This manual covers Ericsson and General Electric products manufactured
and sold by Ericsson Inc.
NOTE
Repairs to this equipment should be made only by an authorized service
technician or facility designated by t he supplier. Any repairs, alterations 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!
The software contained in thi s device is copyrighted by Ericsson Inc.
Unpublished rights are reserved under the copyright laws of the United
States.
This manual is published by
ments and changes to this manual necessitated by typographical errors,
inaccuracies of current information, or improvements to programs and/or
equipment, may be made by
Such changes will be incorportated into new editions of this manual. No part
of this 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
This manual describes how to use the EDA CS M-RK
II Portable Radio. The M-RK II is a synthesized, microprocessor-based, high performance portable FM radio
providing reliable two-way communications in both the
Enhanced Digital Access Communications System
(EDACS) trunking environment and conventional c ommunication systems.
In the EDACS or trunked system mode, the user
selects a communications system and group. In this
mode, channel selection is transparent 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 the conventional mode, the user selects a channel
and directly communicates on that channel. In this mode,
a system refers to a set of channels. A channel is a
transmit/receive radio frequency pair.
The exact operation of the radio will depend on the
operating mode, the radio’s programming, and the particular radio system. Most features described in this
manual may be enabled or disabled through programming. Consult the system administrator f or the particular
features that are programmed into the M-RK II.
7
USER INTERFACE
The M-RK II operating controls are located on the
radio’s front, top and left panels. A 15-button keypad,
liquid crystal display (LCD) for radio status information,
microphone and speaker are on the front panel. The top
panel houses a rotary SYSTEM/GROUP/CHANNEL
knob, POWER ON-OFF/VOLUME control knob and a
protected red EMERGENCY button. An OPTION b utton,
CLEAR/MONITOR button and the Push-To-Talk (PTT)
button are all located on the left side panel. The Universal
Device Connector (UDC) is located on the right panel
and is used while programming the radio and for accessory connection.
The keypad is used for manual number entry for
individual calls, access to a telephone interconnect system, and activation of various EDACS or conventional
features such as menu selection or scan operations.
The display has two, eight-alphanumeric-character
lines used to show the operational mode of the radio. 15
status indicators, used to indicate various operating conditions such as transmitter on, channel busy, scanning,
or low battery, are located above and to the right side of
the character lines within the display. A back light illuminates the display and the keypad for nighttime use.
8
POWER ON-OFF
/VOLUME knob
SYSTEM/GROUP
/CHANNEL knob
Antenna
Display
OPTION button
CLEAR
/MONITOR BUTTON
Push-To-Talk
(PTT) button
Battery latch
Battery
Figure 1 - M-RK II Portable Radio
M-RK
Universal
Device
Connector
(UDC)
MNU
1
4
PVT
STS
7
PHN
✱
3
2
ADD6
5
DEL
9
MSG8
#
0
DISP
IND
Keypad
SCN
GRP
SYS
Speaker
9
SYSTEM/GROUP
/CHANNEL knob
POWER ON-OFF
/VOLUME knob
5
4
6
3
2
16
15
OFF
7
8
91
10
11
1214
13
MAX
Antenna
OPTION button
CLEAR
/MONITOR button
Push-T o-Talk
(PTT) button
Battery latch
Figure 2 - Top And Partial Left Panel Views
10
EMERGENY
button
BUTTONS AND KNOBS
This section describes the primary function of the
button and knob controls. Other functions associated
with these controls are detailed in later sections.
SYSTEM
/ GROUP
/ CHANNEL
KNOB
PO WER
ON-OFF
/ VOLUME
KNOB
Selects systems or groups/channels
(depending on programming). This is
a 16 - position rotary knob. See SYSTEM/ GROUP/CHANNEL SELECTION for details.
Applies power to the radio and adjusts the receiver’s volume. Rotating
the control clockwise out of detent
applies power to the radio. A single
alert tone sounds (if enabled through
programming) to indicate the radio is
operational.
Rotating the control clockwise increases the volume level. Minimum
volume levels may be programmed
into the radio to prevent missed calls
due to a low volume setting. While
adjusting the volume the display will
momentarily indicate the volume
level (i.e. VOL = 31). The volume
range is from a minimum programmed level of zero (displa y ed as
OFF in the display) up to 31 which is
the loudest level.
