Service manual

GPH Series VHF Radio Operation
 Page 3-7
3.3.3 Change the Scan List
The radio can be programmed to enable the user to add or remove channels
from the scan list. If user changes are enabled, follow these steps to change the
scan list:
1. Slide Switches B (scan) and C (priority) down.
2. Select a channel to be added or removed from the scan list by turning the
channel selector knob. If the channel is already on the scan list,
SCN
appears in the display.
3. Press the
[ENT]
key to add a channel to the scan list. A short beep sounds
and
SCN
appears in the display.
4. Press the
[CLR]
key to remove a channel from the scan list. A short beep
sounds and
SCN
disappears from the display.
3.3.4 Fix the Scan List
See Scan List Lockout in Section 2 if you want to program the radio so that the
user cannot alter the scan list.
3.4 PRIORITY SCAN
Priority scan enables the radio to receive on any channel while monitoring for a
message on the designated priority channel(s). The radio samples each priority
channel at a preset rate (.25-2.0 seconds) regardless of activity on any other
channel. Priority scan operates only while the radio is not transmitting and can be
used in combination with scan operation.
When Switch C (priority) is up, the display flashes
SCN
. If a message is received
on a priority channel, the priority indicator lights, and the radio receiver locks onto
that channel for the duration of the transmission, unless a higher priority channel
interrupts.
Priority Scan can be used in combination with Code Guard with:
 Switch C up
 The squelch knob in the Code Guard position (off) and
 The priority channel(s) programmed with Code Guard
If a message is received on a priority channel, the radio receiver locks on to the
priority channel and checks to see if the proper Code Guard value is present. If
the signal contains the proper Code Guard value, the radio receives the
message. Otherwise, the radio will re-check the channel every 4 seconds, until
the activity on the channel ceases.
ABC
CG- OFF-
SQ VOL
161
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ABC