Lisheng LS-7500 User manual

ProfessionalFMTransceiver
- 1 -
Thank you for purchasing the UHF FM transceiver. High strength materials and
quality components have been used in the manufacture of this two-way radio. It
is designed for industrial use to excel in tough environment. Li-ion battery
technology and high/low power switching are included in many features that
enhance performance and keep the transceiver compact and easy to operate.
Precautions:
zStudy this manual carefully to understand your transceiver well.
zFor safety reasons, it is important that the user is aware of and under
tends the potential hazards common to using any transceiver.
zDon't operate the transceiver or replace the battery in an explosive
environment (dust, gas, fumes etc.).
zSwitch the transceiver off when filled gas or parked at a petrol station.
zDon't open or modify the transceiver in any way.
zRefer to a qualified technician for any service or repair.
zDon't expose the transceiver to long period of direct sunlight, extreme hot
environment or surface.
zDon't place the transceiver in excessively dusty, humid, wet and/or
unstable areas.
ProfessionalFMTransceiver
- 2 -
MAIN FUNCTIONS AND PEATURES
zConductible Output Power:3W±0.5
z16 Semi-duplex Channels
z16th Channel Scan
zSpeech Dial Function
zMonitor Function
zTOT (Time-out Timer)
zBattery Save Function
zLow Battery Alert Function
zQT/DQT
zBusy Channel Lock-out
zProgrammed By PC

ProfessionalFMTransceiver
- 3 -
CONTENTS
STANDARD ACCESSORIES------------------------------------------------------4
GUIDE OF BATTERY PACK CHARGING--------------------------------------5
WARNING FOR BATTERY PACK---------------------------------------------5-6
PREPARATION------------------------------------------------------------ --------6-8
Install/Remove The Battery Pack-------------------------------------------------6
Install/Remove The Antenna-------------------------------------------------------7
Install/Remove The Belt Clip-------------------------------------------------------7
Install The Optional Speaker/Microphone---------------------------------------8
OVERVIEW-----------------------------------------------------------------------------9
BASIC OPERATION----------------------------------------------------------------10
AUXILIARY FUNCTIONS-----------------------------------------------------10-13
Speech Dial Function---------------------------------------------------------------10
Monitor Function---------------------------------------------------------------------11
Time-out-timer------------------------------------------------------------------------11
Battery Save Function------------------------------------------------------------- 12
Low Battery Warning---------------------------------------------------------------12
QT/DQT---------------------------------------------------------------------------12-13
16th Channel Scan-----------------------------------------------------------------13
Busy Channel Lock-out-----------------------------------------------------------13
TROUBLESHOOTING GUIDE--------------------------------------------------14
STANDARD TECHNICAL SPECIFICATION--------------------------------15
QT FREQUENCIES TABLE(Hz)------------------------------------------------16
DQT CODES TABLE---------------------------------------------------------------16
Warning---------------------------------------------------------------------------------17
ProfessionalFMTransceiver
- 4 -
STANDARD ACCESSORIES
Carefully unpack the transceiver. We recommend you to confirm the following
items before discarding the packing If any item has missed or have been
damaged during shipment, please contact the suppliers immediately.
Antenna (1 pc) Charger (1 pc)
Battery Pack (1 pc) Belt Clip (1 pc) & Screw(2 pcs)
User's Manual (1 pc)

