Installing the Device
2.5.3 Connecting LTE Antennas
NOTICE
Configuration hazard hazard – risk of reduced performance.
Each antenna and connecting cable must have a nominal impedance of 50 Ω
with a return loss of better than 10 dB across each frequency band. If the nominal
impedance is different, Radio Frequency (RF) performance will be reduced.
Note
The antenna installation must be as per Article 810 of the National Electric Code
(NEC). Specifically, the grounding conductor must not be less than 10 AWG (Cu). The
scheme should be either:
• In accordance with UL 96 and 96A Lightning Protection Components and
Installation Requirements for Lightning Protection Systems (LPS)
• Tested in accordance with UL 50 and UL 497
Note
A Radio Frequency (RF) site survey is recommended prior to any installation to help
determine the best location for the LTE antennas. For assistance, contact a Siemens
Sales representative.
Note
The cellular modem supports SISO (Single Input Single Output) and MIMO (Multiple
Input Multiple Output) modes. At minimum, a single antenna connected to the
LTE MAIN
port is required for SISO mode and to support lower generation wireless
standards, such as GSM or EDGE. A separate diversity (secondary) antenna is required
for MIMO performance.
Note
For mobile and fixed operating configurations, in accordance with R&TTE Directive
1999/5/EC, the maximum antenna gain is 3 dBi for 900 MHz, 1800 MHz, 2100 MHz
and 2600 MHz.
Note
For mobile and fixed operating configurations, in accordance with FCC 47 CFR,
section 2.1091, the antenna gain, including cable loss must not exceed:
• 6.0 dBi at 700 MHz
• 3.0 dBi at 800/850 MHz
• 6.0 dBi at 1700 MHz
• 3.0 dBi at 1900 MHz
Under no conditions may an antenna gain be used that would exceed the ERP and/or
EIRP power limits specified in FCC 47 CFR Parts 22, 24, 27 and 90.
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RUGGEDCOM RX1400
Installation Manual, 01/2021, C79000-G8976-1103-17
