E.F. Johnson Company LTR 98xx, LTR 98 Series Operating Manual

LTR® 98xx SERIES

HIGH TIER

OPERATING MANUAL

Part No. 002-9803-201 November 1999

LAND MOBILE PRODUCT WARRANTY - The manufacturer’s
warranty statement for this product is available from your product
supplier or from the E.F. Johnson Company, 299 Johnson Avenue, Box
1249, Waseca, MN 56093-0514. Phone [phone].

Copyright© 1999 by the E.F. Johnson Company

The E.F. Johnson Company, which was founded in 1923, designs, manu­factures, and markets radio communication products, systems, and
services worldwide. E.F. Johnson produces equipment for land mobile
radio and mobiletelephone services which include business, industrial,
government, public safety, and personal users.

Viking Head/EFJohnson logo, LTR®, and Call Guard® are registered
trademarks of the E.F. Johnson Company. All other company and/or
product names us ed i n t his manu al are trademarks and/ or reg is ter ed tr ade ­marks of their respective manufacturer.

SAFETY INFORMATION

SAFETY INFORMATIO N

The FCC has adopted a safety standard for human exposure to RF en­ergy. Proper operation of this radio under normal conditions results in
user exposure to RF ener gy bel ow the Occ upati onal Safet y and Healt h
Act and Federal Communication Commission limits.

WARNING

DO NOT allow the antenna to touch or come in very close proximity
with the eyes, face, or any exposed body parts while the radio is trans­mitting.

DO NOT operate the transmitter of a mobile radio when a person out­side the vehicle is within one (1) meter of the antenna.

DO NOT operate the transmitter of a stationary radio (base station or
marine rad io) when a person is within one (1) meter of the antenna.

DO NOT operate the radio in explosive or flammable atmospheres.
The transmitted radio energy could trigger blasting caps or cause an
explosion.

DO NOT operate the radio without the proper antenna installed.

DO NOT allow children to operate or play with this radio.

NOTE: The above warning list is not intended to include all hazards
that may be encountered when using this radio.

This device complies with Part 15 of the FCC rules. Operation is sub­ject to the condition that this device does not cause harmful interfer­ence. In addition, changes or modifications to this equipment not

expressly approv ed by the E.F. Johnson Company could void the user’ s
authority to operate this equipment (FCC rules, 47CFR Part 15.19).

4

SAFETY INFORMATION

FCC EXPOSURE LIMITS

This mobi le radio transceiver was tested by the man ufacturer with
an appropriate antenna in order to verify compliance with Maximum Per­missible Exposure (MPE) limits set under Section 2.1091 of the FCC
Rules and Regulations. The guidelines used in the evaluation are derived

from Table 1 (B) titled “Limits For General Population/Uncontrolled
Exposure” which is from FCC report OET bulletin #65.

Table 1

FCC Limits for Maximum Permissible Exposure (MPE)

(A) Limits For Occupational/Controlled Exposure

Frequency Range

(MHz)

0.3-3.0 614 1.63 (100)* 6

3.0-30 1842/f 4.89/f (900/f
30-300 61.4 0.163 1.0 6
300-1500 -- -- f/300 6
1500-100,000 -- -- 5 6

Electric Field

Strength (E)

(V/m)

Magnetic Field

Strength (H)

(A/m)

Power Density

(S)

(mW/cm2

2

)* 6

2

)

Time |E|

Averaging

S (minutes)

(B) Limits For General Population/Uncontrolled Exposure

2

)

Time |E|

Averaging

S (minutes)

Frequency Range

(MHz)

0.3-1.34 614 1.63 (100)* 30

1.34-30 824/f 2.19/f (180/f
30-300 27.5 0.073 0.2 30
300-1500 -- -- f/1500 30
1500-100,000 -- -- 1.0 30
f = Frequency in MHz *Plane-wave equivalent power density

Electric Field

Strength (E)

(V/m)

Magnetic Field

Strength (H)

(A/m)

Power Density

(S)

(mW/cm2

2

)* 30

2,

2,

|H|2,

|H|2,

Table 2 lists the antenna whips and bases recommended for use in
each frequency ra nge. Each model of this r adi o was te st ed wi th the appro­priate antenna listed. The antenna was mounted in the center of the roof

5

SAFETY INFORMATION

of a domestically manufactured 4-door passenger sedan. The radio manu­facturer has deter min ed that the user and servi ce pers onnel sh ould re main
one (1) meter in distance away from the antenna when transmitting. By
maintaining this distance, these individuals are not exposed to radio fre­quency energy or magnetic fields in excess of the guidelines set forth in
Table 1.

NOTE: If the installer or user changes the type or location of the
antenna, they should be aware of the MPE guidelines shown in
Table 1 and take measures to comply with those guidelines.

Tab le 2

Recommended Antenna Whips and Bases

(Antenna Manufacturer - Antenna Specialists)

Frequency Whip Model No. Base Model No.

136-144 MHz ASPJ1415 KM220
144-152 MHz ASPA1415 KM220
152-162 MHz ASP B1 415 KM220
162-174 MHz ASP C1 415 KM220
400-430 MHz ASPE1615 KM220
430-470 MHz ASPD1615 KM220

470--512 MHz ASPF1615 KM220

806-869 MHz ASPA1855 KM220
890-960 MHz ASPG1865 KM220

6

TABLE OF CONTENTS

TABLE OF CO NTENTS

SAFETY INFORMATION
QUICK REFERENCE GUIDE
FEATURES
CONTROLS AND DISPLAY

Front Panel Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Rear Panel Jacks and Connectors. . . . . . . . . . . . . . . . . . . . . . . . . . .13

Display Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

GENERAL OPERATION

Power-Up Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Determining Volume Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Backlight Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

System/Group Display Information . . . . . . . . . . . . . . . . . . . . . . . . .16

Numeric Display Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Alpha Tag Display Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Selecting the System and Group. . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Setting Squelch Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

STANDARD CALLS

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Placing a Standard Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Receiving a Standard Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

TELEPHONE CALLS

Placing Telephone Calls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

Receiving a Telephone Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Landside-Originate Calls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

GENERAL FEATURES

Bank Select. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Call Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

Emergency Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

Encryption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

Function (FCN) Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

Home System/Group Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

Horn Alert. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

Option Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

Power Turn-Off Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Proceed (Clear-To-Talk) Tone . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

Receive-Only Groups. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

Stealth Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

Time-Out Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

7

TABLE OF CONTENTS

Tone Select. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

Transmitter Thermal Foldback. . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

OPTION SWITCHES AND MENU MODE

. . . . . . . . . . . . . . . . . . .30

Option Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

Menu Mode Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Using Menu Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

SYSTEM AND GROUP SCAN

. . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

Scan List Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

Scan Delay and Continue Timers. . . . . . . . . . . . . . . . . . . . . . . . . . .36

Transmitting In The Scan Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . .36

LTR AND CONVENTIONAL MODES

. . . . . . . . . . . . . . . . . . . . . . . 38

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

LTR Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

Conventional Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

Monitoring Conventional Channels Before Transmitting . . . . . . . .39

LTR FEATURES

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

Standard and Telephone Calls . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 0

Calls on Priority and Block ID Codes . . . . . . . . . . . . . . . . . . . . . . .40

Transmit Inhibit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

Busy Queuing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

System Search . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

Transpond. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

CONVENTIONAL FEATURES

. . . . . . . . . . . . . . . . . . . . . . . . . . . . .44

Monitor Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44

Transmit Disable On Busy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44

Talk-Around. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45

Call Guard Squelch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46

Priority Group Sampling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46

MISCELLANEOUS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

Supervisory Tones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

LTR Telephone Call Tones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49

Display Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50

Menu Mode Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

System Operator Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . .53

Speaking Into Microphone. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 3

Operation At Extended Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

Preventing Battery Discharge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

Licensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

Transceiver Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

8

QUICK REFERENCE GUIDE

QUICK REFERENCE GUIDE

Red - Transmit

Amber - Transmit (Reduced Pwr)
Green - Busy Conv. Group (Channel)

On-Off/Volume

(Press/Rotate) (Press/Rotate)

Select Switch

System Scan

List

Phone

ID

Horn

Alert

Encryption

Scan

Selected

Option

Group Scan

Monitor

Call

List

Priority

Group

Power On/Off - Press on-off/volume control.
Set Volume Level - Rotate on-off/volume control.
Change System or Gr oup - Press Sel ect switch to ena ble system or group

select mode (indicated by ←/→ or __). Then rotate Select switch to
select desired system or group (see page 17).

Select Menu Mode - Press FCN twice then rotate/press Select switch as

required to display/select desired parameter (see page 30).

Select Home System/Group - Press FCN then the Select switch.
Scan On/Off - Press SCAN switch . Sca n on = , Scanning occurring =

scrolling underline (see page 33).

