Maxon TM-4800 Instructions Manual

Operating Instructions

TM-4800 Mobile

800 MHz Transceiver

About Your TM-4800 Radio

Maxon's TM-4800 is a sophisticated microprocessor­controlled transceiver which operates in the 800 MHz range.
Operation and functions for Maxon's TM-4800 radio are
described in this manual.

We urge you to thoroughly read this manual before
operating the radio.

The TM-4800 has been designed for ease of operation.
Many of the functions described in this manual are
dependent on the system in use. Your Maxon Dealer has
programmed the TM-4800 radio to optimize your
requirements.

Should you have any questions regarding the operation of
the radio, please consult your Maxon Dealer.

About Maxon America, Inc.

Maxon America, Inc. designs and manufactures professional
FM two-way radio equipment to serve a wide variety of
communication needs. Maxon produces equipment for the
Land Mobile Radio and Specialized Mobile Radio markets
(business, industrial, government and public safety).

Table of Contents

SECTION I - Model TM-4800 Radio

Safety Information 1
Unpacking Information 2
Installation Safeguards 3
TM-4800 Features 4
Quick Reference Guide 5
Description of Radio Components 6

Controls and Connectors 6
Function Keys 8
Display Information 9

TM-4800 Operation 10

Trunking and Conventional Mode 10
Channel Monitoring 10
System "Handshaking" 10
Transmitting 11
Receiving 12
T/A - Talk-Around 12
Transpond Mode 13

Scan Modes 14

General 14
System Scan 14
System Lockout 14
Group Scan 15
Auto Group Scan 15
Manual Group Scan 16
Transmitting While Scanning 16
Last Active (Floating) System and Group 16
"Home" System and Group 17
Scan Resume Delay 17
RX Priority 18
First Available System Scan 18

Trunking Supervisory Tones 19

Busy Tone 19
Intercept Tone 19

Clear-To-Talk 20
Key Press Tone 20

Display Messages 20
Transceiver Service 21
Extended Operations 22
FCC Licensing 23
TM-4800 Product Warranty 24

SECTION II - Model TMA-4474

About Your TMA-4474 Optional Microphone 27
Quick Reference Guide 28
Function Keys 30
Scan Modes 33

Manual System Scan 33
Manual Group Scan 33
Transmitting While Scanning 34
First Available System Scan 34

Telephone Calls 35

Placing a Telephone Call 35
Receiving a Telephone Call 37

Additional Telephone Calling Information 38

Entering Telephone Numbers 38
Clearing Telephone Numbers 39
To Store a Number in Memory 39
To Recall a Number Stored in Memory 39

Trunking Supervisory Tones 40

Busy Tone 40
Intercept Tone 40
Clear-To-Talk 41
Key Press Tone 41
Reorder Tone 41
Return Time Warning Tone 41
Conversation Time-Out Tone 42
Turn-Around Tone 42
System Ringback Tone 42

TMA-4474 Product Warranty 43

1

Safety Information

The Federal Communications Commission (FCC), with
its action in General Docket 79-144, March 13, 1985, has
adopted a safety standard for the human exposure to Radio
Frequency (RF) electromagnetic energy emitted by FCC
regulated equipment. Proper operation of this radio will
result in user exposure far below the Occupational Safety
and Health Act and Federal Communication Commission
limits.

DO NOT operate a mobile radio when someone outside the
vehicle is within two feet (0.6 meter) of the antenna.

DO NOT operate the radio near unshielded electrical
blasting caps or in an explosive atmosphere, unless it
is a type specifically designed and qualified for such use.

DO NOT operate the transmitter of any radio unless all RF
connectors are secure and any open connectors are properly
terminated.

DO NOT allow children to operate transmitter-equipped
radio equipment.

• For safe operation, all equipment must be properly
grounded.

• All equipment should be serviced only by a qualified

technician.

This device complies with Part 15 of the FCC rules.
Operation is subject to the condition that this device
does not cause harmful interference.

Unpacking Information

Remove and carefully inspect the contents of your package
for the following items:

• Radio

• Microphone

• DC power supply cord

• Mounting bracket, hardware

• Microphone hanger and hardware

• Operating instructions

If any items are missing, please contact your Maxon
Dealer.

2

Installation Safeguards

Some electronic fuel injection, anti-skid breaking systems,
cruise controls, and vehicle alarms may be prone to interfer­ence from radio frequency energy or may malfunction due to
a lack of protection from RF energy. If the vehicle contains
such equipment, consult the dealer or factory and enlist their
help in determining whether the electronics equipment in the
vehicle will operate properly when the radio is transmitting.

• Select a location for the radio which allows the user to see
and easily reach the microphone and radio controls.

DO NOT install the unit where it would interfere with the
proper operation of automatic collision protection
devices (air bags).

DO NOT install the unit where it would likely cause injury
in case of accident.

• After selecting a location for the radio, hold the mounting
bracket in place. Using the bracket as a template, mark
with a pencil the spots where the bracket securing
screws will be located.

• Before drilling holes in the vehicle, verify that there is
nothing that could be damaged or get in the way by
drilling and putting screws in this location.

NOTE: It is better to use existing passages in the dash­board, trunk, and floor for the routing cable, thus avoiding
excessive drilling.

NOTE: This radio is not intended for operation in a positive
ground vehicle.

A suitable antenna must be purchased for use with the radio.
Consult your Maxon Dealer for recommended Maxon
antennas.

