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Enfora Enabler II-G Assisted GPS
Modem Integration Guide
The SDK117 has three antenna cables. One cable is for connection to the RF connector for
quad band GSM/GPRS antenna. The second RF cable is for a passive PCB patch antenna
that can be used for the GSM/GPRS antenna. The third antenna is for the passive GPS patch
antenna.
However, if the GPS antenna is more than 10 cm away from the module (a likely scenario),
one should consider using an active GPS antenna. An active antenna has an integrated low
noise amplifier (LNA) and needs power to activate this circuit and for the antenna to work.
For optimum operation, the maximum in band input RF level into the Enfora Enabler II-G A-
GPS GPS antenna port should not exceed –95 dBm. If this condition exceeds, the
subsequence analog gain stage in the GPS chip set may saturate causing degradation in
overall system performance. Out of band RF level in excess of –70 dBm at the antenna port
may also cause system degradation. Because most active antenna do not provide out of band
rejection with a high Q filter, end users should take special precaution in selecting the active
gain versus cable loss. A quality patch antenna can easily provide in band gain of 3 to 5 dBi
and out of band gain of 0 dBi, together with the LNA gain, it can boost out of band signal above
the –70 dBm range.
Please refer to MLG0208TN001 – External Active GPS Antenna Design Guide for MLG0208 A-
GPS Module.
6.5.1. Antenna Solder Pads
Pads are provided to solder a cable or antenna directly to the Enabler II-G A-GPS board.
6.5.2. GSM Antenna Connector
The Enabler II-G A-GPS module utilizes an ultra Miniature Coaxial Interconnect from
Sunridge (MCB-ST-00T) as the on-board antenna connector. A compatible mating
connector is the Sunridge MCB2-xx-xx-xxx-x series component. The cable assembly is
made to order. Maximum stack height of cable connector and PCB connector is 2.0 mm.
6.5.3. GPS Antenna Connector
The Enabler II-G A-GPS module utilizes an ultra Miniature Coaxial Interconnect from
Sunridge (MCB-ST-00T) as the on-board GPS antenna connector. A compatible mating
connector is the Sunridge MCB2-xx-xx-xxx-x series component. The cable assembly is
made to order. Maximum stack height of cable connector and PCB connector is 2.0 mm.
NOTE: For both the GSM Antenna Connector and the GPS Antenna Connector, please
refer to Figure 7 MCB2 Cable Assembly. This diagram will help you determine the
exact part number you will need to build the cable. For more detailed information, please
refer to the Sunridge website at
http://www.sunridgecorp.com.
MLG0208PB001 25 Version1.01 – 10/3/2006