Program System or Group Scan List - Press Select switch to enable

system or group programming mode (same as when changing system
or group), then press A/D switch. System in list = , Group in list =

(see page 35).

Set Squelch Level (Conv. Only) - Press FCN, then rotate Select switch

with conventional system selected (see page 18).

Monitor Before Transmitting (Conv. Only) - T ake microphone off-hook

to enable monitor mode (indicated by ). Channel is busy if indicator
is green or someone is talking (see page 39).

9

FEATURES

FEATURES

General Features

• Up to approximately 100 1-group or 40 16-group systems

programmable

• LTR® and conventional operation

• Unique 8-character system and group identification tags

• System and group scan

• User programmable system and group scan lists

• Menu mode to control various functions

• Five programmable option switches

• Up to 16 banks selectable

• Proceed (clear-to-talk) tone

• Call indicator

• Time-out timer

• Horn alert

• Emergency switch

• Receive-only groups

• Companding and encryption (optional)

LTR Features

• Busy queuing (telephone calls only)

• System search (telephone calls only)

• Transpond

• Transmit inhibit

• Receive priority calls

Conventional Features

• Busy indicator

• Talk-around

• User-adjustable squelch level

• Call Guard® squelch control

• First and second priority channel sampling

• Monitor mode and Transmit disable on busy

NOTE: Dealer programming determines the availability of many of the
pre ced ing feature s.

10

CONTROLS AND DISPLAY

CONTROLS AND DISPLAY

Transmit/Busy

Indicator

Microphone

Jack

Option Switches

On-Off/Volume

Front Panel Controls

Speaker

Select Switch

On-Off V olume - Pressing this knob turns power on and off. The ve hic le

ignition switch may also control power as described in “Power Turn-Off
Delay” on page 27. Rotating this knob sets the speaker volume (see
page 15).

Select Switch - This switch changes the selected system or group and is
also used for other functions such as selecting parameters in the menu
mode. To change the system or group, press this knob to switch between
the system and group select modes, and then rotate it to increase or
decrease the sys tem o r g rou p. Refer to “Selecting the System and Gr oup”
on page 17 for more information.

This switch also has two alternate functions that are selected by first
pressing the FCN switch. Refer to the FCN switch description which
follows for more information.

11

CONTROLS AND DISPLAY

Option Switches - The five front panel option switches can be
programmed by your system operator for the functions which follow.
Refer to the section indicated for more info rmation on a function. The
key cap usually indicates the function controlled by the switch.

A/D - Scan lis t add/delete (see p age 35)
CG - Call Guard squelch disable (see page 46)
EMER - Emergency switch (see page 24)
ENCPT - Encryption on-off (see page 24)
FCN - Function select (see following description)
HORN - Horn alert on-off (see page 26)
MON - Monitor mode on-off (see page 39)
AUX - Option select (see page 27)
PRI - Priority sampling on-off (see page 46)
SCAN - Scan on-off (see page 33)
STLH (AUX) - Stealth mode select (see page 29)
TA - Talk-around on-off (see page 45)
(Blank) - Not used (disabled)

FCN (Function) Switch - This switch (if programmed) selects the

following functions:

Menu Mode Select
Home Sys/Grp Select
Conv Squelch Set

- Press FCN twice (see page 30)

- FCN/press Select switc h (see page 26)

- FCN/rota te Select switch (see page 18)

Transmit/Busy Indicator - Indicates the foll owing conditions:

Red

- Transmitter keyed, normal power output

Orange

- Transmitter keyed, power reduced because internal

temperature is high

Green

- Busy conventional group (channel). Refer to “Conventional

Operation” on page 38 for more information.

Microphone Jack - Connection point for the microphone.

Microphone Push-To-Talk (PTT) Swi tch (Not Shown) - Push-button on

the microphone which is pressed to key the transmitter.

12

CONTROLS AND DISPLAY

Speaker - The internal speaker is located behind the grille. An optional
speaker can be conn ected to th e external spe aker jack located on t he back.

See “Speaker Jack” description which follows.

Antenna

Jack

Power

Jack

Speaker

Jack

Rear Panel Jacks and Connectors

Antenna Jack - Miniature UHF jack for connecting the 50-ohm antenna.

Power Jack - Conne ct ion point for the power cabl e wh ich attaches to th e

vehicle battery. A nominal 12-volt DC, negative ground power source is
required.

Speaker Jack - Connection point for an optional exter nal 4.7-ohm, 5-watt
speaker. The internal speaker is automatically disabled when a speaker is
plugged in to this jack.

Accessory Cable (Not Shown) - This optional cable is used to connect
functions such as ignition switch sense and horn alert to the transceiver.

Data Cable (Not Shown) - This optional cable is used to connect data
equipment such as modems and data terminals to the transceiver.

13

CONTROLS AND DISPLAY

System Scan

List

Encryption

Phone

ID

Horn

Alert

Scan

Selected

16-Character

Message Area

Call

Priority
Groups

Option

Display Description

Group Scan

List

Monitor

16-Character Message Area - Indicates the selected system and group
(see page 16) and also error conditions and status information.

- Indicates that the displayed system is in the scan list and scanned

normally (see page 35).

- Indicates that the displayed group is in the scan list and scanned

normally (see page 35).

- Indicates that the sele cte d g rou p i s programmed for telephone calls

(see “TELEPHONE CALLS” on page 21).

- Indicates that optional encryption is enabled (see page 24).

- Indicates that the horn alert is enabled (see page 26).

- Indicates that scanning is enabled (see page 33).

- Indicates that an option controlled by the AUX switch is enabled

(see page 24).

14

GENERAL OPERATION

- Indicates that a call has be en r ece iv ed on a group programmed f or a

call indicator (see page 24). To turn this indication off, press any key.

- Indicates that t h e monitor mode is enab led . This mode dis abl es Call
Guard squelch and other squelch control features so that all messages are
heard on conventional systems (see page 44).

- When only is displayed, the selected or displayed group is
scanned as a first priority group. When is displayed, it is scanned as a
second priority group (see page 46).

GENERAL OPERATION

Power-Up Sequence

When power is turned on, the backlight turns on, all segments in the
display are momentarily enabled, and the last seven digits of the trans­ceiver part number are very briefly displayed. A beep then sounds (if
tones are enabled) and the transceiver is ready to be used.

Determining Volume Level

The relative vo lume se tting ca n be d etermi ned by notin g the posit ion
of the index on the volume knob. You may also be able to enable a refer­ence tone or background noise for use in setting the volume. Proceed as
follows:

• If key press tones are enabled, a short tone sounds when an option

switch is pressed or the Select switch is pressed or rotated.

• If a conventional system is s elected, take the mi crophone of f-h ook and

if someone is using the channel, voice is heard. If no one is using the
channel, the squelch control can be adjusted counterclockwise as

described in “Setting Squelch Control” on page 18 and noise is heard.
It is not possible to unsquelch the transceiver in this manner when an
LTR system is selected.

15

GENERAL OPERATION

Backlight Operation

The display and keypad backlight can be controlled by the BACK­LIGHT menu parameter (see page 38). The three states that can be
selected are Bright, Dim, and Off. If this menu parameter is not select­able, the backlight is fixed in one of these states by programming.

System/Group Display Information

The currently sel ect ed system and group are dis played using either a
Numeric or Alpha Tag display mode. The display mode is selectable if
the S/G DISPL menu parameter is available (see page 32). Otherwise, it
is fixed in one of thes e modes by pr ogr amming. These modes function as
follows:

Numeric Mode

- In the numeric mode, the selected system and group
numbers are displayed on the top line as Sxx and Gxx, and the group
alpha tag is displayed on the bottom line. For example, System 1, Group
2 (CAR 220) is displayed as follows. The system alpha tag is not
displayed in this mode.

System Number

Group Number

Group Alpha Tag

Numeric Display Mode

Alpha Tag Mode

- In the alpha tag mode, the system alpha tag is

displayed on the top line and the group alpha tag is displayed on the

bottom line. For example , a “SECURI TY” sys te m and “CAR 220 ” gr oup
are displayed as follows. The system and group numbers are not
displayed in this mode.

16

System Alpha Tag
Group Alpha Tag

Alpha Tag Display Mode

GENERAL OPERATION

Selecting the System and Group

The front panel Select switch is used to change the system and
group. Pressing this switch toggles between the system and group select
modes, and then rotating it increases or decreases the system or group.

In the Numeric di splay mode (se e prec eding de scri ption) , the s ystem

select mode is indicated when the arrow points to “Sxx”, and the group
select mode is indicated when it points to “Gxx” (see following diagram).

System Select

Mode

Group Select

Mode

Select Mode Indication With Numeric Display

In the Alpha Tag display mode, the system select mode is indicated
by an underline in the left-most character position of the system alpha
tag. Likewise, the group select mode is indicated by an underline in the
left-most position of the group alpha tag (see following diagram).