11
EMER-
GENCY
BUTTON
Provides single button emergency
channel access. See the EDACS and
conventional emergency sections for
more details.
OPTION
BUTTON
CLEAR/
MONITOR
BUTTON
PUSH-TO-
TALK BUT-
TON (PTT)
(1) Programmable per system.
(2) Perf orms the backspace function
during data entry. In Phone and Individual Call modes the OPTION button can be used to recall the last
phone number or radio ID entered.
Serves several purposes depending
on the operating mode. In trunked
mode, the CLEAR/MONITOR b utton
exits the current operation and removes all displa ys associated with it.
The radio and display then return to
the group receive state. In c onventional mode, pressing this button unmutes the receiver so activity on the
selected channel can be monitored.
When pressed and held for approximately 3 seconds, this button toggles
conventional channel decoding/encoding (Channel Guard, Digital
Channel Guard, T99) on and off if
programmed for the selected channel.
Enables the radio’s transmitter. Releasing PTT returns the radio to the
receive mode.
12
KEYPAD
The keypad layout is similar to a standard telephone
keypad but with three additional buttons at the top for a
total of 15 keys . In addition to numbers, most of the keys
have special functions and are labeled as such using a
symbol or abbreviated word describing its primary function. Numeric entry is a secondary function of the keys.
Each key is described below.
MNU
SYS
1
PVT
4
STS7
PHN
✱
Figure 3 - M-RK II Keypad
Primary function - changes the sys -
∧
tem or group/channel (depending on
∨
programming); secondary function changes to a selection for items
within a list. Press
creasing order,
ing order. To auto-ramp press and
hold the key .
GRP
2
5
MSG8
DISP0
∨
to scroll in decreas-
SCN
3
ADD6
DEL9
IND#
∧
to scroll in in-
13
14
MNUPrimary function - accesses the
menu list. This is a list of additional
features that are not available directly from the keypad. See MENU
for details. Secondary function - activates a selected item within a list. After the menus list is accessed, select
∧
a menu item from the list via
or
and activate it with this ke y . Once activated, MNU continues its secondary function for activating a selected parameter setting until the radio returns to its normal receive
state. This is similar to an enter key .
SYSUsed to directly access systems via
the keypad and to access system selection in increasing or decreasing
order, or to select a set (bank) of systems for SYSTEM/ GROUP/CHANNEL knob selection (depending on
programming). See SYSTEM/
GROUP/CHANNEL SELECTION
for details.
GRPUsed to directly access groups via
the keypad and to access group selection in increasing or decreasing
order, or to select a set (bank) of
groups for SYSTEM/GROUP/
CHANNEL knob selection (depending on programming). See SYSTEM/
GROUP/CHANNEL SELECTION
for details.
∨
STSThe Status key is used to send a pre-
programmed status message to the
EDA CS site .
SCNToggles scan operation on and off.
When the radio is scanning, is
on and all groups or channels in the
scan list of the currently selected
system are scanned.
SCN
ADD
DEL
MSGThe Message key is used to send a
PHNUsed to place a telephone call
INDUsed to call an individual or make an
DISPInverts the display’s two alphanu-
Adds or deletes selected groups or
channels from the scan list of the currently selected system. See the
trunked and conventional scan sections for details.
pre-programmed status message to
the ED ACS sit e.
through the radio by selecting the
telephone interconnect special call
function. See Telephone Interconnect Calls for details.
all-call by selecting the individual call
special call function. See Individual
Calls for details.
meric character lines for viewing
from above; useful when the radio is
attached to the user’s belt.
15
DISPLAY
The radio’ s display is shown belo w. T he two character
lines are used to display system, group and channel
names and also operational messages to the user. Each
line contains eight alphanumeric character blocks. The
15 status indicators are used to show the various operating conditions of the radio. If the display back-lighting
is programmed on, the display will illuminate for a short
period when any of the controls are operated.
Line 1
Line 2
Figure 4 - M-RK II Display
The two display lines can be inverted to permit easy
viewing if the radio is worn on a belt or placed into a
vehicular charger . Press DISP once to invert the character lines, press DISP again to return to the normal display.
Refer to the MENU section to change the display’s contrast.
