Monday, May 22, 2017

N4KGL Field Day Loop Antenna Refinements

On Sunday afternoon I spent some more time on my Field Day Loop. I measured it out and put the insulators at the right places. I also setup a feed point at the bottom center and the bottom corner. I made a 300-ohm jumper to the AH-4 tuner. I have not tested it with the AH-4 yet. Thanks to Myron WV0H for help with analysis of this antenna. 

This is a 100 ft wire loop 30 ft across by 20 ft high. The bottom wire is 10 ft above the ground. It is NVIS antenna on 40 meters and has 39 deg elevated lobes broadside on 20 meters when fed at the bottom center. It has low angle radiation on 20 through 10 meters when fed a the bottom corner. The three poles are strapped to angle iron driven in 1ft in the ground. The poles allow raising the loop in push-up fashion. It is designed to fit in a camp site without using trees or extending beyond the bounds of the camp site. I can use the Icom AH-4 tuner or a matching transformer with a tuner at the rig. The 300-ohm feedline and the tuner can be switched from bottom center to bottom corner.