Siemens TC35i - Manual (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 50Ω.
· 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)