Ericsson EDACS M-RK-II Scan Portable Radio
Enhanced Digital Access Communcations System

Trunking Environment and Conventional Communcation Systems
October 1994, Ericsson GE Mobile Communications Systems, Inc.

Ericsson, Inc.
Mountain View Road
Lynchburg, VA 24502
1-800-528-7711

Operator’s Manual

Table Of Contents

Introduction

User Interface

Buttions And Knobs
Keypad
Display

Messages
Status Indicators

Universal Device Connector (UDC)
Alert Tones

Call Originate
Autokey (Trunked Mode Only)
Call Queued (Trunked Mode Only)
System Busy (Trunked Mode Only)
Call Denied (Trunked Mode Only)
Carrier Control Timer
Low Battery Warning
Low Battery Alert (Transmit Lockout)
Key Press Alert

Operation

Turning On The Radio
Selection Mode Rules
Button And Keypad Reassignment
System/Group/Channel Selection

System Selection
Group And Channel Selection

Trunked Mode Operation

Receiving A Call
Sending A Cal
Emergency Operation

Receiving An Emergency Call
Declaring An Emergency Call

Wide Area System Scanning
ProSound
Scanning Trunked Groups

Adding and Deleting Groups on Scan List
Turning Scan On
Turning Scan Off

Individual Calls

Receiving And Responding To An Individual Call (Trunked Mode Only)
Sending An Individual Call (Trunked Mode Only)

Telephone Interconnect Calls

Receiving A Telephone Interconnect Call (Trunked Mode Only)
Sending A Telephone Interconnect Call (Trunked Mode Only)
DTMF Overdial /Conventional Mode
Telephone Interconnect

Portable Data

Displays
Data Off Operation
Data On Operation
Exiting Data Calls
Scan Lockout Mode
Data Lockout Mode

Status Operation

EDACS Conventional P1 Scan

Dynamic Regroup Operation

Emergency Operation
Conventional Mode Operation

Receiving A Call
Sending A Call
Emergency Operation

Using 5-Tone Signalling for Emergency Declaration

Tone Encode Transmission
Scanning Conventional Channels
Adding and Deleting Channels on Scan List

Turning Scan On
Turning Scan Off

Aegis And Voice Guard Operation

Voice Modes

Clear Modes
Aegis Digital Mode
DTMF
Error Messages
Aegis Private And Voice Guard Private Modes

Transferring Keys Into The Radio
Displaying The Currently Used Cryptographic Key Number
Key Zero

Private Operation

Receiving An Encrypted Call
Transmitting An Encrypted Call
Scanned Group Calls

Macro Key Operation

Operating Rules And Regulations Operating Tips

Batterypacks

Charging The Battery Pack
Recharge4ble Battery Pack Disposal
Installing The Battery Pack
Removing The Battery Pack

Intrinsically Safe Usage
Batterypacks
Accessories
Glossary
Operator’s Radio Setup
Warranty
Nickel-Cadmium Battery Warranty

Introduction

This manual describes how to use the EDACS M-RK Scan Portable Radio. The M-RK II Scan 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 communication 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 Is manual may be enabled or disabled through programming. Consult the system administrator for the particular features that are programmed into the M-RK II Scan.

User Interface

The M-RK II Scan operating controls are located on the radio’s front, top and left panels. A 6-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 button, 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 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.

Figure 1 -- M-RK II Scan Portable Radio





Figure 2 -- Top and Partial Left Panel Views

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

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 ad justs 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 in creases 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 (ie. VOL = 31). The volume range is from a minimum pro grammed level of zero (displayed as OFF in the display) up to 31 which is the loudest level.

Provides single button emergency channel access. See the EDACS and conventional emergency sections for more details.

Programmable per system.

Serves several purposes depending on the operating mode. In trunked mode, the CLEAR/MONITOR button exits the current operation and removes afi displays associated with it. The radio and display then return to the group receive state. In conventional 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 and scan disabled.

Enables the radio’s transmitter. Releasing PTT returns the radio to the receive mode.

The keypad layout has a total of 6 keys. The keys have special functions and are labeled as such using a symbol or abbreviated word describing its plimary function. Numeric entry is a secondary function of the keys. Each key is described below.


Figure 3 -- M-RK II Scan Keypad

,

Primary function -- changes the system or group/channel (depending on programming); secondary function -- changes to a selection for items within a list. Press to scroll in increasing order, to scroll in decreasing order. To auto-ramp press and hold the key.

