RFtoo B20 System User manual

RF25DS-B20
USER MANUAL
Variable Band Repeater
B20 System

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QUICK START
Connection and Control Interface
Table 1. product description
Item Description
1 DC +5V: +5VDC external power supply.
2 BS: Donor antenna port, uplink and downlink signals to base station.
3 Alarm Indicator and LCD Control pannel
4 MS: Service antenna port, uplink and downlink signals to mobiles.
*The picture is only for reference, please make the object as the standard.
1
2
3
4

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Wall Mount Method
Fig.1 Installation Diagram
Fig.2 Wall mount method and mounting hole positions in millimeters
1. Use percussion drill to make four holes on the wall following the pattern in the
above diagram.
2. Push the wallboard anchors to the holes.
3. Hold the REPEATER and push against the wall. Align the 4 holes on the
REPEATER with the anchor holes.
4. Drive two screws into the holes on the top line. Do not fully tighten the screws.

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5. Drive the other screws into the two holes on the bottom line. Do not fully tighten
the screws.
6. Check REPEATER alignment and tighten the 4 screws one by one.
7. Ground the REPEATER properly to complete the installation.
Warning Message
Do NOT Turn ON the REPEATER until the BS and MS Ports are Connected
to Antenna or add load if no connected to Antenna.
Install the REPEATER Only in A Normal Indoor Environment.
The Dismantlement, Modification or Use of Any Object or Device to Alter or
Limit the Functionality, Permanently or Temporarily, of Any REPEATER
Structure Are Prohibited.
Place donna Antenna and service Antenna in reverse, and guarantee at least the horizontal
distance is 10 meters and vertical distance 3 meters.

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User Manual
Section 1 Product Description and List of
Features
25dBm Variable band repeater allow small to medium size indoor areas have
reliable radio communications for first responders and can change the bandwidth
between 0.1-30MHZ. Automatic gain control allows stable output power even when the
handheld is close to the repeater, which protects the donor site from interruption. The unit
is housed by a compact and light alumina casting enclosure.
The built-in external LCD accessible from the bottom of the enclosure allow the uplink
and down link gains, Output Powers, Alarms and so on be configured and optimized easily
on site without additional tool. Signal strength indicator helps find donor signal source and
set up the system in the field without additional equipment.
 Uplink/downlink frequency full range, or custom bands
 Built-in Saw filter provides high out of band rejection
 Built-in switches and signal strength indicator allow find donor signal source and
set up the system on site without additional equipment
 External 100-240VAC universal power supply
 Indoor wall mount
 Heatsink convection cooling and low power consumption
 Built-in ALC provides stable output power even when the handheld is close to the
repeater to minimize the interference to the donor site
Section 2 Parts Check List
Please make sure the following items are included in the box delivered to you. If any
item is missing, contact your sales representative.
Table.1 Parts check list
Item Quantity
The Repeater, 1

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External Power Adaptor 1
M4x25mm self-tapping Screw with M6 plastic anchor 4
Customer Manual* 1
* Factory may choose to ship the product along with a hardcopy of this manual, or make it
available electronically through website download or email.
Section 3 Before Installation
Please verify the uplink and downlink frequencies labeled on the equipment, ensure
they match with your PO and your system requirements. Please contact your sales
representative if you find any discrepancy.
Read this manual before installation.
Install the equipment only in a normal indoor environment.
The built-in signal strength indicator supports quick deployment without additional tool
and equipment. However, we highly recommend that if possible, always use spectrum
analyzer and other equipment to assist the installation. Ideally, donor signal strength should
have been measured prior to the installation and the link budget and coverage have been
calculated by certified RF system design engineer. BOM, test plan and other documents
must be in place prior to the installation.
Section 4 Safety Information and Regulations
 Do not dismantle the equipment.
 Do not add extra pressure to REPEATER enclosure or attach anything to the
surface.
 Use only the power adaptor supplied with the REPEATER, not any alternative.
 The unit is for normal indoor environment application. Do not install the
REPEATER in a strong electric, high-intensity magnetic, corrosive, moist,
excessive temperature and other harsh environments.
 Install the REPEATER in a place that is not accessible by kids and
unauthorized individuals.
 Install and ground the unit following local inbuilding and communication site
construction codes.
 It is your responsibility to ensure the use of REPEATER complies with FCC
and other regulations.
 Do not power on the REPEATER before BTS and MS ports are connected.

