Chelmsford Amateur Radio Society

CARS Meetings April - June 2019

Award for All

April Meeting
Tue 2-Apr-2019, 7.30-10pm
Oaklands Museum, Moulsham Street
"A Canal Journey"
Vic Rogers G6BHE

For the April meeting we had a double feature. For the main session before the break Vic Rogers G6BHE recounted his hard work and experiences on ‘A Canal Journey’ up the Grand Union Canal. This entailed travelling from Harefield to Leicester - 118 miles, 128 locks, 8 swing bridges and 4 tunnels, single handed in 7 days! For anyone who has been on a canal – all those locks etc can be quite an effort!

Vic's boat and giving the talk

After the break, the raffle was drawn and there was a short Q&A ‘Brains Trust’ session, with questions including the latest position on plans for IMD. Our thanks to Vic who is also the South Essex District Rep for RSGB. So whether it’s boating or radio – he is always pleased to hear enquiries!

Vic gettting his speakers mug from Colin G0TRM

May Meeting
Tue 7-May-2019, 7.30-10pm
Oaklands Museum, Moulsham Street
Broadcast TV Development
Andy Fremont

For May, we are pleased to host Andy Fremont who is involved with the TV collection at Sandford Mill and will take us on a brief tour of Broadcast TV development.

He will start with the 'Nipkow disc' used by Logie Baird for his mechanically scanned system, which by 1948 had been overtaken by the Image Orthicon camera tube and the Marconi-EMI system.

The Orthicon saw us through to the start of the 60’s when the Plumbicon appeared, so a little about that and then we are ready for colour! Marconi also did other broadcast equipment inc the B3410 telecine, which lasted until Digital started to appear.

Andy explaining how the orthicon became the key tube for many cameras

Andy's background in Marconi Comms Broadcast Division provided for a highly informative talk on some of the key developments

Some of the earlier Marconi camera models with rotating turret lenses

The Mk5 Camera - transistorised with zoom lens - and the Marconi Telecine at Sandford Mill

Andy receiving his speakers mug from Elliot 2E0JSE, CARS Chair (Photo by Colin G0TRM)

June Meeting
Tue 4-Jun-2019, 7.30-10pm
Oaklands Museum, Moulsham Street
Beam Building
Dave Cutts M0TAZ

Dave Cutts M0TAZ who gave us the Datamodes talk, returns to CARS for sommthing different - DIY Antennas

Dave will give a presentation and demo on Beam Building. His larger HF beams may not fit in the room though!

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