Ericsson EDACS MDX Operator's Manual
LBI-38846B
Operator’s Manual
®
EDACS
MOBILE RADIO
MDX
ericssonz
TABLE OF C ON TENTS
Page
SAFETY INFORMATION . . . . . . . . . . . . . . . . . . . . 5
SAFE DRIVING RECOMMENDATIONS FOR USERS
OF MOBILE RADIOS . . . . . . . . . . . . . . . . . . . 6
OPERATING PROCEDURES . . . . . . . . . . . . . . . . . . 6
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . 8
CONTROLS, INDICATORS, AND DISPLAYS . . . . . . . . . 9
CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . 9
DISPLA Y INDICATORS . . . . . . . . . . . . . . . . . . 14
DISPLAY ALPHA INDICATORS . . . . . . . . . . . . . 14
Full Length Indicators . . . . . . . . . . . . . . . . . 15
Abbreviated Indicators . . . . . . . . . . . . . . . . . 15
ALERT TONES . . . . . . . . . . . . . . . . . . . . . . . . . . 16
ALL APPLICATIONS . . . . . . . . . . . . . . . . . . . . 16
EDACS APPL IC ATIONS . . . . . . . . . . . . . . . . . . 16
EDACS ALERT TONE SETS . . . . . . . . . . . . . . . . 17
Single Alert Tones . . . . . . . . . . . . . . . . . . . 17
Continuous Alert Tones . . . . . . . . . . . . . . . . 18
GE-MARC APPLICATIONS . . . . . . . . . . . . . . . . 18
OPERATING NOMENCLATURE . . . . . . . . . . . . . . . . 20
TRUNKED OPERATION (EDACS OR GE-MARC) . . . 20
CONVENTIONAL OPERATION . . . . . . . . . . . . . . 20
DEFINITION OF TERMS . . . . . . . . . . . . . . . . . . 20
Wide Area System Operation (Optional) . . . . . . . 21
ProSound . . . . . . . . . . . . . . . . . . . . . . 21
Telephone Interconnect . . . . . . . . . . . . . . . . . 21
BASE/UNIT OPERATION . . . . . . . . . . . . . . . . . 21
OPERATING THE RADIO . . . . . . . . . . . . . . . . . . . . 22
TURNING THE RADIO ON . . . . . . . . . . . . . . . . 22
NOTICE!
Repairs to this equipment should be made only by an authorized service
technician or facility designated by the supplier. Any re pairs, altera tions
or substitution of recommended parts made by the user to this equipment
not approved by the manufacturer could void the user’s authority to
operate the equipment in addition to the manufacturer’s warranty.
NOTICE!
This manual covers Ericsson and General Electric products
manufactu red and sold by Eric ss on Inc.
This manual is published by
typographical errors, inaccuracies of current information, or improvements to programs and/or equipment, may be made by
Ericsson Inc.
manual may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and
recording, for any purpose, without the express written permission of
Copyright© November 1992, Ericsson GE Mobile Communications Inc.
, at any time and without not ice. S uch changes wi ll be incorport ated into new edit ions of t his m anual. No part of this
Ericsson Inc.
2
, without any warranty. Improvements and changes to this manual necessitated by
Ericss on Inc.