3

4

TM-4800 Features

• Up to 10 systems selectable

• Up to 10 groups selectable per system

• System scan

• System lockout when scanning

• Group scan automatically or manually

• Programmable CTCSS and DCS squelch capability

• 7-character alpha-numeric LCD display with backlight

• Operation in both trunking and conventional modes

• Repeater talk-around (conventional and trunking modes)

• Automatic system ringback if system is busy

• Transmit inhibit with busy tone

• Clear-to-talk tone

• First available system scan (FASS)

• Optional microphone for telephone interconnect*

• Storage of up to 8 telephone numbers (of up to 14 digits in
length) *

*Functions only when using Maxon Model TMA-4474
(optional microphone with DTMF keypad).

NOTE: System setup determines the specific operation
of some of the above features. Refer to the descriptions
in this manual for more information.

V

5

• OFF

VOL

• MAX

V

GRP

LCK

T/A

SCN

V

SYS

V

Quick Reference Guide

Controls

Push-To-Talk bar (on microphone) places

transceiver in transmit mode

Turns transceiver On/Off and
adjusts VOLume

Changes SYStem number

LoCKs displayed System out of
scan sequence

Talk-Around bypasses system when out
of range of system

Initiates SCaNning mode

Changes GRouP number

Description of Radio Components

Controls and Connectors

TX/RX Indicator - Two color LED glows red when radio

is transmitting (TX) and green when radio is receiving (RX).

On/Off-Volume Control - Turning this knob clockwise
supplies power to the radio and increases volume level. A
counter-clockwise rotation decreases volume level. To turn
transceiver power off, rotate knob counter-clockwise
to detent.

Microphone Connector - Eight pin modular connector for
Maxon heavy duty microphone and optional DTMF micro­phone (model TMA-4474).

Function Keys - Used to select system and group; to
initiate system lockout, talk-around and scan modes.

6

Controls and Connectors, Continued

Antenna Connector - N-type connector. Must be

connected to a properly installed 50 ohm antenna.

Power Connector - Polarized plug for 13.8 VDC
NEGATIVE GROUND SYSTEMS ONLY.

Auxiliary Speaker Connector - A 3.5mm diameter
jack is provided for a 4 ohm auxiliary speaker.

7

Function Keys

SYS "System" Selector Keys - Pressing ▲ or ▼ selects the

next programmed system. Only programmed systems will be
displayed. System number selected is located on the left side
of display.

LCK "Lock" Key - Used to lock system or systems out of
the scan sequence so that they are not scanned. This function
is retained in memory and does not need to be re-entered
each time the radio is turned on. (Refer to "System Lockout"
for more information).

T/A "Talk-Around" Key - Places the TM-4800 into the
talk-around mode on trunking and conventional systems
(Dealer programmable option). Allows direct radio-to-radio
communication when out of range of the system.

SCN "Scan" Key - Pressing this key initiates the scan
feature. When the SCN key is pressed followed by pressing
either the SYS (system) or GRP (group) key, system scan or
group scan is enabled. (See "Scan Modes" for more
information).

GRP "Group" Selector Key - Pressing

▲ or ▼ changes the

selected group. Only programmed groups will be displayed.
Group number selected is located on the right side of display.
Group name or identifier is shown in main body of display.

8

SYS GRP

▼

SCN

LCK

T/A

▲

▲

▼

Display Information
Alpha-numeric Display - In the normal mode the

7-character display identifies a selected system/group
and those operating modes or error conditions as
described in "Display Messages".

SYS (System) -Displays above the system number
LOCK -Indicates that the displayed system has

been locked out of the scan sequence
or a system or systems have been locked
out of scan

FASS -Indicates First Available System Scan

has been enabled

PHONE -Indicates that the telephone mode has been

selected*

-Indicates that the displayed group is
programmed for telephone interconnect

GRP (Group) -Displays above the group number

-Indicates that there are overflow digits (the

telephone number is longer than 7-digits)*

SCAN -Indicates that the scan mode has been

initiated

CALL -Indicates that a call has been received
BUSY -Indicates that the channel (conventional)

or the system/group (trunking) you have
selected is busy

* Displays only when using optional Maxon TMA-4474 micro­phone with DTMF keypad.

9

TM-4800 Operation

Trunking and Conventional Mode

Your Maxon TM-4800 may be programmed to operate in
both trunking and conventional modes. Each system can be
individually programmed to operate in either trunking or
conventional systems. There are only a few differences in
their operation and these are detailed as follows.

Channel Monitoring

While on a trunking system, channel monitoring is
performed automatically by the radio. In accordance with
the FCC Rules, while operating on a conventional system
the channel must be monitored prior to transmitting. Simply
remove the microphone from the hanger bracket to monitor.
In both trunking and conventional systems, operation may
vary from system to system. Your Maxon Dealer will be
able to assist with particular operational parameters and
procedures.

System "Handshaking"

In a trunking system, when the P-T-T bar on microphone is
pressed, the red TX/RX indicator flashes momentarily to
allow the transceiver and system repeater to connect properly.
When the red TX/RX indicator glows steadily, voice
transmission may begin. If your Maxon Dealer has enabled
the clear-to-talk tone option, the radio will emit a short tone
signal, then voice transmission may occur. In conventional
systems, there is no system "handshaking" and voice
transmission may start immediately.

10

Transmitting

A. Turn power on and rotate control clockwise to desired

volume level.

B. Press the SYS and GRP keys until the desired system

and group are displayed.