16
Messages
During radio operation, various messages are displayed on either line one or line two. Typical messages
include control channel status information, such as system busy or call denied, or messages associated with the
radio’s operation, (i.e. volume or contrast adjust). These
messages are described below.
Message NameDescription
QUEUED
SYS BUSY
DENIED
Call Queued
System Busy
Call Denied
Trunked mode
-
only. Indicates
the system has
placed the call in
a request queue.
Trunked mode
-
only. Indicates
the system is
busy, no channels are currently
available, the
queue is full or an
individual call is
being attempted
to a radio that is
currently transmitting.
Trunked mode
-
only. Indicates
the radio is not
authorized to op-
17
erate on the selected system
CC SCAN
WA SCAN
TALKARND
Control Channel Scan-Trunked mode
only. Indicates
the control channel is lost and the
radio has entered the Control
Channel Scan
mode to search
for the control
channel.
Wide Area Scan
Trunked mode
-
only. Indicates
the control channel is lost and radio has entered
the Wide Area
Scan mode to
search for a new
system (if enabled through
programming).
Talk-around
Conventional
-
mode only. Indicates the radio is
operating on
conventional
channels in talkaround mode (no
repeater).
18
*RXEMER*
Receive Emergency-Trunked mode
only . Indicates an
emergency call
is being received.
This message
will be flashing
on line two.
*TXEMER*
VOL = 31
LOW BATT
Transmit Emergency-Trunked mode
only . Indicates an
emergency call
has been transmitted. This message will be
flashing on line
two.
Volume Level
Indicates the cur-
-
rent volume le vel.
The volume level
display ranges
from OFF (silent)
to 31 (loudest).
Battery Low
-
Indicates the battery level is too
low for transmission. This message displays
when pressing
PTT and transmitting is disabled due to the
low battery condition.
UNKNOWN
Unknown ID
19
Trunked mode
-
only . Indicates an
individual call is
being received
by an unknown
radio ID. This bypasses when the
call is updated.
TX DATA
RX DATA
DATA OFF
DATA ON
20
Transmit Data
Receive Data
Data Off
Data On
Trunked mode
-
only. Indicates
when a data call
is being transmitted. Displayed on
line one.
-
Trunked mode
only. Indicates
when a data call
is being received.
Displayed on line
one.
-
Trunked mode
only. Indicates
when radio is in
data disable
state. Displayed
on line one.
Trunked mode
-
only. Indicates
when radio is
toggled to data
enable state. Dis-
played on line
one for two seconds.
KEY ZERO
PVT DIS
FRCD PVT
NO KEY #
Key Zero
Private Disabled
Forced Private
No Key Number
Indicates that
-
cryptographic
keys have been
erased from radio memory .
Indicates that the
-
group or channel
is not programmed for private mode operation.
Indicates that
-
group or channel
is pre-programmed for private mode operation and clear
mode is not possible.
-
Indicates that the
correct cryptographic key is not
loaded for the selected group or
channel.
21
Status Indicators
The 15 status indicators show the various operating
characteristics of the radio. The indicators show operating modes and conditions as follows:
SVCTrunked mode only .
ON - indicates the radio is in an EDACS
service area and is in communication with
the site controller via the control channel
(CC).
FLASHING - indicates the EDACS is in the
failsoft mode (if enabled through progr amming).
OFF - indicates the radio is out of range or
the control channel is not available.
CGConventional mode only.
ON - indicates Channel Guard encode/decode is enabled on the selected conventional channel.
BATON - indicates the battery pack’s charge is
low and needs recharging.
PVTPrivate
22
ON - indicates the group or channel is enabled to receive encrypted messages.
FLASHING - indicates an encrypted
transmission is being received.
BSYChannel Busy -
In trunked mode:
ON - indicates the radio is transmitting
or receiving a call on the working channel.
FLASHING - indicates a call has been
queued.
In conventional mode:
ON - indicates a call is being received.
WHCWho Has Called (trunked mode only)
ON - indicates an individual call has been
received, but not responded to . The indicator turns OFF if the individual call mode is
entered, the system is changed or the radio is turned off and back on.
SPCON - indicates the radio is in the special
call select/entry mode (Individual or Telephone Interconnect).
HION - indicates the selected group or chan-
nel is selected to transmit at high power .
