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Get a good footswitch -- one that has two separate switches that actuate at slightly different times just a few milliseconds apart.  Wire the switch that closes first to the amplifier and the other one to the radio.

 

This way, the amplifier is turned on and ready just 5 - 10 msec before the radio can send any RF its way.  It's a lot easier on just about any amplifier to be keyed like this rather than having the radio keyed first and then sticking the amplifier into the mix.