C. If a conventional system is selected, the channel must be

monitored before transmitting.

D. Press and hold the P-T-T bar on the side of the

microphone. Listen for the clear-to-talk tone (or
wait for the TX/RX indicator to glow steady red).
Hold the microphone 1 or 2 inches from your
mouth, speaking clearly and distinctly. (If a busy,
or intercept tone is heard, refer to "Trunking
Supervisory Tones" descriptions for more
information).

E. Release the P-T-T bar on the microphone as soon as the

message is complete and listen for a response.
The P-T-T bar must be released to listen.

11

12

Receiving

A. Turn power on and rotate control clockwise to desired

volume level.

B. Press the SYS and GRP keys until the desired system

and group are displayed.

C. When a message is received, the TX/RX indicator will

glow steady green.

D. To respond press and hold the P-T-T bar on the side of

the microphone. Listen for the clear-to-talk tone
(or wait for the TX/RX indicator to glow steady
red). Hold the microphone 1 or 2 inches from your
mouth, speaking clearly and distinctly. (If a busy,
or intercept tone is heard, refer to "Trunking
Supervisory Tones" descriptions for more
information).

NOTE: If scanning, be sure to respond before scanning
resumes. If you do not, another call may be received and the
selected system and group may have to be changed. Refer to
system scan description for more information.

T/A - Talk-Around

Talk-around mode, if enabled by your Maxon Dealer, allows
you to talk directly from radio to radio. This is useful when
your radios are out of range of any system. If the radio can
receive the system transmissions, then talk-around may be
disabled.

A. Press the T/A key. The LCD display will indicate the

word SIMPLEX in place of the unique system /
group identifier.

B. Transmit and receive as described in "Transmitting".

C. To return to trunking or conventional operation press the

T/A key again.

Transpond Mode

If transpond has been enabled by your Dealer, your radio
will automatically send (transpond) an acknowledgment to
the system indicating that your radio has received a transmis­sion. Transpond is a Dealer programmable option.

13

Scan Modes

General

Both system scan and group scan are available in Maxon's
TM-4800 radio. Although your Maxon Dealer will explain
which option(s) he has programmed for you, the following is
a description of each.

System Scan

System scan is initiated by pressing SCN, then SYS. Scan
mode is indicated by the word "SCAN" displayed in the
upper center portion of the display. When scanning is
actually occurring, the words "IN SCAN" appear in the
display in place of the unique group identifier. In addition,
the system numbers are incremented. Scanning is sequential
through all trunking and conventional systems, unless they
are locked out of scan as described under "System Lockout".
When an incoming call is detected, scanning stops and the
call is received. The display will indicate the system and
group identifier from which the call was received and the
word "SCAN" in the upper center portion of the display.
When the incoming call is complete, scanning resumes after
a predetermined pause. To exit scan mode, press SCN and
hold for 2 seconds. (See "Scan Resume Delay" for
additional information regarding the pause).

System Lockout

All trunking and conventional systems are scanned in system
scan mode. If you desire not to scan a particular system,
select that system with the SYS key and press the LCK key.
The word "LOCK" appears in the upper left portion of the

14

display and that system will be deleted from the scan list.
When system scan is initiated, the word "LOCK" will be
shown in the upper left portion of the display along with the

words "IN SCAN" denoting a system or systems have been

locked out of scan. To restore a system to the scan list
manually select the "LOCKed" system and press the LCK
key. The word "LOCK" will disappear and the system
will now be scanned while in the system scan mode. The
"LOCK" information is stored in memory and will not be

affected by turning the power switch off.

Group Scan

There are two different ways the TM-4800 does group
scanning. Your Maxon Dealer programs these functions into
the radio during initial setup. Only those groups your Dealer
has enabled for group scan can be scanned. Group scan is
not available in conventional systems.

Auto Group Scan

There is no action required to initiate auto group scan.
Whenever a system is selected that is programmed for auto
group scan, those groups enabled will automatically be
scanned. When an incoming call on any enabled group is
detected, the radio will switch to this group, display the
group number, and unique identifier. The radio will continue
to display this group until a message comes from another
enabled group; the SYS key is pressed; or the GRP key is
pressed.

15

Manual Group Scan

To initiate manual group scan press SCN, then GRP.
Scan mode is indicated by the word "SCAN" shown in
the upper center portion of the display. When group scan is
actually occurring, the words "IN SCAN" appear in the
display in place of the unique group identifier. Group scan
occurs only on those groups enabled by your Maxon
Dealer for the selected system. When an incoming call is
detected, scanning stops and the incoming call is received.
The display changes to indicate the group identifier on
which the call was received and the word "SCAN" in the
upper center portion of the display remains. When the
incoming call is complete, after a brief pause, scanning
resumes. To exit group scan mode, press SCN and hold
for 2 seconds. (See "Scan Resume Delay" for additional
information regarding the pause).

Transmitting While Scanning

When a message is transmitted while scanning (i.e., the
words "IN SCAN" show on the display), Dealer
programming determines if it is transmitted on the "Last
Active" (floating) or on a pre-set "Home" system and group.
The following describes operation for each configuration.

Last Active (Floating) System and Group

During scan (i.e., the words "IN SCAN" show on the
display) when you press the P-T-T bar on the microphone,
you will transmit on the system and group that were selected
prior to entering scan mode. Once a signal is received, you
will always transmit on that last system group received.
Last active (floating) programming allows you to respond
(transmit) to an incoming call during scan mode

16

without having to press the SYS or GRP keys or leaving the
scan mode.

