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Welcome to Crawley Amateur Radio Club

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The Crawley Amateur Radio Club (CARC) was formed over 40 years ago and moved into its present premises Hut 18 Tilgate Forest Recreational Centre, in the early 90’s. We are an affiliated club of the RSGB. Membership, currently standing at around 55, ranges from a member in their twenties to several octogenarians. The monthly talks and presentations cater for a diversity of technical backgrounds from absolute beginners to well-qualified professional engineers. Members of note include a past President of the RSGB the late John Graham G3TR, and the late Ron Vaughan G3FRV (now VK6RV), General Manager of the RSGB in the late 60’s. Current members include Stewart Bryant, G3YSX (past President of the RSGB, and currently RSGB Chair), Caspar Pierce (Winner of the RSGB Kenwood trophy), and Eugene Sully G0VIO of Big Brother fame who does much to actively promote interest in radio communications and the Sciences in general. Facilities at the spacious Clubhouse include: A contest-grade radio station...
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New Android SDR Receiver

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SwR is a new app for Android (no iPhone version - sorry) which lets you easily listen to KiwiSDR and Web-888 publicly available SDR receivers. The app is completely free and contains no adverts. listening to public SDRs can be really useful if you are operating SSB and want to easily check if your are reaching your target location. We tested it, and it seems to work flawlessly. The user interface is very modern too. Features include: • Connect to any public receiver • Live spectrum and scrolling waterfall display • Drag the spectrum to tune; drag the waterfall to pan the band • Nixie-tube style frequency display with per-digit tuning • AM, LSB, USB, CW and FM demodulation • Zoom from the full band down to a narrow window • World map of receivers — tap one to start listening • Volume and mute controls https://play.google.com/store/apps/details?id=com.kruen.swr&hl=en
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M0CVO Off Centre Fed Dipole HW-20HP Review

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 This is a review for HW-20HP Off Centre Fed Dipole from M0CV0 Antennas. After reading the excellent review (way back in the January 2012 edition of Radcom) from the RSGB propagation guru, Steve Nichols (G0KYA), I thought I would give it a go. The antenna is apparently designed to operate on the 20, 15, 12, 11 & 10m bands without an ATU, and the 17 and 6m bands with an ATU. The antenna was set-up at the end of my garden in Felbridge, East Grinstead.  It's semi-rural with a reasonably low noise floor. The lengths of the arms are 7m and 3.5m. It's specified at 400W CW and 500W PEP. A warning is given to reduce the power when using constant carrier data modes. I mounted mine on a Spiderbeam 12HD pole at around 9M above ground and in an inverted V configuration.  The ends were around 5m above ground.  My selection of reusable cable ties (surely the best invention ever!) came in very handy for mounting the balun onto the pole. The radio was an ICOM-705 running off it'...
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Gatwick Aviation Museum Special Event

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On Sunday 21st June 2026 we celebrated Museums on the Air with a visit to Gatwick Aviation Museum . Our Chairman (Mike G0KAD) brought along his Racal military mast, and club members learned how to erect this beast! Attached to the mast was a sloping EFHW antenna. The main radio in use throughout the day was a Yaesu FT-450D, but club members brought along a vast array of other transceivers and antennas to experiment with.  It was fantastic to see some of our younger members join us for the day, and it was great to enjoy the sunshine and chat about amaetur radio all day. During the morning HF conditions were poor, but by early afternoon we were starting to get quite a pile-up!  We had QSOs with over 50 stations all over Europe. Huge thanks to the volunteers from Gatwick Aviation Museum for hosting us for the day, and providing the marquee, tables and power for us.
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International Museums on the Air 2026

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On Sunday 21 June Crawley Amateur Radio Club will be taking part in a special event called 'International Museums on the Air'. Radio clubs from around the world take part with the purpose of encouraging the spirit of Amateur Radio in communicating with others around the world, and  also to attract visitors to the many different wonderful museums that are to be found both in this country and overseas. This year we will be operating from the spectacular Gatwick Aviation Museum, with their unique collection of iconic aircraft and engines from the golden age of British aircraft manufacturing. We will be operating from around 1030 until 1500. Crawley Amateur Radio Club has been running for over 50 years, and members of the club will be operating radios, demonstrating equipment, and be available to talk to visitors about the hobby. Find out more about the museum here
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FPGA Presentation Notes

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For our May 2026 monthly presentation we were given a talk on FPGAs by Zander M1YAP.  For those unable to attend the presentation we used Claude AI to make the following notes: Zander M1YAP recently presented an introduction to Field-Programmable Gate Arrays (FPGAs) and VHDL to our club, demystifying these reconfigurable digital devices with clear explanations and liv demonstrations on a Xilinx Spartan 701 evaluation board. The presentation began by explaining where FPGAs fit in the landscape of custom logic devices. FPGAs can be reprogrammed on the fly. This makes them ideal for prototyping, education, and applications where flexibility matters more than squeezing every bit of efficiency. Zander then covered the fundamental building blocks of an FPGA: lookup tables (LUTs) and flip-flops arranged into configurable logic blocks, all connected by a programmable routing fabric. He explained how these simple elements combine to implement any digital circuit. Highlighted dedicated ...
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Mills on the Air 2026

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On Sunday 10th May members of Crawley Amateur Radio Club headed off to Ifield Water Mill to take part in the annual Mills on the Air event. We used an inverted V dipole for the 40m band. Initially we used a Hermes Lite 2 and 150w amplifier, later on in the day we used a Yaesu FT-710. In previous years we had needed our sun cream, but this year we were not so fortunate, and were very grateful for the gazebo that club member Charlie provided.  Propagation conditions were poor, but we managed over 50 QSOs across England, and most of Western Europe. We were lucky enough to have QSOs with 10 other clubs taking part in the event. GB2NW - Nutley Windmill, East Sussex GB6GEM - Gainsford End Tower Windmill, Essex GB0CWM - Cogglesford Watermill, Lincolnshire GB6CW - Cromer Windmill, Norfolk GB0BW - Bourn Windmill, Cambridgeshire GB1HCM - Heron Corn Mill, Morecambe GB5HW - Heage Windmill, Derbyshire GB5WEM - Wind Energy Museum & Thurne Mill GB6HWM - Herne Windmill, East Kent GB2RRS -...
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Flashing NanoVNA with updated firmware

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  Club member Ted (G7OBF), explains the process of updating the NanoVNA. I have never flashed any thing before so was worried about breaking the VNA. I succeeded, and here are the resources and my approach I used. Apparently the main STM program “STM32Cubeprg” will flash from a .bin file but this requires you to entered the start address and that was beyond me, whilst the .dfl file has all the info needed. I chose the .dfu file method The RSGB NanoVNA book outlines the procedure and I found this Wiki more helpful as it has added details https://groups.io/g/nanovna-users/wiki The best YouTube video I found was https://www.youtube.com/watch?v=NcXzITPPTyA Use your browser to download “DFuSE Demo” tool. I choose an English language site as some of the info on the developers site is in Chinese! My Windows failed to select the correct driver for this program, its in file called sttube.inf. To install the driver follow this link for instructions https://groups.io/g/nanovna-users/files/Mis...
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