[CW] OT: Antenna Radiation Efficiency

[D.J.J. Ring, Jr.]

Concerning antenna radiation efficiency.

I only have the suggestion that I learned a long time ago, but
unfortunately I don't have any scientific measurements to confirm it. It
very well may be my superstition but here it is. It's simple enough to try
but exhausting to try to measure and confirm.

N1EA Antenna Rule #1:

No part of the antenna shall touch or be within one foot (305 mm) of any
object conducting or non-conducting including leaves or tree branches
including antenna supports. For antenna supports I made a one foot
separation from the end of the antenna insulator at the end of the wire
antenna and the antenna support (building, tree, tower or PVC pipe) made
from Kevlar rope. Kevlar rope is my choice as it's thin diameter but quite
strong.

My friend and inventer Michael Laronda, WA1OMI measured using instruments
the impedance of the antenna while we moved the antenna away from objects
when the impedance of the antenna no longer changed, we noted that when
separation distance in all cases for conductors and most surprisingly
non-conductors was equal or greater than one foot all interactions with the
antenna stopped. Antennas that previously only performed poorly then
performed much better. As I said, only the measurement of how much
separation was needed to have the antenna no longer be effected by mutual
impedance was repeated and carefully measured. The efficiency improvements
were very significant but our notes have been lost long ago, but we just
made it a design parameter that no conductor or non conductor be within one
foot (305 mm) of any antenna except non-conducting support ropes which were
tied to the antenna end insulators. Branches and vegetation were just cut
away.

73

David Ring N1EA
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