Next RADARC club meeting is Thursday 25th May at Woodford Park Leisure Centre, Woodley, 8pm.
Our very own Steve Coleman G4YFB presents brief history of radar from the beginning, through the ‘hardware’ stage to the ‘software’ stage of modern radar.
Refreshments to be served as usual.
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!
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.
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
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
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.
Reading Hackspace Visit
On Wednesday the 23rd of November a group of members from RADARC headed down to find out more about the Reading Hackspace, known as “rLab”.
Upon arrival at the small industrial area in the centre of Reading, a small unit with nothing more than a door and a couple of windows sits quietly in the otherwise dead industrial area.
It is 8pm and we approach the door to be greeted by a member of rLab. They led us up the stairs and told us that there would be someone around to give us a tour. My first thoughts… WOW…
The first room we came to was the electronics and desk area. People are sat working all around the room on everything from CAD designs and soldering through to Hard disk recovery and coding. We instantly started asking questions and getting to know a little bit about the group.
Once someone became available we were led around the building being shown all of the awesome equipment, tools and machinery they have there. It was one hell of an eye opener to see that this whole community runs off membership donations and kindness. There were lathes, laser cutters, 3D printers and much more.
We then went back upstairs to the electronics/workbench area and “mingled”. There were some people playing around with LED light boards, clocks, Raspberry Pi’s, Arduino’s, Hard disks, coding on (very) old hardware and much more. We got a demo of the laser cutter which was seriously cool too!
All in all it was a very nice evening and we all look forward to getting to know the hackspace community. We hope that they will also come to find out more about RADARC in the near future. As always, everyone is welcome!
Stay tuned for more posts about our events in the future!
Written by James 2E0JPM