Artsci takes into account
To properly estimate a signals range, you must have a few important figures:
-- Frequency / Band
-- Transmitter power (in watts)
-- Antenna height (from sea level)
-- Antenna gain (net after coax loss)

And that is what the original poster asked for (I thought)
--
73 From The Wilderness Keyboard

"Richard Harrison" wrote in message
...
Wilderness Keyboard wrote:
"See Guide to Transmitter Range from Artsci---."

See the 19th edition of the "ARRL Antenna Book" pages 23.5 and 23.6.

Eqn. 3:

Dmiles = 1.415 sq rt Hfeet

This can be rewritten:
D = sq rt 2H

Wasn`t it Albert Einstein who wrote something like: "Don`t make things
any more complicated than necessary?"

Solutions to Eqn 3 are plotted in Fig 6.

Example: 20 ft gives 6 miles. The approximate sq rt of 40 is 6 miles.

Example: 50 ft gives 10 miles. The approximate sq rt of 100 is 10 miles.

Example: 200 Ft gives 20 miles. The approximate sq rt of 400 is 20
miles.

Etc., etc., etc..

Best regards, Richard Harrison, KB5WZI

K1YW wrote:
"Artsci takes into account:
To properly estimate a signal`s range, you must have a few important
figures----

Frequency / Band
Transmitter power (in watts)
Antenna height (from sea level)
Antenna gain (net after coax loss)

As a practical matter, first you must have a line-of-sight path. Then
you can worry about path attenuation, gains, losses, transmitter power
and receiver sensitivity.

Attenuation between stations with an obstructed path (including earth
bulge) rises so rapidly with the obstruction that non of the other
factors matters except in the case of brute force communication, such as
atmospheric scatter.

Best regards, Richard Harrison, KB5WZI

Well -- the original post was from he asked:
"How far can a base two meter radio antenna transmit and recieve so as to be
'useable' when the antenn is 100 feet tall above the earth, and the
surronding area is fairly level. (no hills or mountains). I am
talking about a 50 watt base and 50watt mobil. If there is a formula
somewhere, would appreciate the input."

So Artsci should help him.

--
73 From The Wilderness Keyboard
--------------------------------------------------
"Richard Harrison" wrote in message
...
K1YW wrote:
"Artsci takes into account:
To properly estimate a signal`s range, you must have a few important
figures----

Frequency / Band
Transmitter power (in watts)
Antenna height (from sea level)
Antenna gain (net after coax loss)

As a practical matter, first you must have a line-of-sight path. Then
you can worry about path attenuation, gains, losses, transmitter power
and receiver sensitivity.

Attenuation between stations with an obstructed path (including earth
bulge) rises so rapidly with the obstruction that non of the other
factors matters except in the case of brute force communication, such as
atmospheric scatter.

Best regards, Richard Harrison, KB5WZI