Folks,
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
Time: 8pm
“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.
73
John
G4RDC
Simon Watson