[amsat-bb] LongJiang and Doppler correction

Wed May 30 16:04:02 UTC 2018

Hi Mike.
I have pointing Program Tracking CC of all decoders to the 
program_tracking_dslwp-b.txt file
For me is more simple to change new downloaded file to 
"program_tracking_dslwp-b.txt" and overwrite existed then change path in 
the Program Tracking CC block of 2 or 4 decoders.

Thank you for the help!

------ Original Message ------
From: "Mike Rupprecht" <mail at mike-rupprecht.de>
To: "'Dimitry Borzenko'" <dibor at iname.com>; "'AMSAT BB'" 
<amsat-bb at amsat.org>
Sent: 30.05.2018 18:46:13
Subject: AW: AW: AW: [amsat-bb] LongJiang and Doppler correction

>Hi Dimitry,
>
>of course - you need the full path + filename ...
>
>Wei, BG2BHC is updating the files regularly. If you take a look into 
>such a tracking file you see seven columns in each line. The first 
>column contains the date and time in Unix timestamp format. The next 3 
>columns contain the position in ECEF coordinates followed by 3 columns 
>which contain the velocity in ECEF coordinates. Based on the filename 
>you can see how long this file can be used.
>
>You will get this error message (File is not find or EOF .....)  if no 
>valid information is found that match to the current time.
>
>73 Mike
>
>
>-----Ursprüngliche Nachricht-----
>Von: Dimitry Borzenko [mailto:dibor at iname.com]
>Gesendet: 30 May 2018 17:10
>An: Mike Rupprecht; 'AMSAT BB'
>Betreff: Re: AW: AW: [amsat-bb] LongJiang and Doppler correction
>
>Hi Mike.
>Understood.
>Program Tracking CC block request exact file, path is not enough.
>I should to change every day/ two days Program Tracking CC setting for 
>each demodulator?
>Or I do not understand something?
>
>Regards.
>
>------ Original Message ------
>From: "Mike Rupprecht" <mail at mike-rupprecht.de>
>To: "'Dimitry Borzenko'" <dibor at iname.com>; "'AMSAT BB'"
><amsat-bb at amsat.org>
>Sent: 30.05.2018 17:23:48
>Subject: AW: AW: [amsat-bb] LongJiang and Doppler correction
>
>>Dimitry,
>>
>>the default directory is /home/lilac/lilacsat/gr-dslwp/examples/
>>Edit the correct path in the Program Tracking CC block.
>>
>>73 Mike
>>DK3WN
>>
>>-----Ursprüngliche Nachricht-----
>>Von: Dimitry Borzenko [mailto:dibor at iname.com]
>>Gesendet: 30 May 2018 14:58
>>An: Mike Rupprecht; 'AMSAT BB'
>>Betreff: Re: AW: [amsat-bb] LongJiang and Doppler correction
>>
>>Hello Mike.
>>I saw new files but I do not know where I should to put this file
>>(which folder?).
>>
>>Regards.
>>
>>
>>------ Original Message ------
>>From: "Mike Rupprecht" <mail at mike-rupprecht.de>
>>To: "'Dimitry Borzenko'" <dibor at iname.com>; "'AMSAT BB'"
>><amsat-bb at amsat.org>
>>Sent: 30.05.2018 14:56:51
>>Subject: AW: [amsat-bb] LongJiang and Doppler correction
>>
>>>Hi Dimitry,
>>>
>>>TLE are useles in lunar orbit.
>>>
>>>You have to update the tracking file in all four decoders.
>>>
>>>https://github.com/bg2bhc/dslwp_doc/blob/master/program_tracking_dslwp
>>>-
>>>b_201
>>>80529.txt
>>>
>>>(or later files)
>>>
>>>73 Mike
>>>DK3WN
>>>
>>>-----Ursprüngliche Nachricht-----
>>>Von: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] Im Auftrag von
