[bigdogrod]

i'm running 3 rx's off of 1 tx, but i only need like 4 proportional channels, the rest of the channels and switching are handled by my beier sound units.

but what I've done before with multiple rx's is to have 1 servo on the same channel for each rx that turns on or off the signal input wire, so you would have constant battery input, and channels 1,2,3,4 would be truck mode, and 5,6,7,8 could be crane mode, or if you need 1 channel to be both crane mode and truck mode, that's where the switch comes in. it only activates the rx when you need it. i ran 3 position switches so that i could have rx 1, rx 2 or both.