Datron World Communications G25RMV110 VHF Mobile Radio User Manual G25AMK004a
Datron World Communications Inc VHF Mobile Radio G25AMK004a
Contents
- 1. Operator Manual
- 2. Technical Manual
- 3. Revised Page 3 of Manual
Operator Manual

Trunk-Mount Mobile Radio 
Operator Manual 
APCO Project 25 Compliant 
Datron World Communications Inc.  Phone:  1-760-597-1500 
3030 Enterprise Court  E-mail:  guardian@dtwc.com 
Vista, CA  92083  Part Number:  G25AMK004 Rev. A 
USA  www.dtwc.com  

 2000 Datron World Communications Inc.  All Rights Reserved. 
GuardianTM operator manual for use with the trunk-mount mobile radio.  
This manual, as well as the software described in it, are furnished under license and may only be 
used in accordance with the terms of such license.  This manual is furnished for informational 
use only, is subject to change without notice, and should not be construed as a commitment by 
Datron World Communications Inc.  Datron assumes no responsibility or liability for any 
errors or inaccuracies that may appear in this manual.  
Except as permitted by such license, no part of this publication may be reproduced, stored in a 
retrieval system, or transmitted, in any form or by any means—electronic, mechanical, recording, 
or otherwise—without the prior written permission of Datron World Communications Inc.  
GuardianTM is a trademark of Datron World Communications Inc.  
Written and designed at Datron World Communications Inc., 3030 Enterprise Court, Vista, 
California 92083 USA. 
For defense agencies: Restricted Rights Legend.   Use, reproduction, or disclosure is subject to 
restrictions set forth in subparagraph (c)(1)(ii) of the Rights in Technical Data and Computer 
Software clause at 252.227-7013. 
For civilian agencies: Restricted Rights Legend.  Use, reproduction, or disclosure is subject to 
restrictions set forth in subparagraphs (a) through (d) of the commercial Computer Software 
Restricted Rights clause at 52.227-19 and the limitations set forth in Datron’s standard 
commercial agreement for this software.   Unpublished rights reserved under the copyright laws 
of the United States.  
Printed in the USA. 
Manual model number:  G25AMK001.  Specifications are subject to change without notice.   
This device made under license of one or more of the following US Patents: 5,164,986; 5,146,497; 
5,185,795; 4,636,791; 4,590,473; 5,185,796; 5,148,482; 5,271,017; 5377229; 4,833,701; 4,972,460. 
The IMBETM voice coding technology embodied in this product is protected by intellectual 
property rights including patent rights, copyrights, and trade secrets of Digital Voice Systems, 
Inc. The voice coding technology can only be used as part of the North American land mobile 
radio communications system for the APCO Project 25.   The user of this technology is 
explicitly prohibited from attempting to decompile, reverse engineer, or disassemble the Object 
Code, or in any other way convert the Object Code into human-readable form. 
Made in the 
USA 

NOTICE TO USER  
WARNING!  Maintain a distance of at least 60 cm between the antenna 
and people. 
To satisfy RF exposure compliance, you, as a qualified user of this radio device 
must control the exposure conditions of bystanders to ensure the minimum 
distance is maintained between the antenna and nearby persons.  The operation 
of this transmitter must satisfy the requirements of the Occupational/Controlled 
Exposure Environment for work-related use.  Transmit only when people are at 
least the minimum distance from the properly installed, externally mounted 
antenna. 
This radio is designed for initial setup by authorized technicians using a 
computer and the GuardianTM programming software. Programming can enable 
or disable many of the radio’s features from user access per user agency 
security policy and legal restrictions. All, some, or none of the features and 
functions described in this manual may be available to the user. To successfully 
operate the radio, it is important to understand how the radio is programmed 
prior to issuance by the user agency. Consult authorized agency personnel for 
features and functions made available or restricted to the user. FCC licensees 
are prohibited by federal law from enabling the radio to directly enter transmit 
frequencies using the radio's controls. 
NOTICE TO INSTALLATION TECHNICIANS 
Use only a manufacturer- or dealer-supplied antenna. 
Antenna minimum safe distance:  60 cm. 
The Federal Communications Commission (FCC) has adopted a safety standard for 
human exposure to Radio Frequency (RF) energy that is below the Occupational 
Safety and Health Act (OSHA) limits.  
Antenna mounting: The antenna supplied by the manufacturer or radio dealer must be 
mounted at a location so that during radio transmission people cannot come closer 
than the minimum safe distance to the antenna, i.e., 60 cm. 
To comply with current FCC RF exposure limits, the antenna must be installed at or 
exceeding the minimum safe distance, and in accordance with the requirements of 
the antenna manufacturer or supplier.  
Base station installation: The antenna should be fixed-mounted on an outdoor 
permanent structure.  Address RF exposure compliance at the time of installation.  
Antenna substitution:  Do not substitute any antenna for the one supplied or 
recommended by the manufacturer or radio dealer.  You may be exposing people to 
harmful RF radiation.  Contact your radio dealer or manufacturer for further 
instructions.  