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 Section 5 System Diagram
 Fig.3 System Diagram
Section 6 Step by Step Installation Instruction
1. Find a proper indoor position where a good grounding path is available,
usually on a wall, and install the REPEATER following the steps given in the
QUICK START.
2. Follow the system design documents to locate the donor antenna ad service
antennas. The donor antenna and service antennas must have sufficient isolation,
and 90dB minimum is recommended to ensure the device is working normally.
Donor antenna is typically installed on the rooftop or outside wall with high elevation,
avoiding any obstacle and in line of sight with the base station antenna. The
positions and number of service antennas must be designed properly by a qualified
system design engineer with proper RF planning tool.
3. Route the feed lines from the donor antenna to the REPEATER and service
antennas to the REPEATER following the system design documents. Connect
the feed line to donor antenna, and feed line to service antenna. Waterproof
the connections. Do not connect the feedlines to the REPEATER.
4. Verify isolation between donor antenna and service antennas. If a network
analyzer is available, it is recommended to verify the isolation between the donor
antenna and service antenna by bypassing the REPEATER and testing the
transmission between the port of the feedline to donor antenna and the port of the
feedline to service antenna. Minimum of 90dB is preferred. If the isolation is less
than 85dB, report to your project manager and system design engineer. Relocate
the donor antenna, or service antenna might be necessary. If both options are not

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applicable, then the REPEATER gain needs to be adjusted to avoid self oscillation
which needs approval from the project manager and system design engineer, refer
to step 12.
©
Fig.4 Installation Procedure
5. Adjust the donor antenna orientation.
5.1. If spectrum analyzer or other equivalent RF signal strength
measurement equipment is available (Highly recommended):
5.1.1 Set the spectrum analyzer's frequency range, bandwidth and other
parameters.
5.1.2 Connect donor antenna to the input port of spectrum analyzer.
Completion
Test for call qulitity
Adjust the direction of donor antenna
Connect power supply adapter
Measure receiving signal strength form base stantion
Install donor antenna and route feed lines
Install BDA on a wall
Indentify an installation location
Check contents of package
Inspection

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5.1.3 Adjust donor antenna direction until -45dBm to -55dBm signal strength is
measured.
5.1.4 Connect the donor antenna port to the REPEATER ‘BTS’ port.
5.2. Install the donor antenna without spectrum analyzer:
In case spectrum analyzer or other equivalent RF signal strength
measurement equipment is not available, the “Alarm” indicator on the front
panel can be used to adjust the donor antenna direction. When signal
strength received from the donor antenna is lower than-48dBm, the indicator
is green; when the received signal strength is higher than -35dBm, the
indicator is red; when the received signal strength is between-45dBm and -
38dBm, the indicator is orange. It is suggested to adjust the direction of the
donor antenna to make the indicator just change from green to orange which
indicates the received signal strength is around -48dBm.
5.2.1 Adjust the donor antenna direction until the “Alarm” indicator just
change from green to orange.
5.2.2 Connect the donor antenna port to the REPEATER “BS” port.
If the “Alarm” indicator stays green when you change the donor antenna
direction, this means the donor signal is too weak and you will get degraded
coverage even no coverage. Following are what you need to do
5.2.3 Immediately report to the project manager and system design engineer.
5.2.4 Recommend to confirm the signal strength using a spectrum analyzer
if possible.
5.2.5 Work with your project manager and system engineer, check if you can
replace the donor antenna by a higher gain antenna to get better signal.
5.2.6 Work with your project manager and system engineer, check if you can
relocate the donor antenna to get better signal.
6. Connect the service antenna to REPEATER’s “MS” port.
7. Set all attenuation switches on the ATT switch panel to off position, unless the
system design document requires to reduce the uplink and down gains from factory
default values.
8. Check and ensure “BS” and “MS” ports are connected to feedlines.
9. Connect the power adapter, and plug in the power supply.
10. Follow the test plan, walk test the call quality in the service area.
11. When it is needed, service antennas may be relocated to satisfy coverage
requirement. You will need to get approval from your project manager and system

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design engineer.
12. During the walk test, if self oscillation (Refer to Section 9) is observed, this means
either the donor signal is too strong or antenna isolation is insufficient. Report to
the project manager and system design engineer. Repeat Step 4, 5 and 10 if
possible. If the self oscillation still occurs, then
13. The gain of uplink or the downlink, or both needs to be reduced. Use the
combination of switches 1-5 for uplink and 6-10 for downlink to reduce the uplink
and downlink gain respectively. Repeat the walk test until the coverage is
acceptable. Document and report to project manager and system design engineer
on the gain value settlement.
14. Document the installation and test reports, and submit to project manager for
approval.
Section 7 Notices
1. Never Turn on the equipment until both “BTS” and “MS” are connected to
Antenna.
2. Always remove excessive feed lines from the equipment to donor antenna and
service antenna to minimize the cable loss.
3. Always install the donor antenna at the most available highest position and
keep distance from the service antenna to maximize the isolation between each
other. The vertical distance between donor and service antenna should be
more than 3 meters.
4. Certain isolation between donor antenna and service antenna are required to
avoid self-oscillation. In case self-oscillation happens, reposition is required for
the antennas.
5. The donor antenna must be placed at least 2 meters away from other antennas
on the same site.
6. All feed line connections must be waterproofed.
Self oscillation: During the walk test, if handheld indicates there is signal but no
communication, this often means self oscillation occurs. Check the Alarm indicator, if it is
red, this means the donor signal is too strong or antenna isolation is insufficient. Adjust the
downlink attenuation, if the red indicator disappears, then this means the donor signal is
too strong. If the red indicator does not disappear, or the red indicator disappears only if
both uplink and downlink ATT switches are on, this indicates that there is no sufficient
isolation between the donor antenna and service antennas.

