Calculation of Transmitted power at a distance from transmitter

[Lathas]

The oscillator output is about 3dBm, which is directly fed to an antenna with a gain of 3dBi, is there any way to estimate how far the signal would be transmitted in free space?

 

[Borber]

It will be transmitted to infinity. Your receiver sensitivity and it's antenna then determines max usable distance transmitter can reach.

 

[jiripolivka]

It will be transmitted to infinity. Your receiver sensitivity and it's antenna then determines max usable distance transmitter can reach.

If your system operates in a free space, the above holds. If there is ground, then depending on frequency the propagation may be affected by it, by the ionosphere, by antenna radiation pattern, and more.

 

[Electro nS]

The oscillator output is about 3dBm, which is directly fed to an antenna with a gain of 3dBi, is there any way to estimate how far the signal would be transmitted in free space?

use FRIIS EQUATION to determine at a distance the amplitude of the signal , then depending on the receiver sensitivity , the maximum transmission distance is determined