TABLE OF CONTENTS (CON’T)
Page
SELECTING SYSTEM/GROUP/CHANNEL . . . . . . . 22
Group Selection . . . . . . . . . . . . . . . . . . . . 22
System Sel ection . . . . . . . . . . . . . . . . . . . 22
Channel Selection (Conventional System) . . . . . . 23
FRONT PANEL SQUELCH ADJUST MENT . . . . . . . 23
INTERNAL/EXTERNAL SPEAKER . . . . . . . . . . . 23
MICROPHONE PUBLIC ADDRESS OPERATION . . . 23
EDACS TRUNKED OPERATION . . . . . . . . . . . . . . . 24
PLACING A TRUNKED DISPATCH CALL . . . . . . . 24
MANUALLY E NTE RI NG A GROUP ID
(System Model Only) . . . . . . . . . . . . . . . . . . . . 25
RECEIVING AN EMERGENCY MESSAGE . . . . . . . 25
From The Selected Group . . . . . . . . . . . . . . . 25
From A Scanned Group . . . . . . . . . . . . . . . . 26
SENDING AN EMERGENCY MESSAGE . . . . . . . . 26
CLEARING AN EMERGENCY . . . . . . . . . . . . . . 26
SPECIAL CALLS . . . . . . . . . . . . . . . . . . . . . . 26
Placing A Telephone Interconnect Call
(On Systems Equipp ed With Interconnect Hardware) 27
Answering A Telephone Interconne ct Call . . . . . . 27
Placing A Special Call To Another Radio . . . . . . . 28
Receiving An Individual Call . . . . . . . . . . . . . 28
GROUP SCAN OPERATION . . . . . . . . . . . . . . . 28
Adding/Deleting To/From Scan . . . . . . . . . . . . 29
Starting Or Stopping Scan . . . . . . . . . . . . . . . 29
RECEIVING A CALL . . . . . . . . . . . . . . . . . . . 29
ENDING A CALL . . . . . . . . . . . . . . . . . . . . . 30
CONVENTIONAL FAILSOFT OPERATION . . . . . . . 30
MOBILE DATA T ERMINAL INTERFACE (OPTIONAL) 31
SCAN LOCKOUT MODE . . . . . . . . . . . . . . . . . 31
DATA LOCKOUT MODE . . . . . . . . . . . . . . . . . 32
STATUS OPERATION . . . . . . . . . . . . . . . . . . . 32
MESSAGE OPERATION . . . . . . . . . . . . . . . . . . 33
DYNAMIC REGROUP OPERATION . . . . . . . . . . . 33
Emergency Operation . . . . . . . . . . . . . . . . . 34
AEGIS OPERATION . . . . . . . . . . . . . . . . . . . . . . 34
VOICE MODES . . . . . . . . . . . . . . . . . . . . . . 34
CLEAR MODES . . . . . . . . . . . . . . . . . . . . . . 35
AEGIS DIGITAL MODE . . . . . . . . . . . . . . . . . . 35
Scanned Group Calls . . . . . . . . . . . . . . . . . 35
CONVENTIONAL OPERATION . . . . . . . . . . . . . 36
Outside Address . . . . . . . . . . . . . . . . . . . . 36
Channel Guard . . . . . . . . . . . . . . . . . . . . . 36
GE•STAR . . . . . . . . . . . . . . . . . . . . . . . 36
GE-MARC OPERATION . . . . . . . . . . . . . . . . . . . . 36
PLACING A DISPATCH CALL . . . . . . . . . . . . . . 36
RECEIVING A TRUNKED DISPATCH CALL . . . . . . 37
SPECIAL CALLS . . . . . . . . . . . . . . . . . . . . . . 37
3
TABLE OF CONTENTS (CON’T)
Page
Placing A Telephone Interconnect Call
(On Systems Equipped With Interconnect Hardware) . 37
Answering A Telephone Interconnect Call . . . . . . . 38
Placing A Special Call To Another Radio . . . . . . . 38
Receiving An Individual Call . . . . . . . . . . . . . 39
DIRECT MODE OPERATION . . . . . . . . . . . . . . . 39
CONVENTIONAL MODE OPERATION . . . . . . . . . . . . 40
RECEIVING A CALL . . . . . . . . . . . . . . . . . . . . 40
SENDING A MESSAGE . . . . . . . . . . . . . . . . . . 40
SCAN OPERATION . . . . . . . . . . . . . . . . . . . . . . . 41
SCAN SETUP . . . . . . . . . . . . . . . . . . . . . . . . 41
Starting Or Stopping SCAN . . . . . . . . . . . . . . 41
Adding/Deleting To/From SCAN . . . . . . . . . . . 41
RECEIVER SCAN RATE . . . . . . . . . . . . . . . . . . 42
USING THE RADIO WITH SCAN . . . . . . . . . . . . . 43
The Selected Channel . . . . . . . . . . . . . . . . . 43
Display . . . . . . . . . . . . . . . . . . . . . . . . . 43
Transmitting While In Scan: . . . . . . . . . . . . . . 43
Monitor (CLR) Switch Operation In Scan . . . . . . . 44
Channel Changes In Scan . . . . . . . . . . . . . . . 44
OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
TYPE 99 OPTION . . . . . . . . . . . . . . . . . . . . . . 48
ADDITIONAL ACCESSORIES (OPTIONS) . . . . . . . . 48
FREQUENTLY CALLED NUMBERS . . . . . . . . . . . . . 54
WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
OPERATING TIPS . . . . . . . . . . . . . . . . . . . . . . . . 56
4
SAFETY INFORMATION
The operator of any mobile radio should be aware of certain hazards
common to the operation of vehicular radio transmissions.