"Home" System and Group

The "Home" system and group are the system and group in
which you require priority to transmit on. This is usually the
system and group on which you will receive and transmit
most of your calls.

When you press the P-T-T bar on the microphone during
scanning (i.e. "IN SCAN" appears in the display) your
TM-4800 radio will

always transmit on the "Home" system
and group. This applies whether scanning has stopped for an
incoming call or not.

Scan Resume Delay

After a message is received or transmitted in the scan mode,
there is a delay period of 1-7 seconds before scanning
resumes. The exact length of this delay is programmed by
your Dealer. When a message is received, this delay allows
you to respond without having to change the selected system
and group. If you do not respond until after scanning
resumes (the words "IN SCAN" reappear in display),
another call may be received and the response may not
occur on the desired system or group.

NOTE: If a "Home" system and group is programmed for
scanning, then the above scan resume delay does not allow
you to respond to the incoming call. Your transmission will
always be on your programmed "Home" system and group.

17

RX Priority

Your Maxon dealer may have programmed a group ID as
an RX PRIORITY (receive priority) ID. Whenever your
radio receives this ID, the LCD will show the words "RX
PRI" in place of the normal alpha-numeric system / group
identifier. "RX PRI" will remain on the display until you
press any button or key on the radio. An RX priority
message takes priority over any other message.

First Available System Scan

When you are out of range of a system when trying to
transmit, first available system scan (FASS) will scan
all systems programmed and look for the first system that
is in range of the radio.

To enter first available system scan (FASS), rotate the
on/off-volume control counter-clockwise to detent,
shutting off power to radio. Press and hold the SCN key on
either the radio or the DTMF microphone while turning the
radio power back on. The word "FASS" will show in the
upper center portion of the radio display. When you attempt
to transmit and the selected system is out of range, the radio
will emit a short tone indicating the system is out of range
and FASS mode has started. When the radio detects a
system in range, scanning will stop and the radio will emit a
short series of tones (auto ringback tones) to indicate a
system is in range. Normal operation may resume. To exit
the scan initiated by FASS mode, press and hold the SCN
key for 2 seconds. To exit FASS mode, turn the radio off
and then back on.

-

18

Trunking Supervisory Tones

Busy Tone

This tone is similar to the standard telephone busy tone and
it indicates that the radio system is currently busy. The tone
sounds for as long as the P-T-T bar on the microphone is
pressed, and the word "BUSY" appears in the upper right
portion of the display while this tone is sounding. If the clear­to-talk tone is programmed, the busy tone does not sound
except when making a telephone call.

Intercept Tone

This is a siren-like tone (alternating high and low tones)
which indicates the following error conditions:

1) If this tone sounds after the transmit indicator flashes
several times and "RANGE" appears in the display, an
out-of-range condition is indicated. To complete a call, you
may need to get closer to your radio system. Once this tone
sounds, no more access attempts are made until the P-T-T
bar on the microphone is released and then pressed again.

2) If this tone sounds after the transmitter has been on for
an extended period and "TX TIME" also appears in the
display, the transmitter has been disabled by the time-out­timer feature.

3) If "TX INHIB" is displayed while this tone is sounding,
the selected system is temporarily being used by priority
groups.

NOTE: The range and busy tones can be stopped by
pressing the SYS, GRP, SCN, or PHONE keys or by
pressing and releasing the P-T-T bar.

19

Clear-To-Talk Tone

When the clear-to-talk feature is programmed, it emits a
short tone which indicates when speaking can begin. (Refer
to "Clear-To-Talk" description for more information).

Key Press Tone

This is a short tone that sounds to indicate when a valid key
is pressed. The volume of the tone can be increased or
decreased by turning the on/off-volume control.

Display Messages

RANGE: This message accompanied by an intercept tone

indicates that the TM-4800 radio is out of range or too far
from system site to provide communications.

BUSY: Indicates that the channel is busy when transmitting.
This message is accompanied by the intercept tone.

TX Time: This message indicates that the transmit time­out-time has been exceeded. This message is accompanied
by the intercept tone.

TX DSBL: Transmit is disabled, allowing only reception
of signals. This message will be displayed and the intercept
tone will sound. (Dealer programmed).

TX INHIB: Indicates that the system selected is temporarily
being used by priority groups. This message is accompanied
by the intercept tone. Try your transmission again in 15 to
30 seconds.

20

UNLOCK: This message indicates that the synthesizer has
become unlocked. If this message should be displayed,
take the radio to your Maxon Dealer for service.

RX PRI: Indicates that a call has been received on a
programmed priority group. (Dealer programmed).

IN SCAN: Indicates that the scan function has been
enabled.

Transceiver Service

There are no user serviceable components inside the
Maxon TM-4800 radio. Altering the internal components
or adjustments may result in illegal emissions, including
off-frequency operation, or damage to the radio.

Should the LCD fail to display information, or all icons and
display segments appear, turn the power switch off, then on
to reset the microprocessor.

If the radio fails to operate properly, refer to an authorized
Maxon Dealer for servicing.