DATRON WORLD COMMUNICATIONS INC. 
Guardian VHF Portable                    i 
Contents 
INTRODUCTION........................................... 1 
ACCESSORIES .............................................. 1 
PALM MICROPHONE ...............................1 
DTMF MICROPHONE.............................1 
ANTENNAS.............................................1 
EXTERNAL SPEAKER ..............................1 
EXTENDED DC POWER CABLE ................1 
PROGRAMMING KIT ...............................1 
KEY VARIABLE LOADER .............ERROR! 
BOOKMARK NOT DEFINED. 
SERVICE MANUAL .................................2 
QUICK START............................................... 2 
FEATURES AND SPECIFICATIONS ........ 2 
CAPACITIES ...........................................3 
Channels ................................................... 3 
Zones of Channels..................................... 3 
Banks of Zones .......................................... 3 
Shadow Channels...................................... 3 
Encryption Keys ........................................ 3 
Encryption Algorithm ............................... 4 
Squelch Options ........................................ 4 
EMERGENCY CALL.................................4 
ALERT TONES ........................................4 
 FRONT PANEL DESCRIPTION ................ 5 
POWER-VOLUME KNOB .........................5 
CHANNEL SELECT KNOB ........................5 
PROGRAMMABLE SWITCH ......................5 
STATUS INDICATOR................................6 
SPEAKER SWITCH...................................6 
SPEAKER INDICATOR..............................6 
PROGRAMMABLE BUTTONS....................6 
MENU BUTTONS ....................................6 
PUSH-TO-TALK BUTTON ........................7 
DISPLAY ................................................7 
RADIO OPERATION .................................... 8 
SELECTING CHANNELS...........................8 
SELECTING SHADOW CHANNELS ............8 
SELECTING HOME CHANNEL ..................8 
SELECTING A ZONE ................................9 
SELECTING A BANK ...............................9 
SELECTING TALK-AROUND ....................9 
SCANNING .............................................9 
ADJUSTING SQUELCH.............................9 
TRANSMIT INHIBIT OVERRIDE ..............10 
EMERGENCY CALL ..............................10 
SELECTING ENCRYPTION......................10 
TRANSMITTING ....................................10 
ZEROIZING ENCRYPTION BUTTONS ......10 
RADIO SETTINGS.......................................11 
MENU STRUCTURE...............................11 
REQUIRED PASSWORDS........................11 
ENTERING DATA..................................12 
SCAN OPERATION MENU .....................12 
SELECT MENU .....................................12 
HOME CHANNEL MENU .......................13 
PROGRAM MENU .................................13 
Global Setting Submenu ..........................13 
Backlight (BKLITE) ...........................13 
Backlight Delay (BL DLY).................13 
Time-out Timer (TOT)........................13 
Display (DISPLY)...............................14 
Home Channel (HOM)........................14 
Emergency Channel (EMG)................14 
Emergency Call (ALERT) ..................14 
Transmit Inhibit (TX INH)..................14 
Repeater Delay (RPTR) ......................14 
Global Erase (ERASE)........................15 
Channel Setup Submenu..........................15 
Scan Setup Submenu................................15 
Password Setup Submenu........................16 
COVERT MENU ....................................16 
ENCRYPTION MENU.............................17 
RADIO CLONING........................................17 
ENCRYPTION KEYFILL ...........................17 
TROUBLESHOOTING................................18 
PRODUCT INFORMATION ......................19 
FACTORY SUPPORT ..............................19 
USER SERVICING .................................19 

GUARDIAN P25 INTEROPERABLE RADIO FAMILY 
Guardian VHF Mobile 
1
Introduction 
The Guardian trunk-mount mobile radio is carefully crafted with advanced 
electronics, software, and materials incorporated into a rugged, professional 
grade design, offering years of reliable service with reasonable care.  Numerous 
combinations of options, features, and channel settings are possible through 
software programming.  The Guardian is a VHF radio providing 136 to 174 
MHz in analog or digital, wideband or narrowband modes, and is APCO 
Project 25 compliant. Consult authorized personnel for information and user 
training, and before attempting to modify radio settings. 
Accessories 
Contact your Datron representative for details on these accessories. 
Palm Microphone (G25AMM001) 
The palm microphone is a standard microphone with coiled cord and black 
finish. 
DTMF Microphone (G25AMM002) 
The dual-tone multifrequency (DTMF) signaling microphone is required to 
make alphanumeric entries and selections during direct radio programming. 
Antennas 
There are four antennas available depending on the used frequency range.  Do 
not substitute inappropriate antennas, connect the radio to an external 
amplifier, or use the radio without any antenna.  Improper antennas or 
connections may pose RF hazard to personnel. 
External Speaker (G25AMS001) 
The external speaker provides 10W of clear communications audio from the 
radio.  Comes with data and speaker cable.  
Extended dc Power Cable (G25AMG002) 
The extended dc power cable is an extra-length, 25 ft. power cable intended for 
longer runs between vehicle battery and radio. 
Programming Kit (G25AXR010) 
The programming kit is required for full access to radio features.  Includes a 
manual, software, cloning cable, and carry case. 

