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
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Strict confidential
1.8.3.7
920-928MHz cavity filter
The 920-928MHz cavity filter is typically dedicated to the New-Zealand market. The purpose
of this filter is to avoid saturation and desensitization of the LoRa receiver due to co-located
GSM900 base stations.
The 920-928MHz cavity filter characteristics are detailed in the following table:
Characteristics
Specification
Band pass
920 to 928MHz
Center frequency (Fc)
924MHz
Frequency bandwidth
8MHz
Insertion Loss
<3dB
Band Ripple
<1dB
Out of Band Rejection
>60dB @935-960MHz
>60dB @880-915MHz
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 920-928MHz cavity filter are detailed hereafter:
Figure 63 : Dimensions of the 920-928MHz cavity filter
The frequency response of 920-928MHz cavity filter is as follows:
