ITC T-521UH User manual

Ture Diversity MIC System
User Manual
T-521UH
T-521UT
T-521UL
Before using the system, please read this manual first

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Thank you for choosing our UHF wireless microphone.
Please read the manual carefully before operation, to study
the correct operation method to gain the best application effect.
This device adopts UHF double diversity reception and DPLL
multi-channel frequency synthesis technology. It provides 200
channel selections for each frequency bandwidth 800MHz,
700MHz and 600MHz by 250KHz channel spacing, in order to
avoid interference easily.
Hand-held wireless microphone UHT and hanging transmitter
are both equipped with high and low power conversion function.
The power is supplied by two AA batteries. The service time shall
be longer if using alkaline high energy battery, for example, 10
hours for high power and 15 hours for low power. On the contrary,
the service time shall be shorten if using rechargeable battery.
Adjust the sensitivity of transmitter correctly is the most
important, because signal distortion may be happened if
sensitivity is too high and signal noise ratio may be reduced if
sensitivity is too low. Users don’t need to adjust the sensitivity of
the handheld microphone, because it’s already adjusted to a
suitable level. However, the sensitivity of ULT hanging transmitter
can be adjusted through the lapel microphone, headband
microphone and outer audio source.
During the high power status in the same space, 16
transmitters used with the same frequency channel will not cause
mutual interference. But mutual interference will happen if the
frequency is set inappropriately. During the low power status, for
example, in KTV room and classroom, about 200 transmitters can
be used at the same time and will not cause the mutual
interference.

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1. Transmitter Framework and Function
Front Panel
TELETRONR
①② ③④⑤②③ ④⑥
Back Panel
DC INPUT ANT B
BAL A OUT
UNBAL OUT
BAL B OUT
12-15V 800mA UNBAL A
BA+B
ANT A OUT
⑦⑧ ⑧ ⑨⑩⑾ ⑨⑿
1) Mounting Ear. If to put in 19 inch rack, please screw off the two
nails on the sides of the device, then fix the ear on nail hole sites.
Nylon can separate the noise interference from the amplifier and
other devices.
2) Function Key. Press “SET” key to cycle pick the main menu,
stop 2~3 seconds to choose one menu and current set state will
be showed on the screen. Press “▲▼” key to change or reset the
menu, then press “SET” key to take effect.
3) LCD screen. Display the operation mode, frequency/channel,
audio output intensity. LCD screen will be on when power is switch
is on.
4) Volume adjusting knob. To adjust the output volume of
transmitter.
5) Frequency pairing window.
6) Power switch. When the switch is on, the LCD screen is on.
Long press the switch to turn off the power.
7) Power socket. 12V DC/1A power input socket, positive inside

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and negative outside.
8) Antenna pedestal. BNC pedestal.
9) Audio balance output. Adopt “XLR” plug seat, two channel
signal output separately.
10) Toggle switch to A+B. Two channels will be combined to one
channel as unbalanced output.
11) Toggle switch to B. B channel unbalanced output.
12) Toggle switch to A. A channel unbalanced output.
2. How to operate the receiver
1) before the start, not open the transmitter, turn the receiver
volume to minimum, and then press the power button to open the
receiver. When the power is turned on, the LCD screen back
ground lights, all the characters are displayed in the same
shutdown state of the last time. then the main display column
shows the receiver channel, frequency, automatic frequency state,
squelch level, the "SET" button can make the main display in
various content menu.
2) Before the system be turned on, you should observe the
auxiliary display bar of the RF and AF level meter, if there is a
strong interference, should change the channel to avoid
interference or small receiver sensitivity in the menu.
3) Open the transmitter power, such as transmitter and receiver to
different frequency, the frequency. RF level intensity control after
the completion of the corresponding channel frequency receiver
display full lattice, the receiver to adjust the volume to the
appropriate size, and then the microphone pronunciation, receiver
AF level strength with pickup size variation. If there is no sound
output and RF level display, this system does not work properly,
we must overhaul.

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4) 3 open the transmitter power, such as transmitter and receiver
to different frequency, the frequency
3.Operating instruction of the liquid crystal display panel
(1) LCD full bright display
①8RF display: display the received radio frequency signal
strength
②8audio level display: display the level of the audio signal
③Frequency menu display: when FREQ is light, the six
characters displays the current operating frequency
④Channel menu display: when CHAN is light, it displays the
current working channel
⑤Six characters display: display working state of frequency,
frequency/channel, noise level or menu content
⑥MUTE display:When mute is light, then no RF signal is
received
⑦Channel selection display: Dynamic display of the current
received channel

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(2) Key functions and operation
Press "SET" key to choose menu and confirm the configuration.
Press “▲”“▼”adjust the currently selected menu, then press
"SET" to confirm to setting.
Long press “▲”and "▼"keys can quickly set frequency,
channels.
(3) Instructions for the LCD panel
AFrequency setting: press "SET" button, select PRG IR for 2
seconds, infrared data would be sent to the transmitter.
BMenu in main display column
Press “SET”display the below:
After 2-3 seconds it will display the below:
(Note:Which of the above will be showed depends on the previous set)
This menu is for selecting the main display column, when
press “▲”or "▼"key, the LCD shows "CHANNL" or "FREQU".
Select "CHANNL" it displays the channel number, select "FREQU"
it displays the current working frequency.

