Amplitec C20L Series User manual

PLEASE KEEP APPROPRIATELY AND CAREFULLY READ THIS USER MANUAL BEFORE INSTALLATION
C20L Series Signal Booster
User Manual

1
Contents
PACKAGE CONTENT.................................................................................................................... 2
PRODUCT DESCRIPTION............................................................................................................. 2
PRODUCT FEATURES................................................................................................................... 2
CONNECTOR DESCRIPTION.........................................................................................................3
OPERATION AND DISPLAY DESCRIPTION.................................................................................. 4
TECHNICAL SPECIFICATION.........................................................................................................6
INSTALLATION GUIDE................................................................................................................. 8
Installation Requirements..............................................................................................................................8
Installation Tools............................................................................................................................................ 8
Installation Steps............................................................................................................................................8
Antenna Connections.....................................................................................................................................9
Starting......................................................................................................................................................... 10
MAINTENANCE AND REPAIRING..............................................................................................10
Common Problems and Solutions............................................................................................................... 10
Notes............................................................................................................................................................ 11

C20L Signal Booster
2
Package Content
C20L Signal Booster 5V 2A Power Adapter Installation Screws U-shaped Back Holder
Product Description
C20L series signal booster is highly intelligent. It is designed with digital ALC function,
anti-interference function, and auto-adjustment function, to detect the real-time signal quality of the
coverage area and adjust working status accordingly. The booster can automatically adjust the gain of
uplink and downlink to maintain link balance, according to the intensity of receiving signal. When the
isolation between outdoor antenna and indoor antenna is not enough, it will automatically decline the
gain, to make the isolation enough to eliminate self-excitation. When there is no user in the coverage
area, the booster will automatically shut down uplink signal output, to save power consumption and
reduce the interference to BTS.
This C20L series signal booster, with features like novel appearance, succinct structure, easy
installation and maintenance and supporting different frequencies with multiple models, is a perfect and
optimal signal solution for coverage of houses, offices, elevators and basements, etc.
Product Features
Clearly show the status of device with display screen. Button operation makes it easier and
more convenient to control
Support amplifying multiple operators’ network simultaneously
Low power consumption, low interference
Digital ALC technology, ALC could automatically limit the output power to ensure stable
signal coverage
Anti-interference technology, automatically detect isolation and eliminate self-excitation, to
avoid interference to the BTS
Manual gain attenuation, with 1dB step to attenuate the gain among 1-31dB range.

3
Connector Description
A：Connect to outdoor antenna (N-Female)
B：Connect to indoor antenna (N-Female)
C：DC 5V power connector
D：Grounding screws
E：Up arrow
F：Down arrow
G：Confirm key
H：Display screen
I：Alarm indicator light
J：Working indicator light
A
E
H
I
J
F
G
B
C
D

C20L Signal Booster
4
Operation and Display Description
a. Function of control panel
INC+：Move downward
DEC-：Move upward
SET：Set up or confirm
b. Screen Display
After power-on and start running, the screen of the device will display working frequency on the
main menu, scrolling display the gain of uplink and downlink, output power of downlink, ISO and ALC
alarm.
Pic 1 Pic 2
c. View the Output Power
Press “SET”key and “Pout” on the screen will be light up , and real-time downlink output power
will be displayed on the right side.
d. View the Gain and Gain Attenuation Set-up
Press “SET” key, “Gain UL” on the screen will light up and uplink gain will be displayed on the
right side (as shown in Pic 3).
Then press “INC+” or “DEC-” key to adjust uplink gain(as shown in Pic 4). Press “SET” key,
“Gain DL”on the screen will light up and downlink gain will be displayed on the right side(as shown in
Pic 5). Then press “INC+” or “DEC-” key to adjust uplink gain(as shown in Pic 6).
Pic 3 Pic 4

