B) Additional hints
❏ Is the antenna properly connected?
Use an antenna with the following features:
➫ Frequency range : dual-band GSM 900/1800 MHz.
➫ Impedance : 50 Ohms.
➫ Gain (antenna + cable) : 0dBi.
➫ VSWR (antenna + cable) : -10dB.
❏ Is the received signal strong enough?
➫ With the AT-Command AT+CSQ check that the received signal (1
st
parameter of the response) is strong
enough to be able to establish a call.
* based on general observations.
❏ The modem always returns «No carrier» when trying to issue a voice communication?
➫ Insure the character «semicolon» is present straight after the phone number on the AT-Command
ATD######;
❏ The modem always returns «No carrier» when trying to issue a data communication?
➫ Insure the selected bearer type is supported by the called party.
➫ Then, insure the selected bearer type is supported by the Network.
➫ If no success, try bearer selection type: AT+CBST=0,0,3.
➫ Insure the SIM Card is available for Data/Fax calls.
5.4 Further questions
For further troubleshooting information, please check our Frequently Asked Questions on www.wavecom.com (customer
support section).
TROUBLESHOOTING
Wavecom WMOD2B Modem 15
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