Ericsson AEGIS M-PA User manual

Operator’s Manual
AEGISM-PA
PORTABLE RADIO
LBI-38798B
E

TABLE OF CONTENTS
INTRODUCTION . . . . . . . . . . . . . . . 3
CONTROLS . . . . . . . . . . . . . . . . . 3
INDICATORS . . . . . . . . . . . . . . . . 11
UNIVERSAL DEVICE CONNECTOR . . . 12
ALERTTONES . . . . . . . . . . . . . . . 12
OPERATION . . . . . . . . . . . . . . . . 13
POWER-UP . . . . . . . . . . . . . . 13
MODE/CHANNEL/CG SELECTION (Scan
and System Models) . . . . . . . . . . 14
VOICE MODES . . . . . . . . . . . . 15
Clear Modes . . . . . . . . . . . . 15
Aegis Digital Mode . . . . . . . . 16
Aegis Private And Voice Guard Private
Modes (Optional) . . . . . . . . . 16
RECEIVING A MESSAGE . . . . . . . 19
TRANSMITTING A MESSAGE . . . . 20
EMERGENCY OPERATION . . . . . . 21
SCANNING CHANNELS . . . . . . . 21
TELEPHONE INTERCONNECT
CALLS . . . . . . . . . . . . . . . . . 23
Copyright © May 1992, Ericsson GE Mobile Communications Inc.
TABLE OF CONTENTS (CONT.)
"KEY LOCK" MENU . . . . . . . . . . 26
"ALERT" MENU . . . . . . . . . . . . 27
OPERATINGTIPS . . . . . . . . . . . . . 27
OPERATING RULES AND REGULATIONS 28
BATTERY PACKS . . . . . . . . . . . . . 29
INSTALLING THE BATTERY PACK . . 29
REMOVING THE BATTERY PACK . . . 29
CHARGINGTHEBATTERYPACKS . . 29
RECHARGEABLE BATTERY PACK
DISPOSAL . . . . . . . . . . . . . . . 30
SWIVEL MOUNT REMOVAL AND
REPLACEMENT . . . . . . . . . . . . . . 31
INTRINSICALLYSAFE USAGE . . . . . . 31
BATTERY PACKS . . . . . . . . . . . 31
ACCESSORIES . . . . . . . . . . . . 32
PRODUCT SPECIFICATION FOR CE
MARKED EQUIPMENT . . . . . . . . . . 33
GLOSSARY . . . . . . . . . . . . . . . . 33
2

INTRODUCTION
The Aegis

M-PA

Select, Scan and System
portableradiosarehigh-performancetwo-wayradios
that provide clear voice, Aegis digital, and Aegis
privatecommunications. TheSelect,Scanand Sys-
tem radios are also compatible with Voice Guard®
communication systems. Personality programming
allows maximum integration flexibility into a public
service radio system.
Theradiomustbeequippedwiththeencrypt/de-
cryptoptionbeforeoperationinAegisprivateorVoice
Guardmodesispossible. Thisoptionallowstheradio
to communicate using highly secure state-of-the-art
Aegis and Voice Guard encryption and decryption
techniques.
Operating controls include a rotatable control
knob, rotatable volume control, push-to-talk, emer-
gency and monitor buttons. In addition, the Scan
model includes an eight-button keypad while the
System model includes a 16-button keypad. The
on/off power switch for the unit is located on the
removable battery pack.
The 8-digit alphanumeric liquid crystal display
(LCD)onthefrontoftheradiodisplaystheoperating
status of theradio. This backlit display also provides
twelvestatusflags(ScanandSystem)oreightstatus
flags (Select) that indicate various operating condi-
tionssuchasprivatecommunicationsenabled,trans-
mitter on, scanning, or emergency mode enabled.
The exact operation of your radio will vary de-
pending upon the mode of operation, the radio’s
programming, andthe particular radiosystem. Con-
sult your radio system’s representative for particular
features that are programmed into your radio.
CONTROLS
ON/OFF SWITCH
The ON/OFF SWITCH is located on the battery
pack. Sliding this switch up will supply power to the
radio from the battery pack. An audible click will be
heardandthe "ON" indicatorwill beexposed. When
the radio is turned on, it willperform a power-up self
test and then resume operation on the previous
operating channel as displayed in the LCD. Sliding
the switch down will turn the radio off.
3

