28 BK Radio
If Unit-To-Unit Mode is entered when the RTX channel
is programmed for analog-only transmissions,
pressing PTT will cause the radio to beep until PTT is
released.
The user must select a channel capable
of digital transmissions before placing a Unit-To-
Unit call.
If the RTX channel is programmed for
Mixed Mode transmit, transmissions will be made as
digital Unit-To-Unit calls while the radio is in Unit-To-
Unit Mode, regardless of the position of the ‘TX Digital’
switch.
INITIATING A UNIT-TO-UNIT CALL
To initiate a Unit-To-Unit call, press the microphone’s
[*]
key to enter Unit-To-Unit Mode. The label of the
last active (called or received) ID will appear on the
display.
If the last active ID was a Call List ID, its label will be
displayed along with the phone icon, otherwise the
numeric ID will be displayed along with the phone and
ID icon. If a label is displayed, press and hold
[#]
to
view the corresponding numeric ID.
To place a call to the displayed unit, press PTT. To
choose another unit, use the microphone’s keypad to
enter the desired call list entry (0 - 9), or press
[PRI]
repeatedly to cycle through all call list entries, or press
[#]
to manually key in a new ID (up to 7 digits). To re-
select the ‘last active’ ID, press the
[*]
key. Once the
new unit ID is selected or entered, press PTT to place
the call.
To exit Unit-To-Unit Mode, press and hold the
microphone’s [*] key.
RECEIVING A UNIT-TO-UNIT CALL
When a Unit-To-Unit call is received while the radio is in
normal Operating Mode, the radio will beep twice. The
display will show the ID of the calling unit. If the ID
matches one of the Call List IDs, the associated label
will be displayed along with the RX and phone icons.
Otherwise the numeric ID will be displayed along with
the RX, phone, and ID icons. The calling unit’s ID will
be displayed for the duration of the reception, and once
the signal goes away, for a programmed hold time.
DMH Owner’s Manual 13
MIXED MODE TALKBACK
If Mixed Mode Talkback is enabled, transmissions
initiated while hold time remains will be in the same
mode as the received signal, if the signal was received
on the Ready to Transmit (RTX) channel.
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. TX Mode on the RTX channel must be set
to
MIXED
.
While hold time after a reception remains,
transmissions will be in the same mode as the
received signal, regardless of the status of the ‘TX
Digital’ soft switch. As in Talkback Scan, the RTX
channel and receive annunciators will be displayed for
the duration of the timer.
The talkback timer can be cleared by making the held
channel invalid. For instance, if a scan channel is
being held, turn scan off.
SECURE OPERATION
The radio may optionally be configured for Secure
communication on channels operating in Digital Mode.
No encryption is available for analog channels.
The receiver automatically detects both clear and
secure signals.
The transmitter selects clear or secure operation
based on each channel’s programming. Digital
channels can be programmed to always transmit
encrypted, always transmit clear, or to select the
Transmit Mode with the ‘TX Secure’ switch.
If enabled by programming, a ‘Clear TX-mode Warning
Beep’ will sound whenever the radio transmits in Clear
Mode.
