Service manual

GPH-CMD VHF Radio Operation
BK RADIO
Page 3-17
3.13.6.1 BUSY CHANNEL INDICATION
The yellow Busy Channel Indicator glows if there is carrier activity on the
selected channel. If the selected channel is a Code Guard channel and the
proper Code Guard value is not detected, the Busy Channel Indicator
remains on for the duration of the carrier activity and no message is heard.
During Scan and Priority Scan operation, the Busy Channel Indicator glows
when activity is detected on any channel on the Scan List.
When scanning or priority scanning Code Guard channels with the Squelch
knob in the Code Guard position and activity has been detected, the Busy
Channel Indicator glows for the time period necessary to determine if the
proper Code Guard value has been received. This will cause the Busy
Channel Indicator to flash at various rates.
3.13.6.2 BUSY CHANNEL LOCKOUT
The Busy Channel Lockout feature applies only to those channels
programmed with a receive Code Guard value. When carrier activity is
detected on the channel selected, the radio checks the receive Code Guard
value. If the proper Code Guard value is present, the radio can transmit on
that channel, even if the Squelch knob is in the Code Guard position.
If the radio detects an incorrect value or carrier activity only, the transmitter
is disabled. If an attempt is made to transmit, an alert tone will be generated
and the display will show the word BUSY until the channel becomes
available or the PTT switch is released, whether the Squelch knob is in or
out of the Code Guard detent.
Channels not programmed with a receive Code Guard value can be used to
transmit regardless of carrier activity.
3.13.6.3 BUSY CHANNEL LOCKOUT WITH OVERRIDE
This mode operates in the same manner as Busy Channel Lockout except
that the user can override and transmit by turning the Squelch knob off the
Code Guard detent. The transmitter is locked out only if the Squelch knob is
set to the Code Guard detent.
BUSY