CAS-4A and CAS-4B Launch Expected – Frequencies Coordinated

XW-2A satellite launched September 19, 2015

XW-2A satellite was launched September 19, 2015

CAMSAT has worked closely with a Beijing Government aerospace contractor to build two satellites with amateur radio linear transponder payloads. IARU record a launch had been planned for March 31, 2017 from Taiyuan into a 524 km orbit with an inclination of 42 degrees.

Both will carry a 435/145 (U/V) 20 dBm (100 milliwatt) SSB/CW linear transponder, a 2m CW 17 dBm (50 mW) telemetry beacon and an AX.25 4.8 kbps GMSK 20 dBm (100 mW) telemetry downlink.

The two micro-satellites will also carry optical remote sensing missions. Planned to be 494x499x630 mm dimension regular square shape and approximately 50 kg mass with three-axis stabilization system.

These frequencies have been coordinated by the IARU Satellite Frequency Coordination Panel:

• Linear transponder downlink 145.870 MHz, emission designator 20K0V8WWF, output power 20 dBm
• Linear transponder uplink 435.220 MHz
• CW telemetry beacon 145.855 MHz, emission designator 100HA1AAN, output power 17 dBm
• GMSK telemetry 145.835 MHz, emission designator 16K0F1DCN, output power 20 dBm

• Linear transponder downlink 145.925 MHz, emission designator 20K0V8WWF, output power 20 dBm
• Linear transponder uplink 435.280 MHz
• CW telemetry beacon 145.910 MHz, emission designator 100HA1AAN, output power 17 dBm
• GMSK telemetry 145.890 MHz, emission designator 16K0F1DCN, output power 20 dBm

IARU Satellite Frequency Coordination pages

Ham radio satellite activation of Berry Islands, Bahamas

Caribbean IslandSteve M1ACB, Rob M0VFC and John M0IDA will be active on the FM and SSB amateur radio satellites from Berry Islands in the Bahamas.

The trio plan to operate from March 4-10 and will be using hand-held antennas. Since the FM satellites will only cover part of the USA they’ll also be using SSB on FO-29 to reach the British Isles and Europe.

They will be operating from Little Harbour Cay in the Berry Islands, IOTA NA-054, Grid Square FL15do.

For further information see

Check Twitter for updates: @rmc47 (M0VFC), @ItinerantHam (M0IDA) and @m1acb

International Space Colloquium – First Call for Speakers

FUNcube-1 flight model - Image credit Wouter Weggelaar PA3WEG

AO-73 (FUNcube-1) – Image credit Wouter Weggelaar PA3WEG

This is the first call for speakers for the AMSAT-UK International Space Colloquium 2017 which will be held on Saturday and Sunday, October 14-15 at the Kents Hill Park Conference Centre, Timbold Drive, Milton Keynes, MK7 6BZ, United Kingdom.

AMSAT-UK invites speakers, to cover topics about Amateur satellites, CubeSats, Nanosats, Space. High Altitude Balloons and associated activities, for this event.

Those wishing to participate should contact Dave, G4DPZ, dave at g4dpz dot me dot uk

Further information

73 Dave G4DPZ


AMSAT-UK Colloquium 2008-2012 Videos

Steve Hartley G0FUW presents the Louis Varney Cup to Wouter Weggelaar PA3WEG - Credit Mike Rupprecht DK3WN

Steve Hartley G0FUW presents the Louis Varney Cup to Wouter Weggelaar PA3WEG 2016 – Credit Mike Rupprecht DK3WN

Wouter Weggelaar PA3WEG has retrieved videos of talks given at AMSAT-UK Colloquium 2008-2012 and made them available on YouTube.

The videos were made by members of the British Amateur Television Club (BATC) and stored on the club’s streaming site. Dedicated BATC members have carried out the world-wide streaming and recording of the  AMSAT-UK International Space Colloquium since 2007.

Due to lack of source information the descriptions and titles of the videos are not as informative as they should be. Have a search through them and share links with others on Twitter and Facebook.

Watch the videos at

Colloquium schedules giving speakers names and presentation titles for 2009-2012 are available on the bottom of this page

2017 AMSAT-UK International Space Colloquium

Kents Hill Park Conference Centre Milton Keynes MK7 6BZ

Kents Hill Park Conference Centre, Milton Keynes, MK7 6BZ

AMSAT-UK is very happy to announce that the dates of the next AMSAT-UK Colloquium will be October 14-15, 2017.

This year it will be incorporated into the RSGB Convention at the Kents Hill Park Conference Centre, Timbold Drive, Milton Keynes, MK7 6BZ. Exact details are currently being finalised with the RSGB and these will be notified when they are known.

If you have not been to Kents Hill Park before, it is very close to the M1 motorway and is near to Bletchley Park, where RSGB members have free entry. For overseas visitors it is convenient for planes to London Luton Airport (30-minute taxi ride) and also London Gatwick and Birmingham airports, both of which have direct train connections to Bletchley and/or Milton Keynes stations. These stations are approximately 10 minutes away by taxi.

Colloquium page:

Travel Information


Small Satellite SDR Paper

Mamatha R. Maheshwarappa 2E0CZOMamatha R. Maheshwarappa 2E0CZO has released her paper “Improvements in CPU & FPGA Performance for Small Satellite SDR Applications”.

Abstract: The ongoing evolution in constellation/formation of CubeSats along with steadily increasing number of satellites deployed in Lower Earth Orbit (LEO), demands a generic reconfigurable multimode communication platforms. As the number of satellites increase, the existing protocols combined with the trend to build one control station per CubeSat become a bottle neck for existing communication methods to support data volumes from these spacecraft at any given time.

This paper explores the Software Defined Radio (SDR) architecture for the purposes of supporting multiple-signals from multiple-satellites, deploying mobile and/or distributed ground station nodes to increase the access time of the spacecraft and enabling a future SDR for Distributed Satellite Systems (DSS).

Performance results of differing software transceiver blocks and the decoding success rates are analysed for varied symbol rates over different cores to inform on bottlenecks for Field Programmable Gate Array (FPGA) acceleration. Further, an embedded system architecture is proposed based on these results favouring the ground station which supports the transition from single satellite communication to multi-satellite communications.

You can download the PDF of the paper from

Mamatha worked on the STUDSAT-1, STUDSAT-2 and STRaND-1 satellites which carried amateur radio payloads and was Satellite Officer & Member of the Surrey Electronics and Amateur Radio Society