Wirnet iBTS
Document title : Installation and
Maintenance Manual
Version : 2.0
Author : SNI
Date : 04/12/2018
Classification
This document is the strict property of Kerlink and shall not be either copied nor sent without express
written authorization of Kerlink
Internal Use
Kerlink m2m technologies reserved rights
Confidential
Kerlink – 1 rue Jacqueline Auriol – 35235 THORIGNÉ-FOUILLARD
Page 101 / 221
Strict confidential
1.8.3.5
918-923MHz cavity filter
The 918-923MHz cavity filter is typically dedicated to Malaysia market. The purpose of this
filter is to avoid saturation and desensitization of the LoRa receiver due to co-located
EGSM900 base stations.
The 918-923MHz cavity filter characteristics are detailed in the following table:
Characteristics
Specification
Band pass
918 to 923MHz
Center frequency (Fc)
920,5MHz
Frequency bandwidth
5MHz
Insertion Loss
<3dB @25°C
<5.7dB @full temp
Band Ripple
<1.8dB @25°C
<3.2dB @full temp
Out of Band Rejection
>40dB @925MHz
>40dB @915MHz
>70dB @927MHz
>70dB @910MHz
Return Loss
>20dB
Input and Output Impedance
50 Ohm
Max Input Power
10W CW
Temperature range
-30°C / +60°C
Ports
In N male / Out N female
Positions of the ports
Opposite sides (right / left)
Dimensions
150mm x 80mm x 50 mm
Weight
<1Kg
Waterproof
IP66 min
The dimensions of the 918-923MHz cavity filter are detailed hereafter:
Figure 59 : Dimensions of the 918-923MHz cavity filter