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→The game of minimum lost
== The game of minimum lost ==
== The game of minimum lost ==
When doing radio transmission, your devices tries to emit data over the air with electricity.
As you can easily figure out, the air is a very poor electric conductor!
That results a significant portion of the power is lost in the air. '''The power lost is expressed in dBm''' (see [https://en.wikipedia.org/wiki/DBm dBm on wikipedia]).
dBm provides a relatively intuitive way to express the power level/power lost of a signal.
[[Fichier:COMMON-CANSAT-ANTENNA-minimum-lost.png]]
[[Fichier:COMMON-CANSAT-ANTENNA-minimum-lost.png]]