PARAMP
2-(G)FSK radios are usually simplex, meaning they only transmit energy when there is information to send, because devices are sharing a single radio channel.
Modulators in GNU-RADIO transmit continuously.
This block allows the packet encoder to enable/disable the transmitter output power, so energy is only sent during the packet.
This adjusts the output power. This is same as constant parameter of multiply const block.
Normally 1.0 can be used, except when modulator sensitivity is approx >= 0.8 care should be taken in preventing overdrive of radio sink hardware. If modulation distortion is observed, level should be reduced using a GUI slider.
Abruptly changing power in a single step can produce broadband splatter, described at http://en.wikipedia.org/wiki/Pulse_shaping
Simple incremental ramping is sufficient to prevent splatter during enable/disable of power.
This block only operates on complex input and output type.