Antenna and Duplexer Options
Option 1 - single antenna without a duplexer
In this configuration, a single antenna is used and connected directly to the Aprisa SR+ Protected Station
TX/ANT (A/B side) TNC port on the front panel. In this option Protected Station can operate in:
• Half duplex RF operation only
If single frequency used, standby radio TX is OFF/Mute (as RX/TX on same connector).
If dual frequency used, standby radio TX is ON, transmit to internal load for fault monitoring.
Only the active radio receives the signal (single RX path) from the antenna.
Option 2 - single antenna with a single duplexer
In this configuration, a single antenna is used with a duplexer which is connected to the Aprisa SR+ Protected
Station TX/ANT and RX (A/B side) TNC ports on the front panel. In this option, the Protected Station can
operate in:
• Half or full duplex RF operation
• Only dual frequency supported, where standby radio TX is ON, transmits to internal load for fault
monitoring
When the ‘Protection Type’ is set to ‘monitored hot standby’ (Terminal > Operating Mode), the standby
radio RX/TX can be fault monitored. This mode has a 4 dB loss in RX sensitivity.
When the ‘Protection Type’ is set to ‘redundant’, the standby radio RX/TX will not be fault monitored. This
mode has 1 dB loss in RX sensitivity.
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