Category Archives: Uncategorized

“Mr Marconi and his marvellous invention: Maritime wireless telegraphy from the Kingstown Regatta in 1898 to the sinking of the Titanic in 1912 and beyond.” + demo!

Folks,

Dr. Elizabeth Bruton is back with us again to kindly give us a talk
entitled “Mr Marconi and his marvellous invention: Maritime wireless telegraphy from the Kingstown Regatta in 1898 to the sinking of the Titanic in 1912 and beyond.”

Peter G4JNU with David M0DHO’s help will also demonstrate a Marconi detector in action.

Venue: Woodford Park, Woodley
Time: 8pm

In the aftermath of the sinking of the Titanic in 1912 and the
subsequent enquiry, the then-Postmaster General Herbert Samuel publicly declared: “Those who have been saved, have been saved through one man, Mr. Marconi … and his marvellous invention.” But what were the origins of this “marvellous” and life-saving invention and what impact did it have on maritime safety? From young Italian inventor Guglielmo Marconi’s world’s first of live event reporting by wireless at the Kingstown (now Dun Laoghaire) Yachting regatta in July 1898 through to Marconi’s experiments at Crookhaven between 1901 and 1914 and hence to the vital, life-saving use of Marconi wireless telegraphy on board the Titanic in 1912, this illustrated talk will uncover the practical and commercial application of wireless telegraphy for the maritime world and its potential impact upon maritime safety in the twentieth century.

Dr Bruton is Curator of Technology and Engineering at the Science
Museum, London specialising in communications. Previous roles include Heritage Officer at Jodrell Bank Discovery Centre, University of Manchester; Co-curator and researcher for the Heritage Lottery Fund (HLF) project and exhibition ‘Dear Harry: Henry Moseley, a scientist lost to war’ at the Museum of the History of Science, Oxford; and postdoctoral researcher for AHRC-funded project ‘Innovating in Combat: Telecommunications and intellectual property in the First World War’ at the University of Leeds. She was one of the 2014-2015 Marconi Byrne-Bussey Visiting Fellow at the Bodleian Library, University of Oxford and also catalogued and researched the Marconi Collection at the Museum of the History of Science, Oxford.

In case you haven’t seen her before, she is also a brilliant speaker and
communicator.

Tea, coffee and biscuits will be in abundant supply.

73

John
G4RDC

Folks,

Thanks to Michael M0MPM, we have a talk entitled “An Introduction to 3D Printing for the Radio Amateur” by James Patterson, M1DST.

Date: Thursday 27th September
Venue: Woodford Park Leisure Centre, Haddon Dr, Woodley, RG5 4LY
Time 8pm.

From James:

“We will introduce you to the fascinating world of 3D printing where we will learn about the different 3D printing methods with a focus on
inexpensive FDM machines. You will leave with an understanding of how the machine works and how 3D printing can be used as a tool to improve your Amateur Radio life. We will discuss the tools used to take an idea from your head to become a finished item.”

Refreshments available as usual.

Looking forward to seeing you there.

73

John
G4RDC

Provisional Intermediate Licence Course – 20/27 October and 3 November

Dear Members,

Please note that Ray G3SCZ and his team are hoping to run a RADARC Intermediate Licence Course on 20/27 October and 3 November this year at Woodford Park, Woodley.

There are currently only a few signed up, so if you are interested or know someone who may be interested please ask them to fill in the form on the Training -> Intermediate Training section on the radarc.org web site.

Thanks and 73

RADARC Committee

meeting 13th September “The Speed of Light” by Prof. Bob Lambourne

Next meeting Thursday 13th September, Woodford Park Leisure Centre, Haddon Dr, Woodley, RG5 4LY.

In the words of the great NGX, Eyes down 8pm.

With a huge thankyou to Ian 2E0DII, to kick off the Autumn season we welcome Prof. Bob Lambourne with a talk entitled “The Speed of Light”.

Bob says: “As a title I should like to speak about ‘The speed of light’. This will enable me to combine a number of topics that might be of interest to Radio Club members, including some historical info about James Clerk Maxwell and Oliver Heaviside. Since 1983 the speed of light (and of radio waves!) in a vacuum has been defined to be exactly 299 792 458 m/s.