VOLUME CONTROL KNOB
The VOLUME CONTROL KNOB is a rotatable
control on the top of the radio used to adjust the
receiver’s audio level in the speaker. Rotating this
knob in a clockwise direction will increase the audio
level. Counter-clockwise rotation will decrease the
audiolevel. Minimumlevelsmaybeprogrammedinto
the radio to prevent missed calls due to too low of a
volume setting.
CONTROL KNOB
Select Model
The rotatable 16-position CONTROL KNOB lo-
cated on the top of the radio selects the operating
channel. A stop plate may be installed under the
knobtolimitthemaximumnumberofpositionstoless
than sixteen (16). It is normally factory installed for
fifteen (15) positions.
Scan and System Models
The rotatable 16-position CONTROL KNOB lo-
catedonthetopoftheradioisprogrammedtoselect
the operating channel, mode, or specific Channel
Guard encode/decode tones. See MODE/CHAN-
NEL/CG SELECTION for details. A stop plate may
be installed under the knob to limit the maximum
number of positions to less than sixteen (16). It is
normally factory installed for fifteen (15) positions.
Some radios may be programmed with this knob
disabled.
PTT BUTTON
Pressing the PTT BUTTON on the side of the
radio will enable the radio’s transmitter. The "TX"
status flag in the display will turn on when the radio
is transmitting. Releasing the PTT BUTTON will re-
turn operation to receive mode.
MONITOR BUTTON
The MONITOR BUTTON is used to unsquelch
the receiver. Momentarily pressing this button will
disable squelch and the receiver noise will be heard
in the speaker.
4

Figure 1 - Aegis M-PA Select Model Radio
SIDE VIEW FRONT VIEW
5

Figure 2 - Aegis M-PA Scan Model Radio
SIDE VIEW FRONT VIEW
6

Figure 3 - Aegis M-PA System Model Radio
SIDE VIEW FRONT VIEW
7

Ifprogrammedenabledfortheselectedchannel,
ChannelGuard(CG)and/orType99(T99)signalling
will be enabled when the channel is selected. If CG
and/or T99 are enabled, the appropriate status flag
"CG" and/or "T99" willturn on. The MONITORBUT-
TON may then be used to toggle CG and/or T99
betweendisabledandenabledbypressingandhold-
ing it for at least one (1) second; the appropriate
status flag will toggleon oroff. TheMONITORBUT-
TON is also used to reset T99 operation after a call
is received.
EMERGENCY BUTTON
The EMERGENCY BUTTON is the small red
button located on top of the radio near the antenna.
If this button is programmed for emergency opera-
tion,pressingit for atleastone(1)second willcause
theradiototransmitGE-STARemergencysignalling.
The "EMG" status flag will turn on. GE-STAR is
transmittedaccording to one ofseveral differentpro-
grammable methods. See EMERGENCY OPERA-
TION for details.
Thisbuttonmayalsobeprogrammedasanhome
modebutton. Ifprogrammedinthismanner,pressing
it will switch operation to the programmed home
mode.
MENU BUTTON (Scan and System Models)
Pressing the MENU button causes the radio to
scroll through up to seven (7) different menus pro-
grammed into the radio. After the desired menu is
displayed, the feature within the menu is selected
with the SEL button. The menus that may be pro-
grammed are:
Menu Display Function Or Use
"CHANNEL" TheMENUandSELbuttonsare
programmed for channel selec-
tion. Whenthisdisplayappears,
select the desired channel with
the SEL button and then press
EXIT.
"MODE" TheMENUandSELbuttonsare
programmedformodeselection.
When this display appears, se-
lect the desired mode by press-
ing the SEL button and then
press EXIT.
"PHONE" Allowsselectionofone(1)ofthe
ten(10)programmedoruseren-
tered telephone numbers for
automatic dialling.
8