System Select

Mode

Group Select

Mode

Select Mode Indication With Alpha Tag Display

The transceiver can be programmed so that after a change is made,
the current select mode remains enabled or a default mode is selected
after a delay of up to 15 seconds. This programming also controls the
mode that is selected when power is turned on.

17

GENERAL OPERATION

Setting Squelch Control

NOTE: This procedure sets the squelch level used for conventional calls
only. The squelch level for LTR calls is preset and not affected by this
adjustment. For more information on the various operating modes, re fer
to page 38.

If conventional systems are programmed, the squelch level can be
set if the FCN option switch is enabled. Proceed as follows:

1. Select a conven tional system an d then a group that i s not busy . Take the

microphone off-hook to enable monitoring.

2. Press the FCN s wit ch and t h en ro tat e th e Se lect switch as you woul d a

normal squelch con trol. Rotate i t counterclockwi se until recei ver noise
is heard and then clockwise slightly past the point where the noise

mutes. The squelch adjust mode is indicated by “SQUELCH” on the
upper line of the display, and the relative squelch level is indicated by
a bar graph on the bottom line.

3. To select the current level and exit this mode, press the Select switch.

This also occurs automatically 2 seconds after no change is made or 8
seconds after no activity.

4. If both narrow and wide band channels are used, perform this adjust-

ment on both types because separate settings are maintained.

NOTE: Some readjustment may be required if weak messages are not
heard or unsquelching occurs when no messages are present.

18

STANDARD CALLS

STANDARD CALLS

Introduction

Most calls you make are pro bably th e standa rd type des cribe d in this
section. These calls are between you and another mobile or control
station. The main difference between these calls and the other type that
can be placed (telephone calls) is that no number is dialed using a
keypad. The following procedure applies to both LTR and conventional
operation.

Placing a Standard Call

1. Turn t ransceiver power on and set th e volu me as des cri be d sta rt ing on

page 15. W ith convention al operation, als o set the squelch as described
on page 18.

2. Select the s yst em and group of the mobi le being called a s d esc ribed in

“Selecting the System and Group” on page 17.

3. If a conventional cal l is being placed, monito r the channel manually or

automatically as described on page 39.

4. Press (and hold ) t he mi cr ophone PTT (push-to-t alk) switch to tal k a nd

release it to list en. Operat ion wit h LTR and conventional sys tems is as
follows:

LTR Operation

• If the proceed tone is enabled (see page 28), it sounds shortly after

the PTT switch is pressed to indicate that the radio system was
successfully accessed. If the proceed tone is not enabled, no tone
sounds when the system is successfully accessed. The proceed and

other tones can be dis abled as de scribed in “T one Select” o n page 30.

• If the radio system is busy, the busy tone sounds (see page 47) and

“BUSY” is indicate d on the lower line of the display . I f you continue
pressing the PTT switch, the system is accessed when it becomes
available.

19

STANDARD CALLS

• If an out-of-range condition exists, the intercept tone sounds (see

page 47) and “OUT-RNGE” is indicated on the lower line of the
display. No more access attempts are made once this indication
appears. Release the PTT switch and drive closer to the radio system
or away from shielding structures and try again.

Conventional Operation

• If the channel is busy and the Transmit Disable On Busy feature is

programmed, “DSBL BSY” is indicated on the lower line of the
display, the busy tone sounds, and the transmitter is disabled (see
page 44).

• Otherwise, busy and out-of-range conditions are not indicated and

speaking can be gin when th e PTT switch is pressed after monitorin g
the channel. I f th e proc eed to ne is ena bled o n conve ntiona l sys tems,
it indicates when speaking can begin but does not indicate that the
radio system has been successfully accessed.

5. When the call is complete, place the microphone back on-hook.

Receiving a Standard Call

1. Turn t ransceiver power on and set th e volu me as des cri be d sta rt ing on

page 15. W ith convention al operation, als o set the squelch as described
on page 18.

2. Select or sca n the s ystem an d group p rogrammed for t he c all you want

to receive (see page 33 for scan information).

3. When the message is received, the display usually changes to the

system and group of the call. Take the microphone off-hook and press
the PTT switch to talk and release it to listen. If scanning, a response
may not automatically occur on the group of the call (see page 36).

20

TELEPHONE CALLS

TELEPHONE CALLS

Placing Telephone Calls

NOTE: Telephone calls can be placed and received only if that service is
available to you and your transceiver has been programmed appropri­ately. A microphone equipped with a telephone keypad is required to dial
the telephone number.

The telephone calling feature allows you to place and receive tele­phone calls using your transceiver. The following information describes
how these calls are made with LTR operation. If you can make telephone
calls with conventional operation, the procedure may be somewhat
different and your system operator will then provide additional informa­tion. Proceed as follows:

1. Turn t ran sce iver power on and set the volume as des cri be d sta rt ing on

page 15.

2. Select the system and group programmed for telephone calls. When a

telephone group is selected, is displayed.

3. T o obtain the dial tone, briefly press the P TT switc h. If the proceed tone

is used, press the PTT switch until a beep sounds. If a dial tone is then
heard, proceed to step 4.

Busy and Out-Of-Range Conditions

Busy and out-of-range conditions are indicated the same as with LTR
standard calls des cr ibe d o n page 19. The following additional fea tu res
may be available with telephone calls:

Busy - If Busy Queuing is programmed (see page 42), the call is auto­matically placed in a queue when the PTT switch is released. The

Busy Queuing mode is indicated by “IN QUEUE” in the display.

21

TELEPHONE CALLS

Out-of-Range - If the System Search feature is selected (see page 42),
that feature is automaticall y selected when the PTT switch is released.

The System Search mode is indicated by “SYS SRCH” in the display.

4. Wit h t he dia l ton e s ound ing, dial the numbe r using the 0-9 ke ys on the

microphone keypad. If the microphone has a memory , you may also be
able to recall t he number from memory. The PTT swit ch does not need
to be pressed while you are dialing if the transmitter automatically
keys. If too much time elapses between digits, the call is terminated.

5. After the number is dialed, release the PTT switch (if it was pressed).

Landside ringing (or a landside busy condition) should then be heard.

6. When the other party answers, press the PTT switch and respond. The

PTT switch must be pressed to talk and released to listen (the same as
with mobile-to-mobile calls).

7. When the call is finis hed, it should be t ermin ated . This is usual ly done

by pressing the # key, and termination is indicated by three beeps.
Terminating the call in this manner prevents extra bi lling that may
occur while the system automatically detects the end of the call.

Receiving a Telephone Call

1. Turn t ransceiver power on and set th e volu me as des cri be d sta rt ing on

page 15.

2. Select or scan the system and group programmed for telephone calls.

When a telephone group is selected, is displayed.

3. When “ringing” is heard, press the PTT switch and respond. The PTT

switch must be pressed to talk and released to listen the same as with
standard calls.

4. When the call is finished, it should be terminated as in step 7 of the

preceding section.

22

GENERAL FEATURES

Landside-Originate Calls

Calls can be placed from a landside telephone to your transceiver if
the radio system and transceiver have that capability. With most systems,
a mobile can be called directly (each has a unique telephone number).
With others, a mobile may be called as follows:

1. Dial the number of the radio system in which the mobile is operating.

2. When the system answers, a short tone sounds to indicate that the

number of the mobile should be dialed. This number is usually five
digits long and is suppl ied by your s ystem operator. The first two digits
are the home repeater number and the other digits are the group ID of
the mobile being call ed. This number must be dial ed usin g a tone- type
telephone. If too much time elapses before dialing i s started or between
dialed digits, the call is termi nated.

3. Ringing is then heard by the landside caller while the mobile is being

rung.

GENERAL FEATURES

Bank Select

A bank is a col l ect io n of selectable sys tems t hat ha ve been set up for
a specific application. For example, one bank could be programmed for
operation in Minneapolis and another for operation in Milwaukee. Each
bank is identified by a unique alpha tag, and up to sixteen banks can be
programmed.

Banks ar e selected by the BA NK SEL menu parameter (see

page 32). Rotate the Select switch to display “BANK SEL” on the top
line and the current bank is then displayed on the bottom line. Press the
Select switch to change the bank. If this menu parameter is not available,
banks are not selectable.

23

GENERAL FEATURES

Call Indicator

The call indicato r is “ C” in the upper part of the display as shown in
the following illustration. The purpose of this indication is to show that a
call was received while you were away from the vehicle. Individual
groups can be programmed for this feature and it then turns on when a
call is received on one of those groups.

Call

Indicator

This indicator is turned off by pressing any button or turning trans­ceiver power off and then on. If scanning and the “last received” configu­ration is programmed (see “Transmitting In The Scan Mode” on
page 36), the system and group of the last call are displayed. Otherwise,
the currently selected system/group is displayed.

