Fw: Re: [Antennas] Rotary Joints for Ladder Line

[Cletus W Whitaker]

de WB2CPN  South Central Pennsylvania USA  2002.04.28

It was the ARRL Handbook of 1947 or 1948 that showed how to make the
loop coupling between the rotary beam and a balanced line.  200 Ohm
heavy duty twin lead for commercial receiver facilities was in use at
the time.  The two loops were approximately 14" in diameter, made of 
copper tubing, and spaced approximately 1/2" from each other.  I never
did believe it would work, but a couple of guys in our shop put one on
the rotary beam we had.  I don't remember what happened, but it came
from the ARRL Handbook.        73   Clete