Chelmsford Amateur Radio Society
    Afflilated to the RSGB
Callsigns used include: - G0MWT, GX0MWT, GB5SM, GB70GB, GB5RVA, GB100MWT & M2T
Awarded the Kenwood Trophy for Training 2007 and Club of the Year 2009 by the RSGB.
Awarded Lottery Grant by Awards for All, November 2008.

Latest Changes
25th August 2014 Added the September Meeting details and made corrections.   Amended the CARS Committee listing.   Added the Sandford Mill Report for Sunday, 17th August.   Amended the report & photos from the CARS August Meeting.  

Click here for the latest information - to prevent duplication: -
  • Click for Training and Skills Nights
  • Meeting Venue

  • Meeting
    Tuesday, 2nd September 2014, 7.30-10pm. .
    At Oaklands Museum, Moulsham Street, CM2 9AQ.
    "D Star Radio Operation and Demonstration"
    By Joel, G0URK and Gary, 2E0ULA.

    An opportunity to come and see D-Star in operation and to learn what it is all about.

    The Meeting will also be inter-active with Questions ans Answers.

    James, 2E1GUA and Carl, G3PEM will run the famous CARS Raffle.

    Light refreshents will be available thanks to David and Myra Davis.

    See you there?

    Tuesday, 5th August 2014 .
    At Oaklands Museum, Moulsham Street, CM2 9AQ.
    "Constructors Competition"
    By CARS Members.
    It is our annual Constructors Competition this month, be it a humble Dummy Load to an all singing all dancing Transceiver - bring it in to the Competition.

    As long as the item has a link to Amateur Radio it is eligible, the only rule is that it must be electrically safe!   If it too large to bring in to the meeting then an entry of a multimedia presentation of the item is OK.

    The emphasis is on the construction of the item, be it your own design, built from a kit or just copied from a magazine, we would like to hear about it!

    CARS Constructors Competion.
    CARS President opening the Meeting.
    Photographs by John G8DET.

    CARS Constructors Competion.
    Peter, G3SUY explaining the construction of his 400 Watt Linear for portable working.

    CARS Constructors Competion.
    Bruce Saunders, M0XBS explaining his Field Strength Meter and his 5 Amp PSU.

    CARS Constructors Competion. CARS Constructors Competion.
    Charlie, M0PZT explaining how he turned a Tablet into a Logging Computer.

    CARS Constructors Competion.
    Colin, G0TRM explaining how he made a Morse Key from a Tea Strainer - 9th year he had constructed such a device.

    CARS Constructors Competion. CARS Constructors Competion.
    Clive, M0GHH explaining the details of his High Speed Fuse with a Hair Drier.
    Photos by Colin, G0TRM

    CARS Constructors Competion.
    John, G8DET holding and explaining his FM Tuner from 1976.
    Photo by Colin, G0TRM

    CARS Constructors Competion.
    Andy, G1GKN explaining how he built his 470kHz 10 Watt Transmit Transvertor for use with his FT817.

    CARS Members voted and the results were as follows:-

  • First Prize - Peter, G3SUY - 400Watt Linear.
  • Second Prize - Andy, G1GKN - 470kHz Transverter.
    Unfortunately due to an error by G8DET this appears as 3rd Prize on the September NL - sorry Andy.
  • Third Prize - Charlie, M0PZT - Logging Tablet.
    Unfortunately due to an error by G8DET this appears as 2nd Prize on the September NL.
    Thanks for drawing G8DET's attention to the errors Charlie.

  • Special Prize - Bruce, M0XBS with his PSU & Field Strength Meter.

    After the construction competition, Murray G6JYB gave a recap of the recent proposals in August RadCom regarding encouraging youngsters, construction and demonstrating Amateur Radio.   This provoked a good discussion on demonstrating radio to the public.

    CARS Constructors Competion.
    Murray looking at his screen presentation, see below.

    CARS Constructors Competion.
    Murray's Summary Slide.

    A copy of the full RadCom article is availiable in PDF Format here

    It suggest three options including a new basic/junior VHF licence but, as the summary says, if you have a better idea contact the RSGB via 'haveyoursay'.

    The now famous CARS Raffle was run by James, 2E1GUA.

    CARS Constructors Competion.
    James surrounded with the Raffle Prizes.

    Light refreshments were also served by David and Myra with a delicious selection of biscuits.

