Saab 340B, Operation Manual, Page: 312 / 670

COMMUNICATIONS, UHF COM
Operation
Aircraft Operations Manual
4/6.2
O
PAGE 2
Apr 01/15
CONDITIONS NORMAL PROCEDURES
(Cont’d)
When the receiver is in the BOTH mode, the Guard (GD) and Main (MN) annun-
ciators come on.
If the guard channel is selected in preset mode or the guard frequency is se-
lected in manual mode, it is not possible to select the BOTH mode.
NOTE
2.5 PRESET OR
GUARD CHAN-
NEL PRO-
GRAMMING The control unit allows programming of up to 20 channels
1. CHAN button (COM control unit) PRESS AND HOLD . . . . . . . . . . . . . . . . . .
− Press and hold (about two seconds) the CHAN button until the top display
line contains either the letter “P” followed by the channel number, or “GdP”
for the Guard channel.
2. Channel selector TURN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
− Use the channel selector knobs to change the channel number.
3. MODE button PRESS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
− Momentarily press the MODE button until the frequency display begins to
flash.
4. Frequency selector SET FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
− Rotate the frequency selector knobs to select the desired receive/transmit
frequency (see 2.6). The display now indicates the desired receive/trans-
mit frequency.
Different transmit and receive frequencies (Semi − Duplex) may be pro-
grammed into every channel except the Guard channel. If the semi − duplex
operation is not desired, then the procedure is completed by momentarily
pressing the CHAN button or waiting 20 seconds.
If semi
− duplex operation is desired, then perform the following steps:
5. PUSH TONE button PRESS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
− Momentarily press the PUSH TONE button to designate the displayed fre-
quency as the transmit frequency.
6. Frequency selector SET FREQUENCY . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
− Rotate the frequency selector knobs to select the desired receive frequen-
cy. The display now indicates the desired receive frequency.
To program another channel, momentarily press the CHAN button until the
top display is flashing. Rotate the knobs to select the desired channel number.
(Cont’d)