Chelmsford Amateur Radio Society
G0MWT, GX0MWT, GB5HF, GB5SM, GB100MWT, G100RSGB & GB95-2MT

CARS Meetings April - June 2018


Award for All

4th April 2018

Added April photos


April Meeting
Tue 3-Apr-2018, 7.30-10pm
Oaklands Museum, Moulsham Street
"FreeDV - Digital Voice for HF
and other low SNR channels"

Matthew Phillips G6WPJ

A digital alternative to SSB on HF?

Since the beginning of 2017 the RSGB News (GB2RS) has been broadcast on 80m (~3.64 MHz) using FreeDV, an experimental digital mode intended to perform better than SSB voice in difficult radio environments.

Nearly 50 including several visitors were present for Matthews talk on FreeDV; what is it, how and why is it being developed by a worldwide community of radio amateurs and how amateurs can try it for themselves.

 
FreeDV Spectrum plot was part of the background info presented to a keen audience

 
OFDM principles and a screenshot of the FreeDV software

More to come...

Following the break Peter ran the raffle, and our speaker got his mug. Peter also gave a brief chat on antenna planning permission issues which is expected to lead to a fuller talk in due course.

 
Matthew receiving his Speakers Mug from Tony - and Peter drawing the raffle (Photos by John G8DET)

Useful Links:-

  • FreeDV - inc software download
  • Codec2 - inc audio samples



    May Meeting
    Tue 1-May-2018, 7.30-10pm
    Oaklands Museum, Moulsham Street
    "Unusual Antennas"
    by John Regnault G4SWX

    Guest speaker John Regnault G4SWX returns to CARS – on the topic of novel VHF Antennas

    John who is an EME enthusiast and the RSGB VHF Manager has previously given us talks on 'Building a Remotely Operated Station', 'Introducing Moonbounce', and 'Tricks with Coax'.

    This time he will give a thought provoking talk on some of the more unusual antenna configurations that are possible.

    The evening will also feature our famous raffle, as well as refreshments.





    June Meeting
    Tue 5-Jun-2018, 7.30-10pm
    Oaklands Museum, Moulsham Street
    "Table Top Sale"
    By CARS Members

    In order to assist with construction and recycling, the June meeting is the CARS Radio and Electronics Tabletop Sale, coordinated by Secretary Colin G0TRM.

    Items for sale can be from the whole range of radio, electronics, visual and audio, mechanical interest and more.


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