INSTALLATION MANUAL OPERATION MANUAL INSPECTION LOG
KANNAD 406 AF-COMPACT
PAGE: 101
FEB 01/2008
SYSTEM FUNCTIONAL DESCRIPTION AND OPERATION
1. Transmitter Functional Description
A. Transmission
The KANNAD 406 AF-COMPACT can be activated either automatically when
the crash occurs (thanks to a shock sensor) or manually (thanks to a switch on
the transmitter itself or on the RC200 Remote Control Panel).
The KANNAD 406 AF-COMPACT is designed to transmit on two frequencies
(121.5 and 406 MHz). The 121.5 Mhz is mainly used for homing in the final
stages of the rescue operations. The 406 MHz frequency is used by the
COSPAS-SARSAT satellites for precise pinpointing and identification of the
aircraft in distress.
Once activated, the transmitter operates continuously on 121.5 MHz with an
output power of 100 mW. The modulation is an audio frequency sweeping
downwards from 1420 Hz to 490 Hz with a repetition rate of 3 Hz. The AM
modulation factor is over 85%.
During operations, a digital message is transmitted on 406.028 MHz every 50
seconds. The output power on 406 MHz is 5 W.
Bi-phase modulation at 400 bps enables transmission of all relevant
identification information to the COSPAS-SARSAT satellites in 440 ms.
