G4A09:What is the purpose of delaying RF output after activating a transmitter’s keying line to an external amplifier?
Direct answer summary (2023-2027 NCVEC pool)
The official correct answer for G4A09 is To allow time for the amplifier to switch the antenna between the transceiver and the amplifier output.
The key fact is To allow time for the amplifier to switch the antenna between the transceiver and the amplifier output. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.