Blog (Page 31)

ISS MAI-75 SSTV activity planned for Aug 4-5

Artist’s impression of the docking of the Apollo and Soyuz spacecraft

It is planned Russian cosmonauts will transmit amateur radio Slow Scan Television (SSTV) images from the International Space Station (ISS) during August 4-5 on 145.800 MHz FM (likely using PD-120). It should be receivable across the British Isles and Europe.

On July 9, ESA Education had Tweeted:
“We are expecting the ISS to transmit pictures in the next weeks for the 45th anniversary of the Apollo-Soyuz test project. This is a perfect opportunity to try this activity for yourself!”
https://twitter.com/ESA__Education/status/1281140713237946370

Apollo–Soyuz was the first international space mission, carried out jointly by the United States and the Soviet Union in mid-July 1975.

ISS SSTV MAI-75 image 9/12 received by Chertsey Radio Club on Baofeng handheld

An announcement made July 27 on the ARISS SSTV Blog says:

The final crew schedule for the week of Aug 3-9 was released recently and it showed a MAI-75 activity scheduled for Aug 4 and 5. This is soon after the Space X Demo-2 undock so changes to that event could impact the schedule.

The current dates and times of the planned activity are as follows:
Aug 4 (12:25-18:10 UTC) is setup and day 1 operations.
Aug 5 (11:15-18:45 UTC) is day 2 operations and close out.

This is the Moscow Aviation Institute SSTV experiment that is active for orbital passes over Moscow, Russia. It has traditional been PD-180 or PD-120 and transmitting on 145.800 MHz.

Source ARISS STV Blog http://ariss-sstv.blogspot.com/

The ISS puts out a strong signal on 145.800 MHz FM and a 2m handheld with a 1/4 wave antenna will be enough to receive it. Many FM mobile and base station rigs can be switched been wide and narrow deviation FM filters. For best results you should select the filter for wider deviation FM (25 kHz channel spacing). Handhelds all seem to have a single wide filter fitted as standard.

The space agency ESA has released a video ‘How to get pictures from the International Space Station via Amateur Radio’ along with a collection of Tutorial videos explaining how to receive ISS Slow Scan TV (SSTV) pictures for different computers and mobile devices
https://amsat-uk.org/2020/07/08/esa-promote-amateur-radio-iss-sstv/

Read the Raspberry Pi article Pictures from space via ham radio
https://www.raspberrypi.org/magpi/pictures-from-space-via-ham-radio/

ISS SSTV info and links https://amsat-uk.org/beginners/iss-sstv/

What is Amateur Radio? http://www.essexham.co.uk/what-is-amateur-radio

Free UK amateur radio online training course https://www.essexham.co.uk/train/foundation-online/

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m5aka

AMSAT-UK

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Ofcom statement on 5725-5850 MHz

On Friday, July 24, Ofcom released their statement on 5725-5850 MHz and 5925-6425 MHz.

The main points are:
• Make 5925-6425 MHz available for Wi-Fi and other RLAN technologies
• The release of this spectrum will also enable very low power (VLP) outdoor use
• Remove the Dynamic Frequency Selection (DFS) requirements from channels used by Wi-Fi in the 5725-5850 MHz Amateur and Amateur Satellite Service allocation band

The Amateur Satellite Service weak-signal downlink band, 5830-5850 MHz, is used by amateur payloads on Deep-Space and Interplanetary spacecraft as well as by satellites in Low Earth Orbit (LEO). Increased use of Wi-Fi across these frequencies could obliterate the weak amateur satellite signals.

Ofcom statement
https://www.ofcom.org.uk/consultations-and-statements/category-2/improving-spectrum-access-for-wi-fi

In 2013 CEPT looked at increased use of 5725-5850 MHz
https://amsat-uk.org/2013/08/29/cept-considers-use-of-5830-5850-mhz-satellite-band/

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m5aka

AMSAT-UK

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AMSAT Partners with UMaine’s WiSe-Net Lab to Develop MESAT1 CubeSat

CubeSat in Space – Image Credit University of Maine WiSe-Lab

The University of Maine Wireless Sensing Laboratory (WiSe-Net Lab) and AMSAT have signed an agreement to collaborate on building and operating MESAT1, Maine’s first small satellite, to be launched in space in the next three years.

MESAT1 is Maine’s first CubeSat — one of 18 small research satellites selected by NASA to carry auxiliary payloads into space between 2021–23. It is part of NASA’s CubeSat Launch Initiative that provides opportunities for nanosatellite science and technology payloads built by universities, schools and nonprofit organizations to ride share on space launches.

UMaine’s WiSe-Net Lab, established in 2005, is involved in aerospace and space research. The lab was founded by Ali Abedi, KB1VJV, assistant vice president for research and director of the Center for Undergraduate Research. Lab researchers have developed the first wireless sensor network for NASA’s lunar habitation project and launched wireless leak-detection to the International Space station.

The MESAT1 initiative will enable K–12 students and teachers in Maine to access space data for educational and research purposes, and encourage students to pursue STEM careers.