>>>Dimitry Borzenko
>>>Gesendet: 30 May 2018 10:36
>>>An: AMSAT BB
>>>Betreff: Re: [amsat-bb] LongJiang and Doppler correction
>>>
>>>Hello.
>>>Have problem with running Live CD.
>>>Have made USB bootable diskONkey , system is runs.
>>>Mun Downlink Proxy is configured and Orbit TLE can be downloaded, but
>>>ALL ports is NOT connected!
>>>RTL is running and freq. calibrated.
>>>Also while running Decoder got 4 terminals running and have some
>>>message about "File is not find or EOF ....."
>>>
>>>What I did wrong?
>>>
>>>de 4z5cp.
>>>
>>>
>>>------ Original Message ------
>>>From: "Scott" <scott23192 at gmail.com>
>>>To: "AMSAT BB" <amsat-bb at amsat.org>
>>>Sent: 30.05.2018 2:30:33
>>>Subject: Re: [amsat-bb] LongJiang and Doppler correction
>>>
>>>>Hi Jean Marc.
>>>>
>>>>I have tried to follow the news of these lunar satellites.  While
>>>>several of the guys with DSN capability have received the S-Band
>>>>downlinks, I'm not aware of anyone hearing anything on 70cm past the
>>>>first day as the sats left Earth.
>>>>
>>>>In fact, even though I am listening every night for the 70cm
>>>>telemetry (using the team's GNU Radio flowgraphs), I have not heard
>>>>any confirmation that the 70cm transmitter is even on (telemetry 
>>>>-or-
>>>>JT4).
>>>>
>>>>-Scott,  K4KDR
>>>>
>>>>
>>>>=======================================================
>>>>
>>>>-----Original Message----- From: Jean Marc Momple
>>>>Sent: Tuesday, May 29, 2018 12:37 PM
>>>>To: AMSAT BB
>>>>Subject: Re: [amsat-bb] LongJiang and Doppler correction
>>>>
>>>>Dear All,
>>>>
>>>>May be a stupid question for the experts, but genuine from me.
>>>>
>>>>Has anyone received any FT4G beacon signal from the Longiang Sats so
>>>>far?
>>>>
>>>>I have being trying to do so for the past week without success.
>>>>
>>>>73
>>>>
>>>>
>>>>Jean Marc (3B8DU)
>>>>
>>>>
>>>>
>>>>
>>>>>On May 26, 2018, at 8:54 PM, Nico Janssen <hamsat at xs4all.nl> wrote:
>>>>>
>>>>>
>>>>>In the coming days the doppler shift on the 70 cm downlink of
>>>>>LongJiang 2 will vary between +2000 and -2200 Hz (for my QTH).
>>>>>This can easily be calculated with GMAT using the script I 
>>>>>published
>>>>>a couple of hours ago (see my earlier post).
>>>>>
>>>>>73,
>>>>>Nico PA0DLO
>>>>>
>>>>>On 26-05-18 17:44, charlie at sucklingfamily.free-online.co.uk wrote:
>>>>>>Michael
>>>>>>
>>>>>>I think that there are three main components to the Doppler shift
>>>>>>for a satellite orbiting the moon.
>>>>>>
>>>>>>1.  Earth rotation moving the observer toward the moon at moonrise
>>>>>>(+ve
>>>>>>Doppler) and moonset (-ve).
>>>>>>
>>>>>>2.  Earth-moon distance variation (smaller than 1, and very slowly
>>>>>>changing in comparison).
>>>>>>
>>>>>>3.  Orbital velocity of the satellite itself.
>>>>>>
>>>>>>1 and 2 are easy to work out using EME software, eg WSJT-X or
>>>>>>Moonsked. I can't help with 3.
>>>>>>
>>>>>>Taking today as an example, total of 1 and 2 for the moon vary 
>>>>>>from
>>>>>>~
>>>>>>+3
>>>>>>to -4.5kHz at S-Band.
>>>>>>
>>>>>>With DSN satellites many of us use(d) JPL Horizons to calculate
>>>>>>Doppler shift for Deep Space missions.  Observing the Doppler 