Emergency Switch

If the EMER option switch is programmed (see page 30), it is used
to set up a high priority call. When this switch is pressed,
“EMERGNCY” is displayed on the lower line (unless this message has
been disabled by programming) and a preprogrammed emergency
system/group is selected. However, no call is automatically placed. This
access mode minimizes, as much as possible, the chance that the system
will be busy when the call is placed by pressing the PTT switch. If you
have an EMER switch, consult your system operator for more informa­tion on how to use it.

Encryption

Voice encryption is an optional feature that prevents conversations
from being monitored by casual eavesdropping and analog scanners. It
does this by encrypting your voice so that it can be understood only by
someone using a transceiver equipped with similar encryption device.

24

GENERAL FEATURES

Each group can be programmed so that when it is selected, encryp­tion is aut omatically enabled. When encryption is e nabled, is indi­cated in the display as shown below.

Encryption

Indicator

If you have the ENCRYPT menu parameter or ENCPT option
switch, the encryption group programming can be temporarily over­ridden. Selecting another system or group causes encryption to revert to
the status programmed for that group.

Encrypted calls are received even if encryption is not enabled.
However, encryption must be enabled to transmit an encrypted call.
When transmitting an encryp ted call , wait appr oximate ly 1 second bef ore
speaking. This gives the receiving encryption device time to establish
synchronization which ensures that all of the first word is received. If the
proceed tone is used (see page 28), speaking can begin as soon as it
sounds because it is delayed for the required time.

Function (FCN) Switch

If an option switch is programmed for FCN (function), it performs
the following fu nct ions. If this swi tc h i s not programmed, the se functions

are not available. When the function select mode is active, “FCN” is
displayed on the l ower lin e of t he di spl ay. The function mode is automa ti ­cally exited after 8 seconds of no activity.

Menu Mode Select

- Pressing FCN twice selects the menu mode as

described on page 32.

Home System/Group Select
selects the home system/group as described in the next section.

- Pressing FCN and then the Select switch

25

GENERAL FEATURES

Squelch Adjust - Pressing FCN and then rotating the Select switch with a
conventional system selected sets the squelch level as described on
page 18.

Home System/Group Select

To select the preprogrammed Home system/group, simply press the
FCN switch and then the Select switch. The Home system/group is then
displayed and it becomes the selected system/group. If no home group
has been programmed, the last selected group of the home system is
selected. If you do not have a FCN switch, or if no Home system is
programmed, this feature is not available.

Horn Alert

If this fe at ure ha s been installe d by your system op er ator, i t activates
an external alert such as the vehicle horn or lights when a call is received
on a group programmed for horn alert. When the horn alert is enabled,

is displayed as shown in the following illustration.

Horn Aler t

Enabled

When enabled, the horn alert pulses on and off for 1-8 cycles and
then goes back to the disabled s tate. To change the currently sel ected horn
alert mode, the HORN option switch or HRN ALRT menu parameter can
be used if available (see page 30).

The horn alert is programmed to operate in the manual or automatic
mode (see descriptions which follow). If the ignition switch does not
control transceiver power, only the front panel power switch affects oper-

ation when applicable. Refer to “Power Turn-Off Delay” on page 27 for
more information.

26

GENERAL FEATURES

Manual Off/On Mode

The horn alert mode does not change when power is turned on and
off by eithe r the ignition swi tch or power swit ch. Therefore, th e horn alert
is entirely controlled by either the HORN option switch or menu
parameter.

Auto Off/On Mode

Ignition Switch - The horn alert a lways tu rns of f whe n the ign ition switch
is turned on, and always turns on when the ignition switch is turned off (if
there is a turn-off delay).

Power Switch

- The horn alert always reverts to the off condition when

power is turned on by the power switch.

NOTE: The preceding automatic operation overrides any mode that may
have been selected by the HORN option switch or HRN ALRT menu
parameter.

Option Select

The AUX option switch or OPTION menu parameter can be used to
control an accessory that may have been installed by your system oper­ator. If the switch is used, the enabled condition is indicated by in the
display.

Power Turn-O ff Delay

Your transceiver may have bee n ins ta ll ed so t hat the vehi cle igni ti on
switch as well as the front-panel power switch control transceiver power.
If this is the case, both the i gnition switch and the front pane l power
switch must be on for transceiver power to turn on.

When the ignition switch contr ols power, turn-off delays of Imme­diate, 10, 20, 30, 40, or 50 minutes, 1, 2, 4, 8, 10, 12, or 16 hours or
Forever can be programmed. The delay can be overridden at any time by
turning power off using the front-panel power switch or turning the igni­tion switch back on.

27

GENERAL FEATURES

A power turn-of f delay allows features such as the horn a lert and call
indicator to remain active for a time after the ignition switch is turned off.
At the same time, advantages of ignition switch control are utilized such
as preventing battery discharge that may occur if the transceiver is acci­dentally left on for an extended period (see page 54).

Proceed (Clear-To-Talk) Tone

This is a short tone that sounds shortly after the PTT switch is
pressed to indicate that the radio system has been accessed and speaking
can begin. This tone can be programmed so that it sounds on LTR
systems but not conventional systems. In addition, this and other tones

can be disabled on all systems by the T ONES men u par ameter (s ee “Tone
Select” on page 30) or system operator progra mming. Eit her a sta ndard or
loud (two-pitch) tone can be programmed.

On LTR systems, if the radio system is busy when maki ng a ca ll , the
busy tone sounds i nstead of the pr oceed t one and “ BUSY” is indica ted on
the botto m line of the display. If the PTT switch is held down, the system
is accessed and the proceed tone sounds when it is no longer busy. If an
out-of-range condition occurs, the intercept tone sounds and “OUT­RNGE” is indicated in the display. The PTT switch must be released to
make anothe r call attempt. Refer to p age 47 for more information on the
busy and intercept tones.

On conventional sy st ems, th e Transmit Disable On Busy feature can
be used to automatically perform monitoring (see page 44). The proceed
tone then does not sound if the channel is busy. Otherwise, the proceed
tone (if enabled) sounds on conventional systems even if the channel is
busy.

With all operating modes, if encryption is used, a 0.9-second delay
occurs before this tone sounds and two beeps are heard instead of one. A
short delay may also occur with conventional calls. These delays ensure
that the radio path is complete before you begin talking so that part of
your first word is not lost.

28

GENERAL FEATURES

Receive-Only Groups

Any group can be programmed for monitoring only (transmitting is
disabled). If the PTT switch is pressed with one of these groups selected,

the intercept tone sounds and “TX DSBL” is displayed.

Stealth Mode

The stealth mode disables the following tones and indicators so that
they do not reveal that you are transmitting or otherwise indicate your
presence. The speaker audio and display remain enabled in this mode.

• All tones (see “Tone Select” on page 30)

• The front panel transmit/busy indicator (see page 16)

• Display backlight

The stealth mode can be selected by an option switch or the
STEALTH menu parameter (see page 32), or is fixed in the on or off
mode by programming. There is no special indication that this mode is

selected except “On” is displayed under “STEALTH” in the menu mode.

Time-Out Timer

The time-out timer disables the transmitter if it is keyed continu­ously for longer than the programmed ti me. It can be pro gramme d for 0.5

- 5.0 minutes or di sab led entirely. If the transmitter is keyed continuously
for longer than the programmed time, the transmitter is disabled,
“TIMEOUT ” is indicated on the lower line of the display, and the inter­cept tone sounds. The timer and tone are reset by releasing the PTT
switch. Ten seconds before time-o ut occurs, a beep sounds to indica te that
time-out is approaching. There is also a timer that can be programmed to
prevent transmitting for up to one minute after time-out occurs.

One use of the time-out timer feature is to prevent a repeater from
being kept busy for an extended period by an accidentally keyed trans­mitter. It can also prevent possible damage to the transmitter caused by
transmitting for an excessively long period.

29

OPTION SWITCHES AND MENU MODE

Tone Select

If the TONES menu parameter is selectable, the tones that sound can
be selected. Otherwise, the tones that sound are fixed by programming.
The following choices are available. Refer to page 32 for more informa­tion on using the menu mode.

Silent - All tones are disabled.
Key Beep - Only the Select switch and key press tones are enabled.
Alert - All tones except the preceding Key Beep tones are enabled.
All Tones - Both the Key Beep and Alert tones are enabled.

Transmitter Thermal Foldback

If the tra nsmitt er te mper ature in creas es to th e poin t where d amage t o
the transceiver could result , power is automatica lly cut back. When th is
happens, the transmit indicator on the front panel is orange instead of red
when the transmitter is keyed. After sufficient cooling occurs, power
output returns to the normal level and the indicator changes back to re d.
One time when this indication could occur is if you transmit for an
extended period.

