Simple dual band dish feed for Es’hail-2 / QO-100

DKARS April 2019 front coverThe April 2019 issue of the free DKARS magazine features an article in English – Simple dual band dish feed for Es’hail-2 / QO-100 by Mike Willis G0MJW, Remco den Besten PA3FYM and Paul Marsh M0EYT.

Their article, on pages 18-23, describes an easy to build 2.4 and 10 GHz dish feed, using commonly available materials, for Es’hail-2 / QO-100 deployment. The feed consists of a LHCP patch antenna for 2.4 GHz and a waveguide feed for 10 GHz, to be placed in the focal point of commonly available and cheap offset satellite TV dishes with f/D’s of around 0.6

Download the full magazine PDF from https://dkars.us13.list-manage.com/track/click?u=2a0602da7add78cfc4cee370d&id=f8424212ae&e=ca64a74f86

Dutch Kingdom Amateur Radio Society (DKARS) http://www.dkars.nl/index.php?page=magazine_uk

Additional information on Es’hail-2 /QO-100 can be found at
https://amsat-uk.org/2019/02/10/qatar-oscar-100-web-receiver-now-live/

SatNOGS satellite ground station article in HackSpace magazine

HackSpace magazine issue 18 front coverThe May edition of HackSpace magazine, issue 18, featuring articles by radio amateur Jo Hinchliffe MW6CYK is available as a free PDF.

On pages 34-47 is his special feature on Space, which explains how you can build a SatNOGS satellite ground station to receive amateur radio satellites.

Jo’s article Make a Slim Jim Antenna appears on pages 110-111.

Also in the magazine, on pages 96-99, Ben Everard explains how to build an ISS count‑down timer.

You can download the free HackSpace magazine PDF from
https://hackspace.raspberrypi.org/issues/18

Direct link to the PDF
https://magazines-static.raspberrypi.org/issues/full_pdfs/000/000/072/original/HackSpaceMag18.pdf

Jo Hinchliffe MW6CYK
https://twitter.com/concreted0g
https://concretedog.blogspot.com/

FUNcube Data Warehouse URL Change

Dave G4DPZ reports on a change to the URL used by the AMSAT-UK Data Warehouse for the FUNcube amateur radio satellites.

As part of the migration of the data warehouse to the new server, we are now redirecting all dashboard data submissions to: http://data.amsat-uk.org/
(there is no need to change your dashboard settings)
Hence, all information at http://warehouse.funcube.org/ will no longer be updated.

I will be merging the scores at http://data.amsat-uk.org/ranking
(I am at the top of the list because of data migration)

You can search for your site name or order the columns by clicking on the column header.

There have been requests for the existing style of ranking, including age colour, for each satellite. I will be implementing this in the next couple of days.

Hope you like the new site and and feedback will be welcome.

73 Dave, G4DPZ
g4dpz<at>funcube.org.uk

ISS SSTV at Music is Magic in Space Rehearsal

Music is Magic in Space

Music is Magic in Space

The International Space Station SSTV transmissions were received during rehearsals for the Music is Magic in Space performance that will take place at the Royal Albert Hall on Monday, April 15.

ISS SSTV image 5 received by Dave Boult G7HCE in Exeter on April 14, 2019

ISS SSTV image 5 received by Dave Boult G7HCE in Exeter on April 14, 2019

Russian cosmonauts on the ISS transmitted amateur radio SSTV on 145.800 MHz FM from April 11-14.

On Sunday, April 14, radio amateur Laura M6LHT was involved in Music Man Project UK rehearsal of Music is Magic in Space in preparation for their appearance at the Royal Albert Hall on Monday, April 15. During the rehearsal the ISS came overhead and Laura M6LHT took the opportunity to receive the SSTV pictures. She tweeted: “We are singing to space, & space is singing back!”
https://twitter.com/lhtrevail/status/1117405107564482560
https://twitter.com/lhtrevail/status/1117453101387198464

Details on the unique charity concert featuring hundreds of musicians with a learning disability from across the country at
https://www.royalalberthall.com/tickets/events/2019/music-is-magic/

Music Man Project UK
https://themusicmanproject.com/
https://twitter.com/MusicManProject

Article: Pictures from Space via Ham Radio by M6DNT page 62 Magpi magazine issue 80
https://www.raspberrypi.org/magpi/issues/80/

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

ISS SSTV Success

Rajkot students see ISS SSTV - credit Divyabhaskar

Rajkot students see ISS SSTV demonstration – credit Divyabhaskar

50 students in Rajkot, India enjoyed a live demonstration of Slow Scan Television (SSTV) from the International Space Station during a visible pass of the ISS.

