[Ground-station] Fwd: [Bod] FW: [Rmg] FW: DSLWP URGENT HELP NEEDED!
Tom Clark
tom.k3io at gmail.com
Tue May 22 22:10:32 PDT 2018
Since much of the technical savvy on GNU/Coding/Lunar & Open research &
related topics is represented here in the ground-station group, I am
forwarding this request for lunar downlink help that came from the
satellite builders at Harbin Institute in China.
73 de Tom K3IO
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-------- Forwarded Message --------
Subject: [Bod] FW: [Rmg] FW: DSLWP URGENT HELP NEEDED!
Date: Tue, 22 May 2018 22:37:04 -0500
From: Bill Tynan <billandmattie at windstream.net>
To: bod at amsat.org
*From:*Al Ward <w5lua at sbcglobal.net>
*Sent:* Tuesday, May 22, 2018 6:55 AM
*To:* ntms at yahoogroups.com
*Cc:* rmg at k5rmg.com
*Subject:* [Rmg] FW: DSLWP URGENT HELP NEEDED!
Hello NTMS and RMG
Help needed
73
Al W5LUA
*From:*Al Katz [mailto:alkatz at tcnj.edu]
*Sent:* Monday, May 21, 2018 10:43 PM
*To:* peter blair
*Cc:* 'Al Ward'; Paul Andrews
*Subject:* Fwd: DSLWP URGENT HELP NEEDED!
Hi Peter,
Would you post on Moon.
73,
Al - K2UYH
-------- Forwarded Message --------
*Subject: *
DSLWP URGENT HELP NEEDED!
*Date: *
Tue, 22 May 2018 08:59:14 +0800
*From: *
MingChuan Wei <bg2bhc at gmail.com> <mailto:bg2bhc at gmail.com>
*To: *
Al Katz <alkatz at tcnj.edu> <mailto:alkatz at tcnj.edu>
Dear Prof. Katz,
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 a 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. Both transmit once in 5 minutes.
Thank you very much!
Wei
2018-05-21 1:59 GMT+08:00 MingChuan Wei <bg2bhc at gmail.com
<mailto:bg2bhc at gmail.com>>:
Hi Al,
Thank you very much for putting in the newsletter!
Best Regards,
Wei
2018-05-20 23:29 GMT+08:00 Al Katz <alkatz at tcnj.edu
<mailto:alkatz at tcnj.edu>>:
Dear Wei,
I wish you great success with your satellite project. I will publicize
in my next EME Newsletter. If there is any news if the next few weeks
let me.
Your project should be of interest to many hams, particularly in the
satellite community.
Thank you for informing me of your project.
73, Al - K2UYH
--
Dr. Allen Katz, Prof. E/CE TCNJ
Tel 609-584-8424 Sum, Cell 609-947-3889
On 5/19/2018 2:30 PM, MingChuan Wei wrote:
Dear Prof. Katz,
I am Wei Mingchuan, a radio amateur BG2BHC and a doctor candidate of
Harbin Institute of Technology, China. We have an amateur radio club
BY2HIT and a student satellite team here, and we have launched two
amateur satellites, LilacSat-1 and LilacSat-2.
Our university is leading a lunar formation flying satellite
mission, Discovering the Sky at the Longest Wavelengths Pioneer, for
low frequency radio astronomy, amateur radio and education. The
constellation consists of two 47 kg micro-satellites, and will be
launched into a lunar transfer orbit UTC this Sunday evening, and
finally enter a 300 x 9000km lunar elliptical orbit.
Onboard each satellite, there are two VHF/UHF SDR transceivers to
provide beacon, telemetry, telecommand, digital image downlink and a
GMSK-JT4 repeater. Onboard transmitting power is about 2 W.
The first launch window will open at about 21:30 May 20th UTC. The
transmitters will be activated soon after separation. Satellite A
will transmit 500 baud GMSK with 1/4 turbo code on 435.425 MHz and
250 baud GMSK with 1/2 turbo code and precoder on 436.425 MHz, and
satellite B will transmit 500 baud GMSK with 1/4 turbo code on
435.400 MHz and 250 baud GMSK with 1/2 turbo code and precoder on
436.400 MHz, in every 5 minutes by default. Each transmittion will
last about 16 seconds. Radio amateurs in South America will have the
earliest chance to receive the signals from the satellites, then
North America, Oceania, Asia, Europe and Africa.
As the satellites will be quite far awary from earth, and the
onboard transmitting power is small, the downlink is quite weak,
similar to EME. Could you help us to find some radio amateurs who
are willing to help to receive the downlink signals from the satellites?
We will prepare different QSL cards for different flight phase for
amateurs successfully made QSO or received telemetry. Awards will
also be given to the first 10 amateurs in each continent who
successfully decoded the signals from the satellites, received the
most number of packets, or received an image.
An open source decoding software based on GNU Radio to work with
RTL-SDR and USRP is provided. Not difficult to change the grc files
to support other SDR receivers. A small proxy software will send the
decoded data to a server for real-time display.
Thank you very much and fingers crossed for a successful launch!
Best Regards,
Wei Mingchuan BG2BHC
Links:
IARU frequency coordination page:
http://www.amsatuk.me.uk/iaru/finished_detail.php?serialnum=530
Link budgets: http://lilacsat.hit.edu.cn/wp/?page_id=676
Decoder (GNU Radio OOT module): https://github.com/bg2bhc/gr-dslwp
Decoder (Linux Live CD):
https://1drv.ms/u/s!Av6J6WjI3UbMhHm8gwMr4Z_keqWH
<https://1drv.ms/u/s%21Av6J6WjI3UbMhHm8gwMr4Z_keqWH>
TLE: http://lilacsat.hit.edu.cn/tle/dslwp.txt
DSLWP-A Telemetry Display:
http://lilacsat.hit.edu.cn/dashboard/pages_en/telemetry-a.html
DSLWP-B Telemetry Display:
http://lilacsat.hit.edu.cn/dashboard/pages_en/telemetry-b.html
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