    A very good evening of a variation of Home Constructed items which shows Home Construction is NOT dead!
    Thanks to ebveryone who turned up and demonstrated their apparatus.
    The Certificates and Shield will be awarded at the October AGM.

    Sunday afternoons, 3rd, 10, 17 and 24th August.
    At Sandford Mill and Oaklands Museum, Moulsham Street, CM2 9AQ.
    "Commemorate the Beginning of WWI"
    By CARS Members.

    Sandford Mill – Marconi 1154 TX and 1155 RX Afternoon - 24th August.

    This Sunday CARS were competing with the Bank Holiday - Sunday was forecast as being nice and next day, Monday being 100% wall to wall rain.   This meant that anyone with a garden HAD to stay at home and cut the grass and garden. & nbsp; This resulted in a much lower public attendance than for the previous 3 Sundays.

    Peter Bridgeman brouight along his beautifully restored Marconi 1154/1155 and set it up in the Marconi Hut a couple of days before so we were on the air at the dot of 2pm (local).   Unfortunately 80Metres is not a good frequency to use during the early afternoon and we did stuggle a bit except occassionaly the stations boomed in 5 by 9 plus 20dB.

    A number of CARS members had a go on the microphone but there was more interest from visiting members of the public.
    Of the 80,000 sets produced there are only a handful now in operational use throughout the World.

    We also had some locally generated QRM which could be tuned - on our frequency!

    Light refreshments were gratefully partaken in the Tea Hut - thanks.

    A good time was had in the sun and on the radio.

    Thank you Peter for all the work involved in setting up the station and answering all the questions so well.

    Sandford Mill – CW Afternoon - 17th August.

    This Sunday CARS were competing with the V Festival and I think we won.   The weather has been unstable and about 1pm we had a quick but strong storm but the Sun came out for us all afternoon.

    Andrew Kersey, G0IBN set up the CARS IC756 in the Marconi Hut complete with the CARS 17" Computer.
    7Mhz was used all afternoon with plenty of European station ready to work GB100MWT.

    Brian Styles, G3SND motored down from Huntingdon and was soon transmitting using a traditional Morse Key under the expert supervision of Andy.   Later he said he really enjoyed it but thought it was best described as "an hour in a tumble drier!"

    Charlie M0PZT surprised us all by appearing because "the weather improved" and assisted with setting up the station and having a go on a "paddle Morse Key".

    CARS Sunday Afternoons CARS Sunday Afternoons
    The CARS CW Team in operation.
    Photographs by John G8DET.

    CARS Sunday Afternoons CARS Sunday Afternoons
    Andy at the controls.

    CARS Sunday Afternoons CARS Sunday Afternoons
    Colin at his Morse Display table.

    CARS Sunday Afternoons CARS Sunday Afternoons
    Charlie, M0PZT and John Roe, G4IMS at the Key with Oliver Prin, M0WAG and Andy logging.

    CARS Sunday Afternoons
    Andy explaining the Morse Code to Toby, Ayaan and Hughie and getting each to send their name in Morse.
    Photograph reproduced with kind permission of their Father watching.

    Rides were available on the Canal and Colin, G0TRM captivated the younger members with his Morse Key demonstrations.   The Tea Room did a brisk service supplying the helpers with lovely large cups of tea - thanks.   The Walkers popped in from time to time to see what we were all doing.

    The final Sunday Afternoon on 24th August at Sandford Mill will be with Peter, Bridgeman, G3SUY and his Vintage 1154/1155 rack using 80 Metre AM and with superb audio quality.

    Sandford Mill – When All Else Fails - 10th August.

    Sunday the 10th of August was set to be a standard afternoon’s operating at Sandford Mill Museum, but events took an unexpected turn.   The Met Office had issued weather warnings for the day, as Britain expected to see the tail of Hurricane Bertha.   Following a burst of heavy rain and lightning, a problem with local overhead power cables killed all power to Sandford Mill Museum, just after the gates opened to one of the museum’s August public open days.

    CARS Sunday Afternoons CARS Sunday Afternoons
    The Marconi Hut and the Water Race nearby - above is CARS 80M Doublet Aerial.
    Photographs by John G8DET.

    On the microphone, Derek M0SCE and his Son, Lloyd, M6LHG from Southend, logging had just said "73s" after their first QSO with a G1 station in Ipswich when the lights, and the rig, lost power.   When it became clear that the problem wasn’t a simple fuse and we could be off for some time, Charlie, M0PZT accompanied John G8DET home to pick up his generator, and before long, GB100MWT was back up on air, running the full 100 watts on 40m, using the club’s Yaesu FT-847.

