JTS RU-901Du User manual

Instruction Manual
UHF PLL
With JTS 2.4G RF Synchronizing Technology
R-901Du
2
Channel Receiver
RU-901Du /

One year product warranty
Warranty description
1. Be sure to put the warranty label indicating purchase date on the bottom of
equipment to ensure your interest in maintenance and service.
2. Product warranty, starting on the purchase date indicated on “warranty
label”, will last for one year; if the equipment does not have “warranty label”,
the warranty period is 15 months from the manufacturing date. If a micro-
phone is broken but not sent back with the equipment, the warranty period is
15 months from the manufacturing date of the microphone.
3. Within the warranty period, if the equipment is broken under normal use as
instructed in manual, please contact the original selling store for repair.
4. When the product is returned for repair, to facilitate proper determination of
cause of malfunction and of whether repair fee is needed, please ship back
the equipment and microphone together.
5. Within the warranty period, our company provides repair service at no cost
except for the following conditions that parts and repair may be charged:
a.Damages due to natural disaster or irresistible outside forces.
b.Damages due to drop, water, moisture, corrosion, foreign objects, missing
components.
c.The warranty does not cover consumable parts. (such as microphone
capsule, ball grille etc.)
d.Those without “warranty label” on equipment or with “warranty label” being
damaged and failing to identify warranty period.
6. Please keep the warranty properly. No replacement will be made if the war-
ranty is missing.
Equipment
serial number
Contact
number
Address
Purchase date
Selling store
stamp Be sure to put store stamp and ll in purchase date for the warranty to be
e󰀨ective!
Product Model
Customer
name

1. Notes for system operations
2. Features
3. Specications
3-1 UHF PLL Dual-channel True Diversity receiver// RU-901Du
3-2 UHF PLL hand-held transmitter // R-4TH
4. Description of parts
4-1 UHF PLL Dual-channel True Diversity receiver // RU-901Du
4-2 UHF PLL hand-held transmitter // R-4TH
4-3 Accessories
5.Connecting
5-1 How to connect the receiver// RU-901Du
5-2 Transmitter installation // R-4TH
6. Instructions for use
6-1 How to use// RU-901Du
6-2 How to use// R-4TH
7. Notes for the product
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1
2
2
3
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7
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11
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18
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INDEX

WIRELESS MICROPHONE SYSTEM
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1. Notes for system operations
• Before connecting to power, make sure the voltage marked on
equipment is the same as that on the power socket.
• Do not leave the unit at where the humidity and temperature are high.
• Dry your hands before operating the system.
• Keep the unit away from re and heat source.
• Turn the volume to minimum at both the mixer and amplier before
setting up the system.
• Caution : The suitable environment for this product is with a temperature
between- 10°C (14°F) and +50°C (122°F).
2. Features
• 3rd generation True Diversity system.
• Transmission power selectable between '"High" and "Low".
• 6 groups are provided as default. Every group contains up to 23 default
channels.
• There are in total 1,441 channels to choose from.
• 36MHz bandwidth.
• The patented RF pairing for synchronized setting of all
parameters.
• Channel scan.
• Adjustable receiving sensitivity.
• Automatic microphone power o.
• Charging contact ready.

2
3. Specications
3-1 UHF PLL Dual-channel True Diversity receiver // RU-901Du
Frequency Oscillation Mode Phase-locked loop (PLL)
Carrier Frequency Range 470~608MHz
Remoset Frequency 2.4G RF
Diversity True diversity
Bandwidth 36MHz
Signal/Noise Ratio >105dB(A)
Total Harmonic Distortion (Thd) <0.6%@1KHz
Receiving Sensitivity -95dBm，S/N>80dB
Image Rejection Ratio >80 dB
Frequency Response 50Hz~16KHz±2dB
Antenna Type 1/2λ BNC detachable
Antenna Booster Power DC12V/100mA
Function Display By LCD
Contents Of Display
Group, channel, frequency, battery level, antenna A/
B, muting level, AF indication, RF indication, channel
scanning, output level attenuation, volume indication
Control Functions
Power, group, channel, frequency, muting level, button
lock, volume, output attenuation (XLR), scan ,Mix
Output
Audio Frequency Output Level(MAX) Ø6.3 Phone Jack：+4dBu
XLR Jack：+10dBu(Line)、-10dBu(MIC)
Audio Frequency Output Impedance 600Ω
Muting Noise muting and tone code locking
Output Port 2 x balanced XLR jack
2 x unbalanced Ø6.3 jack
Power Supply 100~240VAC
Dimension (Mm) 485mm (W) x45mm (H) x 260mm (L)

