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

[Daniel Watson]

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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