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

[Daniel Watson]

Hi,

The pinout is the same. Here is a screen shot of the message output shortly
after power on:

https://i.ibb.co/ZVrtm5y/serial-output.png

PPS I verified on an oscilloscope. LED activity is the same as the GPS 02.
At power on it does nothing for several seconds, and then blinks during
acquisition, and then goes solid green with a lock. It achieves lock very
quickly! At first power on it had lock within one minute using a puck
antenna sitting by the window in my office.

What is a time nuts approved way to convert the differential PPS to single
ended into 50 ohms? Any references would be appreciated.

Thanks

Dan Watson

On Fri, Aug 12, 2022 at 11:29 PM John Miller via time-nuts <
time-nuts at lists.febo.com> wrote:

> 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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