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 99 / 221
Strict confidential
Figure 56 : Frequency response of the 863-873MHz cavity filter
1.8.3.4
915-920MHz cavity filter
The 915-920MHz cavity filter is typically dedicated to the Philippines market. It could be also
used in Israel. The purpose of this filter is to avoid saturation and desensitization of the LoRa
receiver due to co-located EGSM900 base stations.
The 915-920MHz cavity filter characteristics are detailed in the following table:
Characteristics
Specification
Band pass
915 to 920MHz
Center Frequency (Fc)
917,5MHz
Frequency bandwidth
5MHz
Insertion Loss
<2.8dB @full temp
Band Ripple
<1dB
Out of Band Rejection
>40dB @923MHz
>40dB @912MHz
>60dB @925MHz
>60dB @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
