5 watt 2.4 GHz Amplifier Kit for QO-100 is Back in Stock

5 watt 2400 MHz Amplifier Kit

5 watt 2400 MHz Amplifier Kit

The AMSAT-UK shop has fresh stocks of the popular 5 watt 2.4 GHz amplifier kit for use with the QO-100 geostationary satellite. Update May 23: Unfortunately it is now Sold-Out.

The amplifier was designed by Kurt Moraw DJ0ABR and the kit was implemented by Arved Viehweger M0KDS.

The kit includes a single sided PCB on which is already mounted the PA transistor, there is a suitable heat sink on which to mount the PCB with the provided screws. All electronic components are included as are 2 SMA sockets. Assembly of the kits will require some surface mount components to be soldered to the PCB.

Note: It does not include a case for the unit and a separate 24 volt power supply will be required.

Kit details at https://shop.amsat-uk.org/QO-100_5W_Amplifier_Kit_designed_by_DJ0ABR_and_implemented_by_M0KDS/p3815740_20307881.aspx

Assembled PCB https://shop.amsat-uk.org/product/u-100ampassembled

QO-100 information https://amsat-uk.org/satellites/geo/eshail-2/

Sir Martin Sweeting G3YJO – Early years and favourite space missions

Sir Martin Sweeting G3YJO - Bold. Audacious. Game-changing.Radio amateur and Executive Chairman of SSTL, Sir Martin Sweeting G3YJO, has recorded a series of home videos from Coronavirus lockdown to record answers to the questions he is most frequently asked.

In this episode he talks about his inspiration for pioneering the original SmallSats revolution and reveals two of his favourite SSTL missions.

Watch Sir Martin Sweeting G3YJO – early years & favourite missions

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

Free UK amateur radio online training courses and FAQ that describes how to apply to take the Foundation exam online from your own home

AMSAT-UK https://amsat-uk.org/

Online Amateur Radio Satellite talk on Zoom

International Space Station - Image Credit NASA

International Space Station – Image Credit NASA

On Wednesday, May 13, at 1830 GMT (7:30pm BST) Robin Moseley G1MHU will give a talk on Zoom titled “Introduction to amateur satellites, meteor scatter, EME and ISS”.

The presentation is being organised by the Denby Dales Amateur Radio Society and being on Zoom it’ll be viewable on any Tablet or Smartphone with the Zoom App or from a Windows PC or Laptop.

The Zoom meeting ID is 278 609 9353 https://zoom.us/j/2786099353

A range of other talks are planned to be available on Zoom, they include:

Tuesday 5th May 7.30pm BST Martin Butler M1MRB of ICQ Podcast – Talk on the Future of radio clubs – which way forward ?

Wednesday 6th May 7.30pm BST Open club discussion on using a VNA

Wednesday 13th May 7.30pm BST Introduction to amateur satellites, meteor scatter, EME and ISS Robin Moseley G1MHU

Wednesday 20th May Don Field G3XTT Editor of Practical Wireless magazine

Denby Dales Amateur Radio Society http://www.DDARS.net/

Spring Issue of OSCAR News Available

Oscar News issue 229 March 2020 Front CoverE-members of AMSAT-UK can now download the March 2020 edition of OSCAR News, issue 229, here.

The paper edition edition is being sent to postal members and should arrive in the coming week.

In this issue:
• From the Secretary’s Keyboard
• QO-100 Wideband Transponder – 2020 Operating Guidelines and Bandplan
• AMSAT QO-100 NB Transponder Bandplan Update
• 5-watt 2.4 GHz amplifier kit for QO-100
• My experience with the AMSAT-UK 5W QO-100 Amplifier
• Review of the DJ0ABR 5W 2.4GHz Amplifier
• Under Development!
• AMSAT Files Comments Opposing Deletion of 3.4 GHz Band
• The eSatellite Award by eQSL
• Ad Astra!
• One Year of Operation for the Goonhilly WebSDRs for QO-100
• HuskySat-1
• How Phoenix went from a Paper Proposal to ASU’s First Student-Led CubeSat in Space
• The Qarman Cubesat
• The latest FUNcube Groundstation – in Antarctica
• From the Archives – An AMSAT-NA Symposium early this century

AMSAT-UK FUNcube Mission Patch

AMSAT-UK FUNcube Mission Patch

Membership of AMSAT-UK is open to anyone who has an interest in amateur radio satellites or space activities, including the International Space Station (ISS).

E-members of AMSAT-UK are able to download the quarterly publication OSCAR News as a convenient PDF that can be read on laptops, tablets or smartphones anytime, anyplace, anywhere. Join as an E-member at Electronic (PDF) E-membership

PDF sample copy of “Oscar News” here.

