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(center), and VHF R (right) are installed. Any VHF radio can be controlled by any
TCP. The audio control panels are used to control voice transmission and receiver
monitoring.
VHF L is configured for voice communication only and VHF C is normally used
for data communication. VHF C and VHF R can be used for both voice or data
communication. However, only one VHF radio can operate in the data mode at a
time. ------- - X - ------- is displayed on the TCP when the affected radio (X) is
inoperative.
VHF Page Displays
Four VHF page displays are used to tune the left, center and right VHF radios. The
main VHF page (1/X) is always displayed when the VHF mode select key is
pushed. The main display controls the active and standby frequency selection for
all three radios. The selected radio for each TCP is indicated by ACTIVE and
STBY titles above large white text of the radio name (L, C, R) and the current
frequencies assigned. Pushing another active or standby line select key changes
the radio to be tuned.
For the selected radio, the frequency transfer switch moves the pretuned, standby
frequency to become the active, tuned frequency. The previously active frequency
then becomes the standby frequency.
New frequencies are entered into the scratchpad. Entering the decimal and/or
following zeros for this new frequency are optional. The decimal is inserted
automatically when the line select key is pushed. Scratchpad frequencies can be
enter into either the active or standby windows. If an invalid frequency is entered,
an INVALID ENTRY scratchpad message is displayed. Pushing the clear key
erases the INVALID ENTRY message and displays the previous scratchpad entry.
787 Flight Crew Operations Manual
Communications -
System Description
Boeing Proprietary 5.20.3
Alternate frequencies
VHF pages 2, 3 and 4 can contain up to eight alternate frequencies for all three
radios (24 total). These frequencies can be entered manually into the TCP by the
flight crew.
Alternate frequencies are accessed from the main VHF page by using the standby
frequency step control. Selecting UP or DN scrolls through the stored frequencies
for the active radio in the standby window. Once the desired frequency is
displayed in STBY, pushing the frequency transfer switch makes it active.
An alternate frequency can also be made active by first selecting it to the
scratchpad from any VHF page. On the main VHF page, it is then line selected to
the active radio position.
ATC Uplink
If an ATC uplink containing a VHF frequency is accepted, the uplink frequency is
displayed in the scratchpad preceeded by a UL indicator. Line selecting this
frequency into the active, standby or a stored position clears the scratchpad. It also
turns the uplink frequency green in the uplink data block.
Data Mode
The data mode can be selected and deselected by pushing the frequency transfer
switch when the word DATA is displayed on the active radio line. If the selected
VHF radio is the default data radio (VHF C), then DATA is displayed in the TCP
active frequency window.
When a standby frequency is transferred to the active DATA window, DATA is
now displayed in the standby window. If a new frequency is selected in the
standby window when DATA is displayed, DATA is replaced by the new
frequency. Data can be returned to the standby window by stepping through the
list of standby frequencies until DATA appears.
When a VHF radio is in the data mode, it is not available for voice
communications. A VHF radio can be returned to the voice communication mode
by transferring a voice frequency into the ACTIVE frequency window.
HF Communication System
There are two independent HF communication radios, designated HF L (left) and
HF R (right). Each HF radio can be tuned by any TCP from the main HF page.
Managing HF frequencies on the TCP is identical to VHF mode operation. Up to
three pages of alternate HF frequencies (24 total) can be stored in the TCP.
787 Flight Crew Operations Manual
Communications -
System Description
5.20.4 Boeing Proprietary
The HF radios operate in one of two modes, upper side band (USB) or amplitude
modulation (AM). The USB/AM key on the main HF page is used to toggle
between these two modes. In addition, the HF sensitivity is controlled by the HF
sensitivity keys. Pushing the sensitivity UP or DOWN keys increment HF
sensitivity between maximum (100) and minimum (0) volume.
The audio control panels are used to control voice transmission and receiver
monitoring.
When an HF transmitter is keyed after a frequency change, the antenna tunes
while a continuous or intermittent tone may be heard through the audio system. A
　
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