Editing Transmitter power output

{{More citations needed|date=May 2022}}{{short description|Power of a transmitter in watts or dBm}}

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In [[radio|radio transmission]], '''transmitter power output''' ('''TPO''') is the actual amount of [[power (physics)|power]] (in [[watt]]s) of [[radio frequency]] (RF) energy that a [[transmitter]] produces at its output.<ref>{{Citation |last=Morrow |first=Walter E. |title=CURRENT AND FUTURE COMMUNICATION SATELLITE TECHNOLOGY**This work was sponsored by the Department of the Air Force. |date=1977-01-01 |url=https://www.sciencedirect.com/science/article/pii/B9780080210537500203 |work=Space and Energy |pages=277–296 |editor-last=Napolitano |editor-first=L. G. |publisher=Pergamon |language=en |isbn=978-0-08-021053-7 |access-date=2022-05-02}}</ref>

TPO is a concept related to [[effective 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.{{Clarify|reason=ERP is a function of antenna gain. Please clarify what the relevance of frequency is for a brief description of ERP|date=June 2024}}

==Signal formula==
The [[radio antenna]]'s design focuses the [[radio wave|signal]], creating [[Antenna gain|gain]] and increasing the ERP. There is also some loss (negative gain) from the [[feedline]], which reduces some of the TPO to the antenna by both [[Electrical resistance and conductance|resistance]] and by [[radiant energy|radiating]] a small part of the signal.

The basic [[equation]] relating transmitter to effective power is: 

::<math>TPO\ \times\ loss_{feedline}\ \times\ gain_{antenna}\ =\ ERP</math>
Note that in this formula the Antenna Gain is expressed with reference to a dipole ([[Antenna gain#Figures used for antenna gain|dBd]])

== References ==
{{Reflist}}

==See also==
* [[Effective radiated power]]
* [[Nominal power]]
* [[Signal strength]]
* [[RF power margin]]

[[Category:Radio transmission power]]
[[Category:Wireless transmitters]]

{{wireless-stub}}