AMSAT will provide a Linear Transponder Module (LTM) along with integration and operational support for MESAT1. AMSAT’s LTM incorporates a VHF/UHF telemetry beacon, command receiver, and linear transponder. It will be available for radio amateurs worldwide to use when the satellite is commissioned.

AMSAT President Clayton Coleman, W5PFG, celebrated the announcement.
“This is a great day for AMSAT and UMaine’s Wise-Net Lab. This partnership is a true win-win for both education and the amateur radio community. The collaborative effort under AMSAT’s engineering and operations teams has once again succeeded to bring another opportunity to AMSAT.”

[ANS thanks AMSAT and UMaine’s WiSe-Net Lab for the above information]

AMSAT News Service https://www.amsat.org/mailman/listinfo/ans

NASA selects Maine’s first small research satellite for launch in next three years
https://umaine.edu/news/blog/2020/02/24/nasa-selects-maines-first-small-research-satellite-for-launch-in-next-three-years/

Maine’s CubeSat research satellite mission
https://mainecampus.com/2020/03/maines-cubesat-research-satellite-mission-scheduled-for-launch-in-2021/

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m5aka

AMSAT-UK

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UWE-4 News: Successful first demonstration of orbit control on a 1U CubeSat

Altitude of UWE-4 since launch on December 27, 2018

The University Wuerzburg Experimental Satellite 4 (UWE-4) successfully used its propulsion system in order to conduct orbit control. The 1U CubeSat, developed and built at the Chair for Robotics and Telematics, is equipped with the electric propulsion system NanoFEEP which has been developed by TU Dresden.

Several manoeuvres have been performed within 11 days between June 23rd – July 3rd 2020 such that the altitude of the CubeSat was reduced by more than 100 m, compared to an average of 21 m with natural decay. This marks the first time in CubeSat history that a 1U CubeSat changed its orbit using an on-board propulsion system.

As chance would have it, the team of UWE-4 received a conjunction data message (CDM) in the morning of July 2nd 2020 from the United Air Force’s 18th Space Control Squadron. A conjunction of UWE-4 with a non-operational Iridium satellite (ID: 34147) in the morning of July 5th 2020 with a minimum range of about 800 m was a threat to the safety of UWE-4. An analysis has shown that the altitude of UWE-4 would already be below the Iridium satellite at the time of conjunction. Thus the on-going altitude lowering manoeuvre could only improve the situation and can be considered as a collision avoidance manoeuvre. No further CDMs have been issued regarding this possible conjunction. An analysis of the orbit of the two spacecraft after July 5th 2020 results in a closest approach of more than 6000 m.

Lowering the altitude of a spacecraft in low earth orbit (LEO) is equivalent to a reduction of its lifetime, since satellites in LEO usually burn up during re-entry due to the friction with the Earth’s atmosphere. Thus, this experiment is a concept demonstration of a de-orbiting manoeuvre shown at the smallest class of spacecraft in LEO. Today, there is no commitment to carry a propulsion system for spacecraft. However, due to the vastly increasing number of satellites in mega constellations such obligations are being discussed in the space agencies of several space faring countries. The experiment of UWE-4 presents a de-orbiting solution for the fraction of space debris of operational but unused satellites of today and for the mega constellations of tomorrow.

Stay tuned for more updates on UWE-4 and the upcoming launch of NetSat – a formation flying nano-satellite mission from our partner institute Center for Telematics which is expected to be launched September 2020!

Kind regards,

The UWE‑4 Team

UWE-4: First NanoFEEP thruster ignition
https://amsat-uk.org/2019/03/04/uwe-4-first-nanofeep-thruster-ignition/

UWE-4 435.600 MHz
http://www7.informatik.uni-wuerzburg.de/forschung/space-exploration/projects/uwe-4/

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m5aka

AMSAT-UK

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OSCAR Satellite QSO Party 1 Aug – 22 Sept

The objective of the AMSAT-UK OSCAR Satellite QSO Party is to encourage all radio amateurs around the world to get on the air and make contacts via satellites during northern hemisphere summer. We would like to attract both seasoned die-hard operators as well as all newcomers who are just getting involved.

While points are given per QSO this isn’t a contest, but we hope it will encourage people to get on the air and enjoy the excitement of making contacts through satellites.

The AMSAT-UK OSCAR Satellite QSO Party will be supported by an online leaderboard which will be available from the start of the event which runs from 00:00 GMT on 1st August until 23:59 GMT on 22nd September.

Prizes will be awarded to those from first to thirteenth place and are open to both AMSAT-UK and non-members around the world.
● First Place £250 Amazon Voucher
● Second Place £150 Amazon Voucher
● Third Place £50 Amazon Voucher
● Fourth to Thirteenth Place One Year AMSAT-UK Membership

Download the rules for the AMSAT-UK OSCAR QSO Party

Leaderboard https://leaderboard.amsat-uk.org/

Get The Details…

m5aka

AMSAT-UK

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