HYT TM-628H User manual

RF Energy Exposure Compliance
Your radio is designed and tested to comply with a number of national and international standards
and guidelines (listed below) regarding human exposure to radio frequency electromagnetic
energy. This radio complies with the IEEE and ICNIRP exposure limits for
occupational/controlled RF exposure environment at operating duty factors of up to 50%
transmitting and is authorized by the FCC for occupational use only. In terms of measuring RF
energy for compliance with the FCC exposure guidelines, your radio radiates measurable RF
energy only while it is transmitting (during talking), not when it is receiving (listening) or in
standby mode.
Your radio complies with the following of RF energy exposure standards and guidelines
● United States Federal Communications Commission, Code of Federal Regulations; 47CFR
part 2 sub-part J
● American National Standards Institute (ANSI)/Institute of Electrical and Electronic
Engineers (IEEE) C95. 1-1992
● Institute of Electrical and Electronic Engineers (IEEE) C95. 1-1999 Edition
● International Commission on Non-Ionizing Radiation Protection (ICNIRP) 1998
Safety Information
The following safety precautions shall always be observed during operation, service and
repair of this equipment.
zThis equipment shall be serviced by qualified technicians only.
zDo not modify the radio for any reason.
zUse only HYT supplied or approved antenna.
zGain of antenna must not exceed 3.5dBi for VHF or 5.5dBi for UHF.
zMobile antenna Installation: Install the mobile antenna at least 100cm (34 inches)
away from your body, in accordance with the requirements of the antenna
manufacturer/supplier.
zTransmit only when people inside and outside the vehicle are at least the minimum
distance away from a properly installed, externally mounted antenna.
zMobile antenna substitution: Don’t substitute HYT supplied or approved antenna, or
excessive radio frequency radiation will result. Please contact your dealer or the
manufacturer for further instructions.
zPlease make sure there’s no stress on the antenna joint during transportation or
installation.

zTo avoid electromagnetic interference and/or compatibility conflicts, turn off your radio
in any area where posted notices instruct you to do so. Hospital or health facilities
may be using equipment that is sensitive to external RF energy.
zFor vehicles with an air bag, do not place a radio in the area over an air bag or in the
air bag deployment area.
zTurn off your radio prior to entering any area with explosive and flammable materials.
zDo not expose the radio to direct sunlight over a long time, nor place it close to
heating source.
▇Operation Guidelines
For vehicles equipped with electronic anti-skid braking systems, electronic ignition
systems or electronic fuel injection systems, interferences may occur during radio
transmission. If the foregoing electronic equipments are installed on your vehicle, please
contact your dealer for further assistance to make sure that radio transmission will not
interfere with these equipments.
For radio installation in vehicles fueled by LP gas with LP gas container within interior of
the vehicles, the following precautions are recommended for personal safety.
1. Any space containing radio equipment shall be isolated by a seal from the space in
which the LP gas container and its fittings are located.
2. Remote (outside) fitting connections shall be used.
3. Good ventilation is required for the container space.
▇Installation Guidelines
zVehicle installation: The antenna can be mounted at the center of a vehicle metal roof
or trunk lid if the minimum safe distance is observed.
zDo not mount the mobile radio overhead or on a sidewall unless you take special
precautions.
zIf the mobile radio is not properly installed, road shock could bump the radio loose,
and the falling radio could, in some circumstances, cause serious injury to the driver
or a passenger. In case of vehicle accidents, even when properly installed, the radio
could break loose and become a dangerous projectile.

1
Preface
Thank you for purchasing HYT TM-628H Mobile Radio. This easy-to-use radio will deliver you secure,
instant and reliable communication at peak efficiency.
To derive optimum performance from your radio, please read this manual and the supplied Safety
Information Booklet carefully before use.

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Icon Information
The following icons are available through this manual:
Caution: indicates situations that could cause damage to your radio.
Note: indicates tips that can help you make better use of your radio.
Copyright Information
HYT and Hytera are trademarks or registered trademarks of HYT in the PRC and other countries and/or
areas. HYT retains the ownership of its trademarks and product names. All other trademarks and/or
product names that may be used in this manual are properties of their respective owners.
The HYT product described in this manual may include HYT computer programs stored in memory or
other media. Laws in the PRC and/or other countries or areas preserve for HYT exclusive rights for HYT
computer programs. The purchase of this product shall not be deemed to grant, either directly or by
implication, any rights to the purchaser with respect to HYT computer programs. Any HYT computer
programs may not be copied, modified, distributed, decompiled, or reverse-engineered in any manner
without the prior written consent of HYT.
Disclaimer
HYT endeavors to achieve the accuracy and completeness of this manual, but no warranty of accuracy
or reliability is given. All the specifications and designs are subject to change without prior notice due to
continuous technology development. No part of this manual may be copied, modified, translated, or
distributed in any manner without the express written permission of HYT.
If you have any suggestions or would like to learn more details, please visit us at: http://www.hyt.cn.