OFF - indicates the selected group or
channel is selected to transmit at low
power.
XMITON - indicates the radio is transmitting.
When operating in a trunked system, the
radio may be programmed to automatically transmit (without pressing PTT) to
maintain digital communication with the
23
site controller. will turn on whenever the radio is transmitting.
SCNON - indicates the scan mode is enabled.
SON - indicates the selected group or chan-
nel is in the scan list.
1ON - (conventional mode only) indicates
the selected channel is designated as the
priority-one scan channel.
2ON - (conventional mode only) indicates
the selected channel is designated as the
priority-two scan channel.
XMIT
Speaker
Icon
UNIVERSAL DEVICE CONNECTOR (UDC)
The Universal Device Connector (UDC) provides
connections for external accessories such as a headset
or a speaker-microphone. When the radio is locked in a
vehicular charger/repeater the UDC provides the audio
and control connections between the radio and the vehicular charger/repeater. The UDC is also used to program and service the radio.
24
ON - (conventional mode only) indicates
that the selected channel has T99 decode
option enabled.
ALERT T ONES
The M-RK II radio also provides audible alert tones
or "beeps" to indicate the various operating conditions.
These alert tones can be enabled or disabled through
programming.
Call Originate
A short mid-pitched alert tone sounds after keying the
radio (Push-T o- T alk b utton is pressed). This indicates the
radio has been assigned a working channel or that the
radio is transmitting on a conventional channel and v oice
communication may begin immediately. In conventional
mode, this tone may be delayed after the PTT button is
pressed due to GE-STAR s ignalling (if enabled through
programming).
Autokey (Trunked Mode Only)
After being placed in queue or releasing the PTT
button prior to a working channel assignment, the site
calls the radio when a channel becomes available. At this
point, the radio automatically keys the transmitter
(autokey) for a short period to hold the channel. The radio
sounds a mid-pitched tone when it is clear to talk; immediately press the PTT button to keep the assigned channel.
Call Queued (Trunked Mode Only)
A high-pitched tone after pressing the PTT button
indicates the system has placed the call request in the
queue. The receiving unit(s) also hear the tones, indicat-
25
ing they will receive a call shortly . If the the PTT button is
released, the radio will autokey whenever a channel
becomes available (see Autokey).
System Busy (Trunked Mode Only)
Three low-pitched beeps will be heard if the radio is
keyed when the system is busy, if no channels are
available for sending the message, if the call queue is
full, or if an individual call is being attempted to a radio
that is transmitting. Releasing the PTT button and rek eying initiates a new channel request.
Call Denied (Trunked Mode Only)
If the radio is keyed and a low pitched tone is heard
then the radio is not authorized on the system that has
been selected.
Carrier Control Timer
If the programmed time for continuous transmission
is exceeded, five short high-pitched warning tones followed by a long low-pitched tone will be heard. The
transmitter will shut down shortly after hearing the alert,
interrupting communications. Release and re-key the
PTT button to maintain communications. This will reset
the carrier control timer and turn the transmitter back on.
Low Battery W arning
A low-pitched tone is heard and comes on
indicating that the battery voltage is low. The radio will
continue to receive and transmit.
26
BAT
Low Battery Alert (Transmit Lockout)
If the radio is keyed and a low-pitched tone or two
tones repeated until PTT or CLEAR button is pressed
(either conditions is pre-programmeable) is heard and
LOW BATT is displayed, the battery is discharged and
the radio will not transmit. The radio will still be able to
receive calls until the battery is discharged beyond the
point of operation, after which the battery will need to be
recharged to resume normal operation.
Key Press Alert
A short tone or "beep" sounds to indicate a key has
been pressed. A short low-pitched tone indicates no
action was taken because the key is not active in the
current mode.
OPERATION
TURNING ON THE RADIO
Rotate the POWER ON-OFF/VOLUME knob clockwise, out of detent to turn the radio on. (Ensure the
antenna and battery pack are properly connected prior
to power on.) A short beep (if enabled through programming) indicates the radio is ready for operation. The
display indicates, if programmed, the last selected system name on line one and the last selected group or
channel name on line two.
In the EDACS trunk ed en vironment, upon acquisition
of the control channel, will come on. If communi-
cation with the system’s control channel cannot be es-
SVC
27
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