    CARS Sunday Afternoons CARS Sunday Afternoons
    The faithful 2.5KWatt Generator.

    CARS Sunday Afternoons CARS Sunday Afternoons
    Peter, M0PSX Logging with Charlie, M0PZT and James, 2E1GUA on the mics.

    Operators for the afternoon were Charlie M0PZT and James 2E1GUA, with Pete M0PSX on logging duties and Jim 2E0RMI talking to the museum’s visitors.   Other amateurs visiting included Derek M0SCE and his Son, Lloyd M6LHG from Southend, Geoff G7KLV, Clive M0GHH and Geoff G3EDM.

    Despite the power outage, visitors to the museum were still able to enjoy the many exhibits at the museum, but with the Amateur Radio station powered, lit and connected to the Internet, the station drew more attention than normal.   The badly-timed power outage did present the team with the opportunity to point out to the museum’s visitors that when all else fails, Amateur Radio still works!   Demonstrating the best virtues of the hobby: teamwork, technical knowledge and pooling of resources, it’s hoped that some of the visitors will now be keen to join one of the club’s upcoming Foundation courses, and start their journey into the world of Amateur Radio.

    Two trucks from ‘UK Power Networks’ were onsite fairly quickly, and power was restored – but after the station was dismantled, and as the last visitors were leaving.

    For details on the afternoon’s activities, and a selection of photos, go to:-

    See also the Essex Ham Link

    Thanks to Peter Sipple, M0PSX for the above report.

    Oaklands Museum - 3rd August.

    CARS was at Oakland Museum to "Meet the Public" on the normal opening hours of the Museum, 1pm to 4pm.   As RadCom commented recently the general public are not always impressed with a Radio Amateur crouched over a radio shouting "CQ, CQ, CQ...." and have suggested that a "Meet the Public" is more friendly.   With this in mind CARS today did both.

    CARS would like to thanks Nick Wickenham, Manager for Oaklands for his support with the Ofcom Application for GB100MWT in January 2014 and Mr Ian Leonard for arranging today's presentation at Oaklands Museum.

    Thanks to David and Myra Davis, G3SVI and M0MYA for giving up a family visit to come to Oaklands. Thanks also to Colin Page, G0TRM for supporting CARS at Oaklands and bringing his hugely successful Morse Demonstration Keyboard.
    It was noted that in 1914 all wireless communications was using Morse, both by the British and Germans.

    CARS Commemorating WW1
    John G8DET and David G3SVI standing behind the excellent table display.
    Photographs by Colin, G0TRM.

    Colin comments " I think we can say it was a successful afternoon, even though we perhaps did not gain many converts.   With your help Myra we did spread the word a little on the Morse front.   As I think you may have intimated, it was the ‘key’ to the afternoon. (sorry about that!)".

    Sandford Mill – 3rd August.

    President Carl, G3PEM and Geoff Lovegrove, G7KLV set up the rig and computer for logging before Sunday at Sandford Mill (TL70) and this was a great help as it meant the SSB operating team could switch on at 10am and "go straight away ".   Peter Bridgeman, G3SUY and Charlie M0PZT found a clear frequency of 7.122MHz and were able to hold it until 5pm even though a couple of amateurs tried tuning up on it and repeately calling CQ - but to no avail!

    CARS Commemorating WW1
    Photo of the rig with the operating frequency displayed.
    Photographs by Charlie, M0PZT using his Camera Phone.

    Charlie reports We worked around 250 QSOs spread across 9 countries. Our small group of operators rotated between operating, logging and talking to members of the public.   The museum got particularly busy and it was nice to see some of the youngsters showing an interest in our activities.   A QSO map of some of our contacts is shown below.

    GB100MWT Special Call-Sign was used throughout the day.

    CARS Commemorating WW1
    Map of some 105 of the contacts.
    Additionally there was a MA3 from John O'Groats and a QSO from the West Coast of Ireland.

    During operating periods when Charlie invited M3 and M6s only we had a contact with an Amateur running only 1Watt.

    Operators and Loggers additionally included Tony Gilbey, G4YTG; Chris Chapman,G0IPU; Oliver Prin, M0WAG and G8DET.   Trevor Sandford. G4LPS stayed supporting the CARS team all day while Bob Davy watched and listened to what was going on.

