[amsat-bb] Chinese Lunar sats

Wed May 23 14:38:11 UTC 2018

Chinesse Lunar Sats AZ/EL, Dopplers & modes live available at
http://amsat.org.ar/pass?satx=dswla,dswlb , Keps updated daily.

73, LU7ABF, Pedro

On Wed, May 23, 2018 at 11:24 AM, Scott <scott23192 at gmail.com> wrote:

> I've continued to use the original TLE (
> http://lilacsat.hit.edu.cn/tle/dslwp.txt) provided for this lunar transit
> period in both Orbitron & GPredict.   That's resulted in a very
> slow-changing AZ/EL over a 6 or 7 hour period each evening here.  Using
> last night as an example, Orbitron put the doppler change to 436 MHz at
> about 2 KHz less.  With such slow-changing AZ/El, I've just been turning
> the rotator manually.
>
> However, I only used that RF value for scanning around with HDSDR to
> manually look for signals.
>
> In the GNU Radio flowgraphs provided by the project team (
> https://github.com/bg2bhc/gr-dslwp), there is a block in each decoder that
> accommodates doppler.  I saw a tweet this morning from the cubesat team (
> https://twitter.com/bg2bhc/with_replies) that indicated that they hoped to
> update the .TXT file that those flowgraph blocks use today.
>
> -Scott,  K4KDR
>
>
> =========================
>
> On Wed, May 23, 2018 at 6:18 AM, Jean Marc Momplé <
> jean.marc.momple at gmail.com> wrote:
>
> > Dear All,
> >
> > Thanks for all the good advices and infos. I will have to learn
> > Ubuntu/Linux for the decoder, will try this week-end and hopefully get
> the
> > decoder working. However the sats may be too far for my setup as having
> > only one 16 ele. cross yagi only on 70cm + good quality preamp,
> >
> > I believe that FT4 transmission should work (at least Rx), hopefully.
> >
> > Until the birds reach the moon pointing the antenna is very important, I
> am
> > using the Celestrack Keplers elements with SatPC32. Any expert with outer
> > space antenna pointing to confirm that this is OK?
> >
> > I also not sure if SatPC32 will handle the Doppler properly and if
> > any special setting required. Anyone have any ideas about this?
> >
> > 73
> >
> > Jean Marc (3B8DU)
> >
> >
> > On 23 May 2018 at 04:19, Dave Webb KB1PVH <kb1pvh at gmail.com> wrote:
> >
> > > From earlier post.
> > >
> > > 韦明川 via <https://support.google.com/mail/answer/1311182?hl=en>
> amsat.org
> > > May 19 (3 days ago)
> > > to amsat-bb
> > > Hi OMs,
> > >
> > >
> > > If the One Drive link for DSLWP does not work, please have a try with
> > this:
> > > https://drive.google.com/file/d/16YQ3XvQ9hLp6ckpwFj4OkxO2ONzJ8
> > > ZSw/view?usp=sharing
> > >
> > >
> > > 73!
> > >
> > >
> > > Wei BG2BHC
> > >
> > >
> > > On Tue, May 22, 2018 at 8:06 PM, Walter Holmes <walterh at k5wh.net>
> wrote:
> > >
> > > > So where is this LIVE cd that is mentioned for these new sats?
> > > >
> > > > Thanks,
> > > >
> > > > Walter/K5WH
> > > >
> > > > -----Original Message-----
> > > > From: AMSAT-BB <amsat-bb-bounces at amsat.org> On Behalf Of Larry
> Howell
> > > > Sent: Tuesday, May 22, 2018 3:27 PM
> > > > To: Scott <scott23192 at gmail.com>; amsat-bb at amsat.org
> > > > Subject: Re: [amsat-bb] Chinese Lunar sats
> > > >
> > > > Scott and the other Windows users,
> > > >
> > > > Windows is completely ignored.  The live Linux CD is live!  You
> insert
> > it
> > > > in your DVD/CD drive and reboot your PC.  Linux will load into RAM
> and
> > > run
> > > > exclusively from RAM.  It has a desktop not much different from a
> > Windows
> > > > PC or an Apple Mac.  Give it a try.  My mother started using Linux
> when
> > > she
> > > > was 84, and she certainly didn't have an IT background!
> > > >
> > > > Larry AC8YE
> > > >
> > > > On Tue, May 22, 2018 at 1:50 PM, Jean Marc Momple <
> > > > jean.marc.momple at gmail.com> wrote:
> > > >
> > > > >
> > > > > Scott,
> > > > >
> > > > > Thanks and my greetings to you also.
> > > > >
> > > > > Very clear and thank you for the insights.
> > > > >
> > > > > Unfortunately I don’t have the required skills about linux and IT,
> in
> > > > > spite having quite a good RF knowledge (some 40 years
> professionally
> > > > > in SATs, Mobile, PMR, microwave and mobile up to 5G now), i just
> know
> > > > > how to install the APP’s o a PC and to do some basics settings…
> > > > >
> > > > > Also, my station is quite average as yours, as the Longjiang
> > > > > experiment is quite interesting will continue to watch out and try
> > > > > receive some signals from these birds. But again wish to stress
> that
> > > > > the project managers would have much more audience and feedback if
> > > > > sharing more info (basic marketing), just a honest comment for
> > > > improvement in such future projects.
> > > > > This seems always to be the case in such HAM sat ventures, that the
> > > > > direct stakeholders are so taken with urgent matters (fully
> > > > > understood) that they fail to communicate well to get the best
> > > > > feedback after launch from the HAM community which actually would