"KEY LOCK" Allows the keypad buttons to be
locked or unlocked.
"SCAN A/D" Allows channels to be added to
or deleted from the scan list for
the current mode. The priority-
onechannelandthepriority-two
channel are also set within this
menu.
"ALERT" Allows the alert tones to be dis-
abled or enabled.
"PHN EDIT" (SystemModel)Allowseditingof
the telephone phone numbers
programmed into the radio.
PRIVATE BUTTON
Theoptionalprivatetransmitmodeis enabledor
disabled by pressing and releasing the PVT button
(whenthemenumodeisnotselected). Whenprivate
transmitmodeisenabled,the"PVT"statusflaginthe
display will turn on. The radio is programmed for
switched orforcedprivateoperation. Intheswitched
configuration, the PVT button is operational. In the
forced configuration, the button is not operational.
If the radio is programmed for forced private
operation and the selected channel is programmed
for private operation, "FRCD PVT" will be displayed
when PVT is pressed;private transmit mode cannot
be disabled. If the radio is programmed for forced
private operation and the selected channel is not
programmed for private operation, "PVT DIS" will
momentarily show in the display when PVT is
pressed;the radio will notchange to private mode. If
the encrypt/decrypt option is not installed, the PVT
button has no function.
Figure 4 - M-PA Scan Model Keypad
9

EXIT BUTTON
Pressing the EXIT button will cause the radio to
exit the currentmenu displayandreturn operationto
the channel currently selected. If the menu mode is
notenabledwhenthebuttonispressed,pressingthis
button will turn the display and keypad backlighting
on for thirty (30) seconds if the backlight is pro-
grammed on.
SCAN BUTTON
Pressing the SCAN button on the keypad will
toggle scan operation on and off. When the radio is
scanning, the "SCN" status flag in the display will
show and all channels on the scan list will be
scanned.SeeSCANNINGCHANNELSforadditional
details.
SELECT BUTTON
Selecting different features within each menu is
accomplished with the SEL button. First, the menu
mode must be enabled and the desired menu must
be chosen by pressing and releasing the MENU
button until the desired menu appears in the display.
After the menu is chosen, the desired function or
feature is selected by pressing the SEL button. For
example, to disable or enable the alert tones, press
MENU until "ALERT" is displayed then press SEL to
select "ENABLED" or "DISABLED", as desired.
Next, press the EXIT button.
DTMF KEYPAD (System Model)
Telephoneinterconnectcalls can bemadeusing
the 12-button DTMF keypad.This keypad is enabled
when a channel programmed for DTMF operation is
selected. See TELEPHONE INTERCONNECT
CALLS for details
Figure 5 - Keypad
10

INDICATORS
The LCD on the Select model has eight al-
phanumberic characters and eight status flags.
The LCD on the Scan and System models has
eight alphanumeric characters and twelve status
flags. This display indicates the current operating
channel andvariousothermessages.Menuinforma-
tionisalsodisplayedontheScanandSystemModels
when enabled.
The System model also displays telephone in-
terconnect numbers.
LCD backlighting will turn on for a short period
anytimeanactivebuttonispressedortheCONTROL
KNOB is rotated. Backlighting may be programmed
to remain off at all times.
On the Scan and System models pressing the
EXITbuttonwhenthemenumodeisnotenabledwill
turndisplayandkeypadbacklightingonforthirty(30)
seconds (if backlight programming is on).
The status flags located along the top and bot-
tom of the display indicate operating status as fol-
lows:
EMG EMerGency mode - On indicates emer-
gencyGE-STARsignallinghasbeeniniti-
ated by the user.
HI HIgh power transmit - On indicates the
selected channel has been programmed
for high power transmit operation. Off
indicates low power transmit.
T99 Type99tonedecode- OnindicatesType
99 tone decoding is enabled on the se-
lected channel. Flashing indicates a T99
selective call has been received and the
radio must be reset to receive another
T99 call.
PVT PriVaTe mode - On indicates private
mode is enabled and the radio will trans-
mit encrypted messages on the selected
channel. Flashingindicatesanencrypted
message is being received.
Figure 6 -Liquid Crystal Display
11

