Chelmsford Amateur Radio Society

CARS Meetings   July - September 2017

Award for All

27th Aug 2017

Added August Constructors

July Meeting
Tue 7-Jul-2017, 7.30-10pm
Oaklands Museum, Moulsham Street
"Three Short Talks"
By CARS Memebers

After a very successful debut last November, the three-talks format returned with some more enlightening topics:-

The first two ran before the break and raffle with the third one after the break. A little more about the speakers and the topics:-

Bryan and part of the Type-52b (No 237) Airborne Spark Transmitter

Tony started by telling us about wave transmission using an illustration of ripples (waves) in a pond showing how they could be related to the terms we use in Radio and how they were related to the parameters and terms we are familiar with Wavelength, Frequency, Modulation, CW, AM, FM and the speed of transmission in liquid, sound and light (Radio Waves).

Following the refreshments and raffle break, Murray gave the final talk in which he eventually revealed the answer to the teasing talk title - which was that one of the great hidden gems is the “Museum of the Story of Communications “ in the Eur governmental district of Rome. A statue of Marconi is in the telecoms ministry entrance next to the museum. The latter was founded in 1982, with a collection covering 2000 years of history starting with the Roman Postal system, followed later by Swiss Post, Pirelli telecoms cables, their Marconi collection and Olivetti equipment. Despite his trip to England, the Italians realised how important he was and have maintained their history of it all (unlike their English equivalents in Chelmsford and Ofcom!).


Useful Links:

  • Museum info is online at (Use Google translate in Chrome)

    August Meeting
    Tue 1-Aug-2017, 7.30-10pm
    Oaklands Museum, Moulsham Street
    "Constructors Competition"
    By CARS Members

    The August meeting iwas the annual time to show what had been constructed.- CARS accept all sorts of entries (and have done so in the past) from still photographs to video clips. The only real Rule is that it must be electrically SAFE.

    1) John G8DET: John presented three items to illustrate how NOT to do things which might seem alright at the time.

    • Dummy load in an aerosol can with sealed in carcinogenic transformer oil - Would explode when hot and/or give you risk of Cancer
    • Surge limiting set of electical components enabling an in-series filament lamp which could be switched out after the initial surge. (it had an illegal 13 amp plug which did not have shrouded live pins )
    • Homemade small aerial with reflector and diamond shape elements to improve mobile phone range. (did not work)

    2) Andy G0IBN: Presented a small memorial to the RAF including a "bathtub" morse key from a Shackleton maritime patrol aircraft, sounder and a model Lancaster.

    3) Peter Bridgeman G3SUY: Peter had built an 80 /160m tranceiver in a green metal case with a cream front panel completed some 6 months ago his design and construction.


    4) Dave Bolwell Entered a 6L6 valve amplifier for PA which he constructed some 50 years ago (with the help of Marconi's he said )

    5) Colin Page G0TRM: Colin demonstrated some Variometers which are a coil with some of its turns on a smaller former placed inside so that it could be made to increase or decrease the total induction by turning it on a spindle. He added an aerial and a detector diode to produce a tunable crystal set which he demonstrated with the use of a guitar audio amp

    During the tea break Tony G4YTG collated the audience votes. The result of the voting was :-

    1. First: A clear winner for Peters 80/160m tranceiver
    2. Second: went to Colin G0TRM's Variometer sets
    3. Third: to Andy's Memorial key base and oscillator

    Peter G3SUY (right) collecting his prize from Tony G4YTG

    The money prizes were presented on the night and the certificates will be presented at the AGM.

    September Meeting
    Tue 5-Sep-2017, 7.30-10pm
    Oaklands Museum, Moulsham Street
    " Radio Caroline"
    By Martello Tower Group

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