DATRON WORLD COMMUNICATIONS INC. 
Guardian VHF Mobile  2
Service Manual (G25AMK005) 
The service manual is used to assist trained technicians in locating technical 
problems. 
Quick Start 
The Guardian radio requires initial setup by qualified personnel using the 
Guardian programming software.  
1.  Power availability.  Power is supplied by starting the vehicle engine.  
2.  Select speaker.  Set the speaker switch to I for internal speaker 
operation, E for external, or B for both speakers simultaneously.   
3.  Power on.  Turn the power-volume knob clockwise about half way 
around.  When a transmission is heard, set the volume to a comfortable 
level.  There is a 5-second delay on power up for the radio self-test. 
4.  Select channel.  Turn the channel knob until the desired channel 
displays.  
5.  Receive.  The first volume knob position mutes the speaker for silent 
operation.  Other positions control the speaker volume. 
6.  Transmit.  Install the palm microphone using the microphone jack on 
the front panel.  Press the PTT button and speak about 4 inches away from 
the microphone.  Release the PTT button when finished speaking.  
Features and Specifications 
The Guardian mobile 256-channel (4 banks, 16 zones) radio provides multi-
mode plain and secure communications in the 136-174 MHz spectrum.  
Premium standard features include data encryption standard (DES) single-bit 
cipher feedback (SBCF) analog encryption, high-output LCD, tri-color LED 
status indicator, 16-position rotary volume and channel knobs, programmable 
switch and function buttons, speaker switch, and indicator.  Channels can be 
individually programmed for 25 kHz wideband or 12.5 kHz narrowband 
operation, analog or digital, plain or encrypted, with transmitter power settable 
from 25W to 110W in three steps (25W, 50W, and 110W).  Up to seven 
shadow channels can be programmed for any channel providing all-mode 
radio performance.  Sixteen encryption keys can be stored in the radio.  

GUARDIAN P25 INTEROPERABLE RADIO FAMILY 
Guardian VHF Mobile 
3
Capacities 
Channels 
There are 256 channels (frequency pairs) available for programming.  Each can 
be set for receive and transmit frequencies, wideband or narrowband, analog or 
digital, various squelch types, encryption key, power output level, and an 8-
character alphanumeric channel tag (name).   
Zones of Channels 
Sixteen zones (groups of channels) are available for programming.  Each zone 
can have up to 16 channels (16 zones x 16 channels/zone=256 channels). 
Zones are assigned group tags (names) of up to 8 alphanumeric characters, and 
selected as programmed by the toggle switch, function buttons, or through the 
menu and keypad.  
Banks of Zones 
Four banks (groups of zones) are available for programming.  Each bank can 
have up to 16 zones assigned.  Banks are assigned group tags of up to 
8 alphanumeric characters, and selected using the menu and keypad. 
Shadow Channels 
Up to 7 shadow channels are available for each primary channel.  Shadow 
channels enable you to monitor and reply (if all settings match) to all 
transmissions on a given channel.  Shadow channels can have different 
modulation modes (analog or digital), bandwidths, squelch modes, digital 
network access codes (NAC), and encryption key than their associated primary 
channel.  Each shadow channel must have the same transmit and receive 
frequencies, scan list, talk-around, locked options, and transmit power level as 
its associated primary channel.  The primary or shadow channel can have 
analog encryption enabled.  Shadow channels count toward the 256-channel 
total radio capacity.  Shadow channels are created and edited through the 
programming software.  Consult authorized personnel for assigning a shadow 
channel.  
Encryption Keys 
Up to 16 encryption keys can be stored in the radio for selective assignment to 
each applicable channel.  Selection of a new key from the key list replaces the 
default key for a selected channel.  

DATRON WORLD COMMUNICATIONS INC. 
Guardian VHF Mobile  4
Encryption Algorithm 
Standard Guardian software includes an SBCF analog DES encryption, usable 
on 25 kHz wideband channels.  
Squelch Options 
Analog squelch options are none, continuous tone-coded squelch system 
(CTCSS), and digital-coded squelch (DCS).  Digital squelch options are none, 
network access code (NAC), and talk-group identifier (TGID) including 
individual call.  
Emergency Call  
This feature is used when the radio is connected to an external, user-supplied 
emergency switch, and when programmed for emergency operation.  In alert 
mode, emergency messages display and a beep is heard every time the radio 
transmits the emergency message.  In silent mode, emergency transmissions are 
made but the radio does not beep and emergency messages do not display. 
Alert Tones 
Audible tones provide important information about the radio’s operating state 
or condition: 
Tone pitch  Tone length   Description  
Low  Beep  Button press error/failed self-test/talk timeout 
warning/empty channel 
Low  Continuous  Talk time-out/talk inhibit/invalid mode/radio locked 
Medium  Beep  Button press/passed self-test/receiving in clear voice 
Medium  Pulse  Emergency call mode/key error 
High  Beep  Low input voltage (vehicle power) 
High  Pulse  Individual call  

GUARDIAN P25 INTEROPERABLE RADIO FAMILY 
Guardian VHF Mobile 
5
 Front Panel Description 
Figure 1:  Controls and Indicators 
Power and Volume Knob  
The last counterclockwise position is power off.  The first clockwise position is 
power on with the speaker muted.  Subsequent clockwise positions (clicks) 
increase the speaker volume.  The clicking feature prevents accidental knob 
rotation.  Rotate the power-volume knob clockwise about half way around.  
When a transmission is heard, set the volume to a comfortable level.  
Channel Select Knob 
The 16-position rotary knob is programmed for radio operating channels. 
Consult authorized personnel for channel assignments.  
Programmable Switch 
The 3-position (A, B, C) toggle switch can be programmed for zone select, 
transmit encryption enable/disable, scan on/priority/off, power high/low, talk-
around on/off, monitor on/off, or not used.  Consult authorized personnel 
for assigning specific functions. 
A
B
C
E
B
I
Power
and Volume
Channel Select
Display
Programmable
Switch
Speaker
Status
Indicato
r
Microphone
Jack
M
e
n
u
 B
u
tt
o
n
s
Programmable
Buttons
Speaker Indicator
Speaker Switch
Escape
Scroll
Enter