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Contents
Checking Items in the Package......................................................................................5
Radio Overview ...............................................................................................................6
Front Panel..................................................................................................................6
Rear Panel ..................................................................................................................7
Programmable Function Keys.....................................................................................7
Installation .......................................................................................................................9
Instructions..................................................................................................................9
Installation Tools .........................................................................................................9
Installation Steps.........................................................................................................9
Status Indicators ...........................................................................................................11
LCD Icons .................................................................................................................11
LED Indicator ............................................................................................................12
Basic Operations...........................................................................................................13
Turning the Radio On/Off..........................................................................................13
Adjusting the Volume ................................................................................................13
Selecting a Channel..................................................................................................13
Selecting a Zone .......................................................................................................13
Receiving a Call ........................................................................................................13
Transmitting a Call ....................................................................................................14
Selecting the Power Level.........................................................................................14
BOT ID and EOT ID ..................................................................................................14
Functions and Operations ............................................................................................ 15
Monitor......................................................................................................................15
Scan..........................................................................................................................15
Busy Channel Lockout (BCL)....................................................................................17
BCL Override ............................................................................................................17
DTMF Call.................................................................................................................17
Code Squelch............................................................................................................19
Off Hook Decode.......................................................................................................20
Time-out Timer (TOT) ...............................................................................................20
Emergency Call.........................................................................................................21
Frequency Reverse...................................................................................................21
Talk Around...............................................................................................................21
Selectable Squelch Level (SQL) ...............................................................................22
User Selectable CTCSS/CDCSS (UST)....................................................................22
Public Address (PA)..................................................................................................22
Home Channel ...............................................................................................................................23
Rental........................................................................................................................23
Lone Worker..............................................................................................................24
2-Tone Encode Select (TTS).....................................................................................24
Display Frequency.....................................................................................................24
Display Mode ............................................................................................................24
Voice Compandor......................................................................................................25
Scrambler..................................................................................................................25

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HDC1200 ..................................................................................................................25
HDC2400TM ...............................................................................................................26
Short Message..........................................................................................................26
Troubleshooting ............................................................................................................31
Care and Cleaning......................................................................................................... 31
Optional Accessories.................................................................................................... 32

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Checking Items in the Package
Please unpack carefully and check that all items listed below are received. If any item is missing or
damaged, please contact your dealer.
Palm Microphone Microphone Hanger Microphone Hanger Screws
Mounting Bracket Kit Fuse Vehicle Power Cord
Owner’s Manual Safety Information Booklet Radio Unit

6
Radio Overview
Front Panel
No. Part Name No. Part Name
○
1Volume Control Knob ○ 2LCD Display
○
3Programmable Keys ▲/▼○ 4LED Indicator
○
5Speaker ○ 6Power On/Off Key
○
7Programmable Keys P1-P4 ○ 8Microphone Jack

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Rear Panel
No. Part Name No. Part Name
○
1Audio Connector ○ 2External Speaker Jack
○
3Power Inlet ○ 4Antenna Connector
Programmable Function Keys
For enhanced convenience, you may request your dealer to program the keys P1, P2, P3, P4, ▲and ▼
as shortcuts to the functions listed below:
No. Shortcut Keys Description
1 CH Up (▲by default)
2 CH Down (▼by default) To select a channel quickly
3 Zone Up (P3 by default)
4 Zone Down (P4 by default) To select a zone quickly
5 MONI A
6 MONI B
7 MONI C (P1 by default)
8 MONI D
To adjust the condition for incoming signal match.
9 Display Frequency To display current frequency quickly
10 Display Mode To switch display mode quickly
11 User Selectable Tone (UST) To change the CTCSS frequency of current channel
temporarily
12 2-Tone Select To select 2-Tone code quickly
13 TX Power Select To adjust power level through one button press
14 Scan (P2 by default) To monitor the signals on the predefined channel