Russian cosmonauts on the ISS transmitted amateur radio SSTV on 145.800 MHz FM from April 11-14.

SSTV Demonstration at Rajkot April 12, 2019

ISS SSTV Demonstration at Rajkot on April 12, 2019

AMSAT-INDIA Regional Coordinator West India Zone Rajesh Vagadia VU2EXP reports:

To spread awareness of Amateur Radio, Satellites & ARISS activities in the region we conducted interesting event recently.

On April 12, 2019 we openly invited students & citizen of Rajkot – Gujarat to be present & witness SSTV Live Demonstration, that too during Visible pass of ISS from terrace of my home.

More than 50 students & citizens assembled to my QTH by 18:30 IST (13:00z). We gave printed ISS tracking chart/ISS crew details to all of them, and explained how to use chart.

Myself Rajesh Vagadia VU2EXP gave brief talk on Amateur Radio, ISS, OSCAR Satellites, Life of Astronauts, ARISS SSTV event, Student Outreach Program etc for one hour. Small display of radio stuff were also kept. Everybody get excited to learn such new things (for them) happening in Ham Radio world.

ISS SSTV image 10 received by Rajesh VU2EXP

ISS SSTV image 10 received by Rajesh VU2EXP

Good Visible ISS Pass of -3.0 magnitude with elevation of 36° was targeted for Live Demo, calculated for my Grid ML52jh.

With my 3 ele Yagi, VHF HT & recording device we started to track ISS at 19:27 IST (13:57z). Within a minute ISS started to appear from NNW direction moving towards SE. Students were requested to control their excitement & to keep silence as we were also recording audio. Soon sstv signal also get heard on 145.800 MHz. SSTV signal for two images were received & recorded.

It was exciting experience for all to sighting ISS at the same time getting signals from it, felt like having handshake with ISS crew! After pass, we amplified weak audio in Audacity & decoded two images (though bit noisy) with MMSSTV. Decoded Images were shared with all students as souvenir. It proved great learning experience for all. Had lots of Q&A till late and enjoyed light refreshments at end of the program.

ISS SSTV demonstration by Rajesh VU2EXP

ISS SSTV demonstration by Rajesh VU2EXP

As everything was arranged at our home I need to thanks my XYL Kiran, harmonic Snehal VU3WHO, brother Prakash VU3PLJ & nephew Priyesh VU3GLY for extending helping hands.

Btw, leading newspaper Divyabhakshar supported this radio experiment & published good articles (though in regional language Gujarati), see
http://tinyurl.com/iss-sstv-demo-news

I am thankful to all hams and members of ARISS, AMSAT, ISS Crew, Space agencies, SSTV Award Manager etc involved in such a wonderful educational event offered to the world!

Article: Pictures from Space via Ham Radio by M6DNT page 62 Magpi magazine issue 80
https://www.raspberrypi.org/magpi/issues/80/

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

Australian CubeSat to use 76 GHz

The IARU Satellite Coordination Panel has announced the amateur radio frequencies for the Australian 76 GHz CubeSat CUAVA-1 that is expected to launch in July 2019.

CUAVA-1 is a 3U CubeSat and the first CubeSat project of the new ARC Training Centre for CubeSats, Uncrewed Aerial Vehicles (UAVs), and their Applications (CUAVA), whose primary aim is the education and training of people, mostly PhD students, for the space sector.

With significant heritage from the QB50 CubeSat INSPIRE-2, CUAVA-1 is a 3U CubeSat that will link with the international radio amateur community for outreach, training, and increased data downloads, observe the Earth with a novel multi-spectral imager, use a GPS instrument to explore radio occultation and the reception of GPS signals scattered off the Earth as well as provide a backup determination of the CubeSat location, investigate plasma environment and associated space weather with radiation detectors, and explore the performance of a new communications payload.

This mission addresses issues of radio technique interesting to the radio amateur community in the following ways:

1) Global Radio Amateur Participation in Mission and Data Downlinking We will work with radio amateurs and other groups to receive and decode the spacecraft beacon and downlinked data, with subsequent transfer to the internet database (ideally the SatNOGS database).

