RT-370 User Guide
Page 21 (34)
4.5 Connecting the RF Antenna Interfaces
The antenna connectors are identified with the text markings A1 (Antenna 1), A2 (Antenna 2), A3 (Antenna 3) and
A4 (Antenna 4). The product is delivered with temporary protecting caps that are removed for antenna cable
installation.
The antenna interfaces are protected against lightning with special protection devices. To ensure correct operation
of these devices it is important, that the earth grounding contact is connected to protective earth as described in
chapter 4.4 with a short cable.
The antennas might be fixed in antenna connectors directly or using antenna cables fixed to the antenna
connectors. The connectors should be secured to correct torque (typically 100Ncm, check connector manufacturer
data), specially for assemblies in vibrating environments.
Pin
Signal Name, Function
Notes
1
Center pin: RF signal
Connector Type: N50 – Female
2
Connector body: RF ground
Table 13 Pinning: RF antenna connector
4.5.1 RF Antenna Interface Operation Modes
RT-370 has four antenna interfaces. The antenna interfaces are operating independently of each other.
Antenna Function
Operation
Notes
A1
Antenna 1 is used for both transmitting
and receiving
The antenna A1 shall be used.
A2
Antenna 2 is used for both transmitting
and receiving
The antenna A2 can be enabled or disabled.
A3
Antenna 3 is used for both transmitting
and receiving
The antenna A3 can be enabled or disabled.
A4
Antenna 4 is used for receiving
The antenna A4 can be enabled or disabled.
Table 14 RF Antenna interface operation
NOTICE: If only one of the communication antennas is used, the antenna port A1 MUST be used.
NOTICE: If one of the antennas is NOT used, the unused antenna conductors MUST be terminated with 50 ohm
termination.
NOTICE: The antenna interfaces are protected against lightning with special protection devices. To ensure correct
operation of these devices it is important, that the earth grounding contact is connected to protective earth as
described in chapter 4.4.
