Westell CSI110-01 Bidirectional Amplifier User Manual 1

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Document ID	69854
Application ID	lhVF8UfDPUOEF8Vlt1Fp0A==
Document Description	User Manual 1
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	7.81kB (97596 bits)
Date Submitted	1999-11-15 00:00:00
Date Available	1999-12-20 00:00:00
Creation Date	2001-05-17 16:53:29
Producing Software	Acrobat Distiller 4.0 for Windows
Document Lastmod	2001-05-17 16:53:33
Document Title	User Manual 1

Cellular Specialties, Inc.
Model 110 Miniature In-Building Amplifier
Operation and Users Manual
Mini-IBA Manual-A
05/17/01
Table of Contents
1. Product Description
Background
Functional Description
Circuit Description
Functional Block Diagram
Outline Drawing
2. General Specifications
3. Inspection and Installation
Inspection of Contents
Package Contents
Installation
Safety
Mini-IBA Manual-A
05/17/01
1. Product Description
Background
The performance of a cell phone can be easily degraded when in enclosed
structures where signals from a local cell site are not sufficient for reliable
phone operation. The Model 110 Miniature In-Building Amplifier (MiniIBA) was developed by Cellular Specialties, Inc. (CSI) to enhance cellular
performance within these enclosed structures. Specifically, the Mini-IBA is
designed to cover small areas such as home offices, small workshops, etc.
Functional Description
The Mini-IBA boosts the cellular performance by providing amplification of
both transmit and receive signals. The unit receives the portable phone’s
signal through an interior antenna, amplifies it and then sends it to an outside
antenna. This signal is referred to as the “Uplink”. The Mini-IBA also
receives signals from the Cell Site base station through the outside antenna.
This signal is amplified and re-radiated to the portable phone and is referred
to as the “Downlink”. It is necessary that sufficient signal be available at the
external antenna.
The external antenna is usually a directional type such as a “Yagi”, however
an Omni-directional antenna may be used when the structure is located in
close proximity to one or more cell sites. Internal antennas are usually
Omni-directional although other types, such as low profile wall or ceiling
mount, may be used for special installations.
As shown in Figure 1, there are three stages of gain in the Downlink and 2
stages in the Uplink for a nominal gain of 40 dB in each link. The maximum
linear output power for the Uplink is 500 milli-Watts and 30 milli-Watts for
the Downlink.
An LED indicator on the unit shows the application of power.
Mini-IBA Manual-A
05/17/01
Circuit Description
Uplink
The uplink rf circuit consists of two stages of gain. Each gain stage is a
monolithic integrated circuit (mmic) mounted to a printed circuit board
(PCB). The signal received by the inside antenna is directed to the 1st mmic
stage by a frequency diplexer, which separates the uplink frequency (806824 MHz) from the downlink frequency (851-869MHz). This signal is
amplified by both mmic stages and directed to an identical diplexer at the
output of the 2nd stage. Both stages are biased for linear operation. The
overall gain from the inside antenna terminal to the outside antenna terminal
is nominally 40 dB. Each diplexer provides 60 dB of rejection between the
uplink amplifier chain and the downlink.
Downlink
The downlink circuit is similar in operation to the uplink, in that it also uses
two stages of mmic amplification. The major differences are the downlink
frequency (851-869 MHz), the overall gain (30 dB) and signal flow in the
opposite direction.
Power Supply
All the mmic amplification stages, in both the uplink and downlink, operate
from a single supply voltage of +5 Vdc. A linear regulator is used to
provide the 5 volts from an input of 12 Vdc. All internal dc circuits are
filtered and de-coupled from the rf circuits. A 115 Vac to 12 Vdc “Wall”
supply is provided as part of the unit. The overall current at 12 Vdc is less
than 1.0 Amp.
Mini-IBA Manual-A
05/17/01
FIGURE 1 Functional Block Diagram
FIGURE 2 Outline Drawing
Mini-IBA Manual-A
05/17/01
2. General Specifications
All specifications stated as typical unless otherwise noted. Cellular Specialties, Inc.
reserves the right to change these specifications at any time without prior notice.
Frequency Band
Gain
Typical Power Out
Noise Figure
3rd Order Intercept
Propagation Delay
VSWR
Passband Ripple (max)
Connectors
Power Requirements
Dimensions
Weight
Indicator LED
Downlink
850-870 MHz
40 dB
+28 dBm
6 dB
+43 dBm
<1 microsecond
<2:1
2 dB pk-pk
Uplink
806-824 MHz
40 dB
+15 dBm
6 dB
+27 dBm
<1 microsecond
<2:1
2 dB pk-pk
Mini-UHF
+6 Vdc, 1.0 A
3.5”x4.0”x1.2”
1 lbs.
“Power-On”
Mini-IBA Manual-A
05/17/01
3. Inspection and Installation
Inspection
Inspect the equipment as soon as possible after purchase. If any part of the
equipment has been damaged in transit, report the damage to the
transportation company and also to the company where purchased.
Contents
The unit package contains the following:
Model 110 Mini-IBA
Power Transformer, 110 volt to 6 volt – model number (
User Manual
Optional Accessories
Accessories are available directly from Cellular Specialties, Inc. or any of
CSI’s distributors.
Exterior High Gain Antenna – model number (
Exterior Omni Antenna – model number (
Interior Omni Antenna – model number (
Power Cable w/cigarette lighter adapter – model number (
Installation
The installation of the Mini-IBA is relatively simple. If possible,
measurements of the Received Signal Strength Indicator (RSSI) should be
recorded as close as possible to the proposed exterior antenna location.
Optimum performance will be obtained with RSSI readings greater than –85
dBm.
With the exact location of the exterior antenna and the coordinates of the cell
sits closest to the building in which the unit is being installed, the distance
and bearings to each of the local cells can be determined. The first choice
would be the closest site unless there is blockage in the form of buildings or
terrain. If blockage exists, an alternate site may be available.
If coordinates are not available, measure the RSSI at the external antenna
output by connecting a phone to the external antenna and slowly rotating the
antenna until a maximum reading is obtained.
Mini-IBA Manual-A
05/17/01
The Mini-IBA and interior antenna should be centrally located, keeping
coaxial cable runs to a minimum. A maximum length of 100 feet of low loss
cable is recommended. The actual coax used should be RG-8 type with a
flame retardant rating as a minimum. If the coax is run through an area
where heating and/or cooling air is channeled, a plenum rated coax should
be used. When mounting the amplifier, take care to avoid areas of high heat
or extreme cold. In general, do not place the unit on or near the top of high
ceilings, by heaters or in cold storage areas.
During installation, care must be taken to provide the maximum isolation
between interior and exterior antennas. This isolation should be in the order
of 70 dB to prevent any re-generative feedback in the system. Feedback of
this nature may cause the amplifier to emit a continuous signal at maximum
amplitude and could, in some cases, interfere with the normal operation of
the cell site.
There are no installation or user adjustments or tuning on this unit.
CAUTION
Inside antennas should be positioned to observe minimum
separation of 2.3 cm. (~ 1.0 in.) from any workstation.
Personnel working in the vicinity of inside (downlink)
antennas should observe the following guidelines for
minimum distances between the human body and the
antenna when establishing the position of new workstations.
The placement of a workstation must be in excess of 2.3 cm. (~ 1.0 in.) from
any interior antenna. Exceeding this minimum separation will ensure that
the employee does not receive RF-exposure beyond that Maximum
Permissible Exposure according to section 1.1310 i.e. limits for General
Population/Uncontrolled Exposure.
Mini-IBA Manual-A
05/17/01

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