RC receiver question
I need your help on this one: Above is the RC setup I'm planning to use in my next project. I extracted it from a wrecked RC plane I got my hands on. As you can see it's quite basic: a 4-channel receiver, speed controller + motor and servos. I know that each controller function corresponds to one of the four designated outputs on my receiver. You'll notice there's also another output port, labelled 6/B:
Does anyone know who to control its output from a standard four-channel transmitter? I just probed it with my multimeter's frequency counter and found that it outputs a steady 60Hz when the transmitter is on. Something tells me it has to do with those mysterious prefabricated mounting holes that I found:
Does this kind of transmitters have button and switch expansion capabilities? It would really help if I could turn this output on/off from my transmitter.
I eagerly await your responses !
EDIT: Here's a few pics of the inside: