Author Archives: Martin Atherton

CUWS Talk – Feb 14th 1900 – GNU Radio: A toolkit for the Wireless World

The talk will be from 1900 in the Bateman Auditorium at Caius College on Thursday Feb 14th. All are welcome.

Speaker:
Derek Kozel is an officer in the GNU Radio project, president of the Cardiff University Amateur Radio society, and a PhD researcher at the Centre for High Frequency Engineering. He operates as MW0LNA primarily on the microwave bands and has a strong interest in Free and Open Source Software and enabling the use and understanding of wireless digital communications by students and in Amateur Radio.

Description:
The way we send information, whether voice, text, images, or video, has been evolving since Samuel Morse’s telegraph in 1836. As these systems become more advanced the standard electronics tools and knowledge which have been the Amateur Radio operator’s standard toolkit must be accompanied by software components. Together the analog, digital, and software are used to enable the modern communications modes such as Digital Video Broadcast (DVB), JT65 for moonbounce, FreeDV which has brought digital voice to the HF bands, and the wide variety of other new and exciting protocols.
GNU Radio (www.gnuradio.org) is a free, graphical, software development toolkit that provides signal processing blocks to implement software-defined radios and signal-processing systems. It can be used with external RF hardware to create software-defined radios, or without hardware in a simulation environment. This talk introduces the software, demonstrates assembling complete transmit and receive systems, and shows a few examples of advanced applications.

CQWW SSB 2018

(UPDATE – Based on claimed raw scores we are 1st in the U.K. in the Multi-Single category.)

A team of operators manned Woop Woop 3 for the CQWW SSB Contest over the weekend of October 27/28. 2443 contacts were made for a claimed score of just over 2.3M points in the Multi-Single category. The 40m 4-square antenna and the 80m vertical will probably be left up for members to use over the winter.

The antennas are shown below: 80m vertical, 40m 4-square, 5 element 15m Yagi on 40ft SCAM, and regular 3 ele SteppIR in distance.

Life Member Rob, G3YZO, operated and brought along this picture of the original Woop Woop building in Grange Road which the club vacated in 1970. It was an ionospheric research lab before it was taken over by CUWS. Note that it wasn’t the first club shack – that was in the Old Cavendish in town.

CUWS Uses G6XX during the World Cup – June 2018

CUWS used the special RSGB Contest Club callsign G6XX on a couple of days during the football World Cup Championship in June. Ops included G3ZAY, M0WUT, M0ZCJ, G7VJR, M/KD2LXA, 2E0FFC, 2E0XSM, M0VFC, M0WJE, M0BLF, and M1BXF. Around 1500 contacts were made with up to 3 stations QRV simultaneously.

Dom, M/KD2LXA operating as G6XX.

Rob, M0VFC with the third operating position (K3 + Juma amp) on 18MHz.

Charlie M0ZCJ on 14MHz.

Sean 2E0XSM using G6XX

David 2E0FFC using G6XX

The event finished with the annual CUWS BBQ.