TX Transmitter enabled - On when the radio
is transmitting.
BSY BuSY - On indicates a carrier is being
received (the channel isbusy). Note that
iftheselectedchannelisprogrammedfor
Channel Guard (CG), Digital Channel
Guard (DCG), or Type 99 (T99) tone de-
code operation, the radio may not un-
squelch if a valid tone(s) is not received;
the BSY status flag will be on.
CG ChannelGuard-OnindicatestoneChan-
nel Guard (CG) or Digital Channel Guard
(DCG) encode/decode is enabled on the
selected channel.
BAT BATtery low - On indicates the battery
pack’s charge is low.
S Scanlist-Onindicatestheselectedchan-
nel is on the scan list.
1priority1-Onindicatestheselectedchan-
nel is designated asthe priority-onescan
channel.
2priority2-Onindicatestheselectedchan-
nel is designated as the priority-two scan
channel.
SCN SCaN mode - On indicates the radio is
scanning.
UNIVERSAL DEVICE CONNECTOR
The Universal Device Connector (UDC) is lo-
catedonthesideoftheradiojustabovethePTTand
MONITORBUTTONS. Thisconnectorprovidescon-
nectionsfortheexternalaccessoriessuchasahead-
set,aspeaker-mike,oranemergencylanyard. When
theradioislockedinavehicularcharger/repeaterthe
UDC provides the audio and control connections
between the radio and the vehicular charger/re-
peater. The UDC is also used by the maintenance
personnel when the radio is programmed.
ALERT TONES
TheM-PAusesalerttonesor"beeps"toindicate
variousoperatingconditions. Thealerttonesmaybe
disabledwhentheradioisprogrammed.ontheScan
andSystemmodels, Thealerttonesmaybeenabled
ordisabledviathemenumodeifthe"ALERT"feature
is programmed. See "ALERT" MENU for details.
The remaining status flags are pro-
videdontheScanandSystemmodels
only.
NOTE
12

CARRIER CONTROL TIMER
This feature, programmable on a per channel
basis, prevents unnecessary channel traffic and ra-
dio damage in the event of a "stuck" mic. If the
programmed timer times-out during a transmission
the radio will sound an alert tone and disable the
transmission. Thebeepingtonewillcontinueuntilthe
PTT BUTTON is released. Releasing the PTT BUT-
TON resets the timer.
CHANNEL BUSY
If the radio is receiving a signal when the PTT
BUTTON is pressed, an alert tone will warn the
operator that the radio is receiving a carrier and the
transmission will not occur. "RX BUSY" is displayed
and the alarm is sounded as long as the PTT BUT-
TON ispressed. This feature isprogrammable onor
off on a per channel basis.
RECEIVE ONLY CHANNEL
Iftheselectedchannelisprogrammedasreceive
only the radio will sound an alert tone if a transmis-
sion is attempted. "RX ONLY" is displayed.
RADIO/CHANNEL FAILURE
If the synthesizer is unable to lock correctly on
theselectedchannel,oranotherradiofailureoccurs,
an alert tone will sound. If incorrect programming is
detected or the synthesizer fails to lock, the display
flashes "NO LOCK" then the selected channel’s
name.
PRIVATE MODE DISABLED (Scan and System
Models)
Iftheselectedchannelisprogrammedforprivate
operation and private transmit mode has been dis-
abled using the PVT button, the radio will sound a
low-pitched beep when the PTT button is pressed.
This warns the operator thatthe radio is transmitting
clear (non-encrypted) audio.
OPERATION
POWER-UP
After the battery pack and antenna have been
installed, turn the radio on by sliding the ON/OFF
SWITCH on the battery pack up. After the radio has
completedapower-upself-test,itwillbeginoperation
13

