Designed on YO by N0AKC - all lengths are in inches
Column 1 is the title of each element. Just like the original, there is 1 Reflector, 1 Driven Element, and 3 Directors.
The gama-match does not need to be readjusted.
Column 2 is the element placement, with respect to the reflector (0.00). The reflector is placed about 1-1.5 inches from the end of boom.
Columns 3 & 4 are the element lengths. The A50-5 antenna elements are tapered, with a 3/4" tubing in the center and 5/8" element tips.
To attain the proper element lengths, slide the 5/8" element ends in or out of the fixed length 3/4" tubing. (True lengths have been rounded to the nearest 1/16")
Extending the boom The original boom length is 12 feet. The above element spacing requires a boom length of 16 feet.
The boom is constructed using 3 sections of 4' aluminum tubing. One of these sections needs to be replaced by an 8' section.
(Ex. The original center section is 50" of 1 3/8" tubing, .058 wall thickness. Replace it with an 8' length of the same diameter tubing.)