12 BK Radio
CHANNEL GUARD TRANSMIT
1.
Monitor the channel, before transmitting on
Channel Guard channels, by lifting the microphone
off hook or pressing the
[MON]
button. Listen to
the channel for a few seconds to ensure that no
communications are occurring on the channel.
2. Press the PTT (Push-To-Talk) switch on the
microphone. The TX annunciator appears on the
display and the red Transmit indicator illuminates
while the PTT is pressed. Talk in a normal voice
with the microphone approximately one to two
inches from your mouth. Release the PTT switch
to stop transmitting.
3.
Hang up the microphone when finished. If you
pressed the
[MON]
button to monitor the channel,
press it again after the transmission to return to
Channel Guard operation.
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.
DMH Owner’s Manual 29
When the hold time expires, the display will return to the
normal Operating Mode display, but the phone icon will
flash until the microphone’s
[*]
key is pressed, putting
the radio in Unit-To-Unit Mode, displaying the last active
ID.
UNIT-TO-UNIT CALLBACK
If Unit-To-Unit callback is enabled, and a Unit-To-Unit
call is received on the Ready-to-Transmit (RTX)
channel, the user may press PTT before the hold time
expires, causing the radio to enter Unit-To-Unit Mode
and transmit using the received ID as the destination
ID. If the callback timer expires before PTT is pressed,
the radio will return to normal Operating Mode, but the
phone icon will flash until the [*] key is pressed,
bringing up the last active ID.
To exit Unit-To-Unit Mode, press and hold the
microphone’s [*] key.
The callback timer can be cleared by making the held
channel invalid. For instance, if a scan channel is
being held, turn scan off.
PROGRAMMING UNIT-TO-UNIT CALL LIST
Press the microphone’s
[*]
key to bring up the last
active ID. If the last active ID was a Call List ID, the
ID’s label will be displayed along with the phone icon.
Otherwise, the ID number will be displayed along with
the phone and ID icon.
Press a number key (0 – 9) to go directly to the desired
Call List ID, or press
[PRI]
repeatedly to cycle to the
label of the ID to be re-programmed. Press and hold
the
[FCN]
key to enter ID Programming Mode (
PRG
icon will be illuminated). As in keypad Programming
Mode, normal radio function will be disabled until ID
Programming Mode is exited.
PROGRAMMING A LABEL
Press the
[CLR]
key. The display becomes blank.
Press number keys to enter 0-9 in positions 1-7. The
digits start in position 7, then move left.
