Small transmitting loop review

I saw a recent ‘maker’ video describing a small transmitting loop for 40m.

The loop used a 3m length of 19mm copper pipe formed into a circle, and at the gap where the ends almost meet, a tuning capacitance is synthesised using coaxial cable.

Screenshot - 15_02_2014 , 12_06_57

Above is a screen shot from Reg Edwards loop design program. It calculates the radiation resistance at 0.005Ω, loss resistance of the loop at 0.035Ω, capacitance to resonate it of 206pF (Xc=108Ω), and a bandwidth of 3.2kHz.

Continue reading Small transmitting loop review