WIRELESS MICROPHONE SYSTEM
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3-2 UHF PLL hand-held transmitter //
Frequency oscillation Phase-locked loop, PLL
Carrier frequency 470~608MHz
Bandwidth 36MHz
Paring RF Remoset
RF power output Low / High
RF stability <±10KHz＠Fc
Modulation frequency
deviation ±48KHz
Spurious Emissions <-50dBc
LCD display
Group, channels, frequency, mute, input level
attenuation, sensitivity adjustment, power
indication, Device ID
Controls
Power, mute, groups, channels, frequency,
sensitivity adjustment, input level attenuation,
transmission power, key lock
Battery AA Alkaline battery x 2
Charging Yes
Dimension 265mm L x 51.2mm W x 51.2mm H
Remark Specifications provided above may be slightly
different from the product without further notice.

4
4. Description of parts
4-1 UHF PLL Dual-channel diversity receiver( True Diversity ) // RU-901Du
Front panel
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6
7
8
1
4
2
3
Power ON/OFF:
ON：push once to turn on.
OFF：push and hold until ''Power OFF'' is shown on the LCD to turn o.
EXIT: Push exit to cancel a selection or exit from the current menu when RU-
901Du is in the ''setting menu.''
Rotary Switch: when in the ''function menu,'' turn the switch to select the
desired function; push the switch (or SETUP) to enter the selection and spin the
switch to select the setting. Push [SETUP] to save the setting.
SETUP: Push and hold for 2 seconds to enter the“setting menu.” Push SETUP to
save the setting once the selection and setting are made according to
''3. Rotary Switch.''
RF : this allows user to synchronize the transmitter after modifying a
parameter. Push “ ” to synchronize the settings to the transmitter.
Remoset indicator: this shows the current pairing status. It ashes rapidly
when data is being transmitted and the ashing stops when the synchronization
is completed. However, the ashing slows down if synchronization fails after a
period of time of pairing attempt.
LCD display: See ''Receiver LCD display instructions.''
AF: indicates the current strength of audio frequency signals.
RF: indicates the current strength of radio frequency signals.
Key lock: push and hold for 2 seconds to lock all keys, and again to unlock.
Volume keys: push▲/▼keys to adjust the volume between 0 and -31dB.
Selection key: push this button
a. Push SETUP to enter the setting for the selected channel for parameter
settings.
b. Push REMOSET to transmit the setting data to the transmitter in this
selected channel.
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10
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12

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Front panel
Rear panel
Rear panel
3 3
5 5
7 78 8
2
46
1
Power : AC power 100~240VAC
AC power outlet(for cascading): it allows power connection to next receiver
with an extension AC power cable.
XLR audio jack: balanced audio signal output
XLR audio jack: balanced audio signal output after mixing
Ø6.3 audio output jack: unbalanced audio signal output
Ø6.3 audio output jack: unbalanced audio signal output after mixing
RF A (or B) Out: RF signal output socket(for cascading): Provide RF signal to next
receiver.
Antenna A (B) input terminal: BNC antenna input jack that also provides
DC12V/100mA output.
1
2
3
4
5
6
7
8
R -901Du
EXITSETUP
2 Channel Receiver
PUSH / CONTROL
SEL. SEL.
CH1 CH2
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7
5
923
10
12
611
8