Primary 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 menu list is accessed, select a menu item from the list via or and activate it with this key. Once activated, continues its secondary function for activating a selected parameter setting until the radio retums to its normal receive state. This is similar to an enter key.

Programmable per system

Adds or deletes selected groups or channels from the scan list of the currently selected system. See trunked and conventional scan section for details.

Toggles scan operation on and off. When the radio is scanning, SCN is on and all groups or channels in the scanfist of the currentlyselected system are scanned.

The radio’s display is shown below. The 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.


Figure 4 - M-RKII Scan 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 Refer to the MENU section to change the display (invert or contrast).

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, (ie. volume or contrast adjust). These messages are described below

MESSAGE -- Name -- Description

QUEUED -- Call Queued -- Trunked mode only. Indicates the system has placed the call in a request queue.

SYS BUSY -- System Busy -- 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.

DENIED -- Call Denied -- Trunked mode only. Indicates the radio is not authorized to operate on the selected system.

CC SCAN -- 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.

WA SCAN -- 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).

TALKARND -- Talk-around-- Conventional mode only. Indicates the radio is operating on conventional channels in talkaround mode (no repeater).

*RXEMR* -- Receive Emergency -- Trunked mode only. Indicates an emergency call is being received. This message will be flashing on line two.

*TXDMR* -- Transmit Emergency -- Trunked mode only. Indicates an emergency call has been transmitted. This message will be fiashing on line two.

VOL=31 -- Volume Level -- Indicates the current volume level. The volume level display ranges from OFF (silent) to 31 (loudest).

LOW BATT -- Battery Low -- Indicates the battety 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 -- Trunked mode only. Indicates an individual calf is being received by an unknown radio ID. This bypasses when the call is updated.

TX DATA -- Transmit Data -- Trunked mode only. Indicates when a data call is being transmitted. Displayed on line one.

RX DATA -- Receive Data -- Trunked mode only Indicates when a data call is being received. Displayed on line one.

DATA OFF -- Data Off -- Trunked mode only. Indicates when radio is in data disable state. Displayed on line one.

DATA ON -- Data On -- Trunked mode only. Indicates when radio is toggled to data enable state. Displayed on line one for two seconds.

KEY ZERO -- Key Zero -- Indicates that cryptographic keys have been erased from radio memory.

PVT DIS -- Private Disabled -- Indicates that the group or channel is not programmed for private mode operation.

FRCD PVT -- Forced Private -- Indicates that group or channel is pre-programmed for private mode operation and clear mode is not possible.

NO KEY # -- No Key Number -- Indicates that the correct cryptographic key is not loaded for the selected group or channel.

The 15 status indicators show the various operating characteristics of the radio. The indicators show operating modes and conditions as follows:

SVC -- Trunked 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 lailsoft mode (if enabled through programming).
OFF - indicates the radio is out of range or the control channel is not available.

CG -- Conventional mode only.
ON - indicates Channel Guard encode/decode is enabled on the selected conventional channel.

BAT -- ON - indicates the batterypack’s charge is low and needs recharging.

PVT -- Private

ON - indicates the group or channel is enabled to receive encrypted messages.
FLASHING - indicates an encrypted transmission is being received.

BSY -- Channel 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.

WHC -- Who 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.

SPC -- ON -- indicates the radio is in the special call selectlentry mode (Individual or Telephone Interconnect).

HI -- High power

ON - indicates the selected group or channel is selected to transmit at high power.
OFF - indicates the selected group or channel is selected to transmit at low power.

XMIT -- ON - 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 site controller. XMIT will turn on whenever the radio is transmitting.

SCN -- ON -- indicates the scan mode is enabled.

S -- ON -- indicates the selected group or channel is in the scan list.

1 -- ON -- (conventional mode only) indicates the selected channel is designated as the priority-one scan channel.

2 -- ON -- (conventional mode only) indicates the selected channel is designated as the priority-two scan channel.

-- ON -- (conventional mode only) indicates that the selected channel has T99 decode option enabled.

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.

The M-RK II Scan radio also provides audible alert tones or “beeps” to indicate the various operating conditions. These alert tones can be enabled or disabled through programming.

A short mid-pitched alert tone sounds after keying the radio (Push-To- Talk button is pressed). This indicates the radio has been assigned a working channel or that the radio is transmitting on a conventional channel and voice communication may begin immediately. In conventional mode, this tone may be delayed after the PTT button is pressed due to GE-STAR signalling (if enabled through programming).

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.

