Operation GPH-CMD VHF Radio
Page 3-12 BK RADIO
3.11 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 (Priority) up
• The Squelch knob in the Code Guard position (fully counterclockwise
detent position) 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.
3.11.1 DUAL PRIORITY SCAN
Up to two of the radio’s 500 channels can be designated as priority
channels. These two, PR1 and PR2, are periodically tested for activity, even
if a different transmission is being listened to. Activity on PR2 preempts
activity on any of the non-priority channels. Receptions on PR1 have priority
over any other channel, including PR2.
Either priority channel can be programmed as a fixed channel, tied to the
Channel Selector knob, or programmed OFF. If the radio is programmed to
transmit on the first priority channel, transmissions will occur on PR1 when
operating in Priority Scan Mode.
If PR1 is a fixed channel, and the [PRI] key is not locked out, the user can
use the keypad to change groups, if necessary, move the channel selector
to a new channel and press the [PRI] key to choose a new PR1 channel.
SCN
LABEL 3
PR SCN
LABEL
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