6
2
11
10
7
3
65
4
89
3
4
6
7
2
5
1:Antenna Selection A/B. The Receiver is mute.
: Transmitter Battery Level
:Frequency (Group/Channel)
: Frequency
: Key Lock (Key Lock ON)
: Volume
: Output attenuation ON
Content Displayed under the Non-Setting Mode:
8
9
10
Setup Menu
RX1: Set the Receiver's Channel 1. RX2: Set the Receiver's Channel 2.
1: Set the Receiver's Channel 1. 2: Set the Receiver's Channel 2.
520.325

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Power ON/OFF：push once to turn on. Push and hold for 2 seconds while
the power is on to turn off. While the power is on, a quick push of this
button will show the Device ID on the LCD display.
Mute：switch up to talk and down to mute while the power is on. If the
power is off, switching up from mute will turn the microphone on.
Battery compartment：it holds 2 UM3, AA 1.5V Alkaline batteries or MiNH
rechargeable batteries.
LED indicator：it shows the microphone's status, including battery power,
mute and pairing.
LCD display：it shows the parameter settings of transmitter.
SET：for parameter settings, including frequency, group, channel,
sensitivity, transmission frequency, auto off time, Device ID ,
function (ON/OFF).
Up/down selection keys：they are used with ''SET'' to change parameter
settings. Before entering the setting mode, a quick push will show the De-
vice ID on the LCD display.
LOCK ：push and hold ''LOCK'' for 2 seconds to lock and again to unlock.
Under ''LOCK'' status MUTE function is still valid.
Charging contact module: if rechargeable batteries are used, charging is
possible with the matching charger.
4-2 UHF PLL handheld transmitter //
1
42
3
9
5
6
7
8
1
4
2
3
9
5
6
7
8

8
RF output power (Low / High)
Battery level
Key lock
Frequency (MHz)
Indication of frequency, group and channel
LCD displays
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11
12
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13
12
14
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4-3 Accessories
1
3
2
5
4
5
6
6
7
7
AC power cable * 1
BNC/BNC RF extension cable for cascading * 2
Extension AC power cable for series connection * 1
XLR(M)/XLR(F) Audio cable * 2
Antenna * 2
GC-80/GC-100 Guitar Cable
GC-80L/GC-100L Guitar Cable
Option
Option
1
34
SELF-MA N
SM-018
SELF-MA N
SM-006
2

10
5. Preparing Procedures
5-1 How to connect the receiver// RU-901Du
1.1RU-901Du：
(1) The XLR output jack or 6.3mm unbalance output jack can be selected
individually to connect the AF output to a mixer or amplier for volume
control.
(2) Switch the“Mixed” on the back to ON. This allows to mix the RX1 and RX2
signals to RX1’s 6.3mm non-balance output jack and then to a mixer or
amplier for volume control.
1. Connect the audio output of receiver to mixer or amplier
2.1. Connect to AC outlet:
One end connects to receiver“power input”, while the other end connects
to AC power receptacle.
2.2. Set the parameters:
Turn the power on and set the parameters of receiver according to the
setting instructions.
Caution! Secure the power cable on the fastening hook of anti-pulling clip in
order to prevent the power cable from falling.
2. Connect to power
Step1
Step 2
AC transformer
Power receptacle
Power supply
Step2
Step1

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3. Cascading of AC power cable and antenna
Power socket
More RU-901Dus…
5 units
It is allowed to cascade power and antennas for 5 units.

12
The mute switch of handheld transmitter also serves to turn the power on.
Therefore, the power will come on when the batteries are replaced. Place the
mute switch at mute if you do not want to turn the power on immediately
after battery replaced.
1.Unscrew the outer tube of the transmitter.(Figure1)
2.Place 2 AA batteries in the battery compartment according to their
polarity.(Figure 2)
3. Screw the outer tube back on.(Figure 3)
4. To turn the transmitter on:
a. Push Power ON/OFF to turn on. (Figure 4a)
b. Or, turn the power on by switching the MUTE switch up.(Figure 4b)
5. Define the transmitter parameters according to the instructions.
Figure 1 Figure 2 Figure 3 Figure 4a Figure4b
5-2 Installing transmitter //