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Please click the "SET" key to confirm after your selection,
otherwise it is invalid, the main column will keep the previous
display. When you changed the choice but not confirm the LCD
screen after 2-3 seconds, it will remind by flashing, press the
"SET" key then the LCD stop flashing.
CDisplay and adjustment of Channel/frequency
Press “SET”to make the LCD display the below:
(Note:Which of the above will be showed depends on the previous
set)
This menu displays the current working frequency or channel
of the receiver, press “▲”key “▼”button to change the current
channel or frequency, after change the frequency or channel,
please press the "SET" key to confirm and make the receiver
works in the selected frequency or channel. Otherwise the
adjustment will be invalid, the receiver will still work in the previous
channel/frequency.
When you changed the choice but not confirm the LCD screen
after 2-3 seconds, it will remind by flashing, press the "SET" key
then the LCD stop flashing.
DReceiver noise control
Press “SET”to display the below:

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After 2-3 seconds it will display:
This menu is used to adjust the receiver noise, in order to
enhance anti-jamming capability of the system. Adjust the range is
from 0to 40 db, the greater the value, the lower the sensitivity, the
closer distance, the stronger anti-interference ability. Whereas the
smaller the value (minimum in 10 db), the higher the sensitivity of
the farther the distance, but the anti-interference ability will decline.
When normal use, please set in 15 db (the default factory setting
is 15 db)
Push “▲”or "▼"button to adjust the data, press the “SET”to
confirm the adjustment, otherwise the sensitivity will stay as
previous.
Without press “SET”after data adjustment for 2-3 seconds,
the LCD will remind by flashing, press the "SET" key then the
LCD stop flashing.
EThe system lock operation
Press “SET”to display the below:

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After 2-3 seconds it will display:
(Note:Which of the above will be showed depends on the previous
set)This menu function is, whether lock the current receiver
working status (channel, sensitivity, in the main display column,
the power switch, etc.), if shows "LOC ON", it can't change the
current working status and the machine can not be turned off; If
shows "LOC OFF", the can change all the menu functions.
Please click the "SET" key to confirm after your selection,
otherwise it is invalid, the main column will keep the previous
display. When you changed the choice but not confirm the LCD
screen after 2-3 seconds, it will remind by flashing, press the
"SET" key then the LCD stop flashing.
4. Infrared frequency wireless microphone hand-held
transmitter
4.1 Framework and Function
2 3
4
5
1
6
710
8
⑨

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(1) net head and a sound head module: net head is used to
protect the voice into the sound head module of audio signals,
eliminating tuency / channel and battery.
(2) liquid crystal display: displayfreqhebootstate;3secondslong
for shutdown state.
(3) the power switch: touch click for the "POP" wind noise, and
can prevent the microphone placed rolling on the table.
(4) infrared frequency window with the SET key: the receiver, the
channel parameters are transmitted to the transmitter
(5) high and low power switch: used to convert the microphone
high / low emission power.
(6) Locking switch: used to lock the keys, in the "ON" button, an
external power supply cannot be shut down only mute, meet the
requirements of special occasions, to avoid in the course of the
performance error action.
(7) Microphone pipe: pipe end assembly head, the sound head
module, the tube body battery, emitting circuit board, tail built-in
antenna.
(8) Battery window: with 2 AA batteries
(9) PC tail pipe
4.2 Operation Manual
MIC LED
After turning the power on, the LED back light bright, liquid

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crystal display the current working channel and battery. If you
need to change the channel, the receiver channel should be
changed first. And then match the transmitter and receiver for
infrared alignment frequency window, and press the "SET
receiver". Then the new frequency channel parameters will be
sent to the transmitter.
5. Infrared frequency wireless microphone lavalier
transmitter
Name and function of each parts
④
⑤
⑥
⑦
⑧
⑨
⑧＋－
1 2 3
⑩

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(1) Audio input connector
(2) Power switching: turn the switch to “ON” position when using;
turn it to “OFF” position when not using
(3) Status indicator: when the switch is turned to “ON” position, the
indicator will flash, which means the battery level is normal; if it
does not flash, it means the battery is no power or not well
installed; if the indicator stays on, it means the battery is dying and
needs to be changed
(4) Transmitting antenna: the transmitting antenna is a 1/4 wave
whip
(5) LCD panel: it displays the current working frequency/channel
and the battery level
(6) Infrared frequency window: it works with the SET key of the
receiver to deliver the channel dates to the transmitter
(7) Battery compartment: it contains 2 pcs AA batteries
(8) Battery cover: it covers the batteries after installing the 2 pcs
AA batteries
(9) The adjust or of the transmitting audio sensitivity
(10) High & Low Function conversion keys: It is designed for
converting the high and low transmitted power
6. Operation
Pressing lightly on both ends of the battery cover to pull out
the battery compartment. The operation is as same as the
handheld mic, which also has the functions of high & low power
switching and adjusting of transmitting audio sensitivity to adapt to
different sound other audio sources.
6.1 How to use the hanging wireless transmitter
(1) The hanging mic transmitter adopts a 1/4 wave whip, which
could not directly contact with human body or twine with the mic