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, indicating they will receive a call shortly. If the the PTT button is released, the radio will autokey whenever a channel becomes available (see Autokey).

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 re-keying initiates a new channel request.

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.

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.

A low-pitched tone is heard and BAT comes on indicating that the battery voltage is low. The radio will continue to receive and transmit.

If the radio is keyed and a low-pitched tone or two tones repeated until PTT or CLEAR button is pressed (either condition is pre-programmable) 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.

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 trunked environment, upon acquisition of the control channel, will come on. If communication with the system’s control channel cannot be esyablished, SVC will not tum on. This may occur if, for example, the radio is out of range of the trunking site. It may be necessary to move to another location or select another trunking system to reestablish the control channel link for trunked mode operations.

Many operations require selection from a list such as system, group or phone number. This selection process is handled in the same manner for all lists. , , , , and the CLEAR/MONITOR button are used during the selection process. The following example systems list is used to explain the process:

SYSTEM
1 2 3 4		NORTH SOUTH EAST WEST

After entering a selection mode, the following generic display format will appear



Line one shows the currently selected item name (XXXXXXXX) from the list. Line two indicates the list (YYY) that the selection is to be made from and the number of the selected item (ZZZ) within the list. (In some cases the information on lines 1 and 2 will be the opposite of this example.) If SYSTEM 2 is the current selection, the display appears as follows:



Line one contains the current system name, SOUTH, and line two, SYS = 2, indicates that selection is from the system list and it is the second system within the list.

A new system from the list is selected by using and to scroll through the list in increasing and decreasing order respectively. In the previous example, pressing selects the EAST system as shown in the next display.



The radio may be programmed to wrap around from one end of a list to the other end or to stop at the ends.

Note

While in system, group or channel selection mode, the radio continues to receive calls normally and continues scanning if it is enabled. If a call is received during the selection mode process the radio will return to the normal receive mode display. Continuing with the selection process will return the display to the same point in the selection process if the selection mode time out has not yet expired. Any press of the PTT button during the selection mode process will initiate transmission and exit the selection mode.

To exit the selection mode, press the CLEAR/MONITOR button or wait for the timeout

The menu function accesses features that are not available directly from the keypad. The order and specific number of menu items available is configurable through programming. Upon radio power up, the menu item that is at the beginning of the menu list will always be displayed first. Subsequent access to the menu function will return the last menu item that was shown in the display. To enter the menu mode, press . , , and the CLEAR/MONITOR button are used during the selection process. All of the selection mode rules previously detailed apply to the menu item selection process with the exception of direct access. The radio will continue to receive and transmit normally while in the menu function.

A new item is displayed by using and to scroll through the list in increasing and decreasing order respectively. The displayed menu item is made active by pressing .

After entering the menu selection mode, the following generic display format will appear.



Line one indicates the radio is in the menu selection mode. Line two indicates the menu item (YYYYYYYY) that is to be viewed or changed (some menu items provide radio information and do not have changeable parameters).

An example of the menu item selection process and menu item parameter change is detailed below for the backlight menu item.

PRESS: The menu mode is entered.

PRESS: or until the display shows:



PRESS: The backlight menu item is activated and the display will be similar to the following:



Line one shows the active menu item and its current parameter setting (XXX). Line two shows the currently selected system or group name (YYYYYYYY).

The menu item’s parameter setting shown in the display can now be changed by using or to scroll through the list of parameter values. Once the desired setting is reached press to store the value and return the normal display. For menu items that display radio information pressing or will scroll through a list of informational displays. The menu items are listed Table 1.

Note

The TX POWER menu item, when selected, toggles HI/LO power. It does not use or to scroll nor an additional press of the MNU button.

Table 1 - Menu Item Information

Feature	Display
Keypad Lock	KEYLOCK
Backlight Adjust	BCKLIGHT
Contrast Adjust	CONTRAST
Transmit Power Select	TX POWER
Radio Revision	REVISION
Invert (View) Display	INVERT
Toggle Scan On/Off	SCAN
Toggle Private Mode OrilOff	PRIVATE
Display Current AEGIS Encryption Key	DISP KEY
Display Current Home Group/Channel	HOME
Select Desired System	SYS SEL
Add Group/Channel to Scan List	SCANADD
Delete Group/Channel From Scan List	SCAN DEL
Add/Delete Scan List	SCANA/D
Select Telephone Numbers From Phone List	PHN CALL
Toggle Data Operation On/Off	NO DATA Trunked Only
Toggle Conv P1 Scan On/Off	ECP1SCAN TrunkedOnly
Select Individual Call from IC List	IND CALL Trunked Only
Select Status Message	STATUS 0 -- STATUS 9 Trunked Only
Select Group	GRP SEL Trunked Only
Toggle Talkaround Feature On/Off	TALKARND Conventional Only
Select Channel	CHN SEL Conventional Only

Pre-programming the radio using the PC Programming Software permits the reassignment of button and keypad key functions. The EMERGENCY, OPTION, CLEAR/MONITOR and PTT buttons along with the front panel keypad keys can be reassigned different functions. For Example, the key could be assigned as the HOME key, the key could be assigned as the VIEW key, etc.

