There are many ways to send control signals to a robot's drive train using either just straight RC control or by talking to a Micro controller or a computer. It would be helpfull if you would be a little more specific.
For straight RC control. Well these guys have master'd that for just about anything with a range of up to 3000 feet. Check out the RFL forum
http://botleague.net/
If you want to talk to a BASIC Stamp micro controller with a Airplane Radio. That's pretty easy as well with a little programming and wiring.
Here is some PBASIC code for the Parallax Boe Bot that reads the receiver outputs (servo position commands) for just about all of the RC radios...
' ==============================================================================
'
' File......
' Purpose...RC CONTROL OF BOEBOT
'
' {$STAMP BS2}
' {$PBASIC 2.5}
'
' ==============================================================================
' ------------------------------------------------------------------------------
' Program Description
' ------------------------------------------------------------------------------
'Control A boe-bot using 2-Channel R/C
' ------------------------------------------------------------------------------
' Constants
' -------------------------------------------------------------------------------
state CON 1
' ------------------------------------------------------------------------------
' I/O Definitions
' ------------------------------------------------------------------------------
Ch1 PIN 12 ' Elevator channel used to drive forward and backward
Ch2 PIN 13 ' Aileron channel used to steer left and right
L_servo PIN 14 ' Left servo
R_servo PIN 15 ' Right servo
' ------------------------------------------------------------------------------
' Variables
' ------------------------------------------------------------------------------
steer VAR Word
drive VAR Word
R_Target VAR Word
L_Target VAR Word
' -------------
' Program Code|
' -------------
begin:
DO
PULSIN Ch1 , state , drive 'read receiver channel 1
PULSIN Ch2 , state , steer 'read receiver channel 2
R_Target = drive - 750 + steer
L_Target = 750 - drive + steer
PULSOUT L_servo , L_Target 'send signal to left motor
PULSOUT R_servo , R_Target 'send signal to right motor
PAUSE 10
LOOP
***********************************************
Now all you need is a BOE BOT...
http://www.parallax.com/ProductInfo/Rob ... fault.aspx