So, I've been throwing around the idea of doing all of my remote controlling through a laptop, via xbee. I'd really like to be able to cut out the conventional R/C system all together. A joystick or two attached to the laptop should provide ample control.

Thing is, good R/C remotes (which I dont have, and dont really want to buy) have pretty nice features for loading profiles, mixing channels, trimming, exponential controls, etc.

It should be possible to implement all of that in a fairly simple computer program...but it would certainly be nice if some or all of that already exists, particularly with a nice GUI. So if you know of anything resembling a Tx emulator out there, I'd really like to hear about it.

Thanks!

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OK, this is not exactly what you are asking about, but I have the PC/Tx adapter from Endurance RC which is an interface between the RC TX and the laptop allowing you to use your joystick as input.
Although this does not take the transmitter out of the loop, perhaps it is one step in the project.

It can also add more channells than you TX has... as many as the RX you have.
(ie. if you have a 9 chan Rx, the PCTx supports 9 channels, even if your Tx is only a 6 channel)
Actually...their ServoCommander software looks quite close to what I'm aiming for. The one potential issue with it is that I'd like to grab the output and relay it over xbee, not just send it out through a normal Tx. Possible, depending on how the program works.

Also, ideally I'd really like to find something open source (I know, probably asking for too much), to keep costs down and modify it to my needs, but thanks that really is a good lead.
Thanks peter, there's some really good info there. Looks like I'm not the only one who had this idea. Still nothing that's quite like what I was looking for, but this will definitely help on the hardware front, and it looks like at least one guy there might in the process of making a program that would give the level of control that I am after.

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