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Appendix
Antenna concepts and Installations
I.1. Basic Terminology
- Transmit Power
The RF power coming out of the antenna port of a transmitter. It excludes the signal loss of the
coaxial cable or the gain of the antenna, and is measured in dBm, Watts or milli-Watts
- Receiver Sensitivity
The weakest RF signal level (usually in negative dBm) that a radio needs to receive in order to
demodulate and decode a data packet without errors.
- Antenna Gain
The ratio of how much an antenna increases the RF signal over a specified low-gain radiator.
Antennas achieve gain by focusing RF energy.
- EIRP
Equivalent Isotropically Radiated Power is the power actually radiated by the antenna element. It
takes into account the antenna gain.
EIRP (dBm), performance of transmitting system
= Total Output Power of device – Cable Loss + Antenna Gain
Free Space Loss (FSL)
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