VEGA INSYS Modem GPRS 5.0 - Manual (Page 21)

INSYS GPRS 5.0 serial Mounting
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4.5.6 Check the field strength of the GSM signal
2. Read out the GSM field strength.
Use the button "GSM field strength" in the HSComm GPRS.
The field strength is displayed.
The response should be a field strength of at least 12 – other-
wise the antenna location needs to be changed to ensure fault-
less communication.