[time-nuts] Re: Motorola UT Still Going

[Magnus Danielson]

Hi Art,

Thanks for the plot. I think I have a few VPs around, and natually an M12+.

The "hill" around tau=1000s seems to be in the rough scale of a handfull 
of ns errors, which makes at least me think about sawtooth error, and 
what clock is used to generate PPS, dvs. compensation of sawtooth 
errors. If you could spread some light into what the numbers are it 
would be appreciated.

While things in general is improving is good, but it is also clear that 
oldest (VP - blue) is not worst.

I used to find datasheets for the Motorola GPS receiver chips. Do you 
happen to have that in your stash so you can share with us for historic 
reference?

Cheers,
Magnus

On 2024-03-05 06:58, Art Sepin via time-nuts wrote:
> That's good news, Gary. I recall that one of the UT+ firmware versions had the capability of operating past the 1024 week mark (but may have had bug fixes in a later version).
>
> How important one of the SSR replacement receivers becomes is application dependent. For many general timing applications, some SSR features may not matter but for updating legacy timing instrumentation, there are proven gains to be achieved over the original Motorola VP, UT+ and M12x receivers. Like better sensitivity means tracking more satellites at a given location;  accuracy of PPS ~ 21 ns for SSR vs. ~50 for UT+; anti-Jamming Performance in EMI Environments; no receiver 1024 Week Roll-Overs; four times faster TTFF than UT+ (not that important for always-on applications) and especially much better ADEV performance in legacy timing instruments.
>
> Apologize in advance for the unintended overt commercial tone of this response!
>
> Art
>
>
> -----Original Message-----
> From: Gary Myers <gary at geekslounge.com> On Behalf Of Gary Myers via time-nuts
> Sent: Sunday, March 3, 2024 4:46 PM
> To: time-nuts at lists.febo.com
> Cc: Gary Myers <gary at geekslounge.com>
> Subject: [time-nuts] Motorola UT Still Going
>
> I got my Tac2/Motorola UT+ out of the closet and fired up Tac32 on my
> Win11 box. The UT is still going strong with no rollover and is currently on GPS Week 2304. I have a 16-channel Synergy SSR replacement but have seen no need to swap it in.
>
> Are there others out there still running their old rola's?
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com To unsubscribe send an email to time-nuts-leave at lists.febo.com
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe send an email to time-nuts-leave at lists.febo.com