-
http://pa0fri.home.xs4all.nl/Ant/Act...enna%20eng.htm
It's a beautiful circle, I have springs and an anvil bending device but couldn't emulate that. Would a square of the same circumference be a good substitute?
What I've done already for lightweight VHF/UHF arrays is make them from fibreglass rod and fix self-adhesive copper tape round the rods. A llittle soldering with strips of real copper to join them and a copious quantity quantity of varnish and it's done.
How about 15mm polythene pipe in a circle with the aforementioned copper tape wrapped round? It's readily available retail here, sold as slug and snail deterrent for garden flowerpots.
-
Square will work just as well.
The copper pipe used here in that article is copper pipe on a roll 6 mters very soft copper pipe to install in homes because it is soft it is easy to bend.
I just use Ecoflex 15 coaxial cable i had left over 15 mm outside diametre and large core.
All my boxing projects are pcb one or 2 sides copper, easy to work on with plate scissors, or hacksaw, easy to solder using a 100 watt iron, easyy to work on making holes in it, and a coat of paint will do the job.
Loop is made, i changed the schematic to incorporate the a 78L06 on the pcb, feeding the amplifier with my 14 volt supply that feeds the loop i have now with homebrew amp, just the incorporated 78L06 now lowers the voltage on the INA to measured 5,5 volts as it was in the specifications of the amplifier.
That means a drop of 0.5 volts over the 33 Ohm resistor, or 15.15 mA running through the amp.
That is 83 milliwatts dissipation out of 400, a safe setting, leaving enough headspace.
Depending the weather i will change the loop this weekend and see what results it brings.
I plan to make another loop with the same idea as the current loop, 4 meters alu strip as antenna, and a dual ina 02186 amplifier each one amplifying one end of the loop as i do now with the BFW 16A transistors in long tailed pair diagram.
That one already gives good results now.
Enough to experiment ;)
