Siemens TC35i Manuel d'utilisateur télécharger pdf (Page 25)

TC35i Terminal Hardware Interface Description

Confidential / Released

TC35i_T_HD_v01.05 Page 25/37 10.07.2003

3.6.3 Radio interface

An internal antenna cable adapts the antenna reference point (antenna connector type GSC

from Murata) to the FME (male) connector. The position of the antenna reference point can

be seen in Figure 1.

Inside the TC35i module a 27nH inductor to ground provides additional ESD protection to the

antenna connector. For details see Figure 8.

To protect the inductor from damage no DC voltage must be applied to the antenna circuit.

Figure 8: Antenna connector circuit on TC35i module

· Cable loss of internal cable

<0.4dB @ 900MHz

<0.6dB @ 1800MHz

· The system impedance is 50!.

· In every case, for good RF performance the return loss of the customer application

should be better than 10dB (VSWR < 2).

· TC35i Terminal withstands a total mismatch at this connector when transmitting with

power control level for maximum RF Power.

EMC immunity complies with the vehicular environment requirements according to

EN 301 489-7.

For the application it is recommended to use an antenna with the following FME (female)

connector:

Figure 9: Recommended antenna connector

GSC connector (from Murata)

TRX In / Output

L (27nH)

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Siemens TC35i Manuel d'utilisateur Page 25