How about if you get a field strength meter and walk away from the reference
antenna (like a vertical 1/4-wave) until you get a mid-range reading. - then
do the same with the tested antenna.
compare the distances - and note that signal strength is inversly related to
the square of the distance.
If the distance for the same reading is double for the beam - that means it
has 4 times the effective power in that direction.
then convert to db-gain



"Art Unwin KB9MZ" wrote in message
m...
Invariably when antenna gain is mentioned
questions arise as to gain measurement and accuracy there of.
I do a lot of antenna experiments and declarations of gain never get
any where.
Ihave now purchased a 27 Mhz electric model airoplane and am now in
the process of making a new design antenna and I intend to measure an
antennas
relative gain my comparing the distance travelled by the model by
usind a standard whip antenna and then by using newly designed
antenna.
I visualise keeping a record of distance travelled of my various
experiment antennas.
Does any body see any negatives about this aproach which will always
be done under zero wind conditions? I am looking for a real world
guide to gain to escape from the gain arguments of today.
Thanks in advance
Art


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