Category Archives: Events

In-depth DMR talk by Denis G0OLX and Colin G4EML

Denis Stanton G0OLX and Colin Durbridge G4EML will be with us on Thursday 22nd June for an in-depth look at DMR or “Digital Mobile
Radio” (so sayeth wikipedia). These two chaps are acclaimed experts in the field (at least by Ian G8NXJ so that must be right). Find out all
about colour codes, code plugs and time slots. Rig prices are becoming affordable making this relatively new area of our hobby quite accessible.

Venue: Woodford Park, Woodley, 8pm.

Refreshments to be served as usual.

Signals Analysis of MH370

We have a special meeting forthcoming on 8th June (election day).

Venue: Palmer Building, Reading University, Lecture Theatre 109.

Use Shinfield Road entrance to campus. Post Code RG6 6UR.

Alan Schuster Bruce from Inmarsat will give a talk entitled “Signals
Analysis of MH370”.

He will talk about the innovative methods used in the analysis of
satellite radio signals from Malaysian Airlines MH370 to determine its flight path.

The disappearance of flight MH370 just over three years ago, you may recall, was an event of global significance. I personally was proud to see a UK company immediately leading the world in science and technology with heroic efforts to explain what happened. And particularly to see radio communications being “front and centre”.

It is a real privilege for us to be able to host this meeting.

It’s fine to bring guests but please let me know if you intend to do so
and how many.

Parking permits are not required on site. The closest car park to Palmer is Car Park 4.  Please see Whiteknights campus map and keys 2016 (1)

73

John
G4RDC

Thursday 11th May meeting: Emergency Services Communications – a perspective from recent history

Folks,

Peter Butcher is with us on Thursday 11th May for the next club meeting.
Venue: Woodford Park, Woodley as usual.

In his own words:

“Communications between the Emergency Services, Police, Fire and
Ambulance have always been a problem. Complete inter-operability has been an elusive goal since the 1960s, so what has changed?
Three disasters; The East Coast Floods, the Isle of Wight Air Crash and Lockerbie prompted the Home office to take action and a set of
frequencies was allocated for the Emergency Services to allow
inter-operable communications. Planning rules were established and the question arose as to how many radio sites would be needed for a network to cover England and Wales.

A contract was awarded to Racal Radio in 1993 to calculate that number and I worked on that report as a Consultant, having recently retired from the Racal Radio Group.

The paper describes that work in detail, showing how time consuming and difficult propagation predictions were in those days and how two
different methods; manual calculation and early computer-aided
prediction gave sensibly the same results.
How that information was used and where we are now gives an interesting insight to government. After some long winded correspondence, the Home Office gave me permission to re-publish my historic report and added their version of today’s position.
Basically this paper is an historic archive of how things were and how
much, or little, things have changed!
Peter Butcher.
April 2017”

A big thankyou to George M0GXB for helping organise this one.

Refreshments to be served – or perhaps more accurately to be made
available. Audience participation may be required to make them happen.
There will be many, many biscuits. Some of them in date.

Looking forward to seeing you there.

73

John
G4RDC

Magnetic loop antennas and fundamental antenna questions – Prof. Mike Underhill G3LHZ

Folks,

At our next meeting we welcome Prof. Mike Underhill G3LHZ to tell us all about magnetic loop transmitting antennas including the latest research. He will bring a selection of loops.

Venue: Woodford Park, Woodley, 8pm as usual, Thursday 27th April.

Further, Mike will address fundamental questions about antennas in
general.

Mag loops offer interesting possibilities where space is at a premium –
a number of them we are hoping will fit in the tea room at Woodford
Park.

Also, if extreme volts and amps are your bag – this is definitely one
for you. I’m no expert (Rael is, M0RTP) but the tuning caps need to be
specially designed to handle the high voltages (often involving vacuums) and the loops themselves need low resistance.

Tuning of said caps offers challenges for micro controller/computer auto tuning so there’s something for Arduino/Raspberry Pi enthusiasts etc. – indeed Rael has done quite a bit of work here.

Refreshments to be served as usual.

Looking forward to seeing you on Thursday.

Many thanks to Rael, our own mag loop exponent, for helping organise this meeting.

cheers

John
G4RDC

Digital Voice Modes from a User Perspective, Tim Kirby G4VXE

 Folks,

Next RADARC meeting is on Thursday 13th April  when Tim Kirby
G4VXE joins us again to look at the DMR, DSTAR and Yaesu Fusion digital voice modes from a user perspective.

Venue is Woodford Park as usual, 8pm.

Please feel free to bring along your digital voice mode hand held
equipment. Or larger if you wish. I’d be particularly impressed with
thermionic equipment (perhaps in the shape of a linear??).

If anyone has PC programming stuff they could demo that would also be good. I keep hearing about ‘codeplugs’ and it would be great to see one in all it’s 3 pin glory 🙂 Though I suspect you wouldn’t want to
connect it to the mains.

On the software side, if anyone has DSD working on a PC/tablet it’d be great to see that too.

Digital Speech Decoder

SharkRF openSPOT also looks interesting
https://www.sharkrf.com/products/openspot/ – thanks PW for pointing that one out 🙂

Refreshments to be served as usual.

A huge thankyou to Tim for supporting us.

Look forward to seeing you there.

cheers

John
G4RDC

53 years of Earth-Moon-Earth (EME), then and now

Folks,

Peter Blair, G3LTF, joins us on Thursday 9th March, 8pm at RADARC for a talk entitled “53 years of EME, then and now”.  He will take a look at how it started and then a look at the scene today, in particular the technology developments. The concentration will be on the bands above 144MHz.

Prepare to be amazed at the possibilities and see how you might get started yourself!

Venue: Woodford Park Leisure Centre, Woodley, RG5 4LY as usual.

Refreshments will be provided as usual.

73

John

G4RDC

 

Simple Satellite Operating by Tim Kirby G4VXE

Folks,

Next RADARC meeting is Thursday, 23rd February at Woodford Park,  Woodley, 8pm as usual.

Satellite operating is easier than you think! Tim Kirby G4VXE (of Practical Wireless fame – need I say more) explains how to get started on the amateur satellites as simply as possible. Hopefully afterwards, you’ll want to give it a go!

In the words of the great G3NGX “Get to your seat by 8.00.  Pin back your ears  at 8.10.  Digest what you have heard at 9.30 and wash it down with a  cup of RADARC coffee.  Consider how this could change your life for  the better.”

Looking forward to seeing you all.

Visitors welcome!

73

John

G4RDC

Didcot/Harwell Radio Rally Sunday 12th February 2017

Sunday 12th February 2017

HARWELL AMATEUR RADIO SOCIETY are holding a Radio and Electronics Rally at Didcot Leisure Centre, Mereland Road, Didcot, OX11 8AY from 10.00am-3.00pm. There will be radio and electronics trade stalls, a Radio Society of Great Britain bookstall, information on local courses for those who would like to become a Radio Amateur and an Amateur Radio Demonstration Station. Refreshments will be available all day. Entry £3.00 (children under 12 free). Details from Ann G8NVI on 01235 816379 or ann.stevens@btinternet.com