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wires, otherwise it will reduce the use effect.
(2) The sensitivity should be adjusted according to different audio
sources and mics.
(3) While using the clip mics, in order to keep the voice not up and
down by the rotation of the head, you should put the clip mic in the
middle position and fix the mic wire to avoid any friction noise.
(4) The sound head of the headset mic should be put beside the
mouth. The voice could be increased by adjusting the distance
between the mouth and the sound head.
(5) When using the clip mic in the sound system, it is better to
choose the directional sound head and the speakers with less
acoustic feedback. For the sake of reducing acoustic feedback,
feedback suppressor should be used as well.
6.2 How to use the handheld wireless mic
(1) Your hand should be held in the centre of the mic. Do not put
your hand closed to the mic head or the sound pickup effect will be
influenced. If closed to the bottom antenna, the emission
efficiency and the using range will be reduced.
(2) Adjust the distance between the mic and your mouth to
increase or decrease the voice.
6.3 How To Use Receiver Correctly
(1) Receiver is divided into two categories, diversity and non
diversity. Non diversity is economy, while diversity has longer
transmission distance and better transmission effect. Users can
choose reasonably according to their demands.
(2) When using omnidirectional antenna, antenna shall have 0.5
meter’s distance from the wall, especially metal form.
(3) Receiving range is related to many factors. It can gain a better
transmission effect when there is no large metal obstacle on the

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transmission direction.
(4) If receiving condition is not good, extension cord and high gain
antenna can be adopted，or even to add antenna amplifier to get
a very obvious long distance transmission effect.
(5) When receiver panel face to the application direction, or that
when receiver is put in metal box, connect the antenna to front
panel shall gain a better receiving effect.
6.4 Using Many Sets of Microphone at The Same Place
(1) Choose the frequency allocation without inter modulation.
Within the 25MHz band with, it usually can using 8 transmitters at
the same time. Other frequency channel type shall be used if
users need more than 8 sets transmitters.
(2) When using many transmitters at the same time, there shall be
more than 20cm’s distance between each transmitter to avoid
mutual interference.
(3) When using many receivers at the same time, high gain
antenna, antenna amplifier and receiving shut is suggest to
installed.
(4) If the transmitter is set as low power, 100 transmitters can be
used within the same frequency channel, such as in KTV room,
classroom.

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7. Fault processing and preservation
Fault Phenomenon Fault Reasons
No indication from the
Transmitter and Receiver The battery of transmitter runs out or the power connection of the receiver is loose.
No radio
wave from the receiver The received frequencies are different or out of the receiving range
There is radio wave
but without any audio
signal
The mic of transmitter is not connected or
the squelch of the receiver is too high
The background noise of
audio signal is too big
The transmitting modulation is too weak
and the received output level is too low to
cause the interrupt signal.
Audio signal distortion The transmitting modulation is too strong
and the received output level is too high
The using distance is too
short and the signal is not
stable
The power of transmitter is set at low
level and the receiver squelch is too high.
The antenna of the receiver is not set
properly and there is strong
electromagnetic interference
Do not unpack or repair the machine by yourself if the failures
are not contained in the above table. Pls contact with the
manufacturer or your local dealer.

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Operation and Preservation: Don't put the unit in high humidity
or strong magnetic field, or under strong direct sunlight, or high
temperature environments. The receiver power and transmitter
batteries should be brought out if there is no operation for a long
time.
Clearance: Pls unplug the power socket before clearance and
use the stupe to clean it. Never use any cleaner or soluble liquid,
or it will damage the surface machining layer.
Power Supply: Ensure the power supply is within the range of
requirement. Too high or too low power will affect the machine’s
performance. When put the transmitter into battery, do not install
the battery backwards , otherwise the machine may be damaged.
Maintenance: If the machine has a fault or performance
degradation, in order to avoid electric shock or severe damage or
warranty right loss, please do not remove the shell for repair by
yourself . Pls contact with the local dealer or the manufacturer,
and we shall provide our best service for you.
Accessory: Pls use the accessories provided and apporved by
the manufacturer to make sure the best performance.
Warranty: There is no modification section in the unit. Pls do not
take it apart, or you will lose the warranty right.

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8. Specifications
Frequency range: 640-690MHz and 740-790MHz，,807-857MHz
Frequency oscillation mode: phase-locked loop
Total channels: 600 CH
Frequency response: 50Hz---18KHz
Working distance: 300
Frequency bandwidth: 25MHz
Carrier Wave stability: ±5PPm≤10KHz
Cross talk: >80dB
S/N Ratio: >105dB(1KHz-A)
Sensitivity: -105dBm(12dB S/N AD)
THD: <0.5%@1kHz
Output Impedance: 2.2kΩ
Audio output bit: -12dB
Mute mode: Mute and Tone key squelch loop
Function display: LCD
Power supply: 12V 1A
Output Connector Mode: Balanced XLR Connector
Unbalanced TRS: 6.3mm connector