on the last operating state as displayed in the LCD.
Ifprogrammedon,thepower-upalerttone(beep)will
be heard.
MODE/CHANNEL/CG SELECTION (Scan and
System Models)
AegisM-PAradiosmaybeprogrammedwithup
to 160 different radio channels. A maximum of 10
modes of 16 channels each or 16 modes of 10
channelseachmaybeprogrammedintotheradio(10
x 16 = 160). Select the desired mode (bank of
channels) and channel, or channel and Channel
Guard(CG),accordingtotheradio’sprogrammingas
follows:
MENU And SEL Selects Mode
CONTROL KNOB Selects Channel (And CG)
1. Press the MENU button until "MODE" ap-
pears in the display.
2. Press the SEL button to select the desired
mode. The selected mode’s name will ap-
pear in the display.
3. PresstheEXITbuttontoswitchradioopera-
tiontotheselectedmodeandexitthemenu.
4. Select the desired channel by rotating the
CONTROL KNOB until the desired chan-
nel’s name appears in the display.
CONTROL KNOB Selects Mode
MENU And SEL Selects Channel (And CG)
1. Select the correct mode by rotating the
CONTROL KNOB until the desired mode’s
name appears in the display.
2. Press the MENU button until "CHANNEL"
appears in the display.
3. PresstheSELbuttonuntilthedesiredchan-
nel’s name appears in the display.
4. PresstheEXITbuttontoswitchradioopera-
tion to the displayed channel and exit the
menu.
MENU and SEL Selects Modes And Channels
CONTROL KNOB Selects Channel Guard
1. Press the MENU button until "MODE" ap-
pears in the display.
14

2. Press the SEL button until the desired
mode’s name appears in the display.
3. Press the MENU button until "CHANNEL"
appears in the display.
4. PresstheSELbuttonuntilthedesiredchan-
nel’s name appears in the display.
5. PresstheEXITbuttontoswitchradioopera-
tion to the new mode and channel, and exit
the menu.
6. SelectthedesiredChannelGuardusingthe
CONTROLKNOB. The"CG"statusflagwill
turn on if the selected position has CG
programmed. Position fifteen (15)is a non-
CGposition;itmaynotbeprogrammedwith
aChannelGuard. Positionsixteen(16)isa
default channel CGposition;selecting itwill
switch CG to the CG programmed for the
selected channel.
VOICE MODES
Each mode (bank of channels) in the radio is
programmedforeitherAegisorVoiceGuardcommu-
nications. Modes programmed for Aegis operation
have three (3) different voice modes that are pro-
grammableonaper-channelbasis: clear,digitaland
private. Modes programmed for Voice Guard opera-
tionhavetwo(2)voicemodesthatareprogrammable
onaper-channelbasis: clearandprivate. Theradio
must be equipped with the encrypt/decrypt option
before it will operate in Aegis private or Voice Guard
modes.
Clear Modes
Aegis clear and Voice Guard clear modes are
identical voice modes in which the radio transmits
andreceivesonlyclear(analog)voicesignals. These
analog signals arenon-digitizedand non-encrypted.
Clear mode transmissions can be easily monitored
byunauthorizedpersons. Channelsprogrammedfor
clearoperationcannottransmitorreceiveAegisdigi-
tal or private messages.
15