DATRON WORLD COMMUNICATIONS INC. 
Guardian VHF Mobile  6
Status Indicator 
The color LED status indicator signifies: 
Color  Action  Description  
Red Steady Transmitting 
Green  Steady  Receive mode/receiving clear transmission 
Green Flashing Receiving encrypted transmission 
Orange  Steady  Emergency call state/low-battery condition/squelch off  
Speaker Switch 
The 3-position toggle switch selects the internal radio speaker (I), external 
vehicle speaker (E), or both (B) speaker operations.  
Speaker Indicator 
When the external speaker is selected, the speaker indicator is red.  
Programmable Buttons 
These three buttons can be programmed for monitor on/off, LCD backlight 
bright/dim/off, transmit encryption enable/disable, scan list add/delete, scan 
on/priority/off, keypad disable, signal strength indicator on/off, talk-around 
on/off, home channel select, power high/low, next zone, or not used.  Consult 
authorized personnel for assigning specific functions to these buttons.  
Menu Buttons 
These four buttons perform actions determined by the display located above 
them.  The right-hand Enter (ENT) button lets you enter information into the 
radio and to toggle between a setting and its value.  The left-hand Escape (ESC) 
button allows you to return to a previous display without making changes to 
values.  Scroll buttons move a highlight up and down menu choices as 
indicated on the display.  
ESC ENT
When data is entered using the DTMF keypad, the scroll buttons move the 
highlight left to right.  Scroll direction is also indicated on the display. 
ESC ENT

GUARDIAN P25 INTEROPERABLE RADIO FAMILY 
Guardian VHF Mobile 
7
Push-to-Talk Button 
The PTT button located on the palm microphone provides standard push-to-
transmit and release-to-receive radio operation.  
Display  
On power up the radio briefly displays the Guardian name and software 
version numbers.  The display then indicates the operating status for the 
selected channel.  Turn the channel knob to select a different channel to view. 
Figure 2:  Channel Status 
The display consists of various icons. 
Group type icons:  B = bank, Z = zone.  Channel type icons:  C = channel, S = 
shadow channel, H = home channel, E = emergency, a  around a channel type 
means it is included in a scan list.  Modulation type icons:  AW = analog 
wideband, AN = analog narrowband, and DG = digital, a  around the 
modulation type means squelch is active.  Other icons:  TX = transmit mode,  
RX = receive mode, TA = talk-around, ∩∩∩ = repeater, and ³ = encrypted. 
To include a channel in the scan list, press the up scroll button once.  To 
remove it from the list, press the down scroll button once. 
Squelch is activated from the channel setup submenu; refer to the Radio 
Settings section. 
ZREGION  5
FIREC
AW HI
G
roup
Type
Repeater
Mode Modulation
Type (with
squelch on
)
Encryption
(On)
TX RF
Powe
r
Group
Tag
Channel
Tag
Channel
Type
Channel Included
In Scan List

DATRON WORLD COMMUNICATIONS INC. 
Guardian VHF Mobile  8
Press Enter to access the main menu.  
SCAN
SELECT
HOME
PROGRM
COVERT
ESC ENT
ENCRPT
Figure 3:  Main Menu 
Use the scroll buttons to highlight a menu selection.  Press Enter to access its 
submenu.  Press Escape to revert to the previous display. 
Submenus can consist of more than one display and are cyclic (roll over to the 
first display after the last display).  When a submenu continues on more than 
one display, a  displays in the lower right corner.  Press Enter to access the 
continued submenu. 
Radio Operation 
Selecting Channels 
Rotate the channel select knob while observing the display to choose the 
desired channel.  Consult authorized personnel for assigning channels.  
Selecting Shadow Channels 
A DTMF keypad is required to select a shadow channel.  When a transmission 
is received on a shadow channel, an S displays as the channel type.  The talk-
back timer allows you to transmit within 10 seconds on the shadow channel. 
The talk-back timer is reset at the end of each message received.  Shadow 
channels are held or selected by pressing the asterisk (*) followed by the shadow 
channel number (1 to 7) while the associated primary channel is selected.  
Revert to the primary channel by either pressing asterisk (*) and zero (0), two 
asterisks  
(* *), the Escape button, or by allowing the talk-back timer to reset itself.  
Selecting Home Channel 
If a button is programmed for a home channel, press the designated home 
button.  The channel status for the home channel displays.  Consult 
authorized personnel for assigning a home button. 

