User's Manual

Operation DMH Series VHF Radio
BK RADIO Page 3-21
3.15.6.1 BUSY CHANNEL INDICATION
The yellow Busy Channel Indicator glows if there is carrier activity on the selected
channel. If the selected channel is a Channel Guard channel and the proper Channel
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 Channel Guard channels with the Squelch knob
in the Channel Guard position and activity has been detected, the Busy Channel
Indicator glows for the time period necessary to determine if the proper Channel
Guard value has been received. This will cause the Busy Channel Indicator to flash
at various rates.
3.15.6.2 BUSY CHANNEL LOCKOUT
The Busy Channel Lockout feature applies only to those channels programmed with
a receive Channel Guard value. When carrier activity is detected on the channel
selected, the radio checks the receive Channel Guard value. If the proper Channel
Guard value is present, the radio can transmit on that channel even if the CG button
is off.
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 Channel Guard
detent.
Channels not programmed with a receive Channel Guard value can be used to
transmit regardless of carrier activity.
3.15.6.3 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 pressing the CG button to disable receive Channel
Guard (an arrow will appear over the button). The transmitter is locked out only if the
CG button is off (no arrow above the CG button).