14 BK Radio
The display indicates Secure Operation as follows:
1. In Standby Mode, if the radio will transmit in
Secure Mode when PTT is pressed, the encrypt
icon flashes in the display.
2. When receiving or transmitting an encrypted
signal, the encrypt icon flashes in the display.
TRANSMIT KEY SELECTION
The radio can hold up to 32 DES or AES encryption
keys. Each channel is assigned a default key for
transmit. The key can be locked to the channel, or if
programming allows, a transmit key other than the
default key can be selected from the radio’s Key Pick
List. If a key is selected from the pick list, it will be
used during transmit on every channel that allows
selectable keys.
To access the Key Pick List, press the microphone’s
[FCN]
button. The display momentarily shows ‘
KEY
##
’, where ## is the number of the currently selected
transmit key, and then shows the key’s label. If no key
has been selected (default keys are being used), the
display shows ‘
KEY DFLT
.’ If the
[FCN]
button is
pressed again, the radio displays the first of any soft
switches assigned to the function menu (see page 15).
Press the microphone’s
[PRI]
button to step through
the list of key labels, or enter the number of the desired
transmit key. Press the
[ENT]
button to activate the
selected transmit key. Press “0” or the
[CLR]
button to
return to using default (pre-programmed) transmit keys
on all channels.
If a key is selected that has not been programmed,
when PTT is pressed, the radio will not transmit but will
beep and display ‘
NO KEY
’.
ZEROIZATION
The radio provides a method for the user to panic-
zeroize all encryption keys. This service also sets all
touchpad passwords to ‘FFFFFF’. The zeroization
service is invoked as follows:
DMH Owner’s Manual 27
UNIT-TO-UNIT MODE
When the radio is in Unit-To-Unit Mode, all scanning
functions will be disabled. The radio will receive and
transmit on the Ready-to-Transmit (RTX) channel only.
Depending on programming, the RTX channel can be
the main channel, a held scan or priority channel if
Talkback Scan is enabled, or the Priority 1 channel if
TX on PR1 is enabled. To alert the user that the radio
is in Unit-To-Unit Mode, a beep will periodically sound
until the unit is returned to normal Operating Mode.
If the RTX channel’s Digital Squelch Mode is set to
‘selective’, the radio will accept group calls, correctly
addressed Unit-To-Unit calls, and if RX Mode is set to
mixed, analog signals.
When a correctly addressed Unit-To-Unit call is
received, the radio will beep twice. If the calling unit’s
ID matches one of the Call List IDs, the associated
label will be displayed along with the RX and phone
icon. Otherwise, the numeric ID will be displayed
along with the RX, ID, and phone icon.
If the calling unit is not the same unit displayed before
the call was received, the calling unit’s ID will be
displayed for the duration of the reception. The
previously displayed ID will remain the default transmit
ID, but the interrupting ID will be captured as ‘last
active’. To speak to the interrupting caller, press
[*]
to
make the last active ID the new default transmit ID.
When a group call (or, if allowed, an analog signal) is
received, the radio will display the RTX channel’s label
for the duration of the reception.
If the RTX channel’s Digital Squelch Mode is set to
‘normal’, the radio performs as when the Squelch
Mode is ‘selective’, except all individual calls will be
received when the incoming NAC matches the
channel’s programmed receive NAC, not just individual
calls addressed to the unit. Individual calls not
addressed to the unit will be indistinguishable from
group calls. Only the channel label will be displayed,
not the ID of the calling unit.