GT6201
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DV 17001.03 Issue 4 01/2015
Page 37
3.3
Start-Up
CAUTION:
Do not switch ON the GT6201 VHF transceiver during engine start or shut-down
because excessive pulses on the DC bus of the vehicle may cause damage on
electrical circuits of any installed instrument.
a. Turn “ON” the VHF transceiver by turning the volume knob clockwise.
b. During PBIT the display indicates the message ”WAIT”, the software version of “Control Head”
(CH) and the software version of “Chassis Module” (GCM) are indicated.
c. If the PBIT has detected error(s), the display shows ”FAILURE” (for details see chapter 3.13).
3.4
Receive and Transmit Mode
3.4.1
Receive Mode
If /PTT1 and /PTT2 inputs are inactive, the transceiver remains in receive mode.
In receive mode the headphone(s) outputs (if enabled) provide a mixed signal consisting of:
•
Received signal from antenna,
•
Intercom signal from intercom circuit one and two,
•
Signal from auxiliary input.
In receive mode the speaker output (if enabled) provides a mixed signal consisting of:
•
received signal from antenna
•
signal from auxiliary input
The signal from the auxiliary input can be muted under certain conditions. For details refer to
chapter 3.10.
3.4.2
Transmit Mode
If /PTT input is active (PTT key is pressed) the transceiver switches to transmit mode.
Microphone(s) signals can modulate the transmitter.
•
PTT 1 input activates transmission from microphone path 1.
•
PTT 2 input activates transmission from microphone path 2.
•
If BOTH MIKES are active (enabled) in the installation setup, each input (PTT 1 or 2) activates
the transmission from both microphone paths simultaneously.
The “TX” symbol in the left upper corner of the display indicates the GT6201 is in transmit-mode.
In transmit mode several user actions such as changing frequency selection mode or channel
spacing mode, which are normally allowed in receive mode, are blocked. (As an exception in
standard mode the “Preset” frequency may still be changeable, even during transmission.)
Side-tone (demodulated audio of the emitted signal) is available on the headphone output. The
transmit mode automatically deactivates the speaker.
Note:
Transmit mode terminates automatically
(return
s
to receive mode) after 120
seconds of continuous tran
smitting
,
even if PTT is still pressed. In this case
“STUCK PTT” is indicated (refer chapter
). For initiation of a new
transmission, /PTT line first
needs to become inactive.