can you add more channels to an RC toy?
title pretty much says it, i know it will depend on the chip, but is it possible in any way? most of the ones i have are fairly cheap rc cars/helicopters

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The existing signal could be modified to carry more data, but that would mean hardware modification.
L
You need to know how they work, and finding out how your model does and fiddling with it etc could be hard.
You'd be better with 2 on different frequencies.
L
You'll need to make sure you have no cross talk problems, so hopefully the toy(s) involved are of the same ilk and can be channel switched to ensure no comm issues.
you will need access to a scope to see what is happening
one of the free PC sound card scopes will do.
or quickly... The 'reasonable' triangle has just collapsed.