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

[Björn]

Marcelo,

In addition to others suggestions

Gain requirement - “10 to 33 dB at receiver input“

Your antenna could well be overdriving the receiver input.

/Björn

Sent from my Phone

> On 19 Sep 2022, at 21:34, 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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