A couple of years ago we produced a switching unit, the RCMUX16, which had similar functionality to the Model Control Devices (MCD) SWITCH 8/16 units. We had a lot of problems with the whole keypad concept. Either users could not wire them into their transmitter correctly, or setup the RCMUX16 correctly and we had several kepads fail in the field requiring replacements to be sent out (which we did very promptly, by the way). They were also a real pain to manufacture in the first place. Because of the manufacturing and customer support issues, we threw in the towel on keypad operated devices and stopped making them.
However, I now have an alternate product proposal to make. Our latest SFX6 sound system uses a switching method that does not rely on a keypad or any TX modifications.
It uses a single on/off TX channel (or you can still use a proportional stick channel if you want). It relies on toggling the TX switch N times to switch on output #N. Then to switch off output N you would do the same thing. Alternately, you can toggle the switch N-1 times and then switch it on, and hold it on, and the output would switch on for as long as the switch is in the ON position and then switch off when the switch is released. A spring loaded switch is ideal for this purpose.
This automatically gives you either a latched action (as in the first case) or a momentary action (as in the second case).
Although this toggling action is not as convenient as having a dedicated push-button for each switched output, it does have the immense benefit of not requiring a keypad at all, or any tranmitter modifications of any kind. It also does not require any calibration, nor any DIP switches to set latched or momentary action.
There is a practical limit to the number of outputs that can be supported in this way. I'd say 8 is the maximum as the operator has to remember the number of times they have toggled the switch, whilst also operating the model.
I am seeking feedback as to an 8 output switching unit based on this switching principle. If I get a good sense that there is sufficient demand for such a unit then we would be prepared to design and manufacture them.
Looking forward to your feedback - David.