Amplitec C20M-5B Series User manual

PLEASE KEEP APPROPRIATELY AND CAREFULLY READ THIS USER MANUAL BEFORE
INSTALLATION
PLEASE KEEP APPROPRIATELY AND CAREFULLY READ THIS USER MANUAL BEFORE INSTALLATION
C20M-5B Signal Repeater
User Manual

The power supply voltage of repeater
should meet the standards of
security requirements
Ensure of grounding, waterproof and
lightning protection when installing
the repeater
The repeater should be installed and
started by professionals
Do not open the repeater, maintain
or replace the components
Keep the repeater away from heat
source, do not install in a narrow
space
Content
PACKAGE CONTENTS................................................................................................... 1
PRODUCT DESCRIPTION..............................................................................................1
PRODUCT FEATURES....................................................................................................1
CONNECTOR DESCRIPTION........................................................................................2
OPERATION AND DISPLAY DESCRIPTION..............................................................3
TECHNICAL SPECIFICATION....................................................................................... 6
INSTALLATION GUIDES.................................................................................................7
Installation Requirements................................................................................................................7
Installation Tools................................................................................................................................ 7
Installation Steps................................................................................................................................7
Antenna Connection..........................................................................................................................8
Starting..................................................................................................................................................9
MAINTENANCE AND REPAIRING............................................................................... 9
Frequently Ask Questions and Solutions....................................................................................9
Notes................................................................................................................................................... 10

C20M-5B Five Band Signal Repeater
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Package Contents
C20M signal repeater, 1pc 12V3A power adapter Installation screws
Product Description
C20M series five band repeater is a mobile signal repeater with high intelligence. It adopts
digital ALC and anti-interference technology, which can detect the signal quality in the
coverage area in real time and auto adjust the working status accordingly.
The signal repeater can automatically attenuate the gain of uplink and downlink, according
to the detected signal intensity and also when there is insufficient isolation between inside and
outside antenna, to avoid self-oscillation. When there is no mobile users in the coverage area,
the device will auto shut off uplink, to save power consumption and decrease the interference
to the base station.
This signal repeater series are well suited in South America and Europe, available to
amplify 2G 3G 4G or 5G networks of several mobile operators. With features like elegant
appearance, compact size and easy to install and maintain, it has an output power of 20dBm
which enables the device to cover an area of up to 500 ㎡with proper installation. That makes
it an excellent option to solve weak signal problems of house, office, elevator, basement, etc.
Product Features
LCD screen to display device’s operating parameters clearly, button control make it
easier to operate the device；
Available to support several mobile operators’ networks simultaneously；
Low power consumption, low interference；
Manual gain control, with 1dB step to attenuate the gain among the range of 31dB；
Digital ALC technology, auto limit the output power to ensure stable signal coverage；
Anti-interference technology, auto detect the isolation in real time. When isolation is

C20M-5B Five Signal Repeater
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insufficient, device will auto attenuate the gain, to avoid self-oscillation occurs to
interfere the base station；
Uplink dormant function, when no mobile users in the coverage area, device will shut
off uplink output, to save power consumption and not interfere the base station.
Connector Description
A：Outside antenna connection port(N-female)
A
E
H
G
F
K
B
C
D
J
I

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B：Inside antenna connection port(N-female)
C：12V DC power connection port
D：Power switch
E：Grounding screws
F：LCD display screen
G：Menu Button
H：Select and confirm button
I：Value increase button
J：Value decrease button
K：Working status indicator
Operation and Display Description
a. Function Buttons on the Control Panel
MENU ：Main Menu
SET：To select and confirm the operation
INC+：To increase the value
DEC-：To decline the value
b. Screen Display and Screen lock
After power-on and starting running, the main menu interface of the display screen
shows the corresponding downlink frequency and gain of the working frequency band and
the downlink input and output power (Figure 1) (the following operation instructions are for
reference only, the specific frequency and gain are subject to the device) ；Long press
"MENU" for 5 seconds + press "INC+" key to enter the lock screen (Figure 2),
single-pressing the key is invalid. The device is working normally but the display screen
does not display, then long press "MENU" for 5 seconds + press "INC+" key after unlocking
the screen, you can operate and display normally after unlocking the screen (Figure 1).

