5
. Functional Description and Design
Allgon repeaters work as bi-directional on-frequency amplifiers.
A repeater receives, amplifies, and retransmits signals downlink and
uplink simultaneously, i.e. from the base station via the repeater to the
mobile stations and from the mobile stations via the repeater to the base
station.
The repeater is connected to a BS antenna, directed towards the base
station, and to a MS antenna directed towards the area to be covered.
These antennas are connected to the repeater with N type male
connectors.
To prevent instability due to poor antenna isolation, a built-in antenna
isolation supervision feature reduces the gain level automatically when
poor antenna isolation is detected.
The Allgon repeaters are controlled by powerful microprocessors.
Alarm and operational LEDs are visible on the repeater front.
The repeater works with convection cooling without fan.
Operational parameters such as gain, power levels, etc. are set using a
desktop or notebook and the Allgon OMT32, which communicate, locally
or remotely via modem, with the repeater. Remote operation is
performed using a telephone line or a built-in mobile phone equipped with
a data interface.
ALLGON Systems AB
ALR Compact Repeater
Functional Description
VD203 67/EN - User’s Manual
Rev. 1A 2000-07
5 - 1
