User Manual

12 BK Radio
CHANNEL GUARD TRANSMIT
1. Turn the Squelch knob on (clockwise) and
monitor the Channel Guard channel before
transmitting, or, if Busy Channel operation is
enabled, check the yellow LED.
NOTE: Do not transmit if the channel is
busy.
2. Press the PTT switch. When the transmitter
is on, the red Transmit Indicator glows and
TX appears in the display.
3. If monitoring the channel,
reset the squelch
knob
to the Channel Guard position to
receive only the messages with the proper
Channel Guard value. During extended
transmissions, the squelch can be left open
until the exchange has ended.
MIXED MODE OPERATION
The receiver and transmitter are capable of
operating in analog wide-band (25 kHz
channel spacing), analog narrow-band (12.5
kHz channel spacing) and APCO Project 25
Digital Mode.
Each channel’s Receive and Transmit Mode
can be set independently as follows:
Mode RX TX
Analog Receive qualified
analog signals
only
Transmit analog
signals only
Digital Receive qualified
digital signals
only
Transmit digital
signals only
Mixed Automatically
receive qualified
analog or digital
signals
Transmit analog or
digital signal,
depending on the
status of ‘TX
Digital’ soft switch.
Digital receptions and transmissions will be
indicated by illuminating the ‘ID’ annunciator in
addition to the ‘RX’ or ‘TX’ annunciator.
Analog
Operation
RX
C
H
1
2
TX
C
H
1
2
Digital
Operation
RX ID
C
H
1
2
TX ID
C
H
1
2
Busy Channel
Indicato
r
DPH Owner’s Manual 33
TIME-OUT-TIMER
The transmit Time-Out-Timer limits the
duration of calls and guards against
accidentally locking on the transmitter and
tying up the radio system. Your dealer can
program the duration of the Time-Out-Timer
(15–225 seconds, or disabled).
BUSY CHANNEL
If the radio has been programmed for Busy
Channel operation, it will operate in one of the
following three Modes:
• Busy Channel Indication
• Busy Channel Lockout
• Busy Channel Lockout Override
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.