ProfessionalFMTransceiver
- 5 -
GUIDE OF BATTERY PACK CHARGING
1.Put the charger's cable to AC power's socket to
connect power, the green light remain bright.
2.Put the Li-ion battery pack in charger. The green light
will change to red indicating charging.
3.The red light will change to green when the battery is
fully charged.
4.To cut the power and take out the battery
pack.
WARNING FOR BATTERY PACK
The battery pack are not charged at the factory. Please charge it before using.
When charging the battery pack after purchasing or storing the transceiver for
more than 2 months, the capacity will not reach its normal capacity. Only after
2-3 charge/discharge cycles, the capacity will return to normal.
CAUTION
zDon't recharge the battery pack if it is already fully charged. Doing so may
cause the life of the battery pack to shorten or the battery pack may be
damaged.
zAfter recharging the battery pack, disconnect it from the charger. Charging
the battery pack for more than 5 days may reduce the battery pack life due
to overcharging.
Note:
zThe ambient temperature should be between 41 and 104 F(5 and 40 C) while
ProfessionalFMTransceiver
- 6 -
charging is in progress. Charging outside this range may not fully charge the
battery.
zAlways switch off the transceiver equipped with a battery pack before charging. Using
the transceiver while charging its battery pack will interfere with correct charging.
zThe battery pack life is over when its working time decreases even though it is fully
and correct charged. Replace the battery pack.
PREPARATION
Install/Remove The Battery Pack
The average life of the supplied Li-ion battery pack is 8 hours. Average time are
calculated using 5% transmitter time, 5% receiver time, and 90% standby time.
CAUTION
Don't short the battery terminals or dispose of the battery in fire.
Never attempt to remove the casing from the battery
pack.
1.Take the top of battery pack against the battery's
wafer of aluminum alloy intermediate.
2.Press the battery downwards slightly.
3.Press the transceiver lock upwards tightly with the
battery until a "da" sounds.
1.When you want to take out the battery pack, release
the transceiver lock downwards.
2.Take out the battery pack slightly.

ProfessionalFMTransceiver
- 7 -
Install/Remove The Antenna
zTo install the antenna, screw the antenna into the
connector on the top of the transceiver by holding the
antenna at its base and turning it clockwise until secure.
zTo remove the antenna from the base by
counter-clockwise untill pull out the antenna from unit.
Note:
Don't transmitting without antenna, it will damaged transciver. Please
turn off the transceiver when you install antenna.
Don't excessively bend the antenna as it ould become damaged and
affect the radios performance.
Install/Remove The Belt Clip
zTo install the belt clip, carry the belt clip to aim at the
hole who can fix the belt clip by screws.
Turning screws clokwise until lock tightly by tool.
zTo remove the belt clip turning the screws
conterclockwise by tool until them release.
ProfessionalFMTransceiver
- 8 -
Install The Optional Speaker/Microphone
1.Take out the jack cover from transceiver (See pic.1).
2.Insert the speaker/microphone plugs into the
Speaker/Microphone jacks (See pic.2).

ProfessionalFMTransceiver
- 9 -
OVERVIEW
Antenna
LED
Indicator Red light whil
transmitting a signal.
Green light while
receiving a signal.
Flashes red light when
the battery voltage is
low.
Speaker
Microphone
Power Switch/Volume
Control:
Turn clockwise to turn
ON the transceiver. Turn
counterclockwise until a
click sounds to turn OFF.
Rotate it to adjust the
volume level.
Channel Selector :
Rotate to select
channels 1-16.
PTT (Push-To-Talk)
Switch:
Press it, then speak
into the microphone to
call a station. Release
to receive.
Monitor Key :
You will hear
background noise
when hold on monitor
key to turn the squelch
OFF.
SPK/MIC Jacks
Battery Pack
ProfessionalFMTransceiver
- 10 -
BASIC OPERATION
Switch on the transceiver by turning the Power Switch/
Volume Control clockwise.
zA beep sounds.
Adjust the volume by pressing and holding the Monitor
key, then rotate the Power Switch/ Volume Control.
Rotate the Channel Selector to select your desired channel.
When you receive an appropriate signal, you will hear audio
from the speaker.
To make a call, press and hold the PTT key, then speak into
the microphone with your normal speaking voice.
Hold the microphone approximately 1.5 inches (3 to 4 cm)
from your lips.Release the PTT key to receive.
Note:
When the battery pack voltage becomes too low, transmission will
stop and the LED
will blink red. See "Low Battery Warning" on page 9.
AUXILIARY FUNCTIONS
All the functions below can be programmed by software. Some functions have
been switched off before leaving the factory and need to be programmed in
software.
zSpeech Dial Function
When you turn ON the power and switch the channels, the transceiver ill
speech the current channel number automatically. It will make your using

