Pictures are of 2 versions of the ladder loop that we have built to date- a 20 meter loop (mine) and a 40 meter version which was built by KM6T.

The characteristics of the antennas are:

• drive loop made from twin lead
• formed into a circle and open ends connect:
  • one lead from both sides crossover
  • other 2 wires connect to tuning capacitor
• RF input applied with Ferrite core transformer
  • feed point should be opposite cap (90 degree OK)
  • 1 inch type 43 ferrite core suitable – place on 1 wire of twin lead (cut /insert/ reconnect)
  • wire used for drive/ferrite should be opposite to cap
  • loops tested with 100 watts SSB and power limit is determined by core and the cap
• capacitor can be RG213 (approx 30pf/foot
• online test are ongoing

Picture on the right shows KM6T drive with 2 ferrite cores (increases power handling). The core paases through one wire and note there is a shadow (not second wire) .

Not visible in the picture above is the use of a variable cap.