OPTION SWITCHES AND MENU

MODE

Option Switches

All five option switches on the front panel are programmable by
your system operator. The available option switch and menu mode func­tions are shown in the table on page 31. Those which can be assigned to

an option switch are indicated by an entry in the “Option Switch”
column. Refer to the page listed in this table for a description of the func­tion. If a function is controlled by an option switch, it cannot be
controlled by the menu mode and vice versa. Some switches may not be
used.

30

OPTION SWITCHES AND MENU MODE

Menu Mode and Option Switch Functions

Option

See Descrip.

Function Menu Items

Switch

on Page

Add/delete (scan list prg) --- A/D 35
Backlight adjust BACKLGHT --- 16
Bank select BANK SEL --- 23
Call Guard Sq. disable --- CG 46
Emergency --- EMER 24
Encryption on-off ENCRYPT ENCPT 24
Function select --- FCN 25
Home sys/grp select --- FCN then

26

press Sel Sw
Horn Alert on-off HRN ALRT HORN 26
LTR system search SYS SRCH --- 42
Menu mode select --- FCN (twice) 32
Monitor mode select - -- MON 44
Option select OPTION AUX 27
Priority sampling on-off PRIORITY PRI 46
Scan on-off --- SCAN 33
Scan type select SCN TYPE --- 33
Scan continue on-off SCN CONT --- 36
Scan list save mode SCN SAVE --- 35
Stealth mode select STEALTH STLH 29
Squelch adjust --- FCN then

18

rotate Sel Sw

System/group display

S/G DISPL --- 16

mode
Talk-around on-of f TALKARND TA 45
Tone type select TONES --- 30

NOTE: Parameters left blank are not available.

31

OPTION SWITCHES AND MENU MODE

Menu Mode Introduction

The menu mode is selected b y pre ssing the FCN switch t wice. If this
switch is not programmed, the menu mode is not available. Functions
which can be controlled by the menu mode are indicated by an entry in

the “Menu Items” column of the t able on page 31. Re fer t o the page l iste d
in the table for a description of the function. Some functions may not be
used, may be in a fixed state, or may be controlled by an option switch.
The menu parameter that controls that function is then not displayed.

Using Menu Mode

To use the menu mode, proceed as follows:

1. To select the menu mode, press the FCN switch twice. The menu

display follows. The top line indicates the function being edited, and
the bottom line indicates the current status of that function.

Function

Status

2. T o display the various functio ns that are contr ollable by the menu mod e

(top line indication), rotate the Select switch. The currently selected
status of that function is displayed on the bottom line.

3. To change the selected status, press the Select switch. The selections

displayed for each menu function are shown on page 52.

4. To display another menu function, rotate the Select switch. Then

change the status if desired as described in the preceding step.

5. The selected status condit ions for th e various f unctions ar e saved when

the menu mode is exited in one of the following ways:

32

SYSTEM AND GROUP SCAN

• Pressing the FCN switch again

• Pressing the PTT switch

• Automatically when time-out occurs 2 seconds after a change is

made or 8 seconds after no changes are made.

NOTE: Calls cannot be received or transmitted while the menu mode is
selected.

SYSTEM AND GROUP SCAN

Introduction

The scan feature monitors, in sequence, the programmed systems
and/or groups in the scan list. When a message is detected that the trans­ceiver is programmed to receive, scanning stops and the message is
received. Short ly after the me ssage is complet e, scanning r esumes (unle ss
it has been disabled).

System Scanning
in the system scan list. When system scanning is not used, calls are
detected on only the currently selected system.

Group Scanning
the current or scanned systems that are in the group scan list. When group

scanning is not used, calls are detected on only the currently selected
group or if system scanning, on the last selected group of each system.

System and/or group scanning are turned on and off by the SCAN
option switch. When system and/or group scanning is enabled by this
switch, is indicated in the display (see following illustration). Then
when system or group scanning is actually occurring, a scrolling under­line is displa yed under each c haract er in th e uppe r line of the dis pla y. The
microphone must be on-hook for scanning to occur (unless off-hook
detection has been disabled by programming).

- System scanning detects calls on all systems that are

- Group scanning detec ts ca lls o n all selec table groups in

33

SYSTEM AND GROUP SCAN

System Scan List Group Scan List

System or Group

Scanning Selected

System or Group

Scanning Occurring

The type of scanning selected is determined by the menu mode SCN
TYPE parameter (see page 32). If that parameter is not selectable, the
type of scanning is f ixed by progr amming. The avai lable sca n types are as
follows.

SYS-GRP - Both system and group

GRP ONLY - Group scanning only

OFF - Both types disabled (SCAN switch non-functional)

If the SCAN option switch is not programmed, the selected mode is
always enabled. If the switch is enabled but the menu SCN TYPE param­eter is not selectable, the scan type is fixed by programming.

Group scanning can be selectively disabled on systems by program­ming. It then does not occur on those systems even if enabled as just
described. The s el ect ed s yst em an d gr oup can be changed while sca nni ng
using the Select switch in the normal manner. Scanning resumes shortly
after the change is made.

When a call is received in the scan mode, the display changes to the
system and group of the call. Programming determines if this change is
temporary (until scanning resumes) or permanent, and if a response
occurs on the sys tem/group of the call or t he select ed system/gr oup. Refer

to “Transmitting In The Scan Mode” on page 36 for more information.

34

SYSTEM AND GROUP SCAN

Scan List Programming

General

NOTE: The selected (displayed) system and group are always scanned,
even if they are deleted from the scan list.

The system and group scan lists are programmed using the A/D
(add/delete) option switch. Pressing this switch changes the status of the
displayed system or group. The displayed system is in the scan list and
scanned normally when is displayed. Likewise, the displ ayed gro up is
in the scan list and scanned normally when is displayed (see
preceding illustration).

The system/group select mode described on page 17 also controls if
the system or group scan list is changed when the A/D switch is pressed.
For example, to change the scan list status of the displayed system, press
the Select switch if necessary so that the system select mode is indicated
and then press the A/D switch.

Deleting a system only temporarily deletes the groups associated
with that system. When a system is added back into the scan list, the orig­inal group scan list is again active. Systems and groups can be deleted
from the scan list while listening to a message on the system or group by
pressing the A/D switch in the normal manner. Scanning resumes shortly
after the system or group is deleted.

Scan list programming is not available if the A/D switch is disabled.
In addition, the gr oup scan list is not p rog rammable if the gro up s canning
is disabled on the current system. If an attempt is made to program the

group scan list on one of these systems, a beep sounds, “GSCN DIS” is
flashed in the display, and no change occurs in the scan list.

Saving Scan List

If the menu mode SCN SAVE parameter is available, you can select
if scan list changes are saved. If “On” is selected, changes are saved as
they are made and the scan list is the same when power is turned on. If

35

SYSTEM AND GROUP SCAN

“Off” is selected, they are no longer saved. Therefore, to store a list,
select “On”, program the list, then select “Off”. Then when power is
turned on, the scan list returns to the state that existed when “Off” was
selected.

If the menu SCN SAVE para meter is not selecta ble, the sc an list sa ve
mode is fixed by programming. If “On” is programmed, all changes are
saved and no change occurs in the scan lists when power is cycled. If
“Off” is programmed, they are not saved and the scan list reverts to the
default status when power is cycled.

Scan Delay and Continue Timers

When a message is recei ved or transmit ted whil e scann ing, the re is a
short delay before scanning resumes. The delay after receiving a call
prevents another message from being received before a response can be
made. Likewise, t he de lay after transmit ti ng a call ensur es that you hear a
response to your cal l ins te ad of another message occur ri ng on some other
system or group. Note that scanning does not resume if it has been
disabled, such as by taking the microphone off-hook.

There is also a scan continue timer that may be programmed. This
timer contro ls the maximum time that a c all is received before scanning
resumes. Times up to 60 seconds can be programmed. This prevents
scanning from being delayed for long periods by lengthy calls. If the
menu SCN CONT parameter is selectable (see page 32), this feature can
be turned on and off.

Transmitting In The Scan Mode

General

When a message is received in the scan mode, programming deter­mines if the selected system/group does not change or changes perma­nently or temporarily to that of the call. This then affects the system/
group on which a response to the message occurs and also the system/
group that is selected when the scan mode is exited by pressing the
SCAN switch. The three programmable configurations are as follows:

36

SYSTEM AND GROUP SCAN

Last Selected - The selected system/group does not change when calls
are received on other system/groups. Therefore, to respond to a message
not on the selected system/group, one of the following methods must be
used. With this configuration, the display may not indicate the system/
group on which the response occurs.

• Select the system/group of the call manually using the Select switch.

