User's Manual

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peiker acustic GmbH & Co. KG, Max-Planck-Straße 28-32, D-61381 Friedrichsdorf, Amtsgericht Bad Homburg HRA 1897
phG: peiker Verwaltungs GmbH, Vorsitzender der Geschäftsführung: Andreas Peiker, Geschäftsführer: Reinhard Kromer-von Baerle, Amtsgericht Bad Homburg HRB 1369
Vorsitzender des Aufsichtsrates: Dr. Helmut Rothenberger Ein Unternehmen der peiker Firmengruppe
Figure 6: FAKRA HF Single connector
Figure 7: FAKRA HF Dual connector
For detailed information see the datasheet of those connectors. The device numbers of connectors see
the reference 3 and 4 at the Table 1: References.
3.3.3.2. Antenna Switching
For switching between main and backup antenna a RF – switch SPDT is soldered on the PCB of the
NAD6200 – module. The switch is controlled by two GPIO´s. The following Table 19 shows 4 switch
combinations.
Table 19: switch combinations
GPIO_55
GPIO_56
Antenna
Comment
Low
Low
None
Whole transmission power would be reflected
Low
Hi
Main
Outside antenna connector
Hi
Low
Backup
Inside antenna connector
Hi
Hi
Both
Mismatching
The switching between different states must be synchronized with QCT software, because it is not
allowed to switch between main and backup antenna during the GSM transmission pulse.
The state GPIO_55 = Hi and GPIO_56 = Hi is not allowed and have to avoid via software.
At the moment the main antenna is switched on by default. The main antenna is mapped to SMB
connector close to outer dimension of the NAD6200 – module.