[amsat-bb] LongJiang and Doppler correction

Wed May 30 15:10:29 UTC 2018

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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>>
>>_______________________________________________
>>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
>>
>