Service manual

GPH Series VHF Radio Operation
 Page 3-9
3.4.2.2 Priority Mode B
With Switch C (priority) up and Switch B (scan) down, the radio can receive on
the knob-selected channel while sampling the priority channel. If the priority
channel becomes active, the priority indicator lights. The radio changes to the
priority channel and holds for the duration of the transmission
To reply to a message on the priority channel, turn the channel selector knob to
the priority channel, and then transmit.
With Switches B (scan) and C (priority) up, the radio scans until it locks on to an
active channel. The radio continues to sample the priority channel while listening
to the active scan channel. If activity occurs on the priority channel, the radio
overrides the active scan channel, changes to the priority channel, and holds for
the duration of the transmission.
To reply to a message on the priority channel, turn the channel selector knob to
the priority channel, and then transmit. Once activity has ceased on the priority
channel, the radio returns to scan operation.
3.4.2.3 Priority Mode C
With Switch C (priority) up and Switch B (scan) down, the radio samples the fixed
priority channel at the preset rate. If activity occurs on the priority channel, the
radio changes to the priority channel and holds for the duration of the
transmission.
To reply to a message heard on the priority channel, press the PTT switch. The
radio transmits only on the priority channel when Switch C (priority) is up. Once
activity has ceased on the priority channel, the radio returns to the receive
channel on the channel selector knob.
With Switches B (scan) and C (priority) up, the radio scans until it locks on to an
active channel. The radio continues to sample the priority channel while listening
to the active channel. If activity occurs on the priority channel, the radio overrides
the active scan channel, changes to the priority channel, and holds for the
duration of the transmission.
To reply to a message heard on the priority channel, press the PTT switch. The
radio transmits only on the priority channel when Switch C (priority) is up. Once
activity has ceased on the priority channel, the radio returns to scan operation.
3.4.3 Change The Priority Channel
The fixed priority channel can be permanently set or can be changeable. If the
radio has a changeable priority channel, use the following steps to make this
change.
1. Slide Switches B (scan) and C (priority) down.
2. Turn the channel selector knob to the channel you want to enter as the new
priority channel.
3. Press the
[PRI]
key. A short beep sounds and
PR appears in the display,
indicating that the displayed channel is now the priority channel.
CG- OFF-
SQ VOL
161
2
3
4
5
6
7
8
9
10
11
12
13
14
15
ABC