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To add or delete the scan channel in non-scan status
15 Add/Delete To delete the nuisance channel temporarily in scan status
16 Frequency Reverse To reverse the TX and RX frequencies, and the
CTCSS/CDCSS encoding and decoding frequencies
17 Talk Around To transmit with the RX frequency and CTCSS/CDCSS
frequency
18 SEL SQL To select the squelch level quickly
19 Home Channel To switch to the home channel quickly
20 Public Address To output the amplified audio signals
21 Scrambler To safeguard the privacy of your talk through voice
encryption
22 Compandor To bring clearer voice under noisy environment
23 Emergency Call To summon help in emergent situations
24 HDC To select HDC call quickly
25 Lone Worker To ensure the safety of lone workers
26 Whisper To hear clearly even if the transmitting party speaks in
low voice
27 Short Message To quickly access the short message operation
28 Rental To time the rental service
29 Aux A To control the output from the port AUX A
30 Aux B To control the output from the port AUX B
31 Transparent Transmit Mode To enter the Transparent Transmit Mode quickly

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Installation
Before you install the radio in a vehicle, be sure to read the following instructions carefully:
Instructions
zThe radio operates with negative grounded power supply of 13.6 ± 15％V only. Please check polarity
and voltage of the power supply on vehicle before you install the radio.
zPlease check how long the screws will extend from the bottom surface of radio, before you install the
radio. Be sure to drill mounting hole with caution, to avoid damage of the vehicle wiring and parts.
zPlease connect the supplied antenna and power cord to the radio, before you install the radio in the
bracket.
zInstall the radio with HYT supplied mounting bracket, to avoid radio loose in case of accidents. The
loose radio may cause bodily injury.
zInstall the radio in a location where it’s easy to reach the front panel controls.
zPlease determine the location of mounting hole before drilling.
zPlease make sure there’s sufficient space at back of the radio for wiring.
zWhen the fuse for DC power cord needs replacement, it must be replaced by a fuse with the same
specification.
Installation Tools
zElectric drill: ¢6mm or above
zCross head screwdriver
zHex socket sleeve (used for mounting 4.8 × 20 mm self-tapping screw)
Installation Steps
1. Install the bracket in a location where it’s easy to operate the radio.
2. Connect accessories such as antenna and power cord to the radio.
3. Slide the radio into the mounting bracket and secure it using the locking knobs.
4. Install the microphone hanger in a location where it’s easy to reach the microphone.
5. Plug the palm microphone into the microphone jack on the front panel, and place it on the hanger
when you do not use it.

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No. Part Name No. Part Name
○
1Palm Microphone ○ 2Adjust Knobs
○
3Radio unit ○ 4Power Inlet
○
5Black Power Cord ○ 6Red Power Cord
○
7Fuses ○ 8Antenna Connector
○
9Flat Washers ○
10 Spring Washers
○
11 4 × 16 mm
Self-tapping Screws ○
12 Microphone Hanger
13 Mounting Bracket 14 4.8 × 20 mm Self-tapping Screws

11
Status Indicators
LCD Icons
The LCD of your radio displays the radio status. The following are the icons that appear on the radio’s
display.
LCD panel
Status Icons
Indicator Description
Displays CH number/name, zone number/name, DTMF number, frequency,
menu and options, etc.
Lo Indicates low power output.
Press the Monitor key:
1. The icon is displayed when CTCSS/CDCSS and 2-Tone decoding is
off.
2. The icon is displayed when the speaker is unmuted.
Appears when the radio begins to scan.
Appears when the radio is transmitting a selected call.
C indicates that the current channel is in the scan list.
Z indicates multi zone scan.
Appears when the Scrambler feature is enabled.

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Appears when the Compandor feature is enabled.
Appears when the current channel is already in use.
Indicates the current channel is the priority channel. P• indicates priority
channel 1, P.indicates priority channel 2, P:indicates priority channels 1 and
2.
LED Indicator
The LED indicator will help you easily identify current radio status.
LED Indicator Radio Status
LED glows red Transmitting
LED glows green Receiving
After the 2-Tone, HDC1200 or HDC2400TM or DTMF signaling is decoded, and
during the auto reset time.
LED flashes orange After the 2-Tone, HDC1200, HDC2400TM or DTMF signaling is transmitted, and
during the auto reset time.