GUARDIAN P25 INTEROPERABLE RADIO FAMILY 
Guardian VHF Mobile 
9
To assign a different home channel, access the main menu.  For more 
information, refer to the Radio Settings section. 
Selecting a Zone 
If a button or switch is programmed for zone select, press the designated zone 
button or position the toggle switch appropriately.  Consult authorized 
personnel for assigning a zone button. 
A zone is selectable by accessing the main menu.  For more information, refer 
to the Radio Settings section. 
Selecting a Bank 
Banks are selected by accessing the main menu.  For more information, refer to 
the Radio Settings section. 
Selecting Talk-Around  
Talk-around forces the transmit frequency to an equal receive frequency for a 
selected channel, useful for direct radio-to-radio communication when a 
repeater is unavailable.  If a button or switch is programmed for talk-around, 
press the designated button or position the toggle switch appropriately.  
Consult authorized personnel for assigning a talk-around button. 
Talk-around is selectable by accessing the main menu.  For more information, 
refer to the Radio Settings section. 
Scanning 
If a button is programmed for scan select, press the designated scan button or 
select the designated toggle switch position to select or deselect scanning.  
Consult authorized personnel for assigning a scan button. 
The scanning process begins and is visible by pressing Escape to return to the 
channel status display.  The four letters on top of the display differ depending 
on the selected scan mode (scan, search, or zone). 
Scan is activated and setup from the main menu as well.  For more 
information, refer to the Radio Settings section. 
Adjusting Squelch 
Press and briefly hold the switch programmed for monitoring until the squelch 
adjust status displays.  Use the scroll buttons to change the squelch setting.  
Consult authorized personnel for assigning a monitor switch. 

DATRON WORLD COMMUNICATIONS INC. 
Guardian VHF Mobile  10 
Squelch is also adjustable from the main menu.  For more information, refer 
to the Radio Settings section. 
Transmit Inhibit Override 
If the radio is set for transmit inhibit override, press PTT twice quickly to 
transmit over an existing conversation on the channel.  For more information, 
refer to the Radio Settings section. 
Emergency Call 
To activate, use the external user-supplied emergency switch (radio must be 
programmed).  The radio initiates and continues in an emergency call state 
until the emergency call is deactivated.  
To deactivate, press and hold the external user-supplied emergency switch 
(radio must be programmed) until the radio beeps, or power off the radio with 
the power-volume knob. 
For information about setting the emergency switch to normal or silent, refer 
to the Radio Settings section. 
Selecting Encryption 
Selection of encrypted or plain mode is automatic since channels are 
programmed for plain or encrypted mode.  If you attempt to reprogram the 
radio from encrypted to plain, the radio generates an alert tone when PTT is 
pressed for an encrypted channel.  For more information, refer to the Radio 
Settings section. 
Transmitting 
Press the PTT button and speak at a normal level about 4 inches from the 
microphone.  Release the PTT button when finished speaking.  Do not hold 
the PTT longer than necessary after talking.  Channels programmed for receive-
only operation sound an alert tone, display RX ONLY, and do not transmit. 
Zeroizing Encryption Buttons 
Use the external user-supplied emergency switch to zeroize (radio must be 
programmed) the encryption buttons.  Selective zeroization is performed using 
the programming (PROGRM) menu, if enabled.  For additional zeroizing 
information, refer to the Radio Settings section. 

GUARDIAN P25 INTEROPERABLE RADIO FAMILY 
Guardian VHF Mobile 
11 
Radio Settings 
Setting the radio’s functions and features is selectively permitted or restricted 
according to agency policy and federal law, by authorized technicians using the 
programming software.  Internal radio software provides limited access to 
certain features and settings.  Menus shown in this manual may not be 
available on the radio.  Consult authorized personnel to determine the features 
and functions that are enabled for your radio.  
Menu Structure 
The Guardian operates with most of its features already programmed providing 
single-button action.  The ability to change certain programmed settings is 
made available by accessing menus.  For information on use of these menus, 
refer to the Radio Settings section. 
Channel
Status
Main
Menu
Scan
Status
Receive
Status
Squelch
Adjust
Status
SCAN SELECT
GLOBAL CHANEL SCAN PSSWRD
Scan Menu Select Menu Program
Menu
Covert Menu Encryption
Menu
Channel
Status
HOME PROGRM COVERT ENCRPT
Global Setup Channel
Setup Scan Setup Password
Setup
Figure 4:  Menu Structure Diagram 
Required Passwords 
Passwords may be required to enter the program, covert (COVERT), and 
encryption (ENCRPT) submenus.  Use the DTMF keypad to enter 
predetermined passwords.  An incorrect password causes INVALID ENTRY to 
display.  Press Escape and try again.  If an invalid password is attempted three 
times consecutively, ACCESS DENIED displays.  Press Escape to resume radio 
operation.  To enter a new valid password, power off and on the radio. When 
submenus are disabled, the radio displays MENU DISABLE.  Consult authorized 
personnel for guidance. 

