Cellular Specialties 110 User manual

1960-0110-003 Rev C

05/08/01

Cellular Specialties, Inc.

Model 110 Miniature In-Building Amplifier

Operation and Users Manual

2960-0110-003 Rev C

05/08/01

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

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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 (Mini-

IBA) 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 inside 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

outside antenna.

The outside 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. Inside 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 2 stages of RF gain in both the Downlink

and Uplink for maximum gains of 30 dB and 40 dB respectively. The

maximum linear output power for the Uplink is 300 milli-Watts and 25

milli-Watts for the Downlink.

An LED indicator on the unit shows the application of power.

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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 (806-

824 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.

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FIGURE 1 Functional Block Diagram

FIGURE 2 Outline Drawing

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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.

Downlink Uplink

Frequency Band 851-866 MHz 806-821 MHz

Linear Gain (dB) 25 min / 30 max 35 min / 40 max

Typical Power Out (max)

1 dB Compression +17 dBm +27 dBm

Linear +14 dBm +25 dBm

Noise Figure 6 dB 6 dB

3rd Order Intercept +43 dBm +27 dBm

Propagation Delay <1 microsecond <1 microsecond

VSWR <2:1 <2:1

Passband Ripple (max) 2 dB pk-pk 2 dB pk-pk

Connectors Mini-UHF

Power Requirements +12 Vdc, 1.0 A

Dimensions 3.5”x4.0”x1.2”

Weight 1 lbs.

Indicator LED “Power-On”

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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 12 volt – model number ( )

User Manual

Optional Accessories

Accessories are available directly from Cellular Specialties, Inc. or any of

CSI’s distributors.

Outside High Gain Antenna – model number ( )

Inside Omni Antenna – model number ( )

Installation

Note:

The Installer should refer to the Safety Precautions, in the following section,

for proper antenna selection and 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 outside antenna location.

Optimum performance will be obtained with RSSI readings greater than –85

dBm.

With the exact location of the outside antenna and the coordinates of the cell

sites 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.

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If coordinates are not available, measure the RSSI at the outside antenna

output by connecting a phone to the outside antenna and slowly rotating the

antenna until a maximum reading is obtained.

The Mini-IBA and inside 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 inside and outside 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.

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Safety Precautions CAUTION

For INDOOR use, an Omni-Directional Antenna with a maximum gain of 3dBi is

authorized for use with this unit.

Inside antennas must be positioned to observe minimum separation of 20 cm.

(~ 8 in.) from all users and bystanders. For the protection of personnel working

in the vicinity of inside (downlink) antennas, the following guidelines for

minimum distances between the human body and the antenna must be

observed.

The installation of an INDOOR antenna must be such that, under normal

conditions, all personnel cannot come within 20 cm. (~ 8.0 in.) from any

inside antenna. Exceeding this minimum separation will ensure that the

employee or bystander does not receive RF-exposure beyond the

Maximum Permissible Exposure according to section 1.1310 i.e. limits for

General Population/Uncontrolled Exposure.

For OUTDOOR use, a Directional Antenna up to a maximum gain of 11dBd is

authorized for use with this unit.

The Outside antenna must be positioned to observe minimum separation of

120 cm. (~ 4 ft.) from all users and bystanders. For the protection of personnel

working in the vicinity of outside (uplink) antennas, the following guidelines for

minimum distances between the human body and the antenna must be

observed.

The installation of an OUTDOOR antenna must be such that, under normal

conditions, all personnel cannot come within 120 cm. (~ 4 ft.) from the

outside antenna. In all installations, the antenna should never be mounted

such that the main beam is directed toward an area where workers or

bystanders may be present. Exceeding this minimum separation will

ensure that the worker or bystander does not receive RF-exposure beyond

the Maximum Permissible Exposure according to section 1.1310 i.e. limits

for General Population/Uncontrolled Exposure.

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