Tait TB8100, User Manual

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TB8100 Service Kit User’s Manual
Configuring Miscellaneous Items 91
Configuring Miscellaneous Items
The Miscellaneous form (Configure > Base Station > Miscellaneous) gathers
together a number of settings.
Tx relay operation
The Service Kit lets you enable the control of an antenna relay and configure
its operation. The base station’s reciter must be fitted with a system interface
board that has a Tx Relay Driver line for connecting to the antenna relay (see
Configure > Base Station > System Interface for pinout information).
Antenna relays (also known as coaxial relays) are used in simplex applications.
If the transmit and receive frequencies are equal, the base station automatically
increases the transmitter frequency by 25 kHz when the base station is not
transmitting, to prevent desensitisation of the receiver.
Before the transmitter keys up, the base station activates the relay, disconnecting
the receiver and connecting the transmitter to the antenna. It waits for the ‘relay
closing settling time’, and then powers the transmitter up. After it powers the
transmitter down, it waits for the ‘delay before relay opens’, and then opens the
relay.
To enable and configure the operation of an antenna relay
1. Select Configure > Base Station > Miscellaneous