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Section 8 Troubleshooting
Table 4. Troubleshooting
No Cause Alarm Run Action
1
Input signal level is too
low, receive signal< -
65dBm
Green
light blinks
Green Adjust the place of donor antenna.
Then find stronger signal.
2
Signal is normal, the
receive signal between
-65dBm to -45dBm
Green Green
-65dBm ≤X≤ -45dBm
This is the best working condition
for the repeater.
Do not need to take any action.
3 ALC work 5-10dB Orange Green Threshold :X≥ -42dBm
4 ALC work 15-20dB Red Green Threshold :X≥ -37dBm
5 ALC work>25dB, self-
excitation now
Red
light blinks
Red
light blinks
(1) Adjust the gain If the input
signal level is too high or the space
of donor antenna and service
antenna is not enough.
(2) If the red light still turning on
that means over accepting of donor
antenna or strong interference,
then adjust the place of donor
antenna.
6 PLL unlocking No light Green The equipment is broken,
Please contact supplier
7 temperature alarm Red
light blinks
No light UL and PL power amplifier will turn
off
8
Primary-slave
communication
exception
Green Green light
blinks

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Section 9 Product Specifications
Table.2 Product Specifications
Items Uplink Downlink
Frequency Range 832~862MHz 791~821MHz
Center frequency adjustment step 100kHz 100kHz
Bandwidth adjustable, default=30Mz 0.1-30MHz 0.1-30MHz
Bandwidth adjustment step 100KHz 100KHz
Output Power 25±2dBm 25±2dBm
Max Gain 75±2dB 75±2dB
Gain Range 45~75dB 45~75dB
Ripple ≤6dB ≤6dB
Input VSWR ≤2 ≤2
Max. Input Power Without Damage -10dBm -10dBm
ATT step of 1dB
1 ~ 10dB ∣△∣≤1dB ∣△∣≤1dB
10 ~ 20dB ∣△∣≤1dB ∣△∣≤1dB
20 ~ 30dB ∣△∣≤1.5dB ∣△∣≤1.5dB
ALC Active 10dB ∣△∣≤2dB ∣△∣≤2dB
Out of Band Gain
±600kHz ≤ 45dB ≤45dB
±1MHz ≤ 40dB ≤40dB
±5MHz ≤ 40dB ≤ 40dB
Intermodulation Products ≤-45dBc ≤-45dBc
Spurious
Emission
9KHz~1GHz ≤ -36dBm ≤ -36dBm
1GHz~12.75GHz ≤ -30dBm ≤ -30dBm
Noise Figure @ max. gain ≤ 8dB ≤ 8dB
Time Delay ≤8μs ≤ 8μs
Alarm
ALC not Active — Green
ALC Active 5-10dB — Orange
ALC Active 15-20dB — Red
broken No Light
self-excitation Red flashes
Low input signal Green flashes
Run normal Green
self-excitation Red
Power Supply AC 99~240V to 5V 4A

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Items Uplink Downlink
Power Consumption ≤20W
Dimensions 260mmx202mmx45mm
Weight 2.5kg
RF Connector N-Female
Environment Conditions IP40
Humidity < 90%
Operating Temperature -10℃~+55℃
Section 8 LED Display Panel of Operations Guide.
Fig.5
Display Details：
Working Frequency Range
Input & Output Power
Gain
Alarm items
Operating Mode：Automatic or manual

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Fig.6
Plug in the AC 220V, User can see “Variable Band Repeater
B20 System”, Note: can customize Company Logo or Other words.
Fig.7
1. Click “UL” or “DL”, click “OK”，Then you can see the frequency, click “OK” again,
click “+” or “-”
Setting the frequency range which you want and click “OK” finish .
Click “M” back to Main Menu.
Fig.8

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2. Click “OUTPUT POWER”, click “OK”, real-time inquiry Uplink power and downlink
power, only for checking, NO setting. Click “M” back to Main Menu.
When the display power is below standard, Displayed as "---".
When the display power is above standard, displayed as “+++”.
Fig.9
3. Click “GAIN”, click “OK”, real-time inquiry Uplink gain and downlink gain, click “+” or
“-”，then setting gain which you want. click “OK” finish .
click “M” back to Main Menu.
Fig.10
4. Click “ALARM ITEMS”, click “OK”, real-time inquiry PLL, Downlink output power,
AGC, Temperature and RF switch.
Only for checking, NO setting. click “M” back to Main Menu.
（1）DL Output > 27dBm, OK change to Alarm;
（2）ALC work > 25dB, OK change to Alarm;
（3）The display shows the real-time temperature, if the temperature goes beyond the up

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limit, displayed as “Alarm”.
Fig.11
5. Click “MODE”, click “OK”，Recommend “AUTO”.
When “MANUAL”, ALC > 25dB, uplink power will SHUT OFF, need to manually re-power
to TURN ON.