HAMFEST INDIA 2018 will be held in the silicon city of Bangalore on December 29th and 30th 2018. e will be setting up an exhibition area related to amateur radio satellites and some technical talks. Please visit www.hamfestindia2018.com for more information and registration.
AO91 and AO92 satellites have created a significant interest among the Indian Amateur Radio fraternity. Many Radio hams from all over India are building and experimenting their new antennas on these two satellites and enjoying two way contacts even during late night and early morning pass. Some of them are also working through SO-50 and IO-86 (Lapan-2) satellites. Looking forward for more activity from India on the Easy Sats.
Paddy , VU2PEP shared an update that he was able to work and hear some stations from south east asia when the FM transponder was opened up for testing on November 21st and 22nd . A video of the pass with audio is available at youtube https://youtu.be/yUR6yhdIX9s
An Amateur Radio on the International Space Station (ARISS) contact has been planned with participants at SK Putrajaya Presint 9, Putrajaya, Malaysia on 01 November. The event stated at 16:45 Indian Standard Time at 9M2RPN Satellite Ground Station located in Planetarium Negara.VU2TS,VU2DCT & VU3TYG were able to hear on 145.800 Mhz Astronaut Gregory (KF5LKT) answer interesting questions by the school children.Thanks to Sangat,9M2SS for providing the headsup of the event.
The COEP Satellite project is a student led initiative revolving around the design and fabrication of a Pico-satellite having a HAM Communication payload. COEP Ground Station was set up for servicing the Amateur Radio communication satellite “Swayam’, a 1-U cube satellite with the scientific mission of demonstrating passive magnetic stabilization. The Ground segment operates on 144 MHz band as well as the 435 MHz band with the station call sign of VU2COE. The transceivers currently operational are Kenwood TS-2000 for general amateur satellites operating on AX.25 protocol, while a custom CC1120 transponder based system is deployed for Swayam. This system works on the COEP Satellite protocol which is a custom data link and network layer protocol for short messaging. COEP Ground station is equipped with Antenna Rotator system for directional UHF Antenna. The Low noise amplifier and High power amplifier have been developed and installed at ground station.
The team has established a communication link with more than 30 different satellites, including passively stabilized satellites. The data received includes critical CW beacon data of Amateur satellites and weather images transmitted by NOAA weather satellites. The satellites transmitting BPSK, FM and BFSK are also received using Kenwood TS2000 all band all mode transceiver. A successful APRS communication was established with packet radio Digipeater on International Space Station. The High gain antenna has made it possible to receive even the low power transmitting amateur satellites. The data received from beacons of various amateur satellites is shared with teams of respective satellites helping them to monitor their satellites.
The COEP Satellite (Swayam) project is aimed at developing a reliable bidirectional communications platform. Started in late 2008, the Swayam project revolves around the challenge of building a 1U pico-satellite destined to orbit the Earth at a height of 500-800 km. The scientific objective of the mission is to demonstrate the concept of passive stabilization using magnets and hysteresis which is the first of its kind in India. The utility of the satellite is to provide point to point messaging service from one ground station to another in the HAM band frequency.
The text messaging services are provided under the custom made COEPSAT protocol. These are open to all and various HAM users across the globe can use these for communicating amongst themselves. The total capacity of message handling is 18 lakhs which is quite large to cater to the messaging services to various Ground Stations. The satellite also transmits the received signal strength and the error corrected information in the downlink which the Ground Stations can use to characterize their setup for digital communication. On successful technological demonstration of Passive Control System in Swayam, this project will serve as a perfect platform for future satellite missions with different innovative payloads.
In the college premises, on the roof of the Department of Metallurgy and Material Sciences, the team has established a class 10000 clean room, which houses all the facilities to test and integrate the satellite. The premises are as per ISRO Specifications. The team also has a functional Ground Station, with antennae for 435MHz band and 144MHz band communication and the associated Radio interface. The team has established a communication link with more than 30 different satellites, including the International Space Station. Globally, the frequency 437.025 MHz has been coordinated for Swayam. The team has published 10 highly acclaimed papers so far.
After numerous visits to ISRO Satellite Centre (ISAC), Bangalore, the team has fabricated, assembled and tested the Qualification Model (Proto-Flight Model) of Swayam, which has all the flight specific hardware. Most of the systems were designed, fabricated and assembled in-house. The software and hardware validation and stress testing is complete with the spacecraft being tested for end to end performance. The compatibility of Swayam Satellite with the ISRO Nano Satellite Launch System was checked and the satellite was subjected to the launch loads as per ISRO specifications. The Qual Model has also been subjected to environmental extremes to establish its survivability in Space Conditions. All systems are flight ready. The team has recently cleared the Critical Design Review (CDR) at ISAC, Bangalore and obtained a green signal for fabrication and launch of Flight Model of Swayam.
