3Mini-IBA Manual
05/31/01
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 (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 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.