21

Extended Operations

When operating in fringe areas at some distance from
the system, the other party may not receive your transmis­sion clearly. Also you may notice that the background noise
will increase on received signals. Moving to higher ground
or moving closer to the system will help alleviate these
problems. If moving closer to the system is not practical,
communication may be improved by moving away from
shielding structures. At 800 MHz the wave length is very
short; sometimes moving a few inches to a few feet can make
significant signal strength changes. Finding the best location
can also be done while listening to the background noise
while moving about; attempt to find a spot where the
background noise is reduced to a minimum or eliminated
entirely. This may make the difference from not being heard,
to being heard loud and clear when operating in the fringe
areas of your system coverage.

The fringe distance will vary greatly in plains areas, hilly
terrain, and mountaintop sites.

Consult your Maxon Dealer regarding the specific opera­tional range and coverage of the system(s) programmed
into your TM-4800 radio.

22

FCC Licensing

This unit may or may not require a specific FCC license to
operate. The FCC requires all transmitters in the conven­tional and some trunking systems to be licensed by the
Federal Communications Commission. Some trunking
operations now are exempt from individual licensing
requirements, but must be operated in a licensed system.

Consult your Maxon Dealer or contact the Federal
Communications Commission regarding specific licensing
information.

For more information regarding the FCC license application
(Form 574), call the FCC Forms Distribution Center at
717-337-1212 for additional information or contact the
FCC District Office nearest your location.

23

TM-4800 Limited Warranty *

Maxon America, Inc. ("Maxon") warrants the Maxon TM-4800
Radio ("Product") manufactured by it against defects in material
or workmanship under normal use and service for two (2) years,
from the date of delivery to the original end user, provided that
the user has complied with the requirements stated herein. This
warranty is not assignable or transferable.

Maxon shall have no obligation to make repairs or to cause
replacement required which result from normal wear and tear
or necessitated in whole or in part by catastrophe, fault or the
negligence of the user, improper or unauthorized alterations,
repairs to the Product, use of the Product in a manner for which
it was not designed, or by causes external to the Product. This
warranty is void if the serial number is altered, defaced or
removed.

Maxon’s sole obligation hereunder shall be to repair or
replace the Product covered in the above warranty.

To receive warranty service, deliver or send the Product,
transportation and insurance prepaid, to the place of purchase
along with your proof of purchase. Alternatively, call Maxon
at 1-800-821-7848 for other locations or authorization to return
the Product directly to Maxon.

THE EXPRESS WARRANTIES CONTAINED HEREIN ARE IN
LIEU OF ALL OTHER WARRANTIES, EITHER EXPRESSED OR
IMPLIED OR STATUTORY, INCLUDING, WITHOUT LIMITA­TION, ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR PURPOSE.

FOR ANY PRODUCT WHICH DOES NOT COMPLY WITH THE
WARRANTY SPECIFIED, THE SOLE REMEDY WILL BE REPAIR

24

OR REPLACEMENT. IN NO EVENT WILL MAXON AMERICA,
INC. BE LIABLE TO THE BUYER OR ITS CUSTOMERS FOR
ANY DAMAGES, INCLUDING ANY SPECIAL, INCIDENTAL,
INDIRECT OR CONSEQUENTIAL DAMAGES, OR FOR THE
LOSS OF PROFIT, REVENUE OR DATA ARISING OUT OF THE
USE OF OR THE INABILITY TO USE THE PRODUCT.

* This Warranty is void for sales and deliveries outside the
U.S.A. For sales outside the U.S.A., contact Maxon America
or your local Maxon Dealer.

25

SECTION II

Model TMA-4474

Optional Microphone

with DTMF Keypad

26

We urge you to thoroughly read this section of the manual
before operating the TM-4800 radio with the TMA-4474
microphone.

NOTE: TM-4800 radio must be turned off when changing

the regular microphone to the TMA-4474 microphone.

About Your TMA-4474 Optional Microphone

Maxon's TMA-4474 optional microphone with backlit
DTMF keypad allows telephone interconnect when used
with the TM-4800 radio. This microphone also gives the
user easier access to TM-4800 functions.

When using the TMA-4474, the TM-4800 mobile has the
following additional features:

•

Telephone interconnect capability via the backlit DTMF

keypad

• Storage of up to 8 telephone numbers (of up to 14 digits in
length)

• Selection of system or group

• Initiates system or group scan modes

• Access to first available system scan (FASS)

• Access of repeater talk-around mode

27

Quick Reference Guide

Function Keys

Push-To-Talk bar (on microphone) places

transceiver in transmit mode

Changes SYStem number

Changes GRouP number

Initiates SCaNning mode

Talk-Around bypasses system when out

of range of system

Enable or disable Phone mode

28

SYS

SND

SCN

RCL

GRP

STR

PHONE

T/A

CLR

PHONE +

DTMF Enter telephone mode by pressing the
Keypad phone key then press the key that activates

the desired function.

Phone + SND "Send"- Automatically interconnects with
system and transmits telephone number displayed on the
radio LCD.

Phone + STR "Store" - Stores telephone number displayed
on the radio memory location 1 through 8.

Phone +RCL "Recall"- Recalls stored telephone number
from the radio memory location 1 through 8.

Phone + CLR "Clear"- Clears one digit at a time from the
radio display. To erase the entire number, press and hold
CLR until all the digits are deleted.

T/A

CLR

29

PHONE .... 1 - 8

TUV

SCN
RCL

+

PHONE

PHONE + .... 1 - 8

TUV

+

SYS
SND

GRP
STR

Function Keys

To activate these function keys, the radio should be in the

normal mode. If the radio is in phone mode, exit by
pressing phone button.

