Abstract :
ELT (Emergency Locator Transmitter) is a device that emits hazard
signals automatically in the event of a violent crash or hitting, using the G-switch
as a crash sensor. Can also be manually turned on by the pilot using a remote
switch on the cockpit, in case of emergency or testing. This tool is designed to be
active in the event of crashes and emit signals that tell the position of self
(homing). The price yag expensive and not arbitrary may be used as an obstacle
to research.
Making ELT prototype is one of solution to do ELT research, because by
using this prototype ELT function can be represented, microcontroller is the main
controller of industry standard and current research, in addition to cheap price
microcontroller is now easier to use than microprocessor and software support
and documentation adequate.
In the ELT prototype there is a toggle switch that acts as a remote
switch that serves to provide power to the ELT prototype and there is a sw-420
sensor that acts as a G-switch to activate the device during a collision. The ELT
prototype consists of two modes: 406 modes which can transmit digital data over
433MHz frequency modulator with GFSK (gaussian frequency shift keying) and
121.5 modes that can transmit beacons over the modulated frequency of
136.111MHz ASK (Amplitude Shift Keying) modulation system, both modes can
operate for 22 hours with duration of 1 minute each mode, and can be displayed
for 406 mode on laptops then for 121.5 mode flare can be heard by HT as hazard
tone from ELT