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→The game of minimum lost
When doing radio transmission, your devices tries to emit data over the air with electricity.
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.
{{dbox-orange| 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]).
'''The power lost is expressed in dBm''' (see [https://en.wikipedia.org/wiki/DBm dBm on wikipedia]).
[[Fichier:COMMON-CANSAT-ANTENNA-minimum-lost.png]]
[[Fichier:COMMON-CANSAT-ANTENNA-minimum-lost.png]]
{{dbox-orange| Power Lost also occurs in the antenna, the coaxial cable, the RF connector! }}
Wrong material or poor design can result is a power lost bigger than air transmission!
== Antenna connector ==
== Antenna connector ==