Power Distance
Power Distance
Determining transmission distance over line of sight with only estimated power output at 2.4ghz?
Is there a way to estimate the transmission distance of a 3 watt, 2.4ghz transmitter while ignoring either antennas, assuming they have line of sight in optimum conditions?
You cannot determine with only the output power and frequency. You also need to know:
1) transmitting antenna gain
2) cable loss between transmitter and antenna
3) free space path loss
4) receiving antenna gain
5) cable loss between receiver and antenna
6) receiver sensitivity
7) allowable fade margin
Received Signal Strength (RSS) =
Tx output power - Tx cable loss + Tx antenna gain - Free space path loss - Rx antenna gain - Rx cable loss.
RSS is the strength of the signal at receiver. Note that Free space path loss included the term for distance traveled. This is what you are looking for.
Compare the RSS with the Receiver sensitivity. The difference between the RSS and the Receiver sensitivity is the Fade Margin. The lower the fade margin, the more susceptible the link is to errors due to bad weather, noise, etc. A good fade margin is 12 dB or higher.
Now with all of this, you can calculate the transmission distance from the free space path loss term.
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