SYS "System" Selector Key - Pressing this key selects the
next programmed system. Only programmed systems will be
displayed. System number selected is located on the left side
of the radio display.

GRP "Group" Selector Key - Pressing this key changes
the selected group. Only programmed groups will be
displayed. Group number selected is located on the right side
of the radio display. Group name or identifier is shown in
main body of the radio display.

SCN "Scan" Key - Pressing this key initiates the scan
feature. When the SCN key is pressed followed by pressing
either the SYS (system) or GRP (group) key, system scan
or group scan is enabled. (See "Scan Modes").

T/A "Talk-Around" Key - Places the TM-4800 into the
talk-around mode on trunking and conventional systems
(dealer programmable option). Allows direct radio-to-radio
communication when out of range of the system.

30

1

2

ABC

3

DEF

4

GHI

5

JKL

6

MNO

7

PRS

8

TUV

9

WXY

*

0

#

SYSSYS

SYSSYS

SYS

SNDSND

SNDSND

SND

GRPGRP

GRPGRP

GRP

STRSTR

STRSTR

STR

SCNSCN

SCNSCN

SCN

RCLRCL

RCLRCL

RCL

T/AT/A

T/AT/A

T/A

CLRCLR

CLRCLR

CLR

PHONE

DTMF Keypad Keys 0-9, and symbol keys "*" and "#" for
entering telephone numbers to send or store in memory.

NOTE: If more than 7 digits are entered or stored in a
memory location, a left facing arrow will appear on the radio's
LCD display. This indicates that there are more digits
entered than can be displayed. Only the last seven digits
entered are displayed. To display any digits not shown, first
(STR) "Store" the entire number into a memory location and
then use (RCL) "Recall" to bring back the number. The first
digits will be shown for 1 second and the remaining 7 digits
will be shown and remain displayed until the function is
changed or the (RCL) "Recall" key is again pressed.

PHONE "Phone" Key - Places TM-4800 in or out of
phone mode. The phone key (in conjunction with other keys)
activates the secondary key functions. The secondary key
function is indicated under each primary function.

Enter telephone mode by pressing the phone key then press
the key that activates the desired function.

31

1

2

ABC

3

DEF

4

GHI

5

JKL

6

MNO

7

PRS

8

TUV

9

WXY

*

0

#

SYSSYS

SYSSYS

SYS

SNDSND

SNDSND

SND

GRPGRP

GRPGRP

GRP

STRSTR

STRSTR

STR

SCNSCN

SCNSCN

SCN

RCLRCL

RCLRCL

RCL

T/AT/A

T/AT/A

T/A

CLRCLR

CLRCLR

CLR

PHONE

Phone + SND "Send" - Transmits the telephone number
entered or recalled from memory on the radio's LCD.

Phone + STR "Store" - Stores a telephone number into the
radio memory. To store a number shown on the radio's
LCD, press STR (store) and a memory location number 1
through 8.

NOTE: Storing a displayed number will overwrite any
previously stored phone number in that memory location!

Phone + RCL "Recall" - Used to recall a telephone number
from memory locations 1 through 8.

Phone + CLR "Clear" - Deletes the last digit shown in the
radio display. To erase the entire number, press and hold

CLR until all the digits are deleted.

NOTE: The telephone number entered in the radio LCD

display will be erased when the power is turned off, and the
radio will automatically revert to the normal mode when the
power is turned back on.

32

1

2

ABC

3

DEF

4

GHI

5

JKL

6

MNO

7

PRS

8

TUV

9

WXY

*

0

#

SYSSYS

SYSSYS

SYS

SNDSND

SNDSND

SND

GRPGRP

GRPGRP

GRP

STRSTR

STRSTR

STR

SCNSCN

SCNSCN

SCN

RCLRCL

RCLRCL

RCL

T/AT/A

T/AT/A

T/A

CLRCLR

CLRCLR

CLR

PHONE

Scan Modes (using Model TMA-4474 )

Manual System Scan

System scan is initiated by pressing SCN, then SYS. Scan
mode is indicated by the word "SCAN" shown in the upper
center portion of the display. When scanning is actually
occurring, the words "IN SCAN" show in the display in
place of the unique group identifier. In addition, the system
numbers are incremented. Scanning is sequential through all
trunking and conventional systems, unless they are locked
out of scan as described under "System Lockout". When an
incoming call is detected, scanning stops and the call is
received. The display will indicate the system and group
identifier from which the call was received and the word
"SCAN" in the upper center portion of the display. When
the incoming call is complete, scanning resumes after a pre­determined pause. To exit scan mode, press and hold SCN
for 2 seconds. (See "Scan Resume Delay" for additional
information regarding the pause).

Manual Group Scan

To initiate manual group scan press SCN, then GRP.
Scan mode is indicated by the word "SCAN" shown in
the upper center portion of the display. When group scan is
actually occurring, the words "IN SCAN" appear in the
display in place of the unique group identifier. Group scan
occurs only on those groups enabled by your Maxon Dealer
for the selected system. When an incoming call is detected,
scanning stops and the incoming call is received. The display
changes to indicate the group identifier on which the call was
received and the word "SCAN" in the upper center portion
of the display remains. When the incoming call is complete,
after a brief pause, scanning resumes.

33

To exit group scan mode, press and hold SCN for 2 seconds.
(See "Scan Resume Delay" for additional information
regarding the pause).

