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

[Scott Qi]

Hi, it is a old version of NMEA protocol, I ever made a PCB (using 
GT-8031F card) this year to replace it (correct the GPS rollover 
problem), but seems few people need it, so I did not sell it, now I am 
moving, need to find which box include the PCB (I have more than 50 
boxes to move).

for the old Z3801A or Z3805A, using Motorola M6 or M8 GPS module, need 
to upgrade the firmware (replace the 4 firmware chip easily).

On 11/11/2024 12:19 AM, Tom Knox via time-nuts wrote:
> 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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