    CARS Commemorating WW1
    Charlie and Peter at 10am.

    CARS Commemorating WW1
    G8DET logging with G0IPU on the microphone.

    CARS Commemorating WW1
    Oliver Prin on the microphone with Chris Chapman logging.

    CARS Commemorating WW1
    John G8DET logging with Charlie M0PZT on the mic.
    Photographs by Chris G0IPU.

    CARS Commemorating WW1
    As above but with Trevor Sandford G4LPS looking on.

    CARS Commemorating WW1
    Charlie on the mic with Oliver Prin, M0WAG logging.

    CARS Commemorating WW1
    Roles now reversed!

    Members of the public joined us from 2pm to the close at 5pm, hence the increase in locally generated audio QRM.   Some 200 members of the public turned up and enjoyed the lovely weather and the Free to park - Free to enter - Free to enjoy themselves .
    Members of the Friends of Sandford Mill were on hand to assist in many ways - thank you.

    Thanks to Dr Geoff Bowles for arranging the event.
    Thanks to Charlie, M0PZT for attending the whole day and operating so well.

    Sandford Mill will be open to the Public from 2pm to 5pm on Sunday afternoons on the 10th, 17th, and 24th but NOT the 31st.   CARS will be operating on all those dates.

    See you there?

    Tuesday, 1st July 2014 .
    At Oaklands Museum, Moulsham Street, CM2 9AQ.
    "Launching and Tracking of 434 MHz Balloons."
    By Chris Stubbs, M6EDF.

    Chairman, John Yates, G1UZD opened the meeting with a schedule of CARS events during the past couple of months and into the future for a couple of months also.   He said the Skills Evenings had been a great success with a growing number attending.

    Chris StubbsTARG Meeting 2014
    Chairman John Yates, G1UZD opening the meeting to a capacity audence.
    Photograph by John Bowen. G8DET

    Chris StubbsTARG Meeting 2014
    The audience.

    Chris Stubbs M6EDF then gave his presentation on the launching and tracking of 434 MHz equipped balloons.   He gave a run down of the types of balloons and how they were equipped - showing one made out of thin silver material.   As the weather was very favourable Chris said he proposed to launch CARS1 so for the first time in 50 years Member trouped to a spot Chris has selected at the rear of the Museum.

    Chris StubbsTARG Meeting 2014
    Spot chosen by Chris for the launch - the area in the Sun.

    Chris StubbsTARG Meeting 2014
    Trouping to the launch site.

    Chris StubbsTARG Meeting 2014
    Chris preparing the launch - waiting to obtain Satelitte aquisition.

    Chris StubbsTARG Meeting 2014
    The launch.

    Members held their breath as the Balloon headed straight for a 80foot Fir Tree but the air currents swept it around with just a few feet to spare. Members then gently reassembled and listened intreged as Chris went through the details of how the various Balloon systems worked.

    Chris StubbsTARG Meeting 2014
    GPS Map of where it was after a few minutes - over Blackmore - to the South West of Chelmsford and steadily climbing.

    Chris StubbsTARG Meeting 2014
    Chairman John presenting Chris with a CARS Mug in gratidute for such a nicely presented evening.

    Chris took the Amateur Radio Foundation training course run by CARS in January 2013.   He is keen on both electronic construction and software development and combines the two interests in High Altitude Ballooning (HAB).   Chris has built many tracker payloads for his balloon launches which usually take place from Danbury Common near Chelmsford.

    In May he undertook a STEM (Science, Technology Engineering and Mathematics) event for pupils at the The Sandon School in Chelmsford, launching a balloon equipped with his 434.300 MHz tracker enabling the students to track the position of the balloon in real-time.

    The trackers typically transmit 50 bps FSK RTTY in 434 MHz and can have a radio range of over 500 km.   The data transmitted comprises the GPS location of the balloon and other sensor readings such as pressure, temperature and altitude.   The signals are received by a network of listeners who upload the data to the UK High Altitude Society (UKHAS) central server enabling anyone to see the current location of the balloon on the web.

    Some balloon flights aim to achieve very high altitudes, others aim to stay aloft as long as possible.   Leo Bodnar M0XER recently achieved a record breaking flight from Silverstone to Japan using a party balloon with a tiny solar powered payload.

    Words by Trevor M5AKA and John G8DET.

    Carl and James will run the now famous Raffle.