DATRON WORLD COMMUNICATIONS INC. 
Guardian VHF Mobile  12 
Entering Data 
The DTMF keypad is required to enter alphanumeric data into the radio.  In 
addition, the type of character that displays depends on whether ALPHA or 
NUMBER is set in the display setting from the global (GLOBAL) submenu. 
For numeric characters, a keystroke on the DTMF keypad displays the number 
and moves the cursor to the right.  When finished, press Enter. 
For alpha characters, press the key bearing the desired letter on the DTMF 
keypad multiple times as required to show it on the display.  Use the scroll 
buttons to navigate across the line.  When finished, press Enter. 
Scan Operation Menu 
Access the main menu, scroll to highlight SCAN, and press Enter.  Choose to 
enable or disable the scan function, select the scan mode, and enable or disable 
priority channels.  For scan mode, select SCAN for normal scanning, SEARCH 
for a scan of all frequencies programmed into the radio, and ZONE for 
scanning all zones in the zone scan list.  Priority (PRITY) scanning includes 
none (OFF), one (PR1), or two (PR2) predefined priority channels.  Activity on 
priority channels overrides all other modes except emergency.  
Select Menu 
Access the main menu, scroll to highlight SELECT, and press Enter. Choose 
programmed channels, zones, banks, and enable or disable the talk-around 
mode.  ZONE permits an alternate zone selection, and BANK permits a bank 
selection different than the one used in the programmed bank scan.  Talk-
around (TKRD), when on, forces the transmit frequency to an equal receive 
frequency for a selected channel, useful for direct radio-to-radio 
communication when a repeater is unavailable. 
Setting  Value 
ZONE  Select alternate 
BANK   Select alternate 
PHON (Phone) (Future development) 
MSGE (Message received)  (Future development) 
IDCL (Individual call))  (Future development) 
TONE(Tone) (Future development) 
TKGP(Talk group) (Future development) 
TKRD (Talk-around) Off or on 

GUARDIAN P25 INTEROPERABLE RADIO FAMILY 
Guardian VHF Mobile 
13 
Home Channel Menu 
Access the main menu.  Scroll to highlight HOME and press Enter.  The home 
channel displays.  To assign a different home channel, select GLOBAL from the 
program menu. 
Program Menu 
Allows the operator to change global radio settings, channel settings, scan 
options, and the password.  Access the main menu and scroll to highlight 
PROGRAM.  Press Enter.  If required, enter the predefined password for this 
radio and press Enter.  
Note:  LISTS and SCLISTS are future developments, presently unavailable. 
Global Setting Submenu 
From the program menu, highlight GLOBAL, and press Enter.  Choose from 
the following settings: 
Setting  Value 
BKLITE (Backlight)   BRIGHT/DIM/OFF 
BL DLY (Backlight delay) 0 to 9 seconds  
TOT (Time-out timer)  30 to 300 seconds in 30 second intervals/OFF 
DISPLY (Display)  ALPHA/NUMBER 
HOM (Home channel)  Home channel designation 
EMG (Emergency)  Emergency channel designation 
ALERT  NORMAL/SILENT 
P/D EM   (Future development) 
TX INH (Transmit inhibit)  CARR/CARR+O/TONE+O/NAC/NAC+O/NONE 
RPTR (Repeater)  (Future development) 
ERASE  Erase or delete all settings  
Backlight (BKLITE)  
Enables, disables, and varies the intensity of the LCD and keypad illumination. 
Backlight Delay (BL DLY)  
Sets the time delay for the LCD and keypad backlighting.  
Time-Out Timer (TOT)  
Limits the duration of messages (30 to 300 seconds in 30-second increments), 
reducing the possibility of accidental PTT.  The off setting allows unlimited 
transmitting time. 

DATRON WORLD COMMUNICATIONS INC. 
Guardian VHF Mobile  14 
Display (DISPLY) 
Sets the display to either alpha or numeric characters when using the DTMF 
keypad. 
Home Channel (HOM) 
Sets the home channel within the active zone and bank.  Scroll to HOM and 
press Enter.  The channel’s receive and transmit frequency displays but cannot 
be changed.  Select the desired home channel using the channel knob.  Press 
Enter to confirm the new home channel. 
Emergency Channel (EMG) 
Sets the emergency channel within the active zone and bank.  Scroll to EMG 
and press Enter.  The channel’s transmit frequency displays but cannot be 
changed.  Select the desired emergency channel using the channel knob.  Press 
Enter to confirm the new emergency channel. 
Emergency Call (ALERT) 
Sets the emergency call alert mode.  Scroll to ALERT and press Enter.  Choose 
NORMAL or SILENT to change the emergency call alert state.  In normal mode, 
EMERG TX and EMG displays and the radio beeps every time the radio transmits 
the emergency message, until deactivated.  In silent mode, there is no beep or 
display. 
Transmit Inhibit (TX INH) 
Locks the PTT switch to prevent talking over other radio conversations.  Select 
from one of six behaviors:   
Setting  Description 
NAC  Inhibit transmission on a busy channel using a different NAC 
NAC+O  Override NAC inhibit with two rapid PTT actions 
CARR  Inhibit transmission on a busy channel 
CARR+O  Override CARR inhibit with two rapid PTT actions 
TONE  Inhibit transmission on a busy channel using a different squelch 
tone 
TONE+O  Override TONE inhibit with two rapid PTT actions 
NONE  No transmit inhibit 
Repeater Delay (RPTR) 
This feature is under development and is not currently available.  

