Embraer EMB145 Operation Manual page 2344

NAVIGATION AND
COMMUNICATION
2 - Select the desired ITU channel.
Rotate the left outer channel select knob in either direction until the
desired ITU band appears in the one or two left-hand digits in the
CHAN display. Next use the right outer channel select knob to
select the individual channel number within the ITU band (the two
right-hand digits in the CHAN display.
When the ITU channel numbers have been entered, the airplane
receive frequency will appear in the FREQ kHz display and the R
annunciator will be illuminated.
NOTE: Refer to a list of the ITU maritime radiotelephone channels
to see that the above incrementing and decrementing
changes are consistent with the actual ITU channel
numbers.
3 - Select the operating mode.
Pull out and rotate the left inner (PULL MODE) knob in either
direction to select between TEL SUP CAR or TEL PLT CAR mode.
When the mode has been selected, push the knob back in.
4 - Tune the antenna.
Momentarily key the PTT to initiate the antenna coupler tuning
cycle. A steady 1000-Hz tone will be heard in the headset or
speaker while the antenna coupler is tuning. Approximately
1-second after completion of the antenna coupler tuning cycle
(tuning cycle may require from 5 to 30 seconds), the 1000-Hz tone
will cease, indicating that the system is ready for use on the
selected ITU channel. Adjust volume (V) and squelch (S) controls
as desired.
When transmitting, the receive frequency and R annunciator in the
FREQ kHz display are replaced with the aircraft transmit frequency
and a T annunciator.
FAULT INDICATION
If the antenna coupler does not tune after approximately 35 to 40
seconds, the steady 1000-Hz tone will begin to beep, indicating a fault
has occurred. To clear the fault, simply rotate one of the
Frequency/Channel Select Knobs away from and then back to the
desired frequency or channel and initiate another tuning cycle by
momentarily pressing the PTT button. The 1000-Hz tone should again
be heard and then disappear at the end of the tuning cycle. If the
beeping recurs, try the clearing procedure a second time. If a fault is
still indicated, there is probably an equipment malfunction.
Page
2-18-21
AIRPLANE
OPERATIONS
MANUAL
Code
8 01
MARCH 30, 2001