Gringo, I'm afraid you do not understand how voltage regulation works. What happens is that the voltage to the working portion of the rf detectors and decoding is clamped via a control circuit (usually just a Zener and capacitor with proper resistor) and the voltage at that point in the circuit is held to the regulated voltage. All other parts of the circuit such as the servos see the full battery voltage at all times. If they did not regulate the voltage to the rf section you would have glitches all over the place due to the AGC voltage shifting every time a servo drew a spike of current or the load shifted suddenly.