A list of possible hazards are:
1. Explosive Atmosp heres
Just as it is dangerous to fuel a vehicle with the motor running, be
sure to turn the radio off while fueling the vehicle. Do not carry
containers of fu el in t he tr un k.
2. Interference to Vehicular Electronics Systems
Electronic fuel injection systems, electronic anti skid braking systems, etc., are typical of the type of electronic devices that may
malfunction due to the lack of protection from radio frequency energy
present when transmitting. If the vehicle contains such equipment,
consult the dealer for the ma ke of the vehicle and enlist his aid in
determining if such electronic circuits perform normally when the
radio is transmitting.
3. Dynamite Blasting Caps
Dynamite blasting caps may be caused to explode by operating a radio
within 500 feet of the blasting caps. Always obey the "T urn Of f T wo
Way Radios" signs posted where dynamite is being used. When
transporting blasting caps in your vehicle:
a. Carry the blasting caps in a closed metal box with a soft lining.
b. Leave the radio OFF whenever the blasting caps are being put
into or removed from the vehicle.
4. Radio Frequency Energy
To prevent burns or related physical injury from radio frequency
energy, do not op erate the transmitter when anyone outside of the
vehicle is within two feet of the antenna.
5
5. Liquefied (LP) Gas Powered Vehicles
Mobile radio installations in vehicles powered by liquefied petroleum
gas with the LP gas container in the trunk or other sealed-off space
within the interior of the vehicle must conform to the National Fire
Protection Association standard (NEPA) 58 which requires that:
a. The space containing the radio equipment shall be isolated by a
seal from the space containing the LP gas container and its
fittings.
b. Outside filling connections shall be used for the LP gas container .
c. The LP gas container shall be vented to the outside of the vehicle.
SAFE DRIVING RECOMMENDATIONS FOR USERS OF MOBILE
RADIOS*
Read the literature on the safe operation of the radio.
• Keep both hands on the steering wheel and the microphone in its cradle
whenever the vehicle is in motion .
• Place calls only when vehicle is stopped. Use recall dialing to speed the
time it takes to call.
• When talking fr om a moving vehicle i s unavoid able, dr ive in th e slower
lane. Keep conversations brief.
• If conversation requires taking notes or complex thought, stop the
vehicle in a safe place and continue the call.
Whenever using a mobile radio ex er cise caution.
*As recommended by the AAA
OPERATING PROCEDURES
Two-way FM radio systems must be operated in accord ance with the rules
and regulations of the Federal Communications Commission (FCC).
Operators of two-way radio equipment must be thoroughly familiar with the
rules that apply to the intended type of radio operation. Following these rules
will help to eliminate confusion, assure the most efficient use of existing radio
channels, and result in a smoothly functioning radio network. When using this
two-way radio remember these rules:
6
1. It is a violation of FCC rules to interrupt any distress o r emergency
message. As the radio ope rates in m uch the same way as a telep hone
"party line", always listen to make sure that the line is clear - that no
one else in on the air - before sending messages. If someone is sending
an emergency message - such as reporting a fir e, or asking for help
in an accident - KEEP OFF THE AIR! Emergency calls have
priority over all other messages.
2. Use of profane or obscene language is prohibited by Federal law.
3. It is against the law to send false call letters, or a false distress or
emergency message.