Transmitting While Scanning

When a message is transmitted while scanning (i.e. the
words "IN SCAN" show on the display), dealer program­ming determines if it is transmitted on the "Last Active"
(floating) or on a pre-set "home" system and group. The
following describes operation for each configuration.

First Available System Scan

When you are out of range of a system when trying to
transmit, first available system scan (FASS) will scan
all systems programmed and look for the first system that
is in range of the radio.

To enter first available system scan (FASS), rotate the
on/off-volume control counter-clockwise to detent, shutting
off power to radio. Press and hold the SCN key on the
DTMF microphone while turning the radio power back on.
The word "FASS" will show in the upper center portion of
the radio display. When you attempt to transmit and the
selected system is out of range, the radio will emit a short
tone indicating the system is out of range and FASS mode
has started. When the radio detects a system in range,
scanning will stop and the radio will emit a short series of
tones (auto ringback tones) to indicate a system is in range.
Normal operation may resume. To exit the scan initiated by
FASS mode, press and hold SCN for 2 seconds. To exit
FASS mode, turn the radio off and then back on.

34

Telephone Calls

Telephone calls may be placed and received, provided that
your Dealer has programmed this feature into your Maxon
TM-4800 radio. The 8-memory locations can be pre­programmed by the Dealer for recall only or programmed so
that the telephone numbers can be changed by the user. The
following instructions pertain to placing telephone calls
which are made in the trunking mode only. Calls made in
conventional modes may vary depending on the system
setup. Consult your Maxon Dealer for specific information.

Placing a Telephone Call

Auto Interconnect Operation

A. Turn radio power on and set the volume as desired.

B. Select a system that contains an interconnect group. The

telephone icon will appear on the radio's LCD.
You may enter the phone mode from a
non-interconnected group but the

system selected
must have at least one telephone interconnect
group. (When the SND key is pressed the unit will
automatically select the first available interconnect
group and transmit the displayed telephone

number).

C. Select the phone mode by pressing the PHONE key

on microphone. The word "PHONE" will appear in
the upper right portion of the radio display.

D. Using microphone DTMF keypad, enter the number to be

dialed, or recall a number from memory locations
1-8, by pressing RCL 1-8. (Information on storing

35

and recalling a number from memory is detailed in
the following sections).

E. Press the SND key. The Maxon TM-4800 will access the

trunked group, send the phone number and return
to the receive mode.

NOTE: In some systems or with a very weak signal, it may
be necessary to press the P-T-T bar to access the dial tone
and then press the SND key.

F. When the called party answers, press the P-T-T bar to
talk and release to listen.

G. To release the call (to hang up), press and hold the P-T-T

bar and press the pound sign (#) key for 1 to 2
seconds. Then release the P-T-T bar.

NOTE: This step is important as well as good operating
practice. Pressing the pound sign (#) key instructs the system
that your call is completed. Additional interconnected billing
time may be incurred before the system automatically
terminates the call. In most systems this is 30 seconds, but it
may vary. Consult your Maxon Dealer for specific details.

Manual or Direct Dialing

A. Turn radio power on and set the volume as desired.

B. Select the system and group that has been programmed

for telephone calls. The "telephone" icon will appear
on the radio's LCD.

36

C. Press and hold the P-T-T bar to get the system

"Handshake". The radio's LED will glow red
and the clear-to-talk tone will sound (if programmed).

D. Momentarily release the P-T-T bar and listen for the

dial tone.

E. Press and hold the P-T-T bar while pressing the DTMF

keypad to enter the telephone number.

F. Release the P-T-T bar.

G. When the called party answers, press the P-T-T bar to

talk and release to listen.

H. To release the call (to hang up), press and hold the P-T-T

bar and press the pound sign (#) key for 1 to 2
seconds. Release the P-T-T bar.

Receiving a Telephone Call

A. Turn radio power on and set the volume as desired.

B. Select or scan the system and group programmed for

telephone calls. (When a group programmed for
telephone calls is selected, the "telephone" icon
appears on the radio display).

C. When a telephone ringing sound is heard from the radio

speaker, answer the call in the normal manner
(press the P-T-T bar to talk and release it to listen).
It is not necessary to select the phone mode to
receive a call.

37

D. When the call is finished, release the System's telephone

interconnect by pressing the P-T-T bar and the
pound sign (#) key for 1 to 2 seconds.

NOTE: This step is important as well as good operating
practice. Pressing the pound sign (#) key instructs the system
that your call is completed. Additional interconnected billing
time may be incurred before the system automatically termi­nates the call. In most systems this is 30 seconds, however it
may vary. Consult your Maxon Dealer for specific details.

Additional Telephone Calling Information

Entering Telephone Numbers

A. Press the PHONE key to enter the phone mode. The

word "PHONE" will appear in the upper right
portion of the radio display. The numeric DTMF
telephone keypad is now enabled.

B. Enter the desired telephone number by pressing the

corresponding number keys.

The Maxon TM-4800 allows you to enter the telephone
number at any desired rate. Errors can be corrected by

using the CLR key before "sending" the telephone number.
Numbers up to 14 digits in length can be entered. When
there are more than 7 digits entered, the overflow icon will
appear in the lower left portion of the LCD, next to the
group number. Numbers which have been stored into
memory locations 1 through 8 and recalled will momentarily
display the first overflow digits, and then the last 7 digits

entered.

38

Clearing Telephone Numbers

When a phone number has been entered, it will remain in
the radio display whenever you enter the phone mode. To
erase the last digit entered press the CLR key. To erase the
entire number, press and hold CLR until no information is
displayed.

