There is a list of standard fit outs applicable at the time it was compiled (52b-43-01 Airborne Radio Equipment Handbook 1943-04) but there were so many variations due to local requirements, as well as those items mentioned by
C
cvairwerks
, so it is only a rough guide for that particular time. Air to ground comms often had to work with the ground forces in the area so had to be compatible with whatever the army or navy or other nation or whoever else was in the area was using as the area standard.
Sometimes this was by fitting additional radios but in fighters there was often not enough room for the additional radio so something else had to come out. Some of these options were covered by TOs but many were just local mods.
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