit
that was set to the 6 channel mode and binary and the Samsung unit gave
a front panel fault about 30 seconds after power up.

Does anybody have any experience with a replacement GPS receiver for
this unit ?

Thanks.
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