What is the function of the switch which selects either SSB or CW-FM on some VHF power amplifiers?
Change the mode of the transmitted signal
Set the amplifier for proper operation in the selected mode✓Bonne réponse
Change the frequency range of the amplifier to operate in the proper segment of the band
Reduce the received signal noise
Explication
The switch does not alter the mode of the signal passing through, it reconfigures the amplifier itself, changing bias and transmit and receive switching timing so the amplifier suits a continuous-carrier mode such as CW or FM versus an intermittent linear mode such as SSB. The mode is determined by the exciter, not by the amplifier.