Join AMSAT-UK using PayPal, Debit or Credit card at

E-members can download their copies of OSCAR News here.

DOSAAF-85 (RS-44) amateur radio transponder activated

Artist impression of DOSAAF-85/RS-44 flying free but seems to be still attached to Breeze K/M rocket body

Artist impression of DOSAAF-85/RS-44 flying free but seems to be still attached to Breeze K/M rocket body

The amateur radio linear transponder (SSB/CW) payload on the Russian satellite DOSAAF-85 (RS-44) has been activated.

Dmitry Pashkov R4UAB reports:

DOSAAF-85 / RS-44 under construction

DOSAAF-85 / RS-44 under construction

DOSAAF-85 is a small scientific satellite created by specialists of the company Information Satellite Systems (ISS) Reshetnev and students of the Siberian State Aerospace University (SibSAU) Krasnoyarsk.

The satellite is named after the 85th anniversary of the Voluntary Society for the Assistance to the Army, Aviation and Navy, the organization responsible for the military training of Soviet youth.

The DOSAAF-85 satellite is designed to provide amateur radio communications, as well as to develop promising technologies. This is the third satellite that was created by specialists of ISS-Reshetnev and is based on the Yubileyniy platform, which features a hexagonal prism structure with body mounted solar cells.

DOSAAF-95 / RS-44 Antennas, 435 MHz top 145 MHz bottom

DOSAAF-95 / RS-44 Antennas, 435 MHz top 145 MHz bottom

The satellite was launched into orbit on December 26, 2019 from the Plesetsk Cosmodrome and is in an elliptical orbit with a perigee of 1175 km, an apogee of 1511 km and an inclination of 82.5 degrees.

Transmitter power: 5 watts
Beacon: 435.605 MHz – transmits CW call sign RS44

Inverting transponder:
Earth-to-Space: 145.965 MHz +/- 30 kHz
Space-to-Earth: 435.640 MHz +/- 30 kHz

Source Dmitry Pashkov R4UAB whose page also contains the satellite’s TLE, see

Peter 2M0SQL has added RS-44 to the AMSAT Live OSCAR Satellite Status Page at

Linear Satellite Frequency Summary https://www.amsat.org/linear-satellite-frequency-summary/

RS-44 Pass Prediction http://amsat.org.ar/pass?satx=rs-44

ARRL, AMSAT Seek Changes in FCC Orbital Debris Mitigation Proposals

FCC SealARRL Washington Counsel Dave Siddall, K3ZJ, and AMSAT Executive Vice President Paul Stoetzer, N8HM, on April 8, discussed with senior FCC International Bureau staff by telephone the FCC’s draft Report & Order (R&O) on mitigation of orbital debris (IB Docket No. 18-313). The amateur representatives told the FCC staff that “two aspects of the draft regulations are of particular concern…. and would seriously hinder amateur radio’s future operations in space, if adopted as proposed without the relatively minor changes that we propose.”

First, ARRL and AMSAT requested a revision to proposed language that otherwise would allow only private individual licensees to indemnify the U.S. for the operations of an amateur space satellite. ARRL and AMSAT requested that satellite owners be added to that provision. The amateur representatives, noting that amateur radio licensees may only be individuals under the amateur rules, stated that “[i]n no other service would an individual be required to personally make a similar indemnification” and that “it would be difficult to impossible to find an individual Amateur Radio licensee willing to bear that risk.”

Second, ARRL and AMSAT asked the FCC to delay by 3 years the proposed effective date of April 23, 2022, for a rule that would require satellite operators to certify that space stations “be designed with the maneuvering capabilities sufficient to perform collision avoidance” for spacecraft designed to operate above 400 kilometers in altitude. Citing the long lead times to design and construct Amateur satellites, ARRL and AMSAT suggested that a more reasonable date would be April 23, 2025 and noted that, based on recent past years, only an estimated 3-5 amateur satellites likely would be launched during the extra period.

“We do not disagree with the purpose of this requirement,” they told the FCC staff, but “the proposed effective date is unreasonable in the case of amateur radio satellites.” The new effective date “would allow time for amateur spacecraft designers to adapt to this new requirement,” they said.

Citing the value of amateur satellites to the development of the commercial small satellite industry, and student participation in such projects, ARRL and AMSAT said a strong and robust Amateur Satellite Service will help inspire future developments in satellite technology. The requested changes to the draft R&O would help ensure that amateur radio continues to have a future in space and contribute to the public interest on an educational, non-pecuniary basis.

The FCC is expected to consider the R&O at its April 23 open meeting.
The AMSAT/ARRL document may be read in full at

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