NB3720
User Manual for NRSW version 4.4
Keep in mind that effects caused by Faraday cages such as large metal surfaces (elevators, machine
housings, etc.), close meshed iron constructions and others may reduce signal reception significantly.
The following table shows how to connect the LTE/UMTS antenna. Generally, LTE antennas use both,
main and auxiliary ports, but UMTS requires only main ports.
Antenna Port
Type
M1
(Top)
Main
M2
(Bottom)
Auxiliary
Table 4.1.: LTE/UMTS antenna port types
Attention:
Following points must be observed when installing the antennas:
– A minimum clearance of at least 40 cm between people and the antennas must always
be ensured.
– If one mobile inerface transmit simultaneously with other collocated radio transmitters
the separation distance of 20 cm between the antennas must be maintained at all
times.
– Antennas which are installed outside a building or the vehicle hull must limit transient
overvoltages (according to IEC 62368-1) to below a peak of 1500 V through external
protection circuits.
– Mobile communications antennas may have an amplification of maximum 2.5dBi, in-
cluding the cable attenuation, in the relevant frequency range.
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