RT-100 Emergency Receiver
Page 5 of 11
(1) ON/OFF-switch of the RT-100 Emergency Receiver. After a short switch-on system
test the device is ready to operate. The green LED will flash when switched on.
(2) When operating a continuous self-diagnosis is executed. In case of detecting an
internal fault the red ERROR-LED will flash. The RT-100 Emergency Receiver is
not working properly anymore.
(3) The Mode-button is used for selecting two different modes of operation. The
selected mode will be stored lasting until a new change.
Normal
When switched to this mode the RT-100 Emergency Receiver works as a
normal receiver. Each received signal on the active frequency will trigger alert.
In case of an alarm always an acoustic check should be made, if it is either the
typical PLB/ELT howling sound or a false alarm caused by rare, but occurring,
short transmissions of pilots or strong disturbing signals.
PLB/ELT-Code.
In this mode alert will be triggered only if a PLB/ELT-code signal with typical
downsweep is received (criteria of recognition are listed in chapter Technical
Data). For triggering alert a certain receiving field strength is required fo
analysing and recognising the modulation. At the beginning of an alarm an
acoustic beep will be given 25 times as additional signal. (The display LED
“Special” has no function)
(4) The Freq.-button is used to adjust the active receiving frequency.
121.500 MHz
This is the international emergency frequency. All PLB/ELT emergency
transmitters are working on this frequency. A green LED indicates that this
frequency is active.
Test Frequency (see chapter “Technical Data”)
This second frequency is used only for testing purposes in combination with a
transmitter working on the same frequency, in order not to trigger alert at others
(e.g. SAR etc.). A red flashing LED indicates (also as warning) wether this test
frequency is activated.
(5) The Squ.-button switches the squelch-function (ON/OFF). This function is used
mainly for checking the receiver. If the green Off-LED is lit, the squelch is switched
off and an acoustic noise on the speaker can be heard. This function does not
affect the squelch level or triggers alert.