• Before scanning resumes, exit the scan mode by pressing the SCAN

switch. The syst em/group o f the cal l then b ecomes the selected system/
group and it is not necessary to change it manually.

Last Received - The selected system/group changes to the system/group
of a call. Therefore, you can always respond to a call without having to
manually change the system/group. To return to the previously selected
system/group, manually select it using the Select switch.

Temporary Last Received - The system/group changes to the system/
group of a call for only the duration of the scan delay period (see
page 36.) Then when the delay expires and scanning resumes (if it is not
disabled), the selected system/group is again displayed. Therefore, you
can respond to a call without changing the selected system/group as long
as you do so before scanning resumes.

Fixed System/Group Transmit in Scan

Each bank can be programmed so that transmissions made in the
scan mode while scanning is occurring are on a preprogrammed system/
group. Note that scanning must be occurring (scrolling underline
displayed) when the transmitter is keyed. Since taking the microphone
off-hook normally disables scanning (unless off-hook detection is
disabled), the transmitter usually must be keyed with the microphone on­hook.

If a transmission occurs under these conditions, the selected system/
group also changes. If the transmitter is keyed with scanning halted, the
programming described in the preceding section takes precedence.

37

LTR AND CONVENTIONAL MODES

LTR AND CONVENTIONAL MODES

General

Each selectable s y st em ca n be p rog rammed for LTR or conventional
operation by your s ystem oper ator. The type or types of operation th at are
programmed in your transceiver are determined by the type of radio
equipment being used in your radio system. The differences in operation
are described in the following information and elsewhere in this manual
as required.

LTR Operation

The LTR mode provides automatic channel selection (trunking) and
monitoring before transmitting. In addition, special tones and display
messages indicate busy and out-of-range conditions. Selecting a system
selects a collect ion of grou ps and other inf o r mati on suc h as fi xed priority
receive ID codes . Select ing a group se lects a t ransmit and receiv e ID code
and other information which controls the mobile or mobiles being called
and what calls are received. LTR features are described starting on
page 40.

Conventional Operation

In the conventional mode, selecting a system selects a collection of
channels and other information unique to those channels. Selecting a
group selects the specific channel and also squelch coding (if any) used
on that channel. Conventional features are described starting on page 44.

There are no tones or messages to indicate busy or out-of-range
conditions in this mode. A busy channel (group) is detected manually or
automatically as described in the following information. An out-of-range
condition cannot be detected automatically but may exist if you cannot

get a response to any of your messa ges . Refer to “Ope rat i on At Exte nded
Range” on page 54 for more information.

38

LTR AND CONVENTIONAL MODES

To properly receive calls in the conventional mode, the squelch
control must be set as described in page 18. If this control is not set prop­erly, weak messages could be missed or noise could be heard when no
message is present. In the LTR mode, the squelch level is fixed and
setting this control has no affect.

Monitoring Con ventional Channels Before Transmitting

Regulations require that the channel be monitored before transmit­ting to make s ure t hat it is not being us ed by someone else. If you were to
transmit when someone else is talking, you would probably disrupt their
conversation. As previously stated, monitoring is performed automati­cally in the LTR mode. In the conventional mode, it must be performed
automatically or manually as follows.

Automatic Ch annel Monitoring

If the selected group is programmed for the Transmit Disable On
Busy feature, monit oring is p erformed aut omatical ly. Refer to page 44 for
more information on this feature.

Manual Channel Monitoring

If the Transmit Disable On Busy feature is not used, monitoring
must be performed manually as follows:

Busy Indicator - With scanning disabled and the squelch control
adjusted as described on page 18, note if the indicator on the front panel
is green. If it is, a signal has been detected on the selected system
(channel) and you should not transmit a message until it turns off.

Monitor Mode - T here may be ti mes when th e busy indica tion is on eve n
though no one is using th e channel . Monitor ing shoul d then be per formed
using the monitor mode. This mode is enabled by taking the microphone
off-hook (unless off-hook detection has been disabled by programming).
The monitor mode temporarily disables Call Guard squelch (see descrip­tion on page 46) and scanning so that all messages on the channel are
heard. The monitor mode is indi cated by in the display as shown in t he

39

LTR FEATURES

following illustration. The monitor mode can also be enabled by the MON
or CG option switch if it is programmed. Refer to the monitor mode
description on page 44 for more information.

Monitor Mode

Selected

LTR FEATURES

Standard and Telephone Calls

Standard calls are between two mobiles or between a mobile and a
control station. Telephone calls allow you to place and receive calls over
the public telephone system using your transceiver. Standard calls are
described starting on page 19, and telephone calls are described starting
on page 21.

Calls on Priority and Block ID Codes

Two fixed priority and a block of receive ID codes can be
programmed. These codes are in addition to the receive and transmit ID
code selected by the group sele ct funct i on. Call s on the fixed priority and
block ID codes are received regardless of which group is selected or
group scanning. All that is required is that the system programmed with
those codes be selected or scanned.

Calls on the fixed priority ID codes have a higher priority than calls
being received on other ID codes. If a call with a higher priority is
detected while receiving a call, the current call is immediately dropped
and the higher priority call received. Telephone calls are not interrupted
by priority calls.

40

LTR FEATURE S

If a call is received on one of the fixed priority ID codes, either

“PRIORTY1” or “PRIORTY2” is displayed on the bottom line. The
selectable groups are the n checke d to see i f any have the same I D code. If
a match is found, the transceiver changes to that group. If no match is
found, the group does not change and a response cannot be made on that
ID code. The “Transmitting in the Scan Mode” programming described
on page 36 determines if a change is temporary or permanent.

When block ID codes are use d, cal ls are dete ct ed on entire blocks of
ID codes. When a call is received on a block ID code, “BLK CALL” is
displayed and the selected group does not change.

Transmit Inhibit

The Transmit Inhibit feature prevents the transmitter from keying if
the mobile you are calling is busy wit h a nother call. When t he tr ansmitter
is disabled by this feature, the intercept tone sounds and “TX INHIB” is
displayed (see following illustration). To make another call attempt, the
PTT switch must be released and pressed again. However, you may want
to wait a few seco nds b efore ma kin g anothe r att empt s o th at the other c al l
can finish.

One use of this feature is to prevent the accidental interruption of a
call in progress. This could happen when the other party unkeys or if a
higher priority ID is transmitted. It may also be used to provide an indica­tion that the mobile you are calling is busy with another call. A similar
Transmit Disable On Busy feature is available on conventional systems
(see page 44).

41

LTR FEATURES

Busy Queuing

The LTR busy queuing feature places a telephone call in a queue if
the radio system is busy when it is placed. Then when the system
becomes available, the call is automatically placed. Standard (mobile-to­mobile) calls are not queued by this feature. If queuing is programmed
and a busy condition is encountered, the queue mode is entered automati­cally when the PTT switch is released. The queue mode is indicated by

“IN QUEUE” on the bottom line of the display (see following
illustration).

When the radio system becomes available, it is automatically
accessed. A beep then sounds and a dial tone is heard. The call can then
be placed if desired. The queue mode is exited before the call is placed if
any of the following occur (exit is indicated when “IN QUEUE” is no
longer displayed).

• The PTT switch is pressed

• Any call is received

• Any front panel option switch is pressed

• Power is tu rned off

Calls are received normally in the queue mode. However, receiving
any call causes the mo de t o be e xit ed as indicated above . Grou p sca nni ng
remains enabled while in the queue mode, but system scanning is tempo­rarily disabled. This feature is enabled on individual LTR systems by
dealer programming and is then available with all telephone calls on
those systems.

System Search

If an out-of-range condition exists when attempting an LTR tele­phone call, the system search feature can be used to automatically search

42

LTR FEATURE S

for a system within range. If enabled, the system search mode is automat­ically entered when the PTT switch is released. This mode is indic ated b y

a short tone and “SYS SRCH” o n the bottom line of th e di spl ay a s shown
in the following illustration.

The transceiver then at tempts to ac cess, in suc cessi on, other sys tems
that have a group programmed for telephone calls. As each system is
accessed, a beep sounds. If a system is successfully accessed, the new
system/group is selected and a dial tone sounds. The telephone call must
then be placed within a few seconds or normal operation resumes. If no
system could be accessed, the intercept tone sounds, “NO PHONE” is
displayed, the system/group does not change, and the feature deactivates.

This mode can also be canceled at any time by pressing any front
panel option switch. If the menu mode SYS SRCH parameter is select­able (see page 30), this feature can be turned on and off. Otherwise, it is
either enabled or disabled on all LTR systems by programming.

Transpond

The transpond feature indicates if the mobile being called is in
service. To be available, it must b e prog rammed in the t ransc eiver you a re
calling. Each sele ctabl e LTR group can be progr ammed for thi s fea ture. If
a call is received on one of these groups, the transceiver automatically
transmits a response. This causes the transceiver placing the call to
briefly un squelch and the call indicator to turn on (if it is programmed on
the selected group).

