dBi?
 

For those who dislike, or are incapable of, theoretical analysis, how do
they
first create, and then measure, the output from an isotropic radiator?

dBi?
 

"gareth" wrote in message ...

For those who dislike, or are incapable of, theoretical analysis, how do
they
first create, and then measure, the output from an isotropic radiator?

I'm not sure what your question is.

But to create an isotropic radiator:
Assume that all power originates at a point, such that it can radiate
equally in all directions.

Then draw a sphere around the point at a radius of r and let the
calculations begin.

dBi?
 

On Thu, 3 Dec 2015 15:23:10 -0000, "gareth"
wrote:

For those who dislike, or are incapable of, theoretical analysis, how do
they first create, and then measure, the output from an isotropic radiator?

Easy. You build one and measure it:
http://802.11junk.com/jeffl/antennas/isotropic/index.html
It's not perfect for all polarizations, but it's close. The problem
is you have to put the transmitter inside the antenna or the
connecting coax cable will wreck the pattern. Oh wait... you don't
like theoretical analysis. Never mind.

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

dBi?
 

gareth wrote:
For those who dislike, or are incapable of, theoretical analysis, how do
they
first create, and then measure, the output from an isotropic radiator?

It is a theoretical calculation from the basic physics of electromagnetic
radiation.

It is physically impossible to build a true isotropic radiator, but one
can get close.

--
Jim Pennino

dBi?
 

"gareth" wrote in message
...
For those who dislike, or are incapable of, theoretical analysis, how do
they
first create, and then measure, the output from an isotropic radiator?



I am, in fact, challenging those who decry with rudeness theoretical
discussions,
but then talk about gains in dBi terms.

dBi?
 

gareth wrote:

"gareth" wrote in message
...
For those who dislike, or are incapable of, theoretical analysis, how do
they
first create, and then measure, the output from an isotropic radiator?



I am, in fact, challenging those who decry with rudeness theoretical
discussions,
but then talk about gains in dBi terms.

Your question was answered: It is a theoretical calculation from the
basic physics of electromagnetic radiation.

What is your problem with that?


--
Jim Pennino

dBi?
 

On 12/3/2015 1:24 PM, gareth wrote:
"gareth" wrote in message
...
For those who dislike, or are incapable of, theoretical analysis, how do
they
first create, and then measure, the output from an isotropic radiator?



I am, in fact, challenging those who decry with rudeness theoretical
discussions,
but then talk about gains in dBi terms.

It is just a reference, Gareth. That's all.

dBi?
 

On Thu, 3 Dec 2015 15:23:10 -0000, "gareth"
wrote:

For those who dislike, or are incapable of, theoretical analysis, how do
they
first create, and then measure, the output from an isotropic radiator?

Same question as:

HOW DO YOU FIRST CREATE AND THEN MEASURE ONE VOLT?

Has been done 100 years ago.
Only a few specialists care how to make reproduceable
physical calibration standards.


w.

dBi?
 

"Helmut Wabnig" [email protected] --- -.dotat wrote in message
...
On Thu, 3 Dec 2015 15:23:10 -0000, "gareth"
wrote:

For those who dislike, or are incapable of, theoretical analysis, how do
they
first create, and then measure, the output from an isotropic radiator?

Same question as:

HOW DO YOU FIRST CREATE AND THEN MEASURE ONE VOLT?

Has been done 100 years ago.
Only a few specialists care how to make reproduceable
physical calibration standards.

Weston Standard Cell, and then a potentiometer in the true sense ofthe
world,
marked off with a ruler?

(School 'A' level physics 1969)
)