ProfessionalFMTransceiver
- 11 -
conveniently.
zMonitor Function
The squelch circuit on the transceiver mutes the speaker automatically,
when no signals are present. So you will not hear background noise.
Press and hold the Monitor key to deactivate the squelch by manual. This
is useful when you want to adjust the volume level, or when you need to
receive a weak signal.
The LED indicator lights green while the Monitor key is pressed.
Note:
It is default setup from factory, user can select other items of monitor operation by
pc programming.
OFF: Turn off the monitor function.
Monitor Lock: Momentarily press to hear background noise. Press the key again to
return to normal operation.
Monitor Momentary: Press and hold to deactivate QT/DQT signal. Release the
key to return to normal operation.
SQ-off Momentary: Hond on the key to hear backgroud noise, release it to return
to normal operation.
zTime-out Timer
The purpose of the time-out timer is to prevent any person using a channel
for a long time.
If the time that you continuously transmit excessds the set-up time, the
transceiver will stop transmitting and a tone "beep" will sounds. To stop
the tone, release the PTT key. You can press the PTT key again to
resume transmitting.
Note:
ProfessionalFMTransceiver
- 12 -
you can set up the time level:off, 30s, 60s, 90s,...... 300S. The unit is second.
zBattery Save Function
The battery save function decreases the amount of power used when a
signal is not being received and no operations are being performed (no
keys are being pressed, and no switches are being turned).
hile the channel is not busy and no operation is performed for 10 seconds,
battery save turns ON. When a signal is received or an operation is
performed, battery save turns OFF.
zLow Battery Warning
Low battery warning alarms you when the battery needs to be recharged.
While transmitting, if the battery power goes below a predetermined value,
the LED will blink red. When a tone "beep" sounds, the transceiver stops
transmitting. Replace or recharge the battery pack.
Note:
After 10 seconds you hear two sounds of "beep". The transceiver will repeat two
sounds of "beep" until you charge the battery.
zQT/DQT
Some channels may have pre-programmed QT/DQT tones. A QT/DQT
tone is a subaudible tone which allows you to ignore (not hear) calls from
other parties who are using the same channel. When you receive a signal
that has a tone different from the one which set up in your transceiver, you
will not hear the signal. Likewise, signals that you transmit will only be heard
by parties whose QT/DQT tone matches the tone set up in your
transceiver.
Note:

ProfessionalFMTransceiver
- 13 -
Although using channels set up with QT/DQT tones relieves you from listening to
unwanted calls, it does not mean your calls will be private.
z16th channel Scan
The scan function is useful when you want to find other people on similar
frequencies or to monitor communication within your group. Select
channel 16 and the scan will begin. If an active channel is found, the scan
will stop and lock on to that channel. You can now transmit
zBusy Channel Lock-out
The transceiver can be programmed with busy channel lock-out. When
setting, this function will disable the PTT key from transmitting if there is
any activity on the same frequency with a different QT/DQT tone. This
prevents interference in community repeater systems.
ProfessionalFMTransceiver
- 14 -
TROUBLESHOOTING GUIDE
Problem solution
No power.
zThe battery pack may be dead. Recharge or
replace the battery pack.
zThe battery pack may not be installed
correctly.
Remove the battery pack and install it
again.
Battery power dies
shortly after charging.
zThe battery pack life is over.
Please replace the battery pack with a new
one.
Can not talk to or hear
other members in you
group.
zMake sure you are using the same
frequency and QT/DQT as the other
members in you group.
zOther group members may be too far away.
Make sure you are within range of the other
transceivers.
Other voices (besides
group members) are
present on the
channel.
zChange the QT/DQT.Be sure to change the
tone on all transceivers within your group.
The transceiver
continuously rings.
zThe channel of transceiver is empty.
Please proramming it by software.
zThe frequencies you write in are going
beyond the frequency range of local
transceiver.