The operating procedures that follow assume that the buttons and keypad keys operate as marked. If they have been reassigned, Table 2 should be completed to show the new function(s). Substitute the new assigned keys when using the operating procedures.

Table 2 - Button and Key Assignments

Standard Assignments	Reassignment
OPTION (Side)
CLEAR/MONITOR
PTT
EMERGENCY

In the following description of SYSTEM/GROUP/CHANNEL SELECTION, the term group is used for both group and channel.

The M-RK II Scan SYSTEM/GROUP/CHANNEL knob and the , pair are programmable for maximum flexibility. If the SYSTEM/GROUP/CHANNEL knob is assigned to select groups, then the , keys are assigned to select systems. If the SYSTEM/GROUP/CHANNEL knob is assigned to select systems, then the , keys are assigned to select groups. System, group and channel selection is the primary function for these controls.

Either systems or groups can also be selected by entering the select mode and following the selection mode rules described earlier. Only the selection assigned as the primary function of the , pair will be available for this method of direct selection. For example, if system selection is the primary function of the , pair then only the system select mode will be usable and direct group select will be unavailable. The system select or group select modes are entered by pressing from the standard receive mode. Using , after entering a particular selection mode in this manner is the secondary function of this key.

Several methods, some of which depend on programming, can be used to select a new system. These procedures are presumed to be starting from the normal receive display.

Method 1: If system selection is programmed to the SYSTEM/GROUP/CHANNEL knob, select a system by turning the SYSTEM/GROUP/CHANNEL knob to the desired system number position (1 16). The display registers the new system name on line one. If the knob is moved to a position greater than the number of programmed systems, the highest programmed system will remain selected.

Method 2: If system selection is programmed as the primary function of and select a system by pressing or to scroll through the system list The display registers the new system name on line one.

Method 3: Press to enter the system select mode and follow the selection mode rules detailed earlier. If system selection is programmed to the SYTEMIGROUP/CHANNEL knob, direct access to systems will not be available. Presses of or will scroll through different sets of 16 systems each (banks) if more than 16 systems are programmed into the radio. The systems within each bank are then selectable via the SYSTEM/GROUP/CHANNEL knob as described previously in METHOD 1.

Several methods, some of which depend on programming, can be used to select a new group or channel. These procedures are presumed to be starting from the normal receive display.

Method 1: If group selection is programmed to the SYSTEM/GROUP/CHANNEL knob, select a group by turning the SYSTEM/GROUP/CHANNEL knob to the desired group number position (1 - 16). The display registers the new group name on line two. If the knob is moved to a position greater than the number of programmed groups, the highest programmed group will remain selected.

Method 2: If group selection is programmed as the primary function of and select a group bypressing or toscroll through the group list. The display registers the new group name on line two.

Method 3: Press to enter the group select mode and follow the selection mode rules detailed earlier. If group selection is programmed to the SYSTEM/GROUP/CHANNEL knob, direct access to groups will not be available. Presses of or will scroll through different sets of 16 groups each (banks) if more than 16 groups are programmed into the radio. The groups within each bank are then selectable via the SYSTEM/GROUP/CHANNEL knob as described previously in METHOD 1.

Digital trunking provides fast communication access at all times, even during busy hours. In this mode the operator selects a communications system and group and the audio communication or working channel (WC) is allocated through digital signalling with the site.

1. Turn on the radio by rotating the POWER ONOFF/VOLUME knob clockwise (out of detent). A short alert signal (if enabled through programming) indicates the radio is ready to use.

2. The display shows the last selected or the power up (depending on programming) system and group names and indicates if the radio has acquired the system control channel by turning on SVC. If the radio is unable to obtain a control channel, line two shows CC SCAN and SVC will remain off.

