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.
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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.