I again have to video our Ninjutsu club's event using my consumer Canon HF10 camcorder.
As I described in my question before the previous event, the instructor demonstrates a technique and then, when everyone is practicing the technique, the instructor walks around, correcting mistakes.
The instructor wears a mike (connected to a little box worn at belt level) transmitting to an amplifying system and through it to the speakers. During the demos the camera gets the audio through the air from the speakers (I hope my English is not too terrible here :) and everything is OK but when the instructor moves around he turns off the mike, people gather around him and I can't get clear audio. This is a pity because we miss the best parts, the corrections people could really learn from.
The suggested solution was to get all of the audio from the PA mixer, and when the instructor does his walkabout, to mute the signal to the speakers instead of muting the mic.
This, however, has two problems: First, a person would have to man the mixer, cutting off the sound to the speakers whenever the speakers should be shut off. Second, as the camera is moving around and is not stationary at the mixer, we would have to record the audio at the mixer and later sync it to the video - quite a lot of work.
So my question is: Is there a way to wirelessly route the audio directly from a microphone worn by the instructor to my camera's microphone input, without having to route it to the mixer, record it there and sync it with the video at later processing?