4 Antenna Selection
The active antenna is selected using the digital inputs of the multiplexer. Input 1 is LSB. See
the following table for a complete overview. The multiplexer has a fail-safe feature. If there
is no control signal, the multiplexer will connect antenna port one as active port.
Input 1
Input 2
Input 3 (8x / 16x)
Input 4 (16x)
Active Antenna
LOW
LOW
LOW
LOW
Antenna 1
HIGH
LOW
LOW
LOW
Antenna 2
LOW
HIGH
LOW
LOW
Antenna 3
HIGH
HIGH
LOW
LOW
Antenna 4
LOW
LOW
HIGH
LOW
Antenna 5
HIGH
LOW
HIGH
LOW
Antenna 6
LOW
HIGH
HIGH
LOW
Antenna 7
HIGH
HIGH
HIGH
LOW
Antenna 8
LOW
LOW
LOW
HIGH
Antenna 9
HIGH
LOW
LOW
HIGH
Antenna 10
LOW
HIGH
LOW
HIGH
Antenna 11
HIGH
HIGH
LOW
HIGH
Antenna 12
LOW
LOW
HIGH
HIGH
Antenna 13
HIGH
LOW
HIGH
HIGH
Antenna 14
LOW
HIGH
HIGH
HIGH
Antenna 15
HIGH
HIGH
HIGH
HIGH
Antenna 16
Furthermore, the multiplexer is hot switchable. This means that the antenna port can be
switched without having to turn off the HF signal. The power supply has to be connected,
however.
Technical Documentation metraTec HF Multiplexer Page 9 of 13
