[time-nuts] Re: Seeking info on Ericsson NCD 901 56/1 devices

[John Miller]

Excellent work, and what a quick turn! The RES SMT 360 is a great module, especially given the prices of these things. Have you tried to interface with it yet? Curious if the pinout on the GPS02 applies to the 03. I would assume it would. 

Regards,
John
KC1QLN

> On Aug 12, 2022, at 10:06:27 PM, Daniel Watson via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> Hi,
> 
> I received a couple of the GPS 03 modules today and thought the list would
> be interested in some pictures of the board inside.
> 
> https://i.ibb.co/TKHdvDF/GPS03-1.jpg
> https://i.ibb.co/0j6yg5D/GPS03-2.jpg
> https://i.ibb.co/HzN94HL/GPS03-3.jpg
> https://i.ibb.co/hCsjH6f/GPS03-4.jpg
> https://i.ibb.co/kQbbptZ/GPS03-5.jpg
> 
> The unit is very easy to disassemble, just drill out the rivet on top and
> the upper half of the case will slide off. I initially attacked the clip on
> the bottom of the case, but that is unnecessary. The PCB is secured to the
> bottom half of the case with a single screw inside. Too easy!
> 
> Some of the major parts/ICs on the board:
> 
> GPS: Trimble RES SMT 360 (97975-01)
> Microcontroller: STM32F105RCT6
> Step Down Converter: TI TPS5430
> LDO Regulator: TI TL1963A
> Quad Differential Line Driver: TI AM26LV31E
> 
> Best regards
> 
> Dan Watson
> 
> On Thu, Aug 11, 2022 at 8:34 PM John Miller via time-nuts <
> time-nuts at lists.febo.com> wrote:
> 
>> Kim,
>> This is great, thanks for sharing! The GPS 02's performance looks rather
>> impressive, with 65 channels. I ordered a couple of the GPS 03s as well. It
>> looks like these are mostly plain NMEA strings, but with some additional
>> $PERC strings thrown in that are unique to the Ericsson protocol, which is
>> lightly documented in this paper:
>> 
>> http://uu.diva-portal.org/smash/get/diva2:573991/FULLTEXT01.pdf
>> 
>> Seems like a decent receiver. Looking forward to documenting it more.
>> Reminds me a lot of the Nokia FYGM, which I have documented here:
>> https://ljck.org/doku.php?id=nokia_fygm
>> 
>> John
>> 
>>> On Aug 10, 2022, at 2:45:53 AM, mail--- via time-nuts <
>> time-nuts at lists.febo.com> wrote:
>>> 
>>> Hi,
>>> 
>>> I found these for the Ericsson GPS 02 01 device (casing looks quite
>> identical to GPS 03 01...)
>>> 
>>> https://osmocom.org/projects/ericsson-rbs-6xxx/wiki/GPS_02
>>> 
>>> https://www.coursehero.com/file/35010200/Ericsson-GPS-02-01-Specspdf/
>>> 
>>> Don't know if they're of any use.
>>> 
>>> -Kim
>>> 
>>> 
>>> On 2022-08-10 03:22, John Miller via time-nuts wrote:
>>>> Hey all,
>>>> Does anyone know anything about these "Ericsson NCD 901 56/1 GPS 03 01"
>> devices? They are all over ebay and are fairly cheap.
>>>> https://www.ebay.com/itm/185337146688
>>>> https://www.ebay.com/itm/294113323964
>>>> https://www.ebay.com/itm/194342806640
>>>> They have one SMA connector and two RJ45, probably RS485? I haven't
>> been able to unearth any documentation on them at all. A few pictures of
>> boxes suggests they were made in 2016-2017 in Poland.
>>>> Any insights?
>>>> Thanks!
>>>> John
>>>> KC1QLN
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