EP20M-5B Series

Cell Signal Amplifier

User Manual

PLEASE KEEP APPROPRIATELY AND CAREFULLY READ THIS USER MANUAL BEFORE
INSTALLATION

PLEASE KEEP APPROPRIATELY AND CAREFULLY READ THIS USER MANUAL BEFORE INSTALLATION
EP20M-5B Five Band Signal Amplifier

The power supply voltage of repeater Ensure of grounding, waterproof and

should meet the standards of lightning protection when installing
security requirements the repeater

The repeater should be installed and Do not open the repeater, maintain
started by professionals 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 ............................................................................... 5
INSTALLATION GUIDES ....................................................................................... 7
Installation Requirements ............................................................................................. 7

Installation Tools .......................................................................................................... 7

Installation Steps .......................................................................................................... 7

Antenna Connection ..................................................................................................... 9

Starting ......................................................................................................................... 9

MAINTENANCE AND REPAIRING ........................................................................ 9

Frequently Ask Questions and Solutions ..................................................................... 9

Notes .......................................................................................................................... 10
EP20M-5B Five Band Signal Amplifier

Package Contents The KIT includes Additional

AC Adapter
Outdoor Antenna Indoor Antenna

Amplifier

Installation Screws
2 Coax jumpers; 15 m Antenna Mount
Product Description and 5 m
EP20M5B 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 Central and South America, 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 1200 ㎡ 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
insufficient, device will auto attenuate the gain, to avoid self-oscillation occurs to

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EP20M-5B Five Band Signal Amplifier

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

E A C D B

J I H G K F
 A ： Outside antenna connection port (N-female)
 B ： Inside antenna connection port (N-female)
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EP20M-5B Five Band Signal Amplifier

 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).

Figure 1 Figure 2
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EP20M-5B Five Band Signal Amplifier

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

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).

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EP20M-5B Five Band Signal Amplifier

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

Technical Specification

Model Uplink (MHz) Downlink (MHz)

EP20M5B 703~748/824~849/1710~1780/1850~1915/2500~2570 758~803/869~894/2110~2180/1930~1995/2620~2690

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EP20M-5B Five Band Signal Amplifier

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 9 KHz~1 GHz ≤-36 dBm ≤-40 dBc
Products(CW) 1 GHz~12.75 GHz ≤-30 dBm ≤-40 dBc
9 KHz~1 GHz ≤-36 dBm ≤-36 dBm
Spurious Emission
1 GHz~12.75 GHz ≤-30 dBm ≤-30 dBm
1 ~ 10 dB ∣ △∣ ≤1 dB ∣ △∣ ≤1 dB
ATT step of 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
5 MHz ≥ 20 dB ≥ 20 dB
ACRR
10 MHz ≥ 20 dB ≥ 20 dB
EVM ≤8% ≤8%
Time Delay ≤1.5 μs ≤1.5 μs
Normal Green
Uplink idle
Green Flash
RUN LED Indication shutdown (Mute)
ISO derating work Orange
Stopped Red
Not Active — Green
Alarm LED Indication 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
Band Display Working Band and Frequency
Gain Display of UL&DL Gain
Pout Display DL output power
Working normally: display,
Work
Uplink idle shutdown : no display
LCD Indication
Working normally: no display;
ISO Auto degrading system gain: display;
Self-oscillation Turn-off: display&flashing
Not active: no display;
ALC Active@5-10dB: display;
Active@15-29dB: display&flashing
Uplink stand-by Available
Self-oscillation
Available
shutdown
Auto shut-off Functions Over input turn-off
Available
Function
Over-heat protection Available
Self-oscillation Elimination Available
Link Balance Function Available
Auto screen lights off No operation within 3 minutes

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EP20M-5B Five Band Signal Amplifier

Item Uplink Downlink

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
Mobile phone
3 1 Test installation effectiveness, self-provided
for testing
4 Multimeter 1 Test voltage and wiring connection, self-provided
5 Screwdriver 1 Tighten or fasten the device, self-provided
Prevent liquid from leaking into the feeder
6 Waterproof tape A few
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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EP20M-5B Five Band Signal Amplifier

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.

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EP20M-5B Five Band Signal Amplifier

Antenna Connection
Take suitable outside antenna and inside antenna according to the characteristic of the
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 120/220V 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 Check the power adapter and

Disconnected to power source
lights are off power outlet, and reconnect it

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EP20M-5B Five Band Signal Amplifier

Change the distance & direction

Isolation between outside antenna
“Run” Indicator Red of outside & inside antenna, until
and inside antenna is insufficient
I.S.O is not flashing

The network of SIM card does not

Replace SIM card or repeater
Everything is okay comply with that of signal repeater
after power-on, but
no improvement in The inside antenna is not Fasten the connection of inside
signal successfully connected cable and connectors

The inside antenna is damaged Replace the inside antenna

The outdoor antenna is damaged Replace the outside antenna

Effectiveness of the
repeater degrades The outside antenna get loose Change the direction of outside
after working for a and is not towards the BTS antenna and fasten it
while
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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