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Basic Operations
Turning the Radio On/Off
Press the Power On/Off key to turn on the radio.
Press and hold down the Power On/Off key for about 1 second to turn off the radio.
Adjusting the Volume
Turn the Volume Control knob clockwise to increase the volume, or counter-clockwise to decrease the
volume.
Note:During adjusting, if the radio is programmed with CTCSS/CDCSS or 2-Tone, HDC1200,
HDC2400TM Signaling squelch, noise will not be heard from local speaker even though you
turn the Volume Control knob fully clockwise.
Selecting a Channel
The ▲/▼and P1-P4 function keys are programmable by your dealer to select a channel. The RX/TX
frequency on each channel is set by your dealer.
Press the programmed CH Up key to select a higher numbered channel; press the programmed CH
Down key to select a lower numbered channel.
Selecting a Zone
The ▲/▼and P1-P4 function keys are programmable by your dealer to select a zone. The RX/TX
frequency on each channel is set by your dealer.
Press the programmed Zone Up key to select a higher numbered zone; press the programmed Zone
Down key to select a lower numbered zone.
Receiving a Call
If CTCSS/CDCSS, 2-Tone, HDC1200 or HDC2400TM is set on the current channel by your dealer, you
can receive calls with matched signaling only. If CTCSS/CDCSS, 2-Tone, HDC1200 or HDC2400TM is
not set, you can hear from all the users on the same channel.

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Transmitting a Call
When transmitting a call, please follow steps below:
1. Hold down the PTT key on the microphone.
2. Speak into the microphone. The red LED lights during calling.
3. Release the PTT key to return to the RX mode.
4. When the transmission ends, put the microphone on hook.
Selecting the Power Level
If the current channel is programmed with high power by your dealer, the power output toggles between
high and low upon each press of the programmed Tx Power Select key. The LOicon is displayed on
LCD to indicate low power.
A lower power level saves battery and reduces the possibility of interference. Use the high power setting
only when necessary.
Note:
If the current channel is programmed with lower power, any Tx Power Select key press will prompt
an error tone, and the power level will not change.
If you switch to low power on a channel that was set with high power, this configuration will work on
all other channels that were set with high power.
BOT ID and EOT ID
Your dealer may configure whether to transmit Connect ID (BOT ID) and Disconnect ID (EOT ID), when
connecting or disconnecting a repeater or telephone system. The following modes are programmable:
1. Press the PTT key, and the BOT ID is transmitted.
Release the PTT key, and the EOT ID is transmitted. .
2. Press the *key while holding down the PTT, and the BOT ID is transmitted.
Press the #key while holding down the PTT, and the EOT ID is transmitted.

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Functions and Operations
Monitor
If the Monitor function is set by your dealer, press the programmed Monitor key in Rx mode to get aware
of the activities on the current channel.
The Monitor key is programmable with one of the following four operating modes by your dealer:
1. Carrier Squelch-Momentary
Hold down the Monitor key to open CTCSS/CDCSS/2-Tone Signaling squelch, and release the key to
close the Signaling squelch.
2. Carrier Squelch-Toggle
Press the Monitor key to open CTCSS/CDCSS/2-Tone Signaling squelch. Press again to close the
Signaling squelch.
3. Squelch Off-Momentary
Hold down the Monitor key to open carrier squelch, and release the key to close the carrier squelch.
4. Squelch Off-Toggle
Press the Monitor key to open carrier squelch. Press again to close the carrier squelch.
Scan
▇Scan Type
1. Single Zone Scan
The radio scans all the channels added into the scan list on the current zone.
2. Multi Zone Scan
Multiple zones added into a multi scan list can be scanned. All channels within the zones added into the
scan list can be scanned.
▇Scan Start
1. Add one or more non-priority channels into the scan list.
2. Press the programmed Channel Scan key to initiate scan from the current channel (please scan the
channels one by one in accordance with the list). The LCD displays SCAN (-SCAN- for multi zone
scan) and the icon.
▇Scan Cease

