Specifications

RADIO OPERATION
A complete set of operating instructions for the
MDX
UHF
radio are provided in Operator’s Manual.
In the conventional mode of operation, the user selects a
channel and communicates on that channel in the conven-
tional mode. A system refers to a set of channels and a chan-
nel is a transmit/receive radio frequency pair.
The exact operation of any radio depends upon the oper-
ating mode, the programming of the radio and the particular
radio system. Most features described in these operating in-
structions can be enabled or disabled through programming.
Both of these important factors must be considered when ad-
dressing the following instructions.
USER INTERFACE
Operating controls are located on the radio front panel
and microphone.
The Front panel
L
ight
E
mitting
D
iode (
LED
) display
provides radio status and communication control informa-
tion for the operator. The keypad is used for activation of
various features and functions.
Turning The Radio On/Off
The radio is turned On/Off by pressing the
PWR
button
in the upper left corner of the front panel. To turn the radio
OFF press the
PWR
button again.
SCAN OPERATION
The SCAN function allows monitoring of receive groups.
All scan functions are retained in memory, even if the 12
Volt battery is disconnected.
TO PROGRAM SCAN GROUPS
The selection of scan groups is front panel programma-
ble using the programmed flex key or the menu mode.
1. Confirm that the radio is turned on. If not, press the
POWER
switch.
2. If the SCAN indicator is lit, press and release the
SCAN switch to disable the scan function.
3. Select the desired group using the
CHANNEL UP
and
DOWN
switch.
4. Press the programmed flex key mapped to scan
add/delete to add the group to the scan list. The
S
indicator will be shown in the display to indicate
that the group is now in the scan program.
5. Repeat steps 2 through 5 for each group to be added
to the scan list.
DELETE SCAN GROUP(S)
1. Confirm that the radio is on. If not, press the power
switch.
2. If
SCN
indicator is lit, press and release the
SCAN
switch to disable scan function.
3. Select the desired group to be removed from the
scan list using the
CHANNEL UP
or
DOWN
switches.
4. Press the programmed flex key mapped to scan
add/delete until the scan indicator is off. This re-
moves the selected group from the scan list.
5. Repeat preceding steps 2 through 5 for each group
to be removed from the scan list.
REVIEWING THE SCAN LIST
1. Confirm that the radio is turned on. If not, press the
POWER
switch.
2. If the
SCAN
indicator is lit, press and release the
SCAN
switch to disable the scan function.
3. Select each group (one at a time) using the
CHAN-
NEL UP
or
DOWN
switch and confirm groups in-
cluded on the scan list. The scan indicator (
S
) will
light for each group programmed.
USING THE RADIO WITH SCAN
THE SELECTED GROUP
The SELECTED group is the group in the display when
scan is turned on by pushing the
SCAN
switch. When a sig-
nal is not being received, the radio reverts to this channel for
transmitting. When a signal is being received, the radio reverts
to this group for transmitting. When a signal is being received,
the radio can be PC programmed to either revert to the SE-
LECTED group or remain on the received group.
The SELECTED group does not necessarily have to be a
group in the scan list. The SELECTED group will be temporar-
ily entered into the scan list and scanned until the SELECTED
group is changed.
When scan is turned off by pushing the
SCAN
switch, the
radio will return to the SELECTED group.
DISPLAY
Channel Indicator
While no signal is being received, the channel indicator
will always show the
SELECTED
group. When an active
group is received, the channel indicator will show the received
group.
SCN Indicator
When the
SCAN
button is pushed, the radio will light the
SCAN
indicator and begin scanning.
TRANSMITTING WHILE IN SCAN
Transmitter operation in scan is determined by the PC pro-
gramming of the radio personality.
Off-Hook Scan Not Enabled (default):
With off-hook scan not enabled (normal default condition),
all scanning will stop when the microphone is placed off-hook.
The SCN indicator will flash to show all scanning has stopped.
If a signal is not being received when the microphone is placed
off-hook, the radio will transmit on the SELECTED group. If a
signal is being received when the microphone is placed off-
hook, the radio can be PC programmed (using the "
scan trans-
mit option
" to either stay on the receive group or revert to the
SELECTED group. When the microphone is placed back on-
hook, the radio will immediately start scanning, even if the re-
ceived group was still active.
Off Hook Scan Enabled:
With off-hook scan enabled, moving the microphone off -
hook will not affect scan operation. The radio will continue
scanning. If a signal is not being received, the radio will trans-
mit on the SELECT group. If a signal is being received, the ra-
dio can be PC programmed (using the "scan transmit group"
option) to either stay on the receive group or revert to the SE-
LECTED group when the microphone PTT is keyed.
PC PROGRAMMING SCAN OPTIONS
1. Scan Transmit Group:
SELECTED
group (default): The radio will always
revert to SELECTED group when the microphone
PTT is keyed or when the microphone is placed off-
hook (if off-hook scan is disabled). If signals not be-
ing received, the radio will transmit on the
SELECTED group.
2. Off-Hook Scan Enable:
NO:
(default): The radio will stop scanning and flash
the SCN indicator when the microphone is off-hook.
See the "scan transmit group" description above to
program where the radio will transmit.
YES:
The radio will continue scanning with the mi-
crophone off-hook. See the "scan transmit group" de-
scription above to program where the radio will
transmit.
PUBLIC ADDRESS OPTION
OPERATION
If the Public Address Option is present, the radio may be
used as public address amplifier. Press the programmed flex
key or scroll through the menu to select the PA option (Scan
must be off). The LED display will show "
Pub Addr
". When
the microphone is keyed, the radio no longer transmits, but al-
lows the microphone audio to feed the speaker. Adjust the
VOLUME for the desired level. Press the programmed flex key
or scroll through the menu a second time to disable the PA op-
tion. The display will return to normal channel display. Chang-
ing groups or turning on Scan will also turn the operation off.
The Public Address microphone audio normally feeds an
external speaker. An
ON/OFF
switch, which is mounted on or
near the radio, allows selecting either the internal or external
speaker for the receiver audio. The
ON/OFF
switch turns the
receiver audio on or off to the external speaker. This switch
still functions for the receiver audio with the PA option dis-
abled.
The following details how to add/delete groups using
the flex key mapped to scan add/delete. The alterna-
tive is to select "
SCAN A/D
" in the menu mode. Se-
lect the desired group using the "
-
" button and
add/delete group using the "
+
" button.
NOTE
LBI-33055
4