GUARDIAN P25 INTEROPERABLE RADIO FAMILY 
Guardian VHF Mobile 
15 
Global Erase (ERASE) 
Erases all settings and resets the radio to factory defaults. 
Channel Setup Submenu 
Accessed from the program menu, this submenu allows you to change channel 
settings.  Channels can be selectively locked preventing you from making 
changes.  If a locked channel is selected, CHANNEL LOCKED/ACCESS DENIED 
displays. 
Select the desired channel using the channel knob.  Scroll to CHANEL and press 
Enter.  The channel number and tag (if defined) for that channel display.  
Scroll to highlight the desired choices.  To quickly cycle to the next channel for 
programming, press the down scroll button once after setting HI PWR. 
If digital mode is chosen, analog settings do not display.  If analog mode is 
chosen, digital settings do not display.  If the radio is not programmed for 
encryption, those settings do not display.  Some setting require use of a DTMF 
keypad. 
Setting  Value 
MODE (Modulation)   Analog/Digital 
B/W (Bandwidth) 12.5 kHz/25 kHz 
ENCRPT (Encryption) Enable/Disable 
K (Encryption key)  Choose from established list of keys 
RX (Receive frequency)  Enter receive frequency using keypad 
SQ (Squelch) Receive squelch sensitivity setting 
RXNAC (Receive NAC)  Choose digital receive network access code 
RXSQMD (Receive squelch) None/Noise/DCS/CTCSS 
TON (CTCSS tone)  Choose CTCSS squelch tone 
CODE (DCS code)  Choose DCS code 
TALKGP (Talk group) Enter 5-digit number of talk group 
TX (Transmit frequency)  Enter transmit frequency using keypad 
TXNAC (Transmit NAC)  Choose digital transmit network access code 
TXSQMD (Transmit squelch) None/DCS/CTCSS 
LO PWR (Low TX power) Choose low transmit power setting 
HI PWR (High TX power) Choose high transmit power setting 
Scan Setup Submenu 
Accessed from the program menu, this submenu sets basic functions of scan 
delay, revert mode, and priority-scan channels.  Highlight SCAN and press 

DATRON WORLD COMMUNICATIONS INC. 
Guardian VHF Mobile  16 
Enter.  The delay setting is the length of time in seconds the radio stays on the 
channel after the last transmission ends and before scanning resumes.  The 
radio switches to the revert channel when you switch out of scan mode.  Revert 
choices are the last channel selected (LSTSEL), the last channel received 
(LASTRX), or the home channel (HOME).  The radio switches to the priority 
channel (P1 or P2) when activity is detected on either of these channels.  
Setting  Value 
DELAY (Scan delay)   Set time in seconds to resume scanning 
RVERT (Revert channel) LSTSEL/LASTRX/Home 
P1 (Priority 1 channel)  Designate first priority channel 
P2 (Priority 2 channel)  Designate second priority channel 
Password Setup Submenu 
Accessed from the program menu, this submenu changes the current 
6-character password.  Highlight PASSWORD and press Enter.  Enter the old 
password using the DTMF keypad and press Enter.  If the entered password is 
incorrect, INVALID ENTRY displays.  Press Escape and try again.  Three 
consecutive invalid entries and OLD PASSWORD LOCKED displays.  Turn the 
radio off and on again if necessary.  When the old password is accepted, enter 
the new password.  Confirm the new password by entering it again.  If the new 
password is entered incorrectly, NEW PASSWORD REJECTED displays.   
Covert Menu 
Used to set the radio for covert operation including muting the speaker, 
alarms, beeps, and backlighting.  From the main menu highlight COVERT and 
press Enter.  Use the DTMF keypad to enter the predefined password for this 
radio and press Enter.  Covert settings override all other radio settings.  
Setting  Value 
DISPLY (Backlight)   Off/on, disable/enable backlighting 
SPEAKR (Speaker) Off/on, disable/enable speaker 
WHISPR (Whisper) Off/on, disable/enable speaker 
KBEEPS (Key beeps)  Off/on, disable/enable key beeps 
ALARMS (User alert tones)  Off/on, disable/enable user alert tones 
LED (Status indicator)  Off/on, disable/enable LED status indicator 
DEFAULT (Audible alarms)  Resets radio to non-covert (normal) settings 

GUARDIAN P25 INTEROPERABLE RADIO FAMILY 
Guardian VHF Mobile 
17 
Encryption Menu  
Used to set the radio for encrypted operation and accessed from the main 
menu. Highlight ENCRYPT and press Enter.  Use the DTMF keypad to enter 
the password for this radio.  Press Enter. 
Setting  Value 
KEYSEL (Key select)   Choose the active key for the channel 
ZEROIZE (Zeroize keys) Zeroize key for channel or all keys 
DF KEY (Default key)  Activates the channel’s default key 
Radio Cloning 
Cloning enables the transfer of channel settings between Guardian radios.  
Consult authorized personnel for guidance.  Perform the following steps to 
clone one Guardian radio with another: 
1.  Power off both radios.   
2.  Connect the source and target radios together using the Guardian cloning 
cable (PN G25AMKG004).  
3.  Power on the target radio and then the source radio.   
4.  The source radio automatically detects the connection and FULL CLONE 
displays.  
5.  Press PTT on the source radio to start the download.  If there are problems 
between the source and target radios, the source radio times-out after  
20 seconds, CLONING ERROR displays, and the radio reverts to PTT TO SEND 
for another attempt.  Check the connectors and repeat the steps. 
6.  When finished, the target radio resumes normal operation. 
7.  The source radio displays PTT TO SEND and remains in cloning mode in 
order to clone additional radios, if desired. 
8. Press 
Escape, or power off and on the radio, to resume normal radio 
operation. 
Encryption Keyfill 
Encryption keyfill is accomplished using a computer and the Guardian 
programming software (PN G25AXR001).  A key variable loader (KVL) is an 
optional accessory used for keyfill.  Perform the following steps to load keys 
into a Guardian radio using a KVL: 
1.  Power off the target radio. 
2.  Connect the KVL to the target radio.   
3.  Power on the radio.  

