Service manual

GPH Series VHF Radio Operation
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3.2.3 Code Guard Operation
Code Guard™ allows one radio or group of radios to be selectively called within a system. If the radio has
been programmed with Code Guard, use the following receive and transmit instructions.
Code Guard™ is a trademark of BK Radio.
3.2.3.1 Code Guard Receive
Turn power on by turning the volume knob clockwise.
Select a Code Guard channel by turning the channel selector knob.
Adjust volume by turning the squelch knob clockwise until you hear noise. Set
the volume to a comfortable level, then turn the squelch knob counterclockwise
until the noise stops. (Threshold squelch setting)
Set Code Guard mode by turning the squelch knob off (counterclockwise) into
the Code Guard position. A message will be heard only when the proper Code
Guard value is received.
3.2.3.2 Code Guard Transmit
Before transmitting on Code Guard channels, monitor the channel by turning the
squelch knob clockwise, off the detent. If the channel is not busy, press and hold
the PTT switch.
Reset the squelch knob to the Code Guard position to receive only the messages
with the proper Code Guard value. During extended transmissions, the squelch
can be left open until the exchange has ended.
3.2.4 Channel Selection
Radios with more than 16 channels are separated into groups of 16 channels
each. Each group of 16 channels can be programmed to have an "individual
personality" with its own set of operational features.
The group/channel selector knob can be programmed by your dealer as a
channel selector, a group selector, or a custom group/channel selector.
A. Channel Selector
Knob positions 1-16 select channels in the group selected by the keypad.
1. Press
the
[#]
key on the keypad to display the current group number.
2. Press a number key for the new group number. Only valid group entries
will be accepted. For, example, if your radio only has five channel groups
programmed, digits greater than five will be ignored. When changing
groups, invalid entries will not be accepted, and the radio remains in the
previously selected group.
3. Press the
[ENT]
key or wait 5 seconds.
The radio returns to normal operation for the new group, and the
selected channel is displayed. All selected scanning and priority
functions affect only the channels in the group you are operating in.
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