In detail, the CubeSat will transmit data, especially recent images over the terrestrial footprint, to participating radio amateurs across the globe. This will directly involve radio amateurs in the mission and its success, by greatly increasing the overall amount of downlinked data available and having the images be directly relevant to the receiving people. The receiving station and people would be identified in the database and then acknowledged in any publications resulting. The mission’s success will thus be directly tied to the involvement of the international radio amateur community.

In addition, the mission should provide multiple opportunities for enhanced outreach and training for both the global amateur radio satellite communities and CUAVA.

2) Student and Radio Amateur Participation in the Groundstation We will train students and desiring radio amateurs in the setup and use of a groundstation hosted by the University of Sydney and then have these people operate the groundstation (including control of the satellite and managing the uplink and downlink) and transfer downlinked data into an internet database (ideally the SatNOGS database).

This will involve existing radio clubs in the training, increasing their memberships and leading to new clubs and people familiar with the international radio amateur and satellite communities.

3) Radio Wave Propagation The ionosphere, thermosphere, and lower atmosphere have multiple effects on the propagation and absorption of radio waves and microwaves.

This mission will study the electron number density as a function of position, time of day, and space weather events using the “radio occultation’’ of GPS signals and their associated refraction and attenuation. These data will be published and made available for ionospheric research via a website, and provided to Australia’s Bureau of Meteorology and other space weather organisations worldwide. These data are used to predict maximum and minimum usable frequencies for radio amateurs (and both commercial and government users).

In addition, the GPS signal attenuation and electron number density profiles can be used to extract the amount of water as a function of height and used to predict ordinary weather. This work will also add to knowledge of the orbital environment via the drag forces and decay of satellites depending on the gas and plasma densities.

4) Communication Protocols Modulation techniques that will be investigated for the high-speed communications experiment include QPSK, 16-QAM and CPFM. If successful, this technology for wavelengths below 10 cm will increase the data transfer rates by at least 4 orders of magnitude while also decreasing the sizes of antennas and the associated spacecraft.

This experiment will be relevant to spacecraft-toground and inter-spacecraft communication links and is particularly relevant to radio amateurs, universities, and their students and staff, due to the dramatic increases in data rates and capabilities and associated dramatic reductions in costs.

In addition, the use of multiple frequencies is important for rain (and moisture content) attenuation mitigation techniques, as well as to provide another data stream for weather prediction.

5) Radiation Effects on Electronic Components The Low Earth Orbit (LEO) environment is protected from cosmic rays, solar particles, and particles trapped in the Van Allen Belts by Earth’s magnetic field.

Some portions of LEO do harbour regions of enhanced radiation, in the auroral zones and the South Atlantic Anomaly (SAA) for example. In addition, transient solar and magnetospheric particle energization events, a major component of space weather, can change the radiation level by orders of magnitude. This radiation can adversely affect spacecraft which pass through them.

This mission will directly measure the counts of energetic particles as a function of space weather activity, position, and time of day, thereby characterising the Earth’s radiation environment. It will also study the effects of the radiation on the computer and other onboard electronics. Examples of effects include single event upsets (SEUs), degraded solar cells, and non-functioning electronics such as radio receivers and transmitters.

6) Attitude and Position Determination Reception and analysis of GPS signals by the onboard GPS receiver will determine the spacecraft’s attitude and location as a function of time, thereby determining the satellite’s orbit.

Comparisons with NORAD radar-derived orbits will test the on-board GPS receiver and measure drag and other effects. These orbits are vital for radio amateurs interested in testing and characterising their radio equipment, as well as in downloading the satellite beacon and data signals for transmission via the web to the satellite project and the international community.

Proposing to downlink telemetry on 9k6 GMSK AX25 on UHF and high speed downlinks on 2.4 GHz, 5.6 GHz and 76 GHz. Planning a launch from Japan in July 2019 into a 400 km orbit.

These frequencies have been coordinated by the IARU:
Downlinks: 437.075 MHz, 2404.000 MHz, 5840 MHz and 76.800 GHz
Uplinks: 145.875 MHz, 2404.000 MHz and 5660.000 MHz

More information on CUAVA-1 can be found at
https://www.cuava.com.au/
https://twitter.com/Arc_Cuava

IARU Satellite Frequency Coordination pages http://www.amsat.org.uk/iaru/