43

CONVENTIONAL FEATURES

CONVENTIONAL FEATURES

Monitor Mode

The monitor mode is used to monitor a channel before transmitting.
When this mode is select ed, it temporari ly dis ables Call Guar d squel ch or
other squelch control techniques and also scanning so that all messages
occurring on the selec ted grou p (channe l) are hear d. The monitor mode is
enabled by taking the microphone off-hook (unless off-hook detection is
disabled by programming) or pressing the MON option switch. The
monitor mode is indicated by in the display.

A conventional system must be selected to enable monitoring. If the
microphone is taken off-hook with an LTR system selected, scanning
halts (unless off-hook detection is disabled) but monitoring is not
selected. The MON option switch is not detected when scanning is
enabled, and if it is pressed with an LTR system selected, NOT CONV is
displayed and monitoring is not selected. This switch must be pressed
again to disable the monitor mode.

A CG (Call Guard disable) option switch may also be programmed.
This switch disables both receive and transmit squelch control on the
selected group (the monitor mode disables only receive squelch control).

When squelch control is disabled by the CG switch, “CG OFF” is
momentarily displayed. To re-enable squelch control, press the CG
switch again, (“CG ON” is displayed), select another system/group, or
cycle transceiver power.

If the Transmit Disable On Busy feature is used (see description
which follows), monitoring is performed automa tically and the monitor
mode may not need to be used. Refer to “Monitoring Conventional Chan­nels Before Transmitting” on page 39 for more information.

Transmit Disable On Busy

The Transmit Disable On Busy feature automatically disables the
transmitter if the select ed group (ch annel) is busy when the PTT s wit ch is

44

CONVENTIONAL FEATURES

pressed. When the transmitter is disabled by this feature, the busy tone

sounds briefly and “DSBL BSY” is indicated on the lower line of the
display. The monitor mode (see preceding section) is enabled while the
PTT switch is pressed so that activity on the channel can be monitored.
However, it is not possible to access a channel by holding down the PTT
switch (it must be released to make another attempt).

Occasionally, a busy condition may be detected even though no one
is talking. To key the transmitter in this case, release the PTT switch and
then immediately press it again. There is also a programmable option
with this feature to allow transmitting with a busy channel if the correct
Call Guard signal is detected. The Transmit Disable On Busy feature is
enabled or disabled on each conventional group by dealer programming.

Talk-Around

Normally, all transmissions go through a repeater. Therefore, if you
are out of radio range of the repeater, you cannot talk to anyone, even if
you are only a short distance away from the mobile you are calling. To
allow communication if this occurs, the talk-around feature can be used
to enable direct mobile-to-mobile communication without going through
a repeater.

Each selectable group can be programmed for talk-around. It is then
automatically selected when the group is selected. There is no special
talk-around indicator although the group alpha tag on the lower line of
the display may be used to indicate this feature.

Ta lk-around can also be selected by the TALKARND menu param­eter (see page 32) or T/A option switch. When talk-around is selected by
this swit ch, “TA ON” is flashed on the lower line of the display. Then
when it is disabled, “TA OFF” is flashed. Changing the selected system
or group, enabling scanning, or turning power off causes talk-around to
revert to the default condition programmed for the selected group.

Conventional systems can be programmed so that talk-around
cannot be selected. If an attempt is then made to enable talk-around with
the switch, “NO TALK” is flashed on the lower line of the display.

45

CONVENTIONAL FEATURES

Groups may also be programmed so that talk-around cannot be turned

off. If the option switch is then pressed, neither “TA OFF” nor “TA ON”
is displayed. If the menu mode is used in these cases, the current mode
cannot be changed.

Call Guard Squelch

The Call Guard squelch feature eliminates distracting messages
intended for others using the channel. This is done by using a subaudible
tone or digital code to control the squelch. This tone or code is unique to
a user or a group on that channel. It is transmitted with the voice signal
but is not heard because it is in the subaudible range and attenuated by a
filter. Call Guard squelch can be programmed on each conventional
group. LTR operation uses ID codes to perform a similar function.

Priority Group Sampling

The priority group sampling feature ensures that messages on
priority conventional groups are not missed while listening to a message
on a non-priority conventional group. A fixed first and second priority
group can be designated by programming or either priority group can be
the selec ted group. When a firs t priority group is selected, is
displayed, and when a second priority group is selected, is displayed
(see following i llustrati on). When scanni ng, this symbol is displa yed only
while a call is being received on the particular priority group.

When a message is detected on a first priority group while listening
to a non-priority message, a tone sounds, “PRIORTY1” is flashed on the
lower line of the dis play, and the transceiver cha nges to that system/gr oup
to receive the message. Likewise, if a message is received on a second
priority group, “PRIORTY2” is displayed. When the priority message is

46

MISCELLANEOUS

complete, the transceiver returns to the previous system/group. If a
message is still present, it is received.

When a priority system/group is sampled while listening to a

message on some other system/group, a series of “ticks” may be heard.
These ticks are brief interruptions of the audio signal that occur when
sampling takes place.

If the menu mode PRIORITY parameter (see page 32) or the PRI
option switch is available, priority sampling can be turned on and off.
When it is enabled by the switch, “PRI ON” is flashed, and if it is
disabled, “PRI OFF” is flashed. If this menu parameter or switch is not
available, priority sampling is either enabled or disabled by program­ming.

NOTE: Priority sampling occurs only on conventional systems and only
when scanning is enabled by the SCAN switch. It does not occur when
listening to an LTR call or when transmitting.

MISCELLANEOUS

Supervisory Tones

The following tones are heard at various times when operating this
transceiver. Some or all of these tones can be disabled by the TONES
menu parameter or programming. Refer to “Tone Select” on page 30 for
more information.

Busy Tone - This tone is similar to the st anda rd te le phon e bu sy to ne, and
it indicates that the radio system is currently busy. It sounds with all LTR
calls, but not conventional calls. Repeated access attempts are made
while the PTT switch is pressed with this tone sounding. Therefore, the
P TT switch doe s not need to be rele ased to access the system. The display
indicates “BUSY” while this tone is sounding.

Intercept Tone - This is a siren-like tone (a lter nating high and l ow tones )
which indicates the following out-of-range and error conditions:

47

MISCELLANEOUS

• Out-Of-Range - If this tone sounds shortly after pressing the PTT

switch and “OUT RNGE” is displayed, the transceiver was unable to
contact a repe ater. The usual cause fo r this is an out-of-rang e condit ion
(see “Operation At Extended Range” on page 54). Once this tone
sounds, no more access attempts are made until the PTT switch is
released and then pressed again. This condition is not indicated with
conventional operation.

• Time-Out Timer - If this tone sounds after the transmitter has been

keyed for an extended period and “TIMEOUT” is displayed, the trans­mitter has b een di sab led by the Time-Out Timer feat ur e ( se e page 29).
This tone sounds with both LTR and conventional operation. Ten
seconds before this tone sounds, a single beep sounds to indicate that
time-out will soon occur.

• Transmit Inhibit - If this tone sounds as soon as the PTT switch is

pressed with an LTR system selecte d and “TX INHIB” is displayed, t he
transmitter has been disabled by the Transmit Inhibit feature (see
page 41).

• Transmit Disable On Busy - If this tone sounds as soon as the push-to-

talk switch is presse d with a conventiona l syste m sele cted and “DSBL
BSY” is displayed, the channel is busy and the transmitter was disabled
by the Transmit Disable On Busy feature (see page 44).

• Receive-Only Channel - If this t one sou nds as s oon as t he push -to-t alk

switch is press ed with a convention al system sele cted and “TX DSBL”
is displayed, the channel is receive-only (see page 29).

• Tx While Receiving Call - If the pu sh-to-talk switch is pressed while

receiving a LTR call, this tone sounds and “DSBL BSY” is displayed.

Proceed (Clear-To- Talk) Tone - This is a short tone which sounds after
the push-to-talk switch is pressed to indicate when talking can begin (see
page 28). A loud (two-pitch) tone may also be programmed.

Key Press Tone - This is a short tone that indicates when an option
switch is pressed (all modes).

48

MISCELLANEOUS

Priority Call T one - This is a short tone that so unds when a call is received
on a conventional first or second priority channel (see page 46).

Wrap-Around Tone - This is a two-pitch tone that indicates that the
highest or lowest channel was displayed and that wrap-around has
occurred.

Error Tone - This is a two-pitc h tone that indi cates that an error condition
has occurred.

LTR Telephone Call Tones

The following tones are generated by LTR interconnect equipment
and are heard whe n making LTR telephone ca lls. Theref ore, if some ot her
type of interconnect equipment is being used, these tones may vary.