To Store A Number In Memory:

A. Press the PHONE key to place the unit into phone mode.

B. Enter the desired number. Example:

1 8 1 6 8 9 1 6 3 2 0

C. Press STR.

D. Press memory location 1 through 8 (for example, "2").

The number 1 816 891 6320 is now stored in
memory location 2.

E. Clear the existing digits by pressing CLR until no

information remains in the display.

F. Repeat above steps for other desired memory locations.

NOTE: Storing a displayed number in a certain memory

location will overwrite any phone number previously stored
in that particular memory location.

To Recall a Number Stored In Memory

The stored numbers can now be recalled and sent by
selecting the phone mode, pressing RCL, the desired

memory number 1 through 8, and then SND.

39

Trunking Supervisory Tones

Busy Tone

This tone is similar to the standard telephone busy tone and
indicates that the radio system is currently busy. The tone
sounds for as long as the P-T-T bar on the microphone is
pressed, and the word "BUSY" appears in the upper right
portion of the radio display while this tone is sounding. If the
clear-to-talk tone is programmed, the busy tone does not
sound except when making a telephone call.

Intercept Tone

This is a siren-like tone (alternating high and low tones)
which indicates the following error conditions:

1) If this tone sounds after the transmit indicator flashes
several times and "RANGE" appears in the display, an
out-of-range condition is indicated. To complete a call, you
may need to get closer to your radio system. Once this tone
sounds, no more access attempts are made until the P-T-T
bar on the microphone is released and then pressed again.

2) If this tone sounds after the transmitter has been on for
an extended period and "TX TIME" also appears in the
display, the transmitter has been disabled by the time-out­timer feature.

3) If "TX INHIB" is displayed while this tone is sounding,
the selected system is temporarily being used by priority
groups.

NOTE: The range and busy tones can be stopped by
pressing either the SYS, GRP, SCN or PHONE keys
or by pressing and releasing the P-T-T bar.

40

Clear-To-Talk

When the clear-to-talk feature is programmed, it emits a
short tone which indicates when speaking can begin. (Refer
to "Clear-To-Talk" description for more information).

Key Press Tone

This is a short tone that sounds to indicate when a valid key
is pressed. The volume of the tone can be increased or
decreased by turning the on/off-volume control.

NOTE: The following tones are heard only when making
telephone calls. Type of tones varies depending on the
repeater system in use.

Reorder Tone

Three beeps indicate that the call has been terminated by the
system.

Return Time Warning Tone

Two beeps indicate that you have not transmitted recently.
If you do not transmit within a pre-programmed time period,
the call will be terminated and an alert tone will sound.
Length of tone depends on the repeater system being used.
The time between transmissions is one of the parameters
used by the system to determine when a call is finished (if the
pound sign (#) key has not been detected).

41

42

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 thirty-second period expires, the
call is automatically terminated.

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 P-T-T bar, and you may
partially hear this tone.

System Ringback Tone

If in first available system scan mode or after receiving
a "busy" indication when attempting to access a system
(trunking or conventional), the TM-4800 will emit ring
for one second to indicate a system is now available.

TMA-4474 Limited Warranty*

Maxon America, Inc. ("Maxon") warrants the Maxon
TMA-4474 accessory ("Product") manufactured by it against
defects in material or workmanship under normal use and
service for one (1) year, from the date of delivery to the
original end user, provided that the user has complied with
the requirements stated herein. This warranty is not assignable
or transferable.

Maxon shall have no obligation to make repairs or to cause
replacement required which result from normal wear and tear
or necessitated in whole or in part by catastrophe, fault or the
negligence of the user, improper or unauthorized alterations,
repairs to the Product, use of the Product in a manner for which
it was not designed, or by causes external to the Product. This
warranty is void if the serial number is altered, defaced or
removed.

Maxon’s sole obligation hereunder shall be to repair or
replace the Product covered in this warranty.

To receive warranty service, deliver or send the Product,
transportation and insurance prepaid, to the place of
purchase along with your proof of purchase. Alternatively,
call 1-800-821-7848 for other locations or authorization to
return the product directly to Maxon.

THE EXPRESS WARRANTIES CONTAINED HEREIN ARE IN
LIEU OF ALL OTHER WARRANTIES, EITHER EXPRESSED OR
IMPLIED OR STATUTORY, INCLUDING, WITHOUT LIMITA­TION, ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR PURPOSE.

FOR ANY PRODUCT WHICH DOES NOT COMPLY WITH THE
WARRANTY SPECIFIED, THE SOLE REMEDY WILL BE REPAIR

43

OR REPLACEMENT. IN NO EVENT WILL MAXON AMERICA,
INC. BE LIABLE TO THE BUYER OR ITS CUSTOMERS FOR
ANY DAMAGES, INCLUDING ANY SPECIAL, INCIDENTAL,
INDIRECT OR CONSEQUENTIAL DAMAGES, OR FOR THE
LOSS OF PROFIT, REVENUE OR DATA ARISING OUT OF
THE USE OF OR THE INABILITY TO USE THE PRODUCT.

* This Warranty is void for sales and deliveries outside the
U.S.A. For sales outside the U.S.A., contact Maxon America
or your local Maxon Dealer.

44

Maxon America, Inc.

10828 NW Air World Drive

Kansas City, Missouri 64153

816 / 891-6320

Fax: 816 / 891-8815