ProfessionalFMTransceiver
- 15 -
STANDARD TECHNICAL SPECIFICATION
General
Frequency Range 450-470MHz
Channels 16 channels
Channel Spacing 25 KHz
Working Voltage 7.2DC±20%
Operating Temperature Range -25℃-+60℃
Dimension(W×H×D) 58×115×31mm(not include antenna)
Weight(approx.) 180g(include battery)
Receiver
Sensitivit
y(
12db SINAD
)
≤0.2uv
Modulation Receiver Bandwidth ≥
|
±7KHz
Ad
j
acent Channels Selectivit
y
60dB
Intermediation ≥60dB
S
p
urious Res
p
onse ≥60dB
S
q
uelch Res
p
onse ≥60dB
Fre
q
uenc
y
Stabilit
y
±5
pp
m
Audio Out
p
ut Distortion 500mW
Transmitter
Conductible Output Power 3W±0.5
Modulation Mode F3E
Spurious Radiation ≤7.5uW
Adjacent Channel Power 60dB
Maximum Frequency Deviation ≤5KHz
Audio Output Distortion ≤5%
Frequency Stability ±5ppm
ProfessionalFMTransceiver
- 16 -
QT FREQUENCIES TABLE (Hz)
DQT CODES TABLE

ProfessionalFMTransceiver
- 17 -
Warning:
Changes or modifications to this unit not expressly approved by the
party responsible for compliance will void the user’s authority to
operate the equipment. Any change to the equipment will void FCC grant.
Safety Training Information
This radio generates RF electromagnetic energy during transmit mode.
This radio is designed for and classified as “Occupational Use Only”, meaning
it must be used only during the course of employment by individuals aware of
the hazards, and the ways to minimize such hazards. This radio is NOT
intended for use by the “General Population” in an uncontrolled environment.
This radio has been tested and complies with the FCC RF exposure limits for
“Occupational Use Only”. In addition, this radio complies with the following
Standards and Guidelines with regard to RF energy and electromagnetic
energy levels and evaluation of such levels for exposure to humans:
♦FCC OET Bulletin 65 Edition 97-01 Supplement C, Evaluating Compliance
with FCC Guidelines for Human Exposure to Radio Frequency Electromagnetic
Fields.
♦American National Standards Institute (C95.1-1992), IEEE Standard for
Safety Levels with Respect to Human Exposure to Radio Frequency
Electromagnetic Fields, 3 kHz to 300 GHz.
♦American National Standards Institute (C95.3-1992), IEEE Recommended
Practice for the Measurement of Potentially Hazardous Electromagnetic Fields–
RF and Microwave.
ProfessionalFMTransceiver
- 18 -
♦The accessories are authorized for use with this product. Use of accessories
other than those (listed in the instruction) specified may result in RF exposure
levels exceeding the FCC requirements for wireless RF exposure.
To ensure that your expose to RF electromagnetic
energyiswithintheFCCallowablelimitsfor
occupational use, always adhere to the following guidelines:
▲DO NOT operate the radio without a proper antenna attached, as this may
damaged the radio and may also cause you to exceed FCC RF exposure limits.
A proper antenna is the antenna supplied with this radio by the manufacturer or
antenna specifically authorized by the manufacturer for use with this radio.
▲DO NOT transmit for more than 50% of total radio use time (“50%duty
cycle”). Transmitting more than 50% of the time can cause FCC RF exposure
compliance requirements to be exceeded. The radio is transmitting when the
“TX indicator” lights red. You can cause the radio to transmit by pressing the
“PTT” switch.
▲ALWAYS use the accessories listed in this instruction when transmitting for
body-worn operation to ensure FCC RF exposure compliance requirements are
not exceed. When transmitting with a portable radio, hold the radio in a vertical
position with its microphone 2.5 to 5 cm (1 to 2 inches) away from your mouth.
Keep the antenna at least 2.5 cm (1 inch) from your head.

ProfessionalFMTransceiver
- 19 -
Occupational/Controlled Use
The radio transmitter is used in situations in which persons are exposed as
consequence of their employment provided those persons are fully aware of the
potential for exposure and can exercise control over their exposure.