User's Guide

installation Guide
Ref.: MAN/DPL/EN/001
Rev.: 2.3
Date: 29 August 2014
© Copyright SIGFOX. All rights reserved Page 15 of 21
9 Feeders measurement
This measure aims at checking the cable characteristics at 916 MHz and the quality of the installation.
 Type of measurements :
 VSWR
 Loss
 Length
The main feeder measures must not exceed the following:
 VSWR : < 1.2 or 21dB Return loss @ 916 MHz
 Loss : < 6dB max @ 916 MHz
The coaxial jumper cable measures must not exceed the following:
 VSWR : < 1.2 or 21dB Return loss @ 916 MHz
 Loss : < 0.6dB max @ 916 MHz
Maximum cable length depending on cable type:
LMR 400 → max 35m
1/2" LDF4-50 → max 80m
7/8" LDF5-50 → max 125m
The main cable measurement must be performed once it installed in the cable tray. The
connection to the LNA will be performed after the measurement.