> > help
> > > > > them a lot in assessing there bird performance.
> > > > >
> > > > > Hope my comments will help to improve our beloved projects.
> > > > >
> > > > > 73
> > > > >
> > > > >
> > > > > Jean Marc (3B8DU)
> > > > >
> > > > >
> > > > > > On May 22, 2018, at 8:42 PM, Scott <scott23192 at gmail.com> wrote:
> > > > > >
> > > > > > Greetings!
> > > > > >
> > > > > > The software on github  (https://github.com/bg2bhc/gr-dslwp) is
> > for
> > > > > > use
> > > > > in GNU Radio on linux, so a Windows computer would not be helpful
> for
> > > > that.
> > > > > >
> > > > > > In the hours after launch, several Amateurs
> > > > > > (http://lilacsat.hit.edu.cn/
> > > > > dashboard/pages_en/contribute.html) successfully decoded the 70cm
> > > > > telemetry using those GNU Radio flowgraphs (I got some partial
> > decodes
> > > > > but low SNR here prevented me from getting complete packets - but I
> > > > > was still very pleased!).
> > > > > >
> > > > > > Last night (U.S. time), I'm not aware of anyone receiving any of
> > the
> > > > > 70cm telemetry.  We were asked to watch for JT4 as well, but I'm
> not
> > > > > aware that any was received.
> > > > > >
> > > > > > As mentioned earlier in this thread, the team has lost S-Band
> > > > > > contact
> > > > > with one of the cubesats.  I'm not setup to receive those
> frequencies
> > > > > but others are watching for the signals.
> > > > > >
> > > > > > For an average station like myself, the plan will be to continue
> to
> > > > > watch for 70cm telemetry with the GNU Radio software & JT4 with a
> > > > > second SDR.
> > > > > >
> > > > > > Hope that helps!
> > > > > >
> > > > > > -Scott,  K4KDR
> > > > > >
> > > > > >
> > > > > > ===========================================
> > > > > >
> > > > > > -----Original Message----- From: Jean Marc Momple
> > > > > > Sent: Tuesday, May 22, 2018 12:21 PM
> > > > > > To: Nico Janssen
> > > > > > Cc: AMSAT BB
> > > > > > Subject: Re: [amsat-bb] Chinese Lunar sats
> > > > > >
> > > > > > Nico,
> > > > > >
> > > > > > I have been trying to capture the signals from the both Longjiang
> > > > > > sats
> > > > > for the past 2 days.
> > > > > >
> > > > > > On Monday it seems that I receive a carrier on the right
> frequency
> > > > > > but
> > > > > was not able to confirm that it was from Longjiang 1.
> > > > > >
> > > > > > I used the initial Keppler’s and now using Celestrac in SatPC32
> > > > > > which
> > > > > seems to be OK when comparing with N2YO ele/az. I have been
> > monitoring
> > > > > on the announced FX and having also JT4G “on” for about this
> evening
> > > > > without any results.
> > > > > >
> > > > > > For sure I am doing something wrong but cannot figure it out due
> to
> > > > > > the
> > > > > lack of information.
> > > > > >
> > > > > > Also, trying to get a decoder software for the GMSK telemetry is
> > > > > > quite
> > > > > difficult for a non-IT geek, I don’t have clue how to have the
> > > > > published GITHUB decoder to work on my Windows computers…
> > > > > >
> > > > > > Here we are this side.
> > > > > >
> > > > > > Quite frustrating that the communication is not that good, as if
> > the
> > > > > project team want the maximum of feedback and TLM they should
> provide
> > > > > a minimum of info. Just a personal opinion.
> > > > > >
> > > > > > Anyway will try hard to receive these birds as a real opportunity
> > > > > > for
> > > > > HAM to learn more on outer space com, if anyone can help and share,
> > > > > particularly the guys who already decoded the birds, it would be
> more
> > > > > welcomed.
> > > > > >
> > > > > > 73
> > > > > >
> > > > > >
> > > > > >
> > > > > > Jean Marc (3B8DU)
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >> On May 22, 2018, at 5:03 PM, Nico Janssen <hamsat at xs4all.nl>
> > wrote:
> > > > > >>
> > > > > >> After their launch on 2018-05-20 at 21:28 UTC, LJ 1 and LJ 2
> were
> > > > > >> maneuvered onto a track to the Moon. Several amateurs received
> > > > > >> telemetry from the satellites. But now LJ 1 appears to encounter
> > > > > >> problems.
> > > > > >>
> > > > > >> Quoting Wei BG2BHC:
> > > > > >> "Can you help to find amateurs in the US to help to monitor
> > DSLWP-A
> > > > > >> on 435.425 and 436.425 now?
> > > > > >> We lost the contact of satellite A on S band after an orbit
> > > > adjustment.
> > > > > >> We just tried to switch on UHF, but we don't know if it works or
> > > not.
> > > > > >> The sat is just above South America.
> > > > > >> If it works, 435.425 should be 500bps GMSK and JT4 alternately.
> > > > > >> 436.425 should be 250 bps GMSK.  Bothtransmit once in 5 minutes.
> > > > > >>
> > > > > >> Thank you very much!
> > > > > >>
> > > > > >> Wei"
> > > > > >>
> > > > > >> 73,
> > > > > >> Nico PA0DLO
> > > > > >>
> > > > > >> On 22-05-18 12:15, Mike Seguin wrote:
> > > > > >>> Any word on the two Chinese microsats LongJiang 1 & 2?
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