User's Manual

Table Of Contents

TB9400 Installation and Operation Manual Description 11

1.2 Modules

The base station consists of a subrack with up to two transmit/receive

channels, or up to two receive-only channels.

Receive-only base stations are currently available for operation only on

B3 band (148MHz to 174MHz

The single PMU (power management unit) supplies and manages power to

the whole subrack (refer to “Theory of Operation” on page 19). One reciter

and one PA (power amplifier) are needed for each transmit/receive channel.

The PA is not required for a receive-only base station. There is also a front

panel with user controls and fans. The modules are interconnected at the

front of the subrack. External connections to the modules are located at the

rear.

Modules come in different variants depending, for example, on the RF

band or the supply voltage.

Each module is inserted into the 4U subrack from the front and is secured

at the front with a metal clamp. Both clamp and module are easily removed

for rapid module replacement. The modules are secured laterally with

plastic guides that clip into the top and bottom of the subrack. These guides

can be easily repositioned to change the configuration of a subrack. The

heavier modules are also secured laterally by metal tabs at the rear of the

subrack.

The following provides a brief description of the available modules.

Reciter The reciter module comprises the

receiver, exciter and digital control

circuitry. The reciter provides the

Ethernet interface and system inputs

and outputs.

Receive-only reciters are not fitted

with the transmit circuitry and are

physically unable to transmit.

1. Refer to “Frequency Bands and Sub-bands” on page 17.