Extra-channel transmission limiting switch

A signal transmission system comprising:

• a power amplifier, configured to amplify a signal;
• an antenna port, controllably connectable by a switch in series to an output of the power amplifier, and configured to be coupled to an antenna;
• a load component, controllably connectable by the switch in series to the output of the power amplifier;
• wherein the switch is disposed between the power amplifier and the antenna port and the load, to selectively connect the load component or the antenna port to the power amplifier according to a first operational mode and a second operational mode, and wherein the first operational mode is a mode in which the power amplifier is electrically connected to the antenna port and disconnected from the load component, and the second operational mode is a mode in which the power amplifier is electrically connected to the load component and disconnected from the antenna port;
• and
• wherein the switch is configured to connect the load component to the power amplifier according to the second operational mode when the power amplifier reaches a first predetermined power threshold.