3. Adjust the POWER ON-OFF/VOLUME knob to the desired volume level.

4. Select the desired system and group. The display indicates the current system and group names.

5. The radio is now ready to receive calls.

6. GROUP CALL -- When the radio receives a group call, it unmutes on the assigned working channel and BSY comes on. Line one shows GR followed by the logical ID number (if received) of the unit sending the message, or the associated name if the ID number is found in the individual call list.

7. INDIVIDUAL CALL -- When the radio receives an individual call (a call directed only to the user’s radio), it unmutes on the assigned working channel and turns on BSY and WHC. Line one shows ID followed by the logical ID number of the unit sending the message, or the associated name if the ID number is found in the individual call list

   Responding to the call prior to the programmed call-back time-out will automatically direct the call to the originating unit. If the caller’s ID is not received, UNKNOWN will display and there will be no callback hangtime.

1. Turn on the radio and set the POWER ON-OFF/VOLUME knob to the desired volume level. Select the desired system and group.

2. Press and hold the PTT button. The radio will display XMIT, the system and group names and perform the necessary signalling required to obtain a communication channel.

3. When the working channel is assigned, XMIT and BSY are turned on and a short beep sounds indicating that communication ran begin.

   Note

   If two or more tones, or a high pitched tone is heard, the system may be busy and the call request has been placed in queue or the request has been denied for some reason. Refer to the ALERT TONES section for more details.

4. Hold the radio approximately three inches from the mouth and speak in a normal voice into the microphone (located between and and on the keypad)

5. Release the PTT button when the transmission is complete and listen for a reply.

The radio’s ability to declare an emergency, clear an emergency, remain locked on an emergency system and group, and the emergency audio and display freeze can each be enabled or disabled through programming. When an emergency is declared scanning will stop and restarts only after the emergency has been cleared.

When receiving an emergency call from the selected group and system, an alert beep is heard and BSY comes on. The message *RXEMER* flashes in the display on line two until the emergency condition is cleared. Follow standard emergency procedures.

To send an emergency call to the selected system and group (or on an optionally preprogrammed group), proceed as follows:
1. Press and hold the red EMERGENCY button that is on top of the radio in front of the antenna for approximately one second (this time is programmable and therefore could be longer or shorter, check with the system administrator). The radio will transmit an emergency call request with the radio ID until an emergency channel assignment is received.

2. When the working channel assignment is received, the radio sounds a single beep (Autokey alert tone) indicating it is ready for voice transmission. *TXEMER* flashes on line two in the display until the emergency is cleared.

3. Press PTT and speak into the microphone in a normal voice. BSY turns on.

4. Release PTT when the transmission is complete and listen for a reply.

5. The emergency can be cleared by pressing and holding the CLEAR/MONITOR button followed by pressing the EMERGENCY button then releasing both buttons.

The M-RK II Scan radio may be programmed for wide area system scan operation for multi-site applications. Upon the loss of the currently selected system’s control channel, radios may be programmed to automatically scan the control channels of other systems. If a new control channel is found, the radio will switch to the new system and sound an alert tone.

The radio may also be programmed for priority system scan. A priority system may be assigned among the systems programmed into the radio. Radios programmed in this manner will check for the priority trunked system’s control channel at a programmable rate ranging from 1 to 16 minutes. This priority scan timer is reset each time the PTT button is pressed or when a call is received. If the priority system control channel is found, the radio will automatically switch to the priority system.

The radio may be programmed for ProSound system scan operation for multi-site applications. ProSound scanning is an enhanced replacement for wide area system scanning. This algorithm insures that the radio continually receives high quality audio. When the selected system degrades to a preprogrammed level, the radio changes to the new system and sounds a tone. Should the control channel be lost completely, the radio will scan the adjacent systems until a suitable one is found.

Groups which have been previously added to the scan list on a per system basis may be scanned. Each system’s group scan list is retained in memory when the radio is turned off or when the battery pack is removed.

The following procedures outline scan operations for trunked groups. See the conventional mode operating procedures for specific procedures on conventional channel scanning.

1. Scan must be off to add or delete groups from scan list. If the SCN status flag is on, press key to turn scan off.

2. Select the desired group using the SYSTEM/GROUP/CHANNEL knob and/or , keys. If the selected group is currently on the list, the S status flag will be on.

3. Press the key repetitively until the desired priority indicator appears: S for non-priority, 2 for priority two, 1 for priority one, or no indicator to remove the group from the scan list If a new priority group is selected, the previous corresponding priority group will become a lower priority scan group. One of the following messages may be momentarily displayed:

   SCAN DIS -- The radio is not programmed to scan.