Reorder Tone - Three beeps which indicate that the call has been termi­nated by the system.

Return Time Warning Tone - Two beeps which warn that you have not
transmitted for an extended period. If you do not transmit within 5
seconds , the cal l is automaticall y terminated by th e system. The tim e
between transmissions is one of the parameters used by the system to
detect the end of a call when the # character is not sent.

Conversation Time-Out Tone - Calls are limited to a certain length by

the system. Thirty seconds before this time is reached, a “tick” begins
sounding each second. When the 30-second time expires, the call is auto­matically terminated by t he system.

Turn-Around Tone - This is a single beep which may be used to indicate
to the landside party when to respond to your transmission. It sounds
when you release the PTT switch, and you may partially hear this tone.

Proceed Tone - This tone consists of two beeps and it tells the landside
caller when to enter the five-digit number specifying the mobile bein g
called. Dialing of thi s number must be st arted withi n 5 s econds of he aring
this tone, and a tone-type telephone must be used.

49

MISCELLANEOUS

Display Messages

The following messages appear on the upper or lower line of the
display to indicate various operating modes and error conditions. The
group alpha tag appears in this area during normal operation.

BLK CALL - Indicates that the call is being received on an LTR block

ID code (see “Calls on Priority and Block ID Codes” on page 40).
BUSY - Indicates that the LTR radio system is currently busy (see “Busy

Tone” on page 47).
CG ON or OFF - Indicates that Call Guard squelch was just enabled or

disabled by the CG option switch (see “Monitor Mode” on page 44).

DSBL BSY - Indicates that the transmitter is disabled by the conven­tional Transmit Disable On Busy feature (see page 44). It also indicates
that the transmitter was keyed while receiving an LTR call.

EMERGNCY - Indicates that the emergency switch has been pressed
(see “Emergency Switch” on page 24).

FCN - Indicates that the function select mode is selected by the FCN
option switch (see page 25).

GSCN DIS - Indicates that an attempt was made to delete a group from
the scan list with group scanning disabled (see “Scan List Programming”
on page 35).

IN QUEUE - Indicates that the call has bee n pla ced in queue by the LTR
Busy Queuing feature (see “Busy Queuing” on page 42).

Model - The last seven digits of the trans ceiver par t number are indica ted
very briefly on the top line of the display when transceiver power is
turned on. This number indicates such things as frequency band, power
output, and tier of the transcei ver. The eighth digit is r es erv ed a nd a lways
“0”.

50

MISCELLANEOUS

NO DT GP - Indicates that no valid data group could be found for a data
transmission.

NO POWER - Indicates that the transmitter temperature or supply
voltage is excessive and that the transmitter has been automatically shut
down. Release the PTT switch and allow the transmitter to cool. If the
problem persists, contact your system operator for service.

NO PHONE - Indicates that the LTR system search mode could not
locate any systems programmed for telephone calls (see page 42).

NO TALK - Indicates that talk-around has been disabled on the selected

conventional system by programming (see “Talk-Around” on page 45).
NOT CONV - Indicates that an attempt was made to enable a conven-

tional mode feature on an LTR system.
OUT-LOCK - Indicates that the synthesizer is unlocked. Refer to

“Transceiver Service” on page 55 for more information .

OUT-RNGE - Indicates that the transceiver was unable to contact a
repeater. Once this indication appears, no more access attempts are made
until the PTT switch is released and then pressed again. Refer to “Opera­tion At Extended Range” on page 54 for more information.

PRI ON or OFF - Indicates that priority sampling was just enabled or
disabled by the PRI option switch (see page 46).

PRIORTY1 or 2 - Indicates that an LTR or conventional call is being
received on one of the priority ID codes or groups (see pages 40 and 46).

PROG ERR - Indicates an EEPROM read error. Refer to “Transceiver
Service” on page 55 for more information.

SQUELCH - Indicates that the conventional squelch adjust mode is
selected (see “Setting Squelch Control” on page 18).

SYS SRCH - Indicates that the LTR System Search mode has been
enabled (see page 42).

51

MISCELLANEOUS

TA ON or OFF - Indicates that talk-around was just enabled or disabled

by the TA option switch (see “Talk-Around” on page 45).

TIMEOUT - Indicates that the transmitter has been disabled by the
Time-Out Timer (see page 29).

TX DSBL - Indicates that the selected conventional system is
programmed for monitoring only (see “Receive-Only Groups” on
page 29).

TX INHIB - Indicates that the transmitter has been disabled by the
Transmit Inhibit feature (see page 41).

Menu Mode Messages

The following messages are displayed in the menu mode that is
described starting on page 30. “ON” is displayed to indicate enabled or
yes, and “OFF” is displayed to indicate disabled or no.

BCKLHGT - Backlight control

• BRIGHT

• DIM

• OFF

BANK SEL - Bank select

• Bank alpha tag

ENCRYPT - Encryption on-off

• ON or OFF

HRN ALRT - Horn alert on-off

• ON or OFF

OPTION - Option on-off

• ON or OFF

PRIORITY - Conventional priority group sampling

• ON or OFF

SCN CONT - Scan continue on-off

• ON or OFF

SCN SAVE - Scan list save

• ON = save, OFF = not saved

52

MISCELLANEOUS

SCN TYPE - Selects type of scanning

• SYS-GRP - Both system and group

• GRP ONLY - Group scanning only

• OFF - All scanning disabled

S/G DISPL - System/group display mode

• ALPHATAG

• NUMERIC

STEALTH - Stealth mode select

• ON or OFF

SYS SRCH - LTR system search

• ON or OFF

TALKARND - Conve nt ion al tal k-around on-off

• ON or OFF

TONES - Beep tones select

• SILENT - All tones disabled

• KEY BEEP - Only Select switch and key press tones sound

• ALERT - All tones sound except preceding Key Beeps sound

• ALL TONE - All the preceding tones sound

System Operator Programming

As noted several times in this manual, programming determines the
availability and specific operation of many features. This refers to the
programming performed by your system operator when the radio was set
up, not to any programming that you can perform. If a feature is not
controlled by a front panel option switch, it is fixed in the mode set by
programming or not available. If you require additional information on
the operation of a feature, contact your system operator.

Speaking Into Microphone

For best results, hold the microphone about 1-2 inches from your
mouth and speak at a normal conversational level. Do not shout since it
distorts your voice and does not increase range. Make sure that the PTT
(push-to-talk) s wit ch is pressed bef ore you begin to spea k a nd rel ea sed as
soon as the message is co mple te. If the proceed tone is us ed, wai t fo r th at
tone to sound before speaking (see description on page 28).

53

MISCELLANEOUS

Operation At Extended Range

When approaching the limits of radio range, the other party may not
be able to hear your transmissions and there may be an increase in back­ground noise when messages are received. You may still be out of range
even though you ca n hear a message. The r eas on f or this is that t he si gnal
you are receiving is usually transmitted at a higher power level than the
one transmitte d by your trans ceiver. Communication may be improved by
moving to higher ground or away from shielding objects such as tall
buildings or hills.

Preventing Battery Discharge

In the standby mode (power on, not transmitting), transceiver power
consumption is relatively low. Therefore, you can probably leave the
transceiver on for one or two days without operating the vehicle and the
battery should not become seriously discharged. However, if the outdoor
temperature is low enough to significantly decrease battery capacity, the
transceiver should be turned off when not in use.

Since power consumption is significantly higher when transmitting,
it is good practice to have the vehicle running while transmitting. This
ensures that optimum po wer is being delivered to the trans cei ver and th at
the battery does not become discharged.

Licensing

A government license is usually required to operate this transceiver
on the air. Your system operator will normally handle the licensing
requirements.

54

MISCELLANEOUS

Transceiver Service

If your transceiver is not operating properly, “OUT-LOCK” or
“PROG ERR” may be displayed. To attempt to clear this condition, t urn
power off and then on again to reset the control logic. Another indication
that could be displayed is “NO POWER”. This indicates that transmitter
temperature or supply voltage may be excessive. Release the PTT switch
and allow the transceiver to cool, and make sure that the vehicle battery
voltage is within the normal range.

Also make sure that the controls are properly set and that the power,
external speaker (if used), and accessory (if used), cables are securely
plugged into the back of the transceiver. If the transceiver is completely
inoperative, check the power cable fuse. If it is blown, remedy the cause
if possible and replace it with the same type (15A). If the transceiver still
does not operate properly, return it to your system operator for service.

NOTE: There are no user-serviceable components in the transceiver.
Altering internal adjustments can cause illegal emissions, void the
warranty, and result in improper operation that can seriously da mage the
transceiver.

55

Part Number 002-9803-201
11-99hph Printed in U.S.A