Aegis Digital Mode
Aegis digital mode allows the radio to transmit
and receive digitized voice signals. Aegis digital
signals provide improved weak signal performance
andtheycannotbeeasily monitoredwitha standard
receiver. Aegis digital signals are not encrypted.
Channels programmed for Aegis digital operation
transmit only digital signals and they can receive
clear and digital signals. In other words, with a
certain channel selected, the operator cannot
change from the digital transmit mode but the radio
will receive clear or digital signals. Private (en-
crypted) messages cannot be received when the
radio is in Aegis digital mode.
Aegis Private And Voice Guard Private Modes
(Optional)
The Aegis private and Voice Guard private
modes allow the radio to transmit and receive en-
cryptedmessages. Tooperateinthesevoicemodes,
TRANSMIT/RECEIVE MODE COMPATIBILITY
FOR AEGIS OPERATIONS
CHANNEL PRO-
GRAMMING (TRANS-
MIT)
RECEIVE CAPABILITY
CLEAR DIGITAL PRIVATE
CLEAR Yes No No
DIGITAL Yes Yes No
PRIVATE Yes No Yes *
* assumes the proper cryptographic key is loaded
TRANSMIT/RECEIVE MODE COMPATIBILITY
FOR VOICE GUARD OPERATIONS
CHANNEL PRO-
GRAMMING (TRANS-
MIT)
RECEIVE CAPABILITY
CLEAR PRIVATE
CLEAR Yes No
PRIVATE Yes Yes *
* assumes the proper cryptographic key is loaded
16

the radio must be equipped with the optional en-
crypt/decryptfeatureandthetransmittingandreceiv-
ing units must have identical cryptographic keys.
Aegis transmissions cannot be received when
theselectedchannelisprogrammedforVoiceGuard
operation. Accordingly, a Voice Guard transmission
cannot be received when the selected channel is
programmed for Aegis operation.
Cryptographic keys are transferred into the ra-
diousingacryptographicKeyloader. Uptoseven(7)
different cryptographic keys, numbered 1- 7, can be
transferred froma Keyloader andstored in the radio.
An individual key is automatically selected on a per-
channelbasisaccordingtotheradio’sprogramming.
Channels within Aegis modes can be programmed
for keys 1 - 6. Channels within Voice Guard modes
can be programmed for keys 1 - 7.
DES radios require a DES Keyloader (option
V4025). OperatingdetailsontheDESKeyloaderare
contained in LBI-31541. VGE radios require a VGE
Keyloader (option V4028). See LBI-31685 for oper-
ating details on the VGE Keyloader.
When operating on a channel programmed for
private mode, all transmissions will be private trans-
missions and the radio will receive clear and private
signals. The"PVT"statusflaginthedisplayturnson
whentheprivatemodeisenabled. InAegisScanand
System models, the mode may be toggled between
privateandclearusingthePVTbuttonIftheselected
channel is programmed for switched capability. Ra-
dios programmed for forced private operation do not
allowa changeofthetransmitmode;the PVTbutton
does not function.
Transferring Keys Into The Radio
Thefollowingprocedureoutlinesbasickeytrans-
ferring steps.
1. Turn the radio off.
2. Plug the modular connector of the Key-
loader cable into the Keyloader’s modular
jack.
Before private messages can be sent or
received, one or more cryptographic keys
must be transferred into the radio from the
Keyloader.
NOTE
17

3. ConnecttheKeyloadercabletotheUDCon
the radio.
4. PressthePWRbuttonontheKeyloaderand
wait for the Keyloader to display "MASTER
MODE".
5. Press the TRN button on the Keyloader. If
necessary, select a different cryptographic
key to be transferred into the radio.
6. Turn the radio on. The display should read
"KEY LOAD".
7. Press the EXE button on the Keyloader to
transfer the key. The Keyloader will display
"GOOD 1.x TRANSFER" where "x" is the
selected cryptographic key number.
8. Disconnect the cable from the radio’s UDC.
A single beep will be heard from the radio’s
speaker if the power-up alert tone is en-
abled. Theradiowillchangetotheselected
channel as indicated in the display.
Key Zero (Select Models)
The cryptographic keys stored in DES version
radios can be zeroed or "dumped" by removing the
battery pack for several minutes (typically three) or
disassembling theradio. Eitheractionwill clearallof
the keys stored in a DES radio.
The cryptographic keys stored in VGE version
radios cannot be zeroed once they are transferred
into the unit. A different key must beloaded into the
same location(s) to prevent unauthorized communi-
cations.
Key Zero (Scan and System Models)
All cryptographic keys stored in theradio can be
zeroedor "dumped" when theradio ison by simulta-
neously pressing the MENU and SCAN buttons for
at least one second. When the key(s) have been
zeroed, the radio will display "KEY ZERO" and itwill
emit a series of beeps. If cryptographic key(s) are
zeroed, one or more keys must be transferred into
the radio from the Keyloader before private commu-
nications may continue.
18

