Sierra Wireless airprime wismo218 User Manual
WA_DEV_W218_PTS_002
Rev 005
Page 80 of 109
Product Technical Specification &
Customer Design Guidelines
RF Interface
The impedance is 50 nominal and the DC resistance is 0.
RF Connection
The RF input/output of the WISMO218 is through one of the castellation pins (Pin 21). A 50
stripline can be used to connect to standard RF connectors such as SMA, UFL, etc. for antenna
connection.
stripline can be used to connect to standard RF connectors such as SMA, UFL, etc. for antenna
connection.
Note:
The antenna cable and connector should be chosen in order to minimize loss in the frequency bands
used for GSM900MHz and 1800MHz.
used for GSM900MHz and 1800MHz.
Note:
0.5dB can be considered as a maximum value for loss between the WISMO218 and an external
connector.
connector.
RF Performances
RF performances are compliant with the ETSI recommendation GSM 05.05.
The main parameters for the Receiver are:
E-GSM900 Reference Sensitivity = -109 dBm (typ.)
DCS1800 Reference Sensitivity = -109 dBm (typ.)
Selectivity @ 200 kHz : > +9 dBc
Selectivity @ 400 kHz : > +41 dBc
Linear dynamic range: 63 dB
Co-channel rejection: >= 9 dBc
The main parameters for the Transmitter are:
Maximum output power (EGSM): 33 dBm +/- 2 dB at ambient temperature
Maximum output power (GSM1800): 30 dBm +/- 2 dB at ambient temperature
Minimum output power (EGSM): 5 dBm +/- 5 dB at ambient temperature
Minimum output power (GSM1800): 0 dBm +/- 5 dB at ambient temperature
Antenna Specifications
The antenna must fulfill the requirements listed in the table below.
The optimum operating frequency depends on the application. A dual Band antenna will work in
these frequency bands and should have the following characteristics:
these frequency bands and should have the following characteristics: