Interference signal detection in model radio remote control system - involves blocking transmitter between series of commands, and connecting receiver tuned to transmit frequency to transmitter antenna

摘要

The frequency of the interference signal is identical with the transmission frequency used for controlling the model. The control system transmits to the model receiver in cyclical sequence frequency or amplitude modulated carrier control commands split in individual channels. The system transmitter carrier frequency signal is blocked for a specified period (Tu) after transmission of a control command corresponding to the last channel and before scanning the first channel command. An additional receiver near the operator, tuned to the system's transmit frequency, is switched on and connected to the transmit antenna. When interference signals are preset, an alarm is tripped.