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Inradio transmission,transmitter power output (TPO) is the actual amount ofpower (inwatts) ofradio frequency (RF) energy that atransmitter produces at its output.[1]
TPO is a concept related toeffective radiated power (ERP), but refers to the power output of a transmitter, without accounting for antenna gain.The ERP for VHF/UHF transmitters is normally more than the TPO, for LF/MF transmitters it has nearly the same value, while for VLF transmitters it may be less.[clarification needed]
Theradio antenna's design focuses thesignal, creatinggain and increasing the ERP. There is also some loss (negative gain) from thefeedline, which reduces some of the TPO to the antenna by bothresistance and byradiating a small part of the signal.
The basicequation relating transmitter to effective power is:
Note that in this formula the Antenna Gain is expressed with reference to a dipole (dBd)
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