4. The FCC require s that conversations be kept brief an d confined to
business. To save time, use coded messages whenever po ssible .
5. Using a radio to se nd pers onal me ssag es ( ex ce pt i n an e mergency) is
a violation of the FCC rules. Send only those messages that are
essential for business operation.
6. It is against Feder al law to repeat or otherwi se make kn own anything
overheard on the radio. Conversations between others sharing a
channel must be regarded as confidential.
7. The FCC requires the operator to identify himself at ce rtain times by
means of call letters. Refer to the rules that apply to the particular type
of operation for the proper procedure.
NOTE
The GE-MARC and EDACS trunking environments have auto matic
identification features built in and do not require the user to identify by
means of call letters.
8. No changes or a djustmen ts shall be made to the equi pment e xcept by
an authorized or certified electronics technician.
7
INTRODUCTION
This manual describes how to use the EDACS MDX Mobile Radio. The
MDX is a synthesized, microprocessor-based, high performance simplex
mobile FM radio providing reliable two-way communications in both the
GE-MARC and Enhanced Digital Access Communic ations System (EDACS)
trunking environments. If your MDX is equipped with the Aegis Digital
Voice or Encrypted Digital Voice option, the GE-MARC mode of operation is
no longer availa ble. T he ra dio also o perates with non-tr unke d or conve ntiona l
communications systems. Direct mobile to mobile communication, when out
of repeater ran ge, is also provided.
In an EDACS trunked environment the user selects a communications
system and group. In this mode, audio chann el selection is transp arent to the
user and is controlled via digital communication with the system controller.
This provides advanced programmable features and fast access to
communication channels.
In a GE-MARC trunked environment the user selects a communications
area and group. In this mode, audio channel selection is automatic and is
controlled via tone signalling.
In the Conventional mode, the user selects a channel and directly
communicates on that channel. In this mode, a system refers to a set of c hannels
and a channel is a transmit/receive radio frequency pair.
In either the EDACS or Conventional modes of operation the user can
program some or all of the talk gr oups or channels to transmit and receive Ae gis
Digital Voice or the highly secure Aegis VGE Encrypted Digital Voice. Aegis
is a high quality voice coding algorithm allowing for easy voice recognition.
The exact operation of the radio will depend on the operating mode, the
radio’ s progr amming, a nd the particul ar radio sys tem. Most fea tures desc ribed
in this manual may be enabled or disabled through programming. Consult the
system administrator fo r the particular fea tures that are prog rammed into yo ur
MDX radio.
8
CONTROLS, INDICATORS, AND DISPLAYS
The MDX Scan radio contains ten buttons, an eight character DOT
MATRIX display and seven indicators. The MDX System radio contains ten
buttons, an eight charac ter DOT MATRIX display and seven indicator s along
with a twelve button keypad. In addition, there are times when part of the eight
character display is used to display the radio status. Backlighting on buttons
illuminate Digital Legends.
CONTROLS
POWER Momentary push-push switch. Press once to turn
the radio ON. Press again to turn the radio OFF.
VOLUME The momentary switches (auto ramping) VOL-
UME + and VOLUME -. Beeps each time the
VOLUME button is pressed, except wh en a c all is
in process. Hold the button (up or down) to auto
ramp the volume.
MENU Momentary switch. The MENU button is used to
access options on the MDX mobile. Menu operation is coupled with the GROUP/SEL buttons and
the CLR button. To increment from one menu
selection to the next, simply press and release the
MENU button. Press the CLR button to return to
normal operation. The menu choices are listed
below with a description of how to change the
choices (Note: You may have some or all of these
menu choices progra mmed in y our rad io, and t hey
may be programmed in a different order than presented here).
SPECIAL CALL: Press the MENU button until
"SPC CALL" appears in the display. Pressing the
PTT causes the last selected special call to be sent.
To review or change the selection, use the
GROUP/SEL keys to view/change the special call
selection. Up to 25 phone numbers and individual
decode numbers can be stored in the Special Call
menu. While the desired number is displayed,
press the PTT switch to initiate the call.
