[time-nuts] Re: EOL Trimble 99889-00 : Protempis replacement ?

[Bob Camp]

Hi

On a GPSDO (any GPSDO), once the unit is in holdover, the GPS / GNSS module is out
of the control loop. If it was back in the control loop, that’s the definition of “out of holdover”. 

Bob

> On Sep 11, 2023, at 6:12 PM, Ed Marciniak via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> Is <7us holdover a drop in replacement for the Trimble part? More to the point, does software require adjustments to completely ignore the module during holdover with such awful performance limits?
> ________________________________
> From: Gregory Beat via time-nuts <time-nuts at lists.febo.com>
> Sent: Monday, September 11, 2023 2:18:24 PM
> To: time-nuts at lists.febo.com <time-nuts at lists.febo.com>
> Cc: Gregory Beat <w9gb at icloud.com>
> Subject: [time-nuts] EOL Trimble 99889-00 : Protempis replacement ?
> 
> Trimble has declared their Resolution-SMT GPS chipset (Trimble 99889-00)
> found on the 66226-A1 GPS Timing Module Carrier Board as End of Life.
> So, as expected the normal Surplus avenues are beginning to show these Trimble GPS/GNSS boards for sale.
> ==
> Protempis, a GNSS chip company appears to have a multiple constellation GNSS receiver for the Timing market, that is Pin-compatible.
> I have not looked at detailed pricing.
> https://www.protempis.com/_files/ugd/cd4160_9105468f94c84954ba04ac5e2781b088.pdf
> 
> Has anyone attempted this “Brain Surgery” swap on the Trimble carrier board ?
> It would require Hot Air handpiece and Surface Mount skills.
> 
> greg
> w9gb
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