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

[paul swed]

Easy on the differential output take 1 side and drive single transistor
emitter follower.
They are nice looking units. Though the price is magically up.
Have fun
Paul
WB8TSL

On Sat, Aug 13, 2022 at 12:17 PM Daniel Watson via time-nuts <
time-nuts at lists.febo.com> wrote:

> 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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