Code Hopping; High Frequency - Directed Electronics Automate 553 Owner's Manual

Code Hopping

The receiver and transmitters use a mathematical formula called an
algorithm to change their code each time the transmitter is used.
This technology has been developed to increase the security of the
unit. The control unit knows what the next codes should be. This helps
to keep the transmitter "in sync" with the control unit even if you
use the remote control out of range of the vehicle. However, if the
remote has been pressed many times out of range of the vehicle,
or the battery has been removed, it may fall out of sync with the con-
trol unit and fail to operate the system. To re-sync the remote sim-
ply press several times within range of the vehicle. The alarm
will automatically re-sync and respond to the transmitters normally.

High Frequency

Your system transmits and receives at 434 MHz. This provides a cleaner
spectrum with less interference and a more stable signal. Enjoy a phe-
nomenal increase in range, even in areas with high radio interference.
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