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Figure 1 Figure 2
c. Gain Attenuation Setting
Press “MENU” and select the band needed to adjust ；Press“SET” 3 seconds
until“Gain:DLxxdB”flashing(Figure 3) ，Press “SET” once more to specific setting of the
uplink or downlink , then press “INC+” or “DEC-” to attenuate the gain(Figure 4 and 5).
When the setting is finished and press “MENU” button to return to homepage.
Figure 3 Figure 4 Figure 5
d. Uplink Auto shut-off function
When there is no active users in the coverage area, the uplink will shut-off
automatically.“Run” flashing(Figure 6).
Figure 6

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e. Check real-time gain and power
Press the ‘MENU’ button to view the real-time gain (Gain) and input (Rssi) output
power of the corresponding system(Figure 7).
Figure 7
f. Self-oscillation Elimination and Auto Shutoff Function
The device will auto detect the isolation in real time. When there is insufficient isolation
between outside and inside antenna, the device will auto attenuate the gain to make it work
normally(Figure 8,the “run” indicator is in orange ). When severe insufficient isolation
occurs, the “run” indicator is in RED (Figure 9). Then the device will be turned off, the
direction and height of the antennas should be adjusted until there is sufficient isolation for
device’s normal working.
Figure 8 Figure 9

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Technical Specification
Model
Uplink (MHz)
Downlink (MHz)
C20M-5B1
703~748/824~849/1710~1785/1920~1980/2500~2570
758~803/869~894/1805~1880/2110~2170/2620~2690
C20M-5B2
703~748/824~849/1710~1755/1850~1910/2500~2570
758~803/869~894/2110~2155/1930~1990/2620~2690
C20M-5B3
832~862/880~915/1710~1785/1920~1980/2500~2570
791~821/925~960/1805~1880/2110~2170/2620~2690
C20M-5B4
703~748/880~915/1710~1785/1920~1980/2500~2570
758~803/925~960/1805~1880/2110~2170/2620~2690
Item
Uplink
Downlink
Gain
70±2 dB
75±2 dB
VSWR
≤2
≤2
Output Power
15 ± 2 dBm
20 ± 2 dBm
ALC Active 10 dB
∣△∣≤2 dB
∣△∣≤2 dB
Max. Input Power Without Damage
-10 dBm
-10 dBm
Intermediation
Products(CW)
9 KHz~1 GHz
≤-36 dBm
≤-40 dBc
1 GHz~12.75 GHz
≤-30 dBm
≤-40 dBc
Spurious Emission
9 KHz~1 GHz
≤-36 dBm
≤-36 dBm
1 GHz~12.75 GHz
≤-30 dBm
≤-30 dBm
ATT step of 1 dB
1 ~ 10 dB
∣△∣≤1 dB
∣△∣≤1 dB
10 ~ 20 dB
∣△∣≤1.5 dB
∣△∣≤1.5 dB
20 ~ 31 dB
∣△∣≤2 dB
∣△∣≤2 dB
Noise Figure@ max. gain
≤8 dB
≤8 dB
ACRR
5 MHz
≥ 20 dB
≥ 20 dB
10 MHz
≥ 20 dB
≥ 20 dB
EVM
≤ 8 %
≤ 8 %
Time Delay
≤1.5 μs
≤1.5 μs
RUN LED Indication
Normal
Green
Uplink idle
shutdown (Mute)
Green Flash
ISO derating work
Orange
Stopped
Red
Alarm LED Indication
Not Active
—
Green
Active 5~10 dB
—
Orange
Active15~25 dB
—
Red
SET Button
Select and Confirm
INC+ Button
Increase the value with 1dB step
DEC- Button
decrease the value with 1dB step
LCD Indication
Band
Display Working Band and Frequency
Gain
Display of UL&DL Gain
Pout
Display DL output power
Work
Working normally: display,
Uplink idle shutdown : no display
ISO
Working normally: no display;
Auto degrading system gain: display;
Self-oscillation Turn-off: display&flashing
ALC
Not active: no display;
Active@5-10dB: display;
Active@15-29dB: display&flashing

