DMH Owner’s Manual
21
NOTE:
If the radio is programmed for Dual Priority operation, only
Priority 1 channel can be changed with the
[PRI]
button.
NOTE:
A channel can be the priority channel even if it is on the Scan
List. Due to multiple sampling of the same channel, however, maximum
performance occurs when the priority channel is not on the Scan List.
UNIT-TO-UNIT CALLING
P25 Unit IDs allow for Unit-To-Unit calls when the radio is operating
in Digital Mode. The microphone’s
[*]
key must be enabled by radio
programming to allow this mode of operation. To view the radio’s ID,
press and hold the
[*]
key while not in Unit-To-Unit Mode. (Unit-To-
Unit Mode is indicated by a phone icon in the upper right corner of the
display). Channels programmed for analog only operation will not be
able to transmit or receive Unit-To-Unit calls.
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.