The cryptographic keys stored in DES version
radios can also be zeroed using two (2) additional
methods. Removing the battery pack for several
minutes (typically three), or disassembling the radio
willzeroallofthecryptographickeysstoredinaDES
version radio.
RECEIVING A MESSAGE
1. Slide the ON/OFF SWITCH on the battery
packtotheonposition. Theradiowillinitiate
and complete the power-up self-test and
beep if the power-up alert tone is pro-
grammed on.
2. Select model - Select the desired channel.
Scan and System models - Select the de-
sired operating mode, channel, and/or
Channel Guard. See the MODE/CHAN-
NEL/CG SELECTION for details.
3. Press the MONITOR BUTTON briefly to
disable squelch and adjust the VOLUME
CONTROL for the approximate desired
speaker audio level. Pressing the MONI-
TOR BUTTON may affect Channel Guard
and/or Type 99 tone operation if pro-
grammed for the selected channel.
4. If the selected channel is programmed for
private operation, the radio will automat-
ically switch between clear or private re-
ceive operation.
When an encrypted transmission is re-
ceived, the "PVT" status flag will flash, the
receiver will unsquelch, and the message
will be heard in the speaker. The selected
channel must be programmed for private
operationandthecorrectcryptographickey
must be loaded into the radio for this to
occur.
If a clear mode (non-encrypted) transmis-
sionisreceived,the receiver willunsquelch
anditwillbeheardinthespeaker. However,
if the selected channel is programmed for
Channel Guard or Type 99 tone operation,
the receiver will not unsquelch unless the
correct CG or T99 tone is received.
5. Adjust the volume as necessary.
19

TRANSMITTING A MESSAGE
1. Select models - Select desired channel.
Scan and System models - Select the de-
sired mode, channel, and/or Channel
Guard.
If the channel has been programmed for
digital operation, the radio will transmit
Aegis digital signals and itwill receive clear
and Aegis digital signals.
Encrypt/decryptoptionallyequippedradios:
If a channel programmed for private opera-
tion is selected and there is no key in the
radio for the selected channel "NO KEY x"
(where "x" is the key number) will peri-
odicallyflashinthedisplay. Ifatransmission
is attempted, "NO KEY x" will show in the
display and the radio will emit a series of
beeps and will not transmit Scan and Sys-
tem models .
When private mode is enabled, the "PVT"
statusflaginthedisplaywillturnon. Toggle
transmit operation to private or clear, as
desired, by pressing the PVT button (when
themenumodeisnotenabled).Ifachannel
is not programmed for private mode opera-
tion,"PVTDIS"willmomentarilyshowinthe
display if an attempt is made to enable
private transmit mode. It is not possible to
operate on this channel in private mode. If
the radio is programmed for forced private
operation, "FRCD PVT" will momentarily
show in the display if an attempt ismade to
disable private transmit mode.It is not pos-
sible to transmit on this channel in clear
mode.
2. Ensure no one is transmitting on the se-
lected channel by pressing the MONITOR
BUTTON to disable squelch or observing
the display for the absence of the "BSY"
status flag. If the Channel Busy Lockout
feature is programmed for the selected
channel,theradiowillnottransmitwhenthe
channel is busy.
3. PressandholdthePTTBUTTON. The"TX"
and "BSY" status flags are displayed.
NOTE: In Scan and System modes, if the
selectedchannelisprogrammedforprivate
operationandcleartransmitmodehasbeen
selected, an alert tone (low-pitched beep)
will be heard in the speaker when the PTT
BUTTONispressedasawarningthatradio
is not in private mode.
20