With each of my 4-channel R/C radios (72 Mhz) I was able to implement 5th and 6th channels to the transmitter (as ON-OFF functions for landing gear, etc) with the simple addition of a toggle switch and a few resistors. Under the cover of all my "four channel" transmitters was actually a six channel transmitter in hiding. At least for all the transmitters I owned.
So when one of the transmitter channels is used for an ON-OFF function (flaps, landing gear, bomb bay, etc) there is probably an industry standard PULSE WIDTH that should be used for the On position and for the Off position. Does anyone here have experience with this who could tell me what the pulsewidths are for ON and OFF? And would this pulsewidth be different for newer radios?
The reason I ask is because if I were designing an aircraft accessory that was activated by a fifth channel (e.g. camera shutter) I could just use the industry standard pulsewidth to detect activation. Otherwise I would need to add an adjustment pot on my accessory board, which I really don't want to do.
Also, does anyone happen to know if a newer cheap 2.4 Ghz transmitter will be able to be modified the same way? (or are all the 2.4 Ghz radios already 6 channel?)
I am the Master, and technology my slave.