5
Pic 5 Pic 6
e. Uplink Auto Shut Down Function
When uplink input power is lower than -85dB(there is no phone being used in the coverage area),
uplink signal output will be automatically shut down. And the “Work”on the left bottom will light off
and LED indicator “RUN” will be flashing(as shown in Pic 7).
Pic 7
f. ISO Self-excitation Elimination and Auto Shut Down
The device will detect isolation in real time. And when the isolation between outdoor antenna and
indoor antenna is not enough, the “I.S.O” on the middle bottom will light up and device will
automatically adjust gain to make it work normally. When severe self-excitation occurs(the isolation
between outdoor antenna and indoor antenna is lower than gain value, more than 15dB), signal output
will automatically be shut down, in case the self-excitation causes interference to the BTS. Meanwhile,
“I.S.O” on the middle bottom of the screen will be flashing.
Pic 8 Pic 9

C20L Signal Booster
6
Technical Specification
Items
Uplink
Downlink
Frequency Range
C20L-CDMA
824 ~ 849 MHz
869 ~ 894 MHz
C20L-(E)GSM
（880）890 ~ 915 MHz
（925）935 ~ 960 MHz
C20L-DCS
1710 ~ 1785 MHz
1805 ~ 1880 MHz
C20L-WCDMA
1920 ~ 1980 MHz
2110 ~ 2170 MHz
C20L-LTE7
2500 ~ 2570 MHz
2620 ~ 2690 MHz
C20L-LTE20
832 ~ 862 MHz
791 ~ 821 MHz
C20L-LTE28(A)
703 ~ 733 MHz
758 ~ 788 MHz
C20L-LTE28(B)
718~748 MHz
773 ~ 803 MHz
Gain
65±3 dB
70±3 dB
Ripple in Band
CDMA≤8 dB /EGSM≤15 dB / GSM≤8 dB / DCS≤10 dB / WCDMA≤6 dB /
LTE7≤8 dB / LTE20≤15 dB / LTE28≤8 dB
VSWR
≤2.0
≤2.0
Output Power
15±2 dBm
20±2 dBm
ALC Range
∣△∣≤2 dB
∣△∣≤2 dB
Max. Input Power Without Damage
0 dBm
0 dBm
Intermodulation Products(CW)
≤-40 dBc
≤-40 dBc
Spurious Emission
9KHz~1GHz
≤-36 dBm
≤-36 dBm
1GHz~12.75GHz
≤-30 dBm
≤-30 dBm
ATT
1 ~ 10 dB
∣△∣≤1 dB
∣△∣≤1 dB
10 ~ 20 dB
∣△∣≤1.5 dB
∣△∣≤1.5 dB
20 ~ 25 dB
∣△∣≤2 dB
∣△∣≤2 dB
Noise Figure
≤8 dB
≤8 dB
PCDE（W）
≤ -35dB
≤ -35dB
ACRR(W)
5MHz
≥ 20dB
≥ 20dB
10MHz
≥ 20dB
≥ 20dB
EVM
≤ 8~12.5%
≤ 8~12.5%
Time Delay
≤1.5 μs
≤1.5 μs
RUN Indicators
Normal Working
ON & Green
Uplink Auto Shut Down
Flashing green
ISO Derating
Orange
Stop Running
Red
Alarm Indicators
Not Active
—
Green
Active 5~10 dB
—
Orange
Active 15~25 dB
—
Red
SET key
Confirm setting and selection
INC+ key
Move downward, with step of 1dB to increase
DEC- key
Move upward, with step of 1dB to decrease

7
Items
Uplink
Downlink
LCD Indicators
Band
Display working frequency
Gain
Display gain of uplink and downlink
Pout
Display downlink output power
Work
Normal working: light up; Uplink shut down: light off
ISO
Normal working: light off; Derating: light up; Auto shut
down for self-excitation: light up and flash
ALC
Not active: light off; Active 5-10dB: light up; Active
15-29dB: light up and flash
LCD control
Gain
Idle Shutdown
@Max. Gain, input uplink signal keep lower than -85dBm(idle threshold value) for
more than 5 minutes, uplink PA OFF. When input uplink signal is more than -80dBm,
uplink PA will auto be ON immediately.
Real-time
Self-excitation
Elimination
When test the downlink and find it self-excited(isolation is lower than gain value),
device will derate power; when it is severe self-excitated(isolation is 15dB lower than
gain value or more), device will be auto shut down.
Auto Shut Down
When severe self-excitation occurs, it will be auto shut down(When isolation is
beyond ALC range, PA of uplink and downlink will be OFF. Device will be auto
restarted after 30±5s and will keep trying. If isolation is more than ALC range for 5
times, it will be permanently OFF until power-on again.
Power Supply
DC: 5V
Power Consumption
< 6 W
RF Connector
N-Female
IP Grade
IP40
Operating Humidity
< 90%
Operating Temperature
0℃~ +50℃

