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0.5dB can be considered as the maximum value for loss between the WISMO228 and an external
connector.
RF Performances
RF performances are compliant with ETSI recommendation GSM 05.05. Listed below are the main
parameters for both the Receiver and the Transmitter.
The main parameters for the Receiver are:
•
GSM850/EGSM900 Reference Sensitivity = ‐108 dBm (typ.)
•
DCS1800/PCS1900 Reference Sensitivity = ‐108 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 optimum operating frequency depends on the application. A dual‐band or a quad‐band antenna
will work in the following frequency bands and should have the following characteristics.
Characteristic
TX Frequency
824 to 849 MHz
RX Frequency
869 to 894 MHz
Impedance
Rx max
VSWR
Tx max
WA_DEV_W228_PTS_002
Table 41. Antenna Specifications
GSM 850
E-GSM 900
880 to 915 MHz
925 to 960 MHz
50Ω
1.5 :1
1.5 :1
Rev 001
Product Technical Specification &
Customer Design Guidelines
WISMO228
DCS 1800
1710 to 1785 MHz
1805 to 1880 MHz
PCS 1900
1850 to 1910 MHz
1930 to 1990 MHz
Page 87 of 108
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