BACKLIGHT: Press the MENU button until
"BRIGHT" appears in the display. To change the
state of the backlight press the GROUP/SEL + or
- button.
9
PUBLIC ADDRESS: Press the MENU button
until "PUB ADDR" appears in the display. Press
PTT to transmit in PA mode.
SCAN ADD/DELETE: Press the MENU button
until "SCAN A/D" appears in the display. Use the
GROUP/SEL- button to step through the group
selections for the current system. Use the
GROUP/SEL + button to change the scan state.
An "S" is illuminated to the right of the display if
the group/channel has SCAN enabled.
ALARM ON/OFF: Press the ME NU button until
"ALM ON" or "ALM OFF" appears in the display.
Press the GROUP/SEL + or - buttons until the
desired state is selected. (Note: This enables or
disables the external alarm; e.g. horn or lights.)
STATUS: Press the MNU button until "ST ATUS"
appears in the display. To review or change the
selection,use the GROUP/SEL keys to
view/change the selection of the status message.
When the desired status is displayed, press the PTT
switch to initiate the status transmission.
MESSAGE: Press the MNU button until "MES-
SAGE" appears in the display. To review or
change the selection, use the GRO UP/SEL keys
to view/change the selection of the message.
When the desired message is displayed, press the
PTT switch to initiate the message transmission.
SCN Momentary switch. Press the SCN button to en-
able or disable scan oper ation. The SCN indicator
will light when scan is enabled. Pressing and
holding the SCN button wh ile on a conventional
channel or an EDACS working channel will permit
the user to adjust the squelch setting from the front
panel by using the VOLUME ramp switch to open
and close the squelch.
10
CONTROLS AND INDICATORS
8-Character
Alphanumeric Dot
Matrix LED
allows you to identify
group and system
selections by
descriptive names.
Group/area/system
names, telephone
numbers, menu
options, and status
information are
displayed here.
PWR
MENU
access to functions
and options,
including
pre-programmed
telephone
interconnect and
individual radio calls;
scan add/delete for
modifying the radio’s
scan list (on EDACS
and conventional
systems); and alarm
on/off for the
external al arm option
that uses your horn or
head lights to signal
an incoming call.
Scan Button
button allows
Emergency ID/
Alarm (optional
sends an emergency
alert and identifying
code to the
dispatcher. If no
emergency function
is required, this can
be programmed as a
"HOME" switch.
)
VOLUME
Group/SEL
Ramp
System Switch
through the names of
systems and/or
channels programmed
into the radio,
displaying them on
the Dot Matrix display.
scrolls
Two Flex Keys
give you one-touch
access to the menu or
optional features.
Optional keycaps are
available to identify
the functions of
pre-programmed
buttons, including
Special Call, Scan
Add/ Delete, Public
Address, Home
System/Group,
External A larm , and
display brightness.
Front-Mounted
Microphone
Connector
easy access to the
microphone and
programming
capabilities.
Figure 1 - MDX Scan Radio
provides
Front Mount
Speaker
of audio. An optional
10-watt external
speaker is also
available, for use in
noisy environments.
with 4 watts
11
8-Character
Alphanumeric Dot
Matrix LED
allows you to identify
group and system
selections by
descriptive names.
Group/area/system
names, telephone
numbers, menu
options, and status
information are
displayed here.
MENU
access to functions
and options,
including
pre-programmed
telephone
interconnect and
individual radio calls;
scan add/delete for
modifying the radio’s
scan list (on EDACS
and conventional
systems); and alarm
on/off for the
external al arm option
that uses your horn or
head lights to signal
an incoming call.
button allows
Emergency ID/
Alarm (optional
sends an emergency
alert and identifying
code to the
dispatcher. If no
emergency function
is required, this can
be programmed as a
"HOME" switch.
)
PWR
VOLUME
Group/SEL
Ramp
System Switch
through the names of
systems and/or
channels programmed
into the radio,
displaying them on the
Dot Matrix display.
scrolls
Scan Button
Two Flex Keys
give you one-touch
access to the menu or
optional features.
