Skip,
That is a great formula for theory - I vaguely remember it from my
electromagnetic fields course.
But how you measure it?
With practical measurement equipment, it is difficult to isolate to a
single plane.
That may be do-able with fully characterized equipment in a controlled
antenna field space or in an EMC lab, but it certainly is not practical
in a typical ham antenna installation - and even the radiation
resistance is not easily measured.
Antenna modeling done properly will provide a much more easily produced
result. Comparative results between different antennas can be obtained
from a reference pickup antenna, but that can only show the relative
performance, we still have to guess at the efficiency.
73,
Don W3FPR
On 9/9/2018 4:26 PM, Fred Jensen wrote:
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
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com