WIRELESS MICROPHONE SYSTEM
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6. Instructions for use
6-1 How to use // RU-901Du
Press and hold the SETUP key for 2 seconds to enter the
Setup Menu. Trun the Rotary Switch to select the item to
be set, and press SETUP again to enter the settings.
※Press EXIT to return to the previous item. Note that
the set value will not be saved.
◎Frequency Setting
Adjust the left 3 digits of the Frequency. Trun the Rotary
Switch to change by "+/-" 1 MHz each time. Press the
SETUP key after adjustment is completed. Adjust the
right 3 digits of the Frequency. Trun the Rotary Switch
to change by“+/-” 0.025MHz each time. After the setup
is completed, press the SETUP key to save the set value.
◎Default Group
Trun the Rotary Switch to select Group "G:" ; Press the
SETUP key adjustment is completed. Trun the Rotary
Switch to adjust Channel "CH:" After adjustment is com-
pleted, press the SETUP key to save the set value.
◎The Scanning Function
Scan All Groups. Press the SETUP key to start scan-
ning. After the scan is completed, the “Scan Results
List” screen will be displayed automatically. Users can
also click on the menu to enter the“Scan Results List”
directly.

14
Rotate the Rotary switch to the right to search for the
next available Channel. Press the SETUP key to save the
settings.
◎Receiver Sensitivity
+10 ~ -5: The higher the value, the lower the Receiver
Sensitivity; the lower the value, the higher the Receiver
Sensitivity. Default Value is 0.
◎Output Attenuation
Rotate the Rotary switch to the right to set the bal-
anced output level for Line to Line output.
Rotate the Rotary switch to the left to set the balanced
output level for Mic to
Mic output.
“Scan Results List”: Press the SETUP key to enter the
menu screen and view the scan results. Select the
available channels, and press the SETUP key to save the
settings.
Scanning the current Group: Upon entry into the
screen, trun the Rotary Switch to select the group to be
scanned, and press SETUP to start scanning. Press ▲to
search for the previous available Channel.

WIRELESS MICROPHONE SYSTEM
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◎Microphone Options: Trun the Rotary Switch to select
the item to be adjusted. Press SETUP, and then trun the
Rotary Switch to select the settings to be adjusted, and
then press SETUP to return to the item selection.
Sensitivity
Scope of Adjustment:
-15dB~+15dB；Default Value is 0.
Input Attenuation
ON Audio input is attenuated by 20dB. (Depend-
ing on whether the transmitter has this
function)
OFF Not Attenuated (Default Value)
This function only applies to the Waist-Mounted Trans-
mitter RU-G3TB.
Radio Frequency Power
High High Transmitting Power 50mW
Low Low Transmitting Power 10mW(Default Value)

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Synchronization Options
Trun the Rotary Switch to select and
synchronize transmission of the setup items, and then
press the SETUP key to perform the selection action.
□Frequency
□Sensitivity
□Attenuate
□RF Power
□Auto OFF
□Key Lock
Save and Exit
Exit Without Save
◎Key Lock
ON Key Pad Lock ON
OFF Key Pad Lock OFF
◎System Settings
Automatic shutdown (when the Microphone is muted)
OFF This function is turned o.
1 min Automatic shutdown after 1 minute
10min Automatic shutdown after 10 minutes
30min Automatic shutdown after 30 minutes

WIRELESS MICROPHONE SYSTEM
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◎Display Settings
Contrast 0~7 (Default Value4)
Brightness 0~7 (Default Value4)
◎Mixed Output
ON Mixed Output Enable
OFF Mixed Output Disable
Mix the signal with RX1 and RX2 then output together from RX2
◎Reset to original manufacturer settings
◎Exit the Setup Screen.
Press the SETUP key to exit the setup screen and return
to the home screen.
◎Device ID
Device ID: 0~255: this setting affects the use of REMOSET;
both the receiver and transmitter must be on the same
Device ID before REMOSET is available.
Note: this does not apply when the
microphone Device ID is not activated.