Optional keycaps are
available to identify the
functions of
pre-programmed
buttons, including
Special Call, Scan Add/
Delete, Public Address,
Home System/Group,
External A larm , and
display brightness.
Front-Mounted
Microphone
Connector
easy access to the
microphone and
programming
capabilities.
provides
System Keypad
10-watt external
speaker must be used
with the System model.
12
Figure 2 - MDX System Radio
CONTROLS (CONT’D)
SYS Momentary switch. The SYS (S YSTEM) button is
used to select system changes. System may be
incremented by pressing and releasing the SYS
button. Alternately, when the display shows the
System name, the GROUP/SEL buttons may be
used to increment or decrement the system selections. (NOTE: The radio may be programmed with
wrap around on the system selection; this would
allow the radio to switch from the highest to lowest
system with one change instead of ramping all the
way through the list.)
GROUP/SEL Ramp Switch. Th e GROUP/SEL button is used to
increment or decremen t the curren t group/chan nel
selection. It is also used as described above to
increment/decrement the System. In co nventional
mode, these buttons change the channel selection.
CLR Momentary switch. The CLR button is used to exit
from the menu operation, monitor a conventional
channel or end a special/individual call.
HOME/
EMERGENCY
FLEX KEYS
A1, A2
NUMERIC KEYS
1-9, 0, *, #
Momentary switch. The HOME or EMER-
GENCY button is used to select a home system,
group, or channel. The radio may be programmed
to revert to a particular system and/or group/ channel within the selected or home system. I t may also
be programmed to send an emergency message
when pressed and held for approximately one second (either on the selected sy stem/group or on the
Home syste m/ g roup).
The aux buttons are used to access freq uently used
menu selections quickly. They can also be programmed as a HOME or Group/System, no Data
Toggle button, External Alarm, Public Address,
PriVaT e or Group ID entry.
On System radio, the twelve button keypad permits
telephone interconnect and DTMF overdial as well
as Group and Individual ID call entries.
13
DISPLAY INDICATORS
The radio’s display is shown below. The character line is used to display
system or ar ea an d g rou p or chann el na mes an d als o op erat io na l mes sa ges t o
the user. The line contains eight Dot Matrix LED characters. The 7 status
indicators are used to show the various operating conditions of the radio.
Figure 3 - Sample MDX Display
TX On indicates the radio is transmitting.
BSY Lights when a group is active (trunked system) or
when a channel is busy (conventional system).
Flashes when a ca ll is queue d on a trunked sy stem.
SCN ON indicates scan is enabled.
S ON indicates group/channel in scan list.
P1 ON indicates selected channel is a priority channel
(conventional only).
P2 ON indicates selected channel is a priority 2 chan-
nel (conventional only).
PVT ON indicates selected channel has been pre-pro-
grammed for Aegis operation. Flashes indicates
receiving an encrypted digital voice call.
NOTE
In EDACS operation the P1 & P2 indicators can be programmed to flash
when the radio has received an individual call. Display shows "C* to
show receipt of I-CALL.
DISPLAY ALPHA INDICATORS
The radio is capa ble of displayin g status indicato rs in the alph a display.
Some of these messages will use the entire display while others use only two
or three characters. When the short message is displayed it may be on the right
14
or left of the display (PC programmable). It is separated from the normal
information with an indicator such as an asterisk ("*").
Full Length Indicators
**INDV** Displayed when your unit receives an individual
call from another unit.
ID##### If programmed, displayed when your unit receives
an individual call where ##### is the unit ID of the
calling radio. (Note: If the ID is in your Special
Call list, you may choose to show an 8 character
name instead of the number.)
PHN CALL Displayed when your radio receives a telephone
call from the trunked system.
DATACALL Displayed when your radio is involved in a data
call.
*NO DATA D isplaye d when yo ur r adio is in the data disa bled
state.
* NC * Displayed when no control channel is fo und on a
trunked system.
ALL CALL Displayed when receiving a system wide call.
*AGENCY* Displayed when rec eiving an Agency Call.
*FLEET* Displayed when receiving a Fleet Call.