    Chris StubbsTARG Meeting 2014
    Charlie and Carl at the Raffle Table.
    David and Myra (with help - hopefully) provided the light refreshments at the Break time.

    Another excellent eveing provided by CARS with visitors from London and Cambridge besides others.

    GB1JSS Summer Solstice

    Despite 40m+20m being very poor between 10am-2pm, things picked-up later in the afternoon.

    The RSGB Regional Manager, Steve M1ACB paid us a visit and not only had some very nice things to say about our activities but also managed an hour on the 40m station when the band had recovered.   Over 30 locals visit during the course of the day plus a few interested members of the public and the occasional 4-legged visitor. Charlie's summary, can be found here:

    Charlie would like to thank those who helped - despite the rather poor band conditions we made the best of it and met some new faces.   Almost 300 QSOs and 36 DXCC in the log on 80m to 2m on CW, SSB, PSK and FM.

    Thanks to Mark M6RKC for the gazebo which kept us covered in the rather hot sun and Rob M0VFC (Camb Hams) for spending the day with us to operate 30m CW and allowing us to use his bandpass filters.

    Finally, I'd just like to thank CARS for their support with the event.

    Thanks Charlie, M0PZT for the above report.    

    See also the Essex Ham Link

    CARS Meeting Place

    CARS meet on the First Tuesday in the month at the Oaklands Museum, Moulsham Street, Chelmsford, Essex, CM2 9AQ.

    We meet on the First Floor. There is a lift for wheel chairs. Doors open at 7pm for 7.30pm start. Please identify yourself to Brian, G3CVI when you sign in and purchase a Raffle Ticket or two for Club Funds.

    Tea/Coffee/Chocolate is available on a DIY basis at 9pm break time.

    There is normally no admission fee to CARS Meetings - Visitors are always welcome.    

    The Raffle is drawn after the refreshment interval. Meeting will end at 10pm, as the gates will be locked at 10.15pm

    CARS new Venue-Oaklands Museum
    Oaklands Museum, Chelmsford.

    Directions / Parking

  • Click here to find two maps for Oaklands Museum

    You can drive all the way up Moulsham Street from Parkway but NOT the other way.

    Another way is to enter Moulsham Street after going round the Miami Roundabout (by Tesco), then along New London Road 200 yards, turn right into Moulsham Street and after 100 yards turn right again into the Museum.

    WARNING: There are three very high Sleeping Policemen to prevent "Rat Runners" - they will tear the bottom of your car unless you go steadily over them.

    There is plenty on car parking but it is not intended CARS to park directly infrom of the Museum - reserved for people unloading kit and Disabled car drivers.

    CARS Membership

    Membership is annual based on our October AGM. To be/remain a Member of CARS, send a Cheque for £15 for 2013-2014 to our Treasurer Brian G3CVI to:-

  • Brian Thwaites G3CVI, 118 Baddow Hall Crescent, Great Baddow, CHELMSFORD, CM2 7BU

    If you would like a receipt, please enclose a stamped addressed envelope with a 2nd class stamp.
    Note: Under 16s or in Full Time Education are FREE

    Please see the Membership Form by clicking on the following link : - Membership Form page

    Click here to go back to the Top

    Contact Information

  • Postal Address

    Chelmsford Amateur Radio Society
    South View Road
    CM3 4DX

    To contact CARS Chairman on any topic

    Newsletter & Membership

    A Monthly Newsletter is provided to every paid-up
    Member, either by E-mail (PDF) or by Post

    Contact Secretary
    Martyn Medcalf, G1EFL,
    Tel: 01245-469008

    Newsletter Editor:
    Alan Elcoate, G0RTH
    E-Mail to CARS Newsletter Editor.

    CARS Training Courses

    CARS offer a full range of Foundation, Intermediate and Advanced Amateur Radio Licence Training Courses, Morse Classes and Skills Sessions:-

    Training Contacts

    CARS Training Manager:
    Clive Ward, G1EUC
    Tel: 01245-224577
    Mob: 07860-418835
    E-Mail to CARS Training Manager.

    Morse Training Manager:
    Andrew Kersey, G0IBN
    Tel: 01621-868347
    E-Mail to CARS Morse Training Manager.

    Direct QSL Address:-

    Chelmsford Amateur Radio Society
    South View Road
    CM3 4DX
    GX0MWT QSL Card

    Click here to go back to the Top

    ©Copyright CARS 2014.