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Item
Uplink
Downlink
Auto shut-off Functions
Uplink stand-by
Available
Self-oscillation
shutdown
Available
Over input turn-off
Function
Available
Over-heat protection
Available
Self-oscillation Elimination
Available
Link Balance Function
Available
Auto screen lights off
No operation within 3 minutes
Power Supply
DC: 12 V
Power Consumption
< 45 W
RF Connector
N-Female
Impedance
50 ohm
Environment Conditions
IP 40
Humidity
< 90 %
Operating Temperature
0℃~ +50℃
Installation Guides
Installation Requirements
1) With stable and independent power supply.
2) No corrosive gas, smoke or liquid leakage.
3) Sun block and cool for device’s safe running.
4) Easy for cabling and dissipation, safe and easy for maintenance.
5) Waterproof and under thunder protection.
Installation Tools
No.
Items
Quantity
Remarks
1
Percussion drill
1
Drill holes on wall, self-provided
2
Wrench
1
Reinforce the interface connection, self-provided
3
Mobile phone
for testing
1
Test installation effectiveness, self-provided
4
Multimeter
1
Test voltage and wiring connection, self-provided
5
Screwdriver
1
Tighten or fasten the device, self-provided
6
Waterproof tape
A few
Prevent liquid from leaking into the feeder
interface, self-provided
Installation Steps
The repeater should be installed on a solid and hard plane. The installation steps are as
follows:
1) Find a suitable site according to the installation requirements and dimension of repeater.
2) Drill 4 holes with the percussion drill according to the installation holes. Sizes are 7mm.
The expected sites of the holes are as the following diagram.

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3) Put the expansion pipes(size: 8mm) into the 4 drilled holes.
4) Align the fixing holes of the repeater with corresponding holes on the wall, and drive 4
M6*40 screws into the expansion plugs with screwdriver and fasten the repeater firmly.
Antenna Connection
Take suitable outside antenna and inside antenna according to the characteristic of the

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coverage area. Installation and connection of the antennas should follow the requirements as
following:
1）The outside antenna should be installed at the place with the strongest signal and
towards BTS.
2）The length of the cable, which connects the outside antenna and the repeater, should
be less than 20 meters.
3）Wrap the waterproof tape around the connection part of the outside antenna and
outdoor cable, in case of oxidization or corrosion.
4）The indoor antenna should be placed 5m above lower than the outside antenna, with
its direction not towards the outside antenna.
5）It will be better if there can be a wall between outside and inside antennas.
6）Outside antenna should connect to BTS port of the repeater while inside antenna to
the MS port.
Starting
1）If possible, please connect the grounding screws of the repeater and grounding of the
electrified wire with cable.
2）Make sure the feeder cables between repeater and antennas are firmly connected.
3）Connect the DC plug of the 12V/3A power adapter to the DC+12V port of the repeater.
Then put AC plug connecting to the nearby 220V power outlet.
4）Check if repeater can work normally or not, by checking the operation parameters on
the screen, according to the guides of the previous “Operation and Display Description” part.
5） Test signal intensity and dialing quality with mobile phone in the repeater coverage area.
Maintenance and Repairing
Frequently Ask Questions and Solutions
Problems
Reasonable Causes
Solutions
Screen and indicator
lights are off
Disconnected to power source
Check the power adapter and
power outlet, and reconnect it
“Run” Indicator Red
Isolation between outside antenna
and inside antenna is insufficient
Change the distance & direction
of outside & inside antenna, until
I.S.O is not flashing

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Everything is okay
after power-on, but
no improvement in
signal
The network of SIM card does not
comply with that of signal repeater
Replace SIM card or repeater
The inside antenna is not
successfully connected
Fasten the connection of inside
cable and connectors
The inside antenna is damaged
Replace the inside antenna
Effectiveness of the
repeater degrades
after working for a
while
The outdoor antenna is damaged
Replace the outside antenna
The outside antenna get loose
and is not towards the BTS
Change the direction of outside
antenna and fasten it
Feeder is damaged
Replace the feeder
Notes
Power-off is recommended in the following situations.
Power supply is abnormal.
Liquid flows into the device or too close to the fire.
Working conditions are abnormal such as overheating, strange smell or foreign matters.

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Manufacturer: Guangdong Amplitec Tech Development Co.,Ltd
Address: 4th Floor, 4th Building, No. 60 of Langbao West Rd, Zhangcha Foshan, China, 528000
Tel：[phone]，Fax：[phone]
Email：[email protected], Website：www.amplitec.net