Next RADARC meeting Thursday 8th March, Woodford Park Leisure Centre, Woodley.
Eyes down 8pm.
Peter Butcher returns to deliver the intriguingly titled talk ‘Death
Rays: Fact or Fiction?’
You may remember Peter is an excellent speaker from his talk on
Emergency Communications Planning.
“Ever since the first recorded death by electrocution of J.G.
Doppelmayer in Nuremburg in the year 1750, the Military have pursued all new scientific discoveries as a means of killing without warning; the so called ‘Death Ray’.
This talk traces the evolution of these ideas from Doppelmayre through to the present day and shows how the various scientific discoveries were followed up. Electricity, Lightning, X Rays, The Electromagnetic Spectrum, Engine Stopping Rays and Nuclear Physics were all explored. Gradually, as all were rejected, Military thinking changed, as the type of warfare changed and today we have developed ‘Weapons of Denial’ as opposed to mass destruction”.
Then, enjoy a nice cup of tea and a biscuit or two.
Look forward to seeing you there.
In view of the current snowy weather situation in Reading, the construction meet at RRFC Thursday 1st March is POSTPONED.
Stay safe everybody – keep warm.
Height Matters – by Mike Naylor G4CDF on Thursday 22nd February 2018 at 8:00 PM – 10:30 PM Woodford Park Leisure Centre, Haddon Dr, Woodley, Reading RG5 4LY
During a recent shack tidy Mike G4CDF encountered many QSL cards from his student days. On looking though them Mike was surprised by what was achieved (mainly VHF/UHF I believe) using the presumably modest station set up at the time. This lead him to thinking about how the location it’s associated attributes affected communications.
No doubt with a splash of reminiscence and a good helping of nostalgia, this should be a very interesting talk, and I am sure we will all learn something including some details on to build a station that can regularly communicate over distances of several hundred kilometres, the effects of antenna size and height, and the effect of local terrain, power level and local noise levels.
We look forward to seeing you there.
[New year’s resolution diet busting refreshments will be served – G4RDC]
Simon, M0ZSU, RADARC
RADARC won the G3PSH memorial trophy for SSB Field Day 2016.
Although we came 2nd, the leading team were not eligible to receive the trophy because they had not registered.
From left to right: Jonathan M0JSX, Jim G0LHZ, Tom G0VQR, Ray G3SCZ, David M0DHO.
The next RSGB club championship is the DATA leg on Wednesday 14th Feb. It runs on 80m from 8pm to 9:30pm local time. You can find details at http://www.rsgbcc.org/hf/rules/2018/r80mcc.shtml. All valid QSOs count towards RADARC’s club score. The leading contributor wins the club ladder with a trophy presented at the AGM.
On Thursday 8th February, we welcome back “Professional radio amateur” Noel Matthews G8GTZ to tell us all about the Portsdown Digital Amateur Television project. You may recall his last talk on cubesats where they used magnets to orient the craft in orbit…we all liked that.
Venue: Woodford Park Leisure Centre, Haddon Drive, Woodley, RG5 4LY
So…continuing the theme of elegant engineering:
“The Portsdown DATV project provides an easy way to “get on air” with Digital ATV at relatively low cost. The Portsdown system enables amateur radio operators with little or no knowledge of Digital ATV to construct the hardware elements, load and configure the software and use the system to send live Digital ATV signals across town on their existing aerials. It includes the new Reduced Bandwidth modes and the ability to transmit to local repeaters using the more traditional 2 and 4 Msymbol DATV modes. Frequency coverage of 71 MHz, 146 MHz, 437 MHz and 23cms bands.”
Our very own Simon M0ZSU is also involved with the project and is
building one himself.
Noel and Brian Coleman G4NNS (who also gave us a talk on mapping
galaxies from your back garden using hydrogen line astronomy iirc!!) are now global super-stars after their appearance on Michael Portillo’s “Great British Railway Journeys” BBC programme using the Goonhilly 32m GHY6 dish for 3.4GHz and 5.6GHz EME operation.
Now RADARC members aren’t backward in coming forward so perhaps we can extract some stories about that too. There must be some.
If we ask nicely, Noel might also tell us about his web sdr which I find
very useful for monitoring:
Tea/coffee/biscuits (many thereof) as usual.
We just wanted to share this picture of the wonderful memorial to Graham G3XZJ made by his family (thanks Wally for the picture). It shows that radio was just one of his many and varied interests (and it sounds like he was expert in them all!). We shall all miss you Graham.
I found this great presentation about data modes from W6AER.
Our very own Rael Paster M0RTP will be with us next Thursday 25th January telling us all about the amazing things he’s done making and
using Magnetic Loop Antennas.
Venue: Woodford Park Sports Centre, Woodley, RG5 4LY
“Mag Loops” are physically small compared to a typical wire HF antenna. They can be of the order of a metre or so in diameter. If you’re stuck for space for antennas, this talk is for you. Fabrication materials include 28mm copper pipe so you’ll gain plumbing skills by having a go at building one.
For transmission, even with relatively low powers the currents and voltages circulating in the loop can become substantial so interesting
devices such as vacuum variable capacitors are useful for tuning.
The talk will include a description of the “mag loop
controller” (typically a small computing device or microcontroller such as an ‘arduino’ board) as this integral to ease of use as the loops need precise tuning.
Rael has used WSPR (Weak Signal Propagation Reporter) to great effect to map where he’s managed to radiate RF to – you’ll learn all about the possibilities there. (https://physics.princeton.edu/pulsar/k1jt/wspr.html)
All powered by tea and biscuits. Look forward to seeing you there.