I agree!
But it's worth noting that the gain of a beam, referenced to a dipole at
the same height, varies with take-off angle; so how much louder you will
be on your beam compared to a dipole in exactly the same position will
vary depending on what path you are working.
Over real ground you typically only get close to the Free Space dBd
figure at very low elevation angles; at higher angles the gap closes.
Steve G3TXQ
On 01/10/2013 21:18, Jim Brown wrote:
The dB reference was for a dipole mounted at exactly the same point as
the beam. The result is particularly useful, because "ground gain"
(that is, the addition of the ground reflection to the direct signal)
is cancelled out.
I see this as a particularly useful way to present the data -- that
is, it answers the question, "if I replace my dipole with X beam, how
much louder will I be?" And they also answer the question, "how does
X beam compare with Y beam under the same conditions?"
73, Jim K9YC
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