TB8100 Service Kit User’s Manual Configuring Miscellaneous Items 91Configuring Miscellaneous ItemsThe Miscellaneous form (Configure > Base Station > Miscellaneous) gatherstogether a number of settings.Tx relay operationThe Service Kit lets you enable the control of an antenna relay and configureits operation. The base station’s reciter must be fitted with a system interfaceboard that has a Tx Relay Driver line for connecting to the antenna relay (seeConfigure > 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 automaticallyincreases the transmitter frequency by 25 kHz when the base station is nottransmitting, to prevent desensitisation of the receiver.Before the transmitter keys up, the base station activates the relay, disconnectingthe receiver and connecting the transmitter to the antenna. It waits for the ‘relayclosing settling time’, and then powers the transmitter up. After it powers thetransmitter down, it waits for the ‘delay before relay opens’, and then opens therelay.To enable and configure the operation of an antenna relay1. Select Configure > Base Station > Miscellaneous