More information about the project at http://www.coep.org.in/csat/
The integration of the LX0OHB-4M amateur radio payload was completed on Sunday night, October 12 and is now ready to launch.
The onboard clock has been adjusted to start JT65B (145.980 MHz) at the UTC minute +/-1 second. It is likely to drift during the mission, and manual offset introduction will be required after a week or so. The launch date is October 23 at 1800 UTC.
The link budget is quite tight, but the first hours should give comfortable signals. QSB is to be expected.Beginning of transmission of 4M will start between 1917 UTC and 1927 UTC. Refer to the provided maps and animations links in the blog section (see also older messages) to determine your visibility. Alternatively, use the ‘tracking’ section where you can compute your tracking elements by introducing your geographic coordinates. The table can be copied/pasted into a text file. As the apparent movement will be close (and closer) to the one one of the Moon, manual pointing is easy but for the largest arrays. We’ll try to publish equivalent TLE’s to input in usual tracking software.
As JT65B is used: please remind those not yet too familiar with it that the receiver must not be tuned during the transmission. A dedicated webpage is being written to detail the procedure.A dedicated java application is also available to automatically transmit the decoded messages to the 4M website and ease the data collection. (Thanks to LSE Space). Alternatively, you can also send the decoded messages by eMail, sending the ALL.txt file.
For those not wishing to use JT65B, please record the signals (11025s/s, 8or 16 bits, mono), taking care not to saturate the recording and NO MP3 please.
SpectrumLab is an excellent choice, although some may wish to use simpler recording software.
You can imagine that the team is quite eager to receive the first reports, so, do not hesitate to mail immediately, send decoded messages or even phone or text me at +352 661 678 986.Our friends of IC CMalaga are also quite eager to receive the results of their radiation dosimeter experiment.
Basic rules of the contest have been delineated in the blog section. Complete rules will be published soon.
Ghislain Ruy LX2RG
Email: firstname.lastname@example.org with “4M Amateur” in the subject
Information animations and some JT65B test files at
Read the paper 4M Mission: a Lunar FlyBy experiment
EME 2014 slides: 4M, A Moon Flyby Mission
The November issue of Practical Wireless (PW) magazine, in the shops now, devotes three pages to the 4M amateur radio lunar payload which will transmit JT65B on 145.980 MHz. Beijing plan to launch the payload on October 23. The article, written by Colin Redwood G6MXL, is well worth reading.
PW magazine also carries the popular columns World of VHF by Tim Kirby G4VXE, Data Modes by Mike Richards G4WNC and Emerging Technology by Chris Lorek G4HCL.
It is understood that postal copies of Practical Wireless can be purchased using a Debit or Credit card by ringing +44 (0)1202 751611Monday – Thursday 8.30am – 4.00pm.
Practical Wireless magazine http://www.pwpublishing.ltd.uk/practical-wireless-latest-issue/
The 2014 AMSAT Symposium will be held Friday, Saturday, and Sunday, Oct 10-12 in Baltimore. The Annual Meeting will be held Saturday afternoon from 15:45 – 17:15 EDT (19:45z – 21:15z) and will be broadcast via EchoLink on the *AMSAT* channel. The Annual Meeting includes a report to the membership by the President and Senior Officers and includes a question and answer session where members may ask senior officers and BoD members questions. Echolink participants may send questions using the text messaging feature of EchoLink.
Some of Friday and Saturday’s Symposium presentations may also be available via EchoLink, as these will be used to test the EchoLink hardware, software, and Internet connection. See http://www.amsat.org for the Symposium schedule and the titles and times of the presentations.
If you haven’t used EchoLink before, you need to download the software and validate your license *NOW*. EchoLink use is restricted to licensed radio amateurs, because EchoLink is frequently used to remotely key amateur radio transmitters and repeaters. The validation process is used to prove that you are licensed. See http://www.echolink.org for more information. EchoLink software is available for free for Windows, Linux, OSX, iPhone, iPad, and Android. An Internet connection is required.
Once you’ve started EchoLink, search for the *AMSAT* channel (node #101377), select it, and “Connect”. The channel name includes asterisks (*) both before and after AMSAT.
[The above information was collected from amsat.org]