Thanks Mike,
There is a four way Hat switch on the throttle, which is like a push-to-talk button, instead it has four different positions for four different freq. If you get a chance can you ask him which one of the four they use when communicating with the LSO("calling the ball") and what direction that corresponds to on the Hat switch e.g. Push up with thumb for comm 1 on VHF 1, or push down with thumb for comm 2, hopefully it is easy to answer.
Thanks much,
CAPT