[time-nuts] Re: Please help. Motorola Oncore

[Bob kb8tq]

Hi

The other gotcha depends a lot on just how long “off for a while” is. 
If any of these devices are off power for decades, the internal data 
for the almanac ( = which sats are where ) will be way off. 

The process of random search is a lot faster with the newer modules. 
They have way more processing horsepower. Just how many hours
(or days) it takes this or that example of an early module to come 
back to life …. who knows ….

Bob

> On Sep 19, 2022, at 2:14 PM, John Ackermann N8UR via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> Some of the early Motorola receivers had an issue with long-term XO drift.  That can result in failure to lock if the unit has been powered off for a long time.  There is a procedure to recalibrate it (no test equipment required).  I think it was written up in a Motorola app note that's available on line, but I can't put my finger on it right now.
> 
> John
> -----
> 
> On 9/19/22 07:53, Gregory Beat via time-nuts wrote:
>> IF you start with Fixed Position mode, THEN this speeds up process.
>> I would also suggest a CLEAR View of Sky for the Antenna.
>> Motorola Oncore UT Plus Engineering Notes (circa 2000)
>> https://synergy-gps.com/wp-content/uploads/2018/11/ut-engg-notes.pdf
>> Motorola Oncore GT Plus Engineering Notes (circa 2000)
>> https://www.tapr.org/pdf/GT_Eng_Notes.pdf
>> UT Plus model numbers:
>> R5122U111x - right angle OSX
>> R5222U111x - right angle OSX, on-board Lithium battery
>> R5122U115x - straight OSX
>> GT Plus model numbers:
>> R3111G111x - standard version
>> R3211G111x - on-board Lithium battery
>> R3111G114x - SMB antenna connector
>> greg, w9gb
>> ==
>> Date: Sun, 18 Sep 2022 08:42:18 -0400
>> From: Marcelo Dantas <marcelo.f.dantas at gmail.com>
>> Subject: [time-nuts] Thanks for adding me, and please help. Motorola Oncore
>> To: time-nuts at lists.febo.com
>> Hi there Everyone,
>> Thanks for accepting me to this list.
>> I am in (dire) need of help here and maybe one of you is a Motorola Oncore
>> user and could assist.
>> I have a couple Motorola Oncore modules, which I use mounted to a
>> "baseboard" for timing purposes.
>> One is a R5222U1115 and the other a R3111G1112.
>> They have been sitting in a drawer for some time. Being "some time" since
>> the pre-pandemic era.
>> Now I am trying to use them again but for whatever reason they won't lock
>> to any satellites.
>> The modules are starting up, sending 1pps and seem to be accepting commands
>> correctly.
>> I have also tested the baseboard (power, serial, etc) and the antenna.
>> The antenna works well on a third (non-motorola) module.
>> I have tried everything, left the modules there running for 24 hours.
>> No joy. None of them will lock to any satellites.
>> I have tried defaulting them using WinOncore, no change.
>> I have also tried to find an almanac file to upload, hoping it would help,
>> but couldn't find one with the required .alm file extension.
>> At this point I do not know what to do anymore. I have a system (module,
>> board, antenna, power, etc.) that should just work, and yet it refuses to.
>> Maybe there's some special factory reset? Maybe there's some command I do
>> not know about? Maybe other software than WinOncore with some extra
>> debug options?
>> Any guidance here would be deeply appreciated.
>> Thanks a lot in advance,
>> Marcelo.
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