Jerry,
ANS 1 >> under eng. spec. ( elec ) there's 2 types. namely comms and radar.

under comms u'll be repairng and maintaining signal sets

under radar u'll be repairing and maintaining Radar equpt.
as to the specified equpt.. u have to join to know..(mi 2 lazy)
ANS 2>> well this is a bit tough as it still hangs in the air. As it's still quite new, how they chose who can stay or leave is still quite unknown. to make it simple they say performance which is very vauge. Pes status is a definate issuse in this...
ANS 3>> How far u can advance as a dip?? currently is WO.............

Hope I have somehow ans some of your quest....