C20L Signal Booster
8
Installation Guide
Installation Requirements
1) Stable and independent power supply
2) No corrosive gas, smoke or liquid leakage
3) Sun block and good for heat dissipation
4) Easy for cabling, safe and easy for maintenance
5) Waterproof and under thunder protection
Installation Tools
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, size and dimension of the booster.
2) Estimate and mark the site of U-shaped back holder installation holes. Drill holes with the
percussion drill. Sizes are 7mm.
No.
Items
Quantity
Remarks
1
Percussion drill
1
Drill holes on wall, self-provided
2
Wrench
1
Reinforce the interface connection, self-provided
3
Expansion tubes, screws
4 for each
Fix the device on the wall, included in the package
4
Mobile phone for testing
1
Test installation effectiveness, self-provided
5
Multimeter
1
Test voltage and wiring connection, self-provided
6
Screwdriver
1
Tighten or fasten the device, self-provided
7
Waterproof tape
A lot
Prevent liquid from leaking into the feeder
interface, self-provided

9
3) Put the expansion pipes(size: 8mm) into the 4 drilled holes.
4) As shown in the figure, align the fixing holes of the U-shaped back holder with corresponding holes
on the wall, and drive 4 M6*40 screws into the expand plugs with screwdriver and fasten the repeater
firmly.
Antenna Connections
Select suitable outdoor antenna and indoor antenna, according to the characteristic of the coverage
area. Installation and connection of outdoor antenna and indoor antenna should follow the requirements
as following:
1）The outdoor antenna should be installed at the place with the strongest signal and towards
BTS.
2）The length of cable, which connect the outdoor antenna and the booster, should less than be 20
meters.
3）Wrap the waterproof tape around the connection between outdoor antenna and outdoor cable.
4）The indoor antenna should be 5m away from the outdoor antenna in height, and can’t towards
outdoor antenna.
5）It will be better if there can be a wall between outdoor and indoor antenna.
6）Outdoor antenna should connect to BTS port of the signal booster and indoor antenna to the
MS port

C20L Signal Booster
10
Starting
1）If it is possible, please connect the grounding screws of the booster and grounding of the
electrified wire with cable.
2）Make sure the cables between booster and antennas are firmly connected.
3） Connect the DC plug of the 5V/2A power adapter, provided by supplier with the DC+5V port of
the booster. And AC plug connects to the nearby 220V power outlet.
4） Check the signal booster can work normally or not, by checking the operation parameters on the
screen, according to the “Operation and Display Description”.
5）Make a test with a phone to test the signal intensity and dialing quality in the coverage area.
Maintenance and Repairing
Common Problems 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
I.S.O on the screen flashes
after power-on
Isolation between outside
antenna and inside antenna is not
enough
Change the distance and direction
of outside and inside antenna,
until I.S.O is not flashing
Everything is okay after
power-on, but no
improvement in signal
The network of sim card is not
comply with that of signal
booster
Replace sim card or booster
The inside antenna is not
successfully connected
Fasten the connection of inside
cable and connectors
The inside antenna is broken
Replace the inside antenna
Working effectiveness get
worse after working for a
while
The outside antenna is broken
Replace the outside antenna
The outside antenna get loose
and not towards BTS
Change the direction of outside
antenna and fasten it
Feeder is broken
Replace the feeder

11
Notes
Power-off is recommended in the following situations:
Power supply is abnormal.
Liquid flows into the device.
Working conditions are abnormal such as overheating, strange smell or foreign matters
Too close to the fire

Manufacturer: Foshan 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：[e-mail], Website：www.amplitec.net