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3. RF Integration
3.1.
Supported RF Bands
Table 6.
RF Bands
Technology
GSM
1
WCDMA
1
WCDMA channel spacing is 5 MHz, but this can be adjusted to optimize performance in a particular
deployment scenario.
3.1.1.
Ground Connection Guidelines
When connecting the module to system ground:
Prevent noise leakage by establishing a very good ground connection to the module through
the host connector.
Minimize ground noise leakage into the RF.
Depending on the host board design, noise could potentially be coupled to the module from
the host board. This is mainly an issue for host designs that have signals traveling along the
length of the module, or circuitry operating at both ends of the module interconnects.
3.1.2.
Shielding Guidelines
The module is fully shielded to protect against EMI and to ensure compliance with FCC Part 15 -
"Radio Frequency Devices" (or equivalent regulations in other jurisdictions).
Note:
This shielding must NOT be removed.
3.2.
Antenna Guidelines
3.2.1.
Choosing the Correct Antenna and Cabling
Consider the following points for appropriate antenna selection:
The antenna (and associated circuitry) should have a nominal impedance of 50Ω with a return
loss of better than 10 dB across each frequency band of operation.
The system gain value affects both radiated power and regulatory (FCC, IC, CE, etc.) test
results.
4112719
Band
GSM 850
EGSM 900
DCS 1800
PCS 1900
Band I (WCDMA 2100)
Band V (WCDMA 850)
Band VI (WCDMA 800)
Rev 2.1
Tx Frequency (MHz)
824 – 849
880 – 915
1710 – 1785
1850 – 1910
1920–1980
824 – 849
830–840
January 07, 2013
Rx Frequency (MHz)
869 – 894
925 – 960
1805 – 1880
1930 – 1990
2110–2170
869 – 894
875–885
12
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