EMERGNCY Displayed steady when oper ator de clares an emer-
gency (optional), flashes when another user de-
clares an emergency.
BOOT DSP Displayed at power on in radios equipped for Aegis
operation. Indicates initialization of Digital Voice
Module.
LOAD KEY Displayed when VGE encryption keys are being
uploaded to the Digital Voice Module.
Abbreviated Indicators
F* Displayed on radios defi ned in the PC pr ogrammer
as supervisory when the trunked system is in fail-
soft mode. (Note: In failsoft mode, trunked dis-
patch operations is fully operational but
interconnect may not be possible.)
15
C* Displayed when an individual call has been re-
ceived and not answered. By selecting Special Call
in menu mode, the call can be recalled for return at
a later time. (Note: The call is not saved through
a power cycle.)
E* Displayed when an active voice call on a trunked
system is in an emergency state.
ALERT TONES
The EDACS MDX radio generates a set of unique alert tones to indicate
operating status. The following section identifies and describes the alert tones
used in the MDX radio for Conventional, GE-MARC, and EDACS
applications.
ALL APPLICA TIONS
SELF CHECK
TEST ALERT
One beep is sounded after the radio is turned on to
indicate that the radio has passed the self diagnostic
test. Optional in PC programmer.
EDACS APPLICA TIONS
CALL
ORIGINATE
ALER T
If programmed, a short to ne is so unde d whenever
the Push-To-Talk (PTT) button is keyed and the
radio has acquired a channel. This tone indicates
the user may be gi n c om munications.
AUTOKEY When the PTT is keyed to place a call on the
system, but the PTT is released before getting to
the channel (e.g. a queued call), the radio automatically keys on the channel when it gets the assignment. The radio generates a long beep and holds
the transmitter keyed for two seconds. Pre ssing the
PTT button keeps the channel and sends the message before this two second time-out has expired.
OUT OF RANGE/
SYSTEM
INOPERATIVE
A single low pitched tone will sound immediately
after the PTT switch is keyed indicating the radio
is out of range of the repeater. The radio tries to
place the call for a short period (3 seconds) after
the initial attempt. The radio generates a second
low pitched tone when it gives up trying to p lace
the call. The system is off the air or the radio needs
servicing when the radio is within calling range,
and these tones are heard.
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CALL RECEIVED If programmed, a single alert tone sounds when a
group call is received and a two tone alert (one high
followed by one low tone) is sounded for an indi-
vidual call.
CALL DISABLED
ALERT
You will hear a continuous low pitched tone when
your radio is set to an Rx (decode) only
group/channel and you press PTT on the micro-
phone. This tone indicates that you are not allowed
to place a call on this setting.
CARRIER CONTROL
TIMER
The Carrier Control Timer alert is a low pitched
tone you will hear whenever you have kept the
PTT button continuously pressed for a pre-pro-
grammed leng t h of t ime. Four warning beeps pre-
ceed the tone and transmitter shutdown. The
transmitter shuts down when the steady low
pitched tone starts, interrupting communications.
To maintain communications, release and re-key
the microphone. This resets the timer and turns the
transmitter back on. The CCT is a built in precau-
tion against extende d use of the system.
EDACS ALERT TO NE SETS
There are two EDACS alert tone sets: single and continuous. The EDACS
MDX radio can be programmed to use either set .
Single Alert Tones
CALL QUEUED If one short, high pitched tone sounds after the
transmitter is keyed, it indicates the system has
placed the re qu es t i n a qu eue. Thi s tone sou nd s at
both the transmitting and receiving end that a call
is forthcoming. If the PTT is unkeyed while in the
queue, the radio will automatically key push-to-
talk when a channel becomes available (see
AUTOKEY).
SYSTEM BUSY I f you key the PTT bar and hear three sh ort, me-
dium pitched tones, it indicates that the receiving
party is alre ady on the syste m or the system is busy
and its queue is full. Y ou must re-key later to access
the system.
CALL DENIED A single low pitch beep will sound when the PTT
switch is keyed and the request is denied by the
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