On 10/21/21 2:20 PM, john@kk9a.com wrote:
I would like to put up an isotropic antenna and compare it to my Yagis.
Yes, you could power your measurement system with a perpetual motion
machine as well.
The Hairy Ball Theorem says that building an isotropic antenna is
impossible. (https://en.wikipedia.org/wiki/Hairy_ball_theorem )
Hence, you build a standard gain antenna, the gain of which is
calculate-able from dimensions and materials.
A dipole is easy, and fairly straightforward to calculate the gain
(including ohmic losses). As is a "short dipole".
Or, you build 3 antennas and do a three cornered hat.
The antenna range literature is full of practical solutions.
Free space gain measurements of large antennas is difficult. I have
seen some herculean efforts toward that end (promulgated by people who
should know better).
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|