It's the double integral of the power [watts] over all elevation angles
0 to Pi and all azimuths 0 to 2Pi divided by the power [watts]
dissipated in the radiation resistance at the feed point. This of
course assumes the antenna is over a flat, horizontal plane. ;-)
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
On 9/9/2018 12:39 PM, Bob McGraw K4TAX wrote:
How does one measure transmit antenna efficiency?
Bob, K4TAX
Sent from my iPhone
On Sep 9, 2018, at 2:36 PM, Mel Farrer via Elecraft <elecraft@mailman.qth.net>
wrote:
Great Don,
You and I grew up in the same time era......
Now, I am wiser and have more CRS,,,,, Anyway, Here is my take on antennas in general.
I have MANY that I can chose from at any time, HOWEVER, Some antennas "hear"
better even if they are not as efficient as my transmitting antenna. The crazy thing is
the good receiving antenna, when things get tough, are not the most efficient on
transmit. Does that make sense? I hope so.
Mel, K6KBE
From: Don Roberts via Elecraft <elecraft@mailman.qth.net>
To: "Elecraft@mailman.qth.net" <Elecraft@mailman.qth.net>
Sent: Sunday, September 9, 2018 12:27 PM
Subject: [Elecraft] ARRL book on receiving antennas
Having been a ham since 1956, I also agree from my experience, that I along
with every ham I knew, used the same antenna to receive and transmit. From my
first home brew one tube, through my first Globe Chief kit, through Globe
Scout, NCX3, and Globe GTX 550, all in the 50/s and into the 60/s, and all had
the same antenna for receive and transmit. I too, went from the dpdt knife
switch, to the Dow Key relay. My QSL collection confirms this for the stations
worked during that period.
73, Don W4CBS
Sent from Yahoo Mail on Android
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