UK Radio Astronomy Association (UKRAA)

We have added to our bookshop the third edition of Dr Gerrit Verschuur's excellent book on the history and future of radio astronomy: 'The Invisible Universe - The Story of Radio Astronomy'.

The Invisible Universe

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The UK Radio Astronomy Association (UKRAA) is pleased to announce its appointment as a distributor of LabJack’s U3-HV multifunction data acquisition module.

LabJack U3-HV


This LabJack module is recognised by Radio-Sky Pipe II, the strip chart recorder and data logging software published by Jim Sky, which is widely used by amateur radio astronomers. To order the LabJack U3-HV and for more detailed information buy from our online store, or contact us at This email address is being protected from spambots. You need JavaScript enabled to view it..


December 2018 Alan Melia will retire from the Board of The UK Radio Astronomy Association (UKRAA). Alan was one of the founders of UKRAA and the Board would like to thank him for his energy, enthusiasm and the depth of technical expertise he has brought to our work over the last ten years.  We are pleased that Alan will continue to provide technical advice and support for the products he has helped to develop.

UKRAA are pleased to announce the appointment of three new Trustees to the Board of UKRAA.

Dave Hilton: I have a lifelong interest in astronomy and electronics I have been drawn to the fascinating field of radio astronomy and look forward to contributing to the work of the UKRAA.

John Thain: After spending  28 years in Primary Education with the majority of this time as a Deputy Headteacher and then moving to work at Stansted Airport  I am now retired and focusing on Photography and Astronomy.

Andrew Thomas: I have long standing interest in astronomy which was re-energised when I discovered amateur radio astronomy. Now I have a job!

UKRAA has several interesting new items of radio astronomy equipment in development and the introduction of new volunteers will allow us to push these projects forward to completion over the next twelve months.New volunteers are very welcome and we would be delighted to discuss our work with you. Our e-mail contact is This email address is being protected from spambots. You need JavaScript enabled to view it..

UKRAA Magnetometer PCB


The UKRAA Magnetometer is a sensitive instrument for measuring changes in the Earth's magnetic field. The unit was designed by John Cook and uses a Honeywell magneto-resistive IC as the sensor. The instrument is a 2-axis magnetometer measuring changes in the X&Z direction on one channel and the Y direction on the other channel. The unit is not intended for use in “compass” mode where actual field vectors are measured. It is intended for the board to mounted so that the face of the printed circuit board is normal to the local field. This mechanical geometric nulling allows a very high gain amplifier to be used resulting in an extremely sensitive instrument.

The unit exports its readings as a pair of voltages in the 0 to 5Volt range, and some form of recorder will be needed to store and display these. A number of external Analogue to Digital converters are available which may be employed for this purpose. The on board PIC controller also digitises the readings which are also made available via an industry standard I2C bus.

UKRAA also offers a micro-controller board and software to control the range setting and collect measurements from the Magnetometer via the I2C bus. Controller has sufficient on board RAM to store several days readings. The controller communicates with a PC via a serial link to download stored data for display and analysis using the Starbase program. Starbase is an open source multi-platform Observatory management program which is available free and a download facility is available on this site. The unit and the software is supported UKRAA and by B.A.A Radio Astronomy Group members.

Buy from our online store.

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