GuidePort: System Manual
27. November 2000
Seite 9
2.2
Active Antenna Unit
2.2.1
Description
The Active Antenna Unit receives the data stream from the Cell Transmitter via an
LVDS interface. The data stream is then FSK modulated onto an RF carrier in the 2.4
GHz ISM Band and transmitted to the GuidePort receivers. Settings for transmission
frequency, RF output power and the antenna to be used (internal or external antenna)
are controlled by the Cell Transmitter.
2.2.2
Hardware Interfaces
MTS IN
Connects the Active Antenna Unit to the GuidePort Cell Transmitter. The connection
cable supplies the Antenna Unit with both DC and the digital data stream to be
transmitted. When the associated Cell Transmitter is switched on, it will automatically
configure the Antenna Unit.
MTS OUT
For connecting (daisy-chaining) a second Active Antenna Unit. The second Antenna
Unit will transmit the same data stream, but on another RF carrier. This feature is not
available in this customized version, instead you can connect measuring equipment to
MTS OUT.
RF OUT
For connecting an optional, external directional antenna. If you want to use an external
antenna, you have to select the “External Antenna” option when configuring the Cell
Transmitter with the Central Unit software.
2.2.3
User Interface
ADDRESS
The Active Antenna Unit is automatically configured by the Cell Transmitter when the
transmitter is switched on. The default address is No. 1. Presently, other addresses are
not supported.
RF OUT
ADDRESS
OUT
MTS
IN
GuidePort AM 3000
