Re: Ideas for cheap and effective loop antennas
I made a 30 cm diameter, two turn loop using RG8.toggle quoted messageShow quoted text
A 6.8 nF capacitor tunes it to 1.1 MHz. With one turn
on the primary and 18 turns on the secondary I see 50
ohms on 1.1 MHz.
The signal level is about 10 dB below what I see from
a 10 meter wire antenna - and that is enough with a margin
for a receiver with a low NF.
Suppression of conducted interference is poor however.
That is easy to fix - I will try to get the time to make
a video showing the nature of the problem and how to fix it.
The 30 cm loop when tuned to 1.1 MHz has a useful bandwidth
of about 500 kHz (with a low noise receiver.) Adding a very
simple amplifier would make the bandwidth MUCH larger.
A very good and cheap receiving loop antenna can be made from one turnWhy not rearrange the same one turn to achieve two turns with good shielding and balancing?