>>>>>>shift
>>>>>>change when probes were captured by the target planet was quite
>>>>>>interesting (a slowly changing shift to a cyclic one).
>>>>>>
>>>>>>73
>>>>>>
>>>>>>Charlie G3WDG
>>>>>>
>>>>>> > I find that an interesting question. One would think that since
>>>>>> > the
>>>>>>moon
>>>>>>>orbits the earth at a much much slower rate than a satellite that
>>>>>>>there would be almost no Doppler correction required. If you
>>>>>>>compensate for the speed of the orbit around the moon that is 
>>>>>>>also
>>>>>>>at a much lower speed than a Earth satellite would be traveling
>>>>>>>at.
>>>>>>>Earth satellites are in the 17,000 mph range and moon satellites
>>>>>>>are in the 2000 mile an hour range orbiting speed. Also the 
>>>>>>>chance
>>>>>>>that the satellite orbiting the moon could be at such an axis
>>>>>>>where it is in full visibility the earth the whole time, at that
>>>>>>>point there would not be a Doppler correction based upon 
>>>>>>>satellite
>>>>>>>velocity only the moon's velocity. Will be interesting to hear 
>>>>>>>the
>>>>>>>experts chime in on this.
>>>>>>>
>>>>>>>Michael Vivona
>>>>>>>Sent from my iPad
>>>>>>>
>>>>>>>On May 25, 2018, at 5:49 PM, Stefan Wagener <wageners at gmail.com>
>>>>>>>wrote:
>>>>>>>
>>>>>>>The problem will not be the pointing (you could just point to the
>>>>>>>moon :-) Pending distance, speed and orbit around the moon and
>>>>>>>position to earth, you might have a difficult time adjusting for
>>>>>>>doppler. I let more knowledgable folks chip in on this one.
>>>>>>>
>>>>>>>Stefan, VE4NSA
>>>>>>>
>>>>>>>>On Fri, May 25, 2018 at 2:40 PM Jordan Trewitt
>>>>>>>><jmtrewitt at gmail.com>
>>>>>>>>wrote:
>>>>>>>>
>>>>>>>>If it was the 70 cm downlink, you might be able to schedule
>>>>>>>>something with someone else's SATNOGS station (idk how that'd
>>>>>>>>work with getting a rotator to work though), if they have a 
>>>>>>>>large
>>>>>>>>enough yagi that is.
>>>>>>>>-Jordan
>>>>>>>>KF5COQ
>>>>>>>>
>>>>>>>>>On Fri, May 25, 2018, 12:46 PM Zach Metzinger
>>>>>>>>><zmetzing at pobox.com>
>>>>>>>>>wrote:
>>>>>>>>>
>>>>>>>>>>On 05/25/18 11:25, Nico Janssen wrote:
>>>>>>>>>>
>>>>>>>>>>It is confirmed from China that LongJiang 2 has performed a
>>>>>>>>>>successful braking maneuver, so that it is now in lunar orbit.
>>>>>>>>>>No further details yet.
>>>>>>>>>Nico,
>>>>>>>>>
>>>>>>>>>Do you know of any WebSDRs which are pointed and tuned to the
>>>>>>>>>downlink signals?
>>>>>>>>>
>>>>>>>>>73,
>>>>>>>>>
>>>>>>>>>--- Zach
>>>>>>>>>N0ZGO
>>>>
>>>>_______________________________________________
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>>>>views
>>>>of AMSAT-NA.
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>>>
>>>_______________________________________________
>>>Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
>>>to all interested persons worldwide without requiring membership.
>>>Opinions expressed are solely those of the author, and do not reflect
>>>the official views of AMSAT-NA.
>>>Not an AMSAT-NA member? Join now to support the amateur satellite
>>>program!
>>>Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>>>
>>
>