This talk will examine the story of how the speed of light made the transition from a measurable speed, with a value that could be determined experimentally, to a quantity of such fundamental and practical importance that the decision was made to assign it an explicit and exact value that would put it beyond future measurement.  Along the way there will be a discussion of why the speed of light represents a local speed limit in Einstein’s special theory of relativity, even though many faster than light phenomena are easily demonstrated. According to currently favoured theories, all sufficiently distant galaxies are moving away from us at more that 1 light year per annum; consequently, after less than 14 billion years of cosmic expansion, the edge of the observable universe (the cosmic horizon) is at a distance of about 46 billion light years – a neat trick in a universe limited by light speed travel! ”

James Clerk Maxwell, for me, is the patron saint of radio. A truly beautiful mind. He mathematically worked out how electricity and magnetism work together to produce our beloved electromagnetic waves.

Bob Lanbourne is Professor of Educational Physics art the Open University and Director of Studies in Physical Sciences at the Oxford University Department for Continuing Education. He was born and brought up in Reading but attended university in London, where he took a BSc in physics and a PhD in theoretical particle physics. His first university teaching post was in Durham where he taught the Maths Honours module in general relativity and cosmology. He has worked at the Milton Keynes campus of the Open University for over 40 years, where his roles have included three years as Head of the Department of Physics and Astronomy, and five years as National Director of the Physics Innovation Centre for Excellence in Teaching and Learning (piCETL). His work outside the OU has included periods as Senior Vice-President of the Institute of Physics, Chair the the Physics Education Division of the European Physical Society, and Chair of the International Commission on Physics Education, one of the Commissions of The International Union of Pure and Applied Physics.

“Night on the Air Take Two”

Next meeting Thursday 23rd August at Reading Rugby Football Club, Holme Park/Sonning Lane, Sonning, Reading RG4 6ST. Historically this is a “Drinks Evening”/relaxed social evening but I think we can squeeze some radio in too.

The new club rig will be brought out to play and weather permitting we’ll put on an HF station and/or possibly 6m/4m.

Feel free to bring along any items that may be of interest – possibly
acquisitions from recent rallies?

The bar will be open. Informally we’ll start at 7pm to make use
of the daylight (and the bar).

If you have any bright torches/lamps might be worth bringing one along to help us clear up as the nights are drawing in even more 🙂

Kevin G0PEK and Lauren 2E0HLR on the Thames!

Folks,

Kevin G0PEK and Lauren 2E0HLR will be passing through our neck of the woods active on at least 2 metres.  I understand they will be on a boat on the Thames, possibly canoeing and operating radio. Possibly all at the same time. They will be at Wallingford on Friday.

Lauren is only 12 and has climbed all 214 ‘Wainwrights’ and is a great advocate for amateur radio.

Be sure to give them a shout and a great Thames Valley welcome.

Lauren, M6HLR – Wainwrights success

Thanks to Dave G0TKV for spotting this.

73

John

G4RDC

McMichael Rally 2018 – 22nd July 2018 – Call for Helpers!

Folks,

“Our”rally is coming up soon. We need all the help we can get with prep on the Saturday and running the show on the day.

It is a significant South of England rally thus important to the amateur community as a whole. Newbury, Luton, Wildhern et al. put on a great show this year – let’s do the same for our guests!

The McMichael Rally Committee have put in a lot of hard work in getting to this point. They deserve our support now.

Please contact Denis G4KWT if you are able to help. As he says,

“*** YOUR RALLY NEEDS YOU ***”

Thankyou,

John
G4RDC

Michael Meerman’s (M0MPM) amazing QSL card page is now live on RADARC.org!

After some hard work from Michael M0MPM, Tom M0LTE and our web team, we are happy to announce that there is a live QSL card viewing system for RADARC (M0AAA,MX0AAA,G3ULT, G3AKF, M4T,M0EEE).

There is a vast amount of cards to see and one can search, browse or just sit back and watch as a slide show.

Click below

https://qsl.radarc.org/RADARC

Thanks again to all involved.

73

Simon M0ZSU, RADARC

Podcast about Understanding Receiver Specifications

Thought the following Podcast might be interesting to members:

https://www.hamradioworkbench.com/podcast/understanding-hf-receiver-specifications

Eric Swartz WA6HHQ, co-founder of Elecraft, joins us to guide our understanding of RF receiver performance specifications. Eric introduces us to common receiver specs such as Sensitivity, Noise Floor, Dynamic Range, Intermod Dynamic Range, Phase Noise, and RMDR. He tells us what they mean in real-world receiver performance terms, how they are tested, and whether it’s better to have a higher or lower number in each one. It’s also the final episode before the 2018 Hamvention and George and Jeremy share our plans for our Booth, special offers, and exclusives for show listeners who stop by booth 3104 in Xenia.

David M0DHO