   FIXED P1 -- A priority one group has been pre-programmed into the radio. A new priority one group cannot be selected.

   FIXD LST -- A fixed scan list has been pre-programmed into the radio. It is not possible to change the list without reprogramming the radio.

4. To add or delete additional groups, repeat steps 2 and 3.

   A group can also be deleted from the scan list, not the currently selected group, by pressing during scan operation while the radio is displaying the unwanted group. The group will be deleted from the system’s group scan list in the same manner as if done using the steps above. Deletions done in this manner will not remain deleted if the radio is turned off and then back on.

1. Toggle scan operation on by pressing . SCN will turn on when the radio is scanning.

2. When a group on the scan list receives a channel assignment, the radio unmutes on the assigned channel and BSY comes on. Line one shows GR followed by the logical ID number (if received) of the unit sending the message, or the associated name if the ID number is found in the individual call list. The group name displays on line two.
   • If the radio detects a call from the currently selected group, it has priority and the radio will switch to the selected group call.
     
   • The radio will continue scanning if a new group is selected when scan is on.
     
   • Pressing the PTT button when scan is on will cause the radio to transmit on the displayed group or to the currently selected group (depending on programming).

Toggle scan operation off by pressing . The radio will resume operation on the selected group.

Receiving And Responding To An Individual Call (Trunked Mode Only)

When the radio receives an individual call (a call directed only to the user’s radio), it unmutes on the assigned working channel and tums on BSY and WHC. Line one shows ID followed by the logical ID number of the unit sending the message, or the associated name if the ID number is found in the individual call list. The radio can be programmed to ring when an individual call is received. If enabled, the ring begins five seconds after the caller unkeys and will continue until the PTT button, the CLEAR/MONITOR button or the individual call mode is entered when the button is pressed.

If a response is made to the call prior to the programmed call-back time-out, the call will automatically be directed to the originating unit. If a response is not made before the call-back timeout, the radio will return to normal receive display, but WHC will remain on. If the caller’s ID is not received, UNKNOWN will display for the duration of the call and there will be no call-back hangtime.

To respond after the call-back time-out, press key then or while WHC is on and the display will show the caller’s ID. The individual call selection mode is now active and the selection mode rules apply. The caller can be responded to by pressing the PTT button if no other selection is made. Because the latest caller’s ID is stored in location 0 and the radio is now in the individual selection mode, the caller can be selected directly by pressing . If the caller is selected in this mannerproceed with the call bypressing the PTT button.

The following procedures describe how to initiate and complete an individual call.
1. To select a previously stored individual, enter the individual call mode using the key feature followed by or to scroll through the list of stored individuals. SPC turns on. The selection mode rules apply.

2. Press the PTT button; the radio performs the necessary signalling to obtain a communication channel. When the signalling is complete and the radio is clear to transmit, XMIT turns on, SPC turns off and the channel access tone sounds. Line one shows the called individual’s name if found in the list of stored individuals or ID followed by the logical ID number of the unit being called. The message *INDV* displays on line two. Proceed with the message.

Receiving A Telephone Interconnect Call (Trunked Mode Only)

Receiving a telephone interconnect call is identical to receiving an individual call. See the DTMF Overdial Operation section if access to services requiring “overdial” is needed. Overdial operations are available for any special call whether it is an individual call or a telephone interconnect call.

Use the following procedures to initiate and complete a Telephone Interconnect call:
1. To select a previously stored phone number, press followed by or to scroll through the list of stored phone numbers. SPC turns on. The selection mode rules apply.

2. Press and release the PTT button; the radio performs the necessary signalling to obtain a communication channel. When the signalling is complete and the radio is clear to transmit, XMIT turns on, SPC turns off and the channel access tone sounds. Line one shows the accompanying name selected from the list of stored numbers. The message *PHONE* displays on line two. The radio then automatically transmits the programmed number stored in the special call queue.

3. The telephone ringing will be heard. When someone answers the phone, press the PTT button and speak into the microphone. Release the PTT button to listen to the callee. Unsuccessful interconnect signalling returns the radio to the normal receive mode and the number remains displayed until the special call is cleared or the time-out expires or another group or system is selected. Terminate a call by pressing the CLEAR/MONITOR button.

   Note

   The M-RK II Scan radio is capable of simplex (one way) conversation only. The callee can only hear the radio if the PTT button is pressed (the radio is transmitting) and the callee can only be heard when PTT is released (the radio is receiving)

4. To terminate the call, momentarily press the CLEAR/MONITOR button.