DATRON WORLD COMMUNICATIONS INC. 
Guardian VHF Mobile  18 
4.  The radio automatically detects the KVL and KVL KEYFILL displays.  If not, 
check the connections, and repeat the steps.  
5.  Use the scroll buttons to highlight the desired key slot.  To set the key slot 
selection, press Enter.  
6.  To verify the key identification, press ID for the key ID display.  Press TAG to 
return to the key display.  
7. Press 
Enter to access the key transfer display. 
8. Press 
PTT on the KVL to initiate the key transfer.  When the transfer is 
successful, SUCCESS KEY DATA UPDATED displays.  If unsuccessful, FAILURE 
KEY DATA NOT UPDATED displays.  Press Enter to return to the key tag or the 
key ID displays.  
9.  To stop the transfer, press Escape on the radio to return to the key tag or 
the key ID displays. 
10. Press 
Escape or power off and on the radio to resume normal operation. 
For more information regarding its operation, consult the KVL instruction 
manual. 
Troubleshooting 
The following table of symptoms, possible causes, and suggested corrective 
actions may be helpful.  Consult authorized personnel for further guidance.  
Symptom  Probable Cause  Corrective Action 
Radio does not power on  No power source  Furnish power source 
Cannot talk with other 
users in plain mode  Radios programmed for 
different frequencies, squelch 
tones, talk-group IDs 
Program radios to same 
frequency settings 
Background noise or other 
conversations heard  Other users on channel or 
improper squelch tone setting  Select another channel or 
program squelch tones to 
eliminate interference 
Error message on display  Operational error in radio  Follow display 
instructions 
Alarm message on display  Encryption alarm in radio  Press PTT to clear alarm. 
Ensure encryption key is 
loaded into selected slot 
Limited talk-out range  Radio signal obstructed or 
insufficient height above 
terrain  
Move away from large 
metal objects or to higher 
ground 

GUARDIAN P25 INTEROPERABLE RADIO FAMILY 
Guardian VHF Mobile 
19 
Product Information 
Factory Support 
This product is covered by the limited warranty on the back cover of this 
manual.  For warranty service, contact Technical Support Services Group, 
Datron World Communications, 3030 Enterprise Ct., Vista, CA 92083, or 
phone (760) 597-1500 or e-mail guardian.service@dtwc.com.  Before calling 
have the following information: (1) radio model number, serial number, and 
date of installation, (2) name of dealer or supplier of equipment, (3) detailed 
explanation of the suspected problem, (4) return shipping instructions, and (5) 
telephone or fax number where the buyer can be contacted.  Do NOT return a 
radio to the factory for service without first obtaining an RMA number from 
the Technical Support Services Group.   
User Servicing 
There are no user serviceable parts inside.  This product is subject to 
electrostatic discharge (ESD) damage.  Specialized maintenance and repair 
procedures are required.  Unsuccessful attempts to repair this product can void 
the warranty.  This product requires customer-specific programming to 
function as required.  Radio programming is performed using a computer and 
authorized software.  The factory does not have knowledge of customer-specific 
programming.  Government agency users should contact their authorized 
personnel for assistance regarding the correct operation of this product. 
.

 Limited Warranty and Remedies 
Datron warrants that its manufactured products (radios) are free from defect in 
design, materials, and workmanship for a period of 24 months from date of 
shipment from factory. Products such as antennas, batteries, carry cases, and 
other parts purchased from other vendors for resale are warranted for a period of 
12 months from date of shipment from factory. If products do not provide 
satisfactory service due to defects covered by this warranty, Datron will, at its 
option, replace or repair the item(s) free of charge. This warranty is limited to the 
original purchaser and is not transferable. Repair service performed by Datron is 
w
arranted for the balance of the original warranty or 90 days, whichever is longer. 
Exclusive Warranty: There are no other warranties beyond the warranty as 
contained herein. No agent, employee, or representative of Datron has any 
authority to bind Datron to any affirmation, representation, or warranty 
concerning the equipment or parts that is not in conformity with the warranties 
contained herein. EXCEPT AS EXPRESSLY SET FORTH ABOVE, NO OTHER 
W
ARRANTIES, EITHER EXPRESSED OR IMPLIED, ARE MADE WITH 
RESPECT TO THE EQUIPMENT OR THE PARTS CONTAINED THEREIN, 
INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF 
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND 
DATRON EXPRESSLY DISCLAIMS ALL WARRANTIES NOT STATED 
HEREIN.   
Limitations of Warranty: This warranty does not cover: (1) physical damage to 
the equipment or its parts that does not involve defects in design, material, or 
workmanship, including damage by impact, liquids, temperature, or gases, (2) 
damage to the equipment or its parts caused by lightning, static discharge, voltage 
transients, or application of incorrect supply voltages, (3) defects or failures 
caused by unauthorized attempts to repair or modify the equipment, and (4) 
defects or failures caused by abuse or misuse.  
Remedies: Buyer’s sole remedies and the entire liability of Datron are set forth 
above. In no event will Datron be liable to Buyer or any other person for 
damages, including any incidental or consequential damages, expenses, lost 
profits, lost savings, or other damages arising out of use of or inability to use the 
equipment.  
GuardianTM radios are manufactured by Datron World Communications 
Inc. Datron is respected worldwide as the best value supplier of voice and 
data communications products for government and business.