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The scanning pauses or ceases upon the following:
1. Press the programmed Channel Scan key and cease the scanning, so that the radio may exit the
scan mode.
2. Activate the Monitor function.
3. The radio receives the carriers which satisfy radio unmute condition
▇Scan Resume
If the scanning pauses on an active channel, it will resume according to the scan resume mode. The
scan resume mode can be programmed by your dealer with Carrier operated scan or Time operated
scan.
1. Time Operated Scan
Scanning remains on an active channel for a programmed time period (programmable by your dealer).
Once the timer expires, the radio will begin scanning other channels even if the active channel is still
busy.
2. Carrier operated scan
If carriers are detected during the scan sequence, scanning will remain on the active channel until there
is no activity.
▇Dual Priority Scan
If dual priority channels are programmed by your dealer, the radio will check the dual priority channels for
activity regularly on the non-priority channels. If carriers are detected on a priority channel, the radio will
immediately switch to this active priority channel.
LCD displays the “P" icon to indicate the Priority Channel 1, the “P. ” icon to indicate the Priority Channel
2, and the “P:” icon to indicate the channel is programmed with Priority Channel 1 and 2 simultaneously.
▇Scan Add/Delete
If the Scan Add/Delete feature is enabled by your dealer, the current channel can be added to/deleted
from the scan list in the following procedures:
1. Select the channel to be added/deleted in the non-scan mode.
2. The current channel toggles between Add/Delete status upon each press of the programmed Scan
Add/Delete key.
Note: Only channels added into the scan list can be scanned.
Nuisance Channel Delete▇

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Channels in the scan list are allowed to be temporarily deleted
When the scan pauses on an unwanted channel, such as a nuisance channel, press the programmed
Add/Del Scan key to temporarily delete the channel from the scan list, and then the scan reinitiates
immediately.
Note: The temporarily deleted channel will recover its settings prior to the scan after the radio
exits the scan mode.
▇Revert Channel
If you press the PTT key, the scan will be turned off and the radio will switch to the Revert Channel to
transmit. This feature is programmable by your dealer.
▇Off-Hook Scan
If this feature is enabled by your dealer, the radio will be allowed to scan no matter whether the palm
microphone is in an off hook position or not. Otherwise, the scan will be disabled with an off-hook palm
microphone.
Busy Channel Lockout (BCL)
The feature helps prevent transmission on a channel that is already in use, and it can be
enabled/disabled by your dealer. If you press the PTT key on a busy channel, transmission will be
inhibited and an alert tone will sound. If the PTT key is released, the alert tone will cease and the radio
will return to Rx mode. When the channel is free, press the PTT key again to transmit.
BCL Override
If this feature is enabled, you can override the BCL feature to transmit on a busy channel. If you press
the PTT key, a BCL alarm will be heard; press the PTT key again within 0.5 seconds to override the BCL
feature and transmit on the busy channel.
DTMF Call
▇Manual Dial
Hold down the PTT key, and then press any key on the DTMF keypad of the microphone to transmit the
corresponding DTMF signal. Meanwhile, you may hear relevant tones.
Release the PTT key to remain transmission for 2 seconds (programmable by your dealer), and then
press another numeric key within 2 seconds to continue the transmission.

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▇Keypad Auto PTT
If this feature is enabled by your dealer, press any numeric key to transmit DTMF signal without PTT key
press.
Stor▇e & Send
When this feature is enabled, enter a pre-stored DTMF number (up to 16 digits) in Rx mode, and then
press the PTT key on the microphone to initiate a call; simultaneously, the dialed DTMF number scrolls
across the LCD, and the corresponding DTMF tone can be heard.
Note:
If you have dialed a wrong number or you want to cancel the dialing, you just simply press any key
on the front panel other than the Power On/Off key to exit.
“D” can be programmed by your dealer as a blank tone, that is, if you enter “D”, the tone will not be
heard during transmission, but there will be a delay in time, which is programmable by your dealer.
▇DTMF Speed
The DTMF number is programmable by your dealer.
The feature is designed to reduce decoding errors by providing a fixed interval between digits. It is 10
DTMF numbers per second by default.
▇Store the DTMF Number
You are allowed to store a DTMF number (up to 16 digits) in 32 Speed Dial memories respectively as
follows:
1. Press the #key on the microphone keypad, and the LCD displays D ------.
2. Enter the desired number (range from 0~9, A~F) via the microphone keypad. If you want to enter A, B,
C, D, E and F, hold down the PTT key and then enter 2, 5, 8, 0, * and # respectively.
3. Press the #key, and “D” on the LCD is followed by a symbol “ --”, which indicates the location to enter
memory numbers.
4. Enter the desired memory number (01~32).
5. Press the #key again on the microphone, and then the entered number is stored into its
corresponding memory.
If you have dialed a wrong number or you want to cancel the dialing, please press any key on the front
panel other than the Power On/Off key to exit.
▇Confirm the Stored DTMF Numbers