On Mon, 31 May 2010 18:39:11 -0400, Fred McKenzie
wrote:

It consisted of two 6 Volt dial lamps connected to each
end of a section of twin lead. I think it was two or three feet long.
The whole thing was taped to the transmission line. There was a
connection at the center of this on one side to one side of the
transmission line.

Hi All,

This and Myron's reference appear to fill in all the blanks and should
brush away the cobwebs.

What is described above appears to be that of a directional coupler. I
would suspect that the connection between it and the line is through a
capacitor, and the line proximity serves the inductive coupling. I
also presume the "transmission line" was also twin line, otherwise
none of this would work. The action of the directional coupler is
what separates the forward and reflected energies.

73's
Richard Clark, KB7QHC