Antenna Interface - Siemens M20 Terminal Technical Description

Siemens Information and Communication Products
4.5

Antenna interface

The antenna must satisfy the following electrical requirements:
Frequency, TX
Frequency, RX
Impedance
VSWR
Gain
3dB width of cone
Maximum power
In principle, the GSM antenna is selected by the manufacturer of the base unit. The GSM antenna may be mounted directly
or via cable, depending on the application and the RF field at the local site.
The antenna interface connector of the M20 unit is SMR nano (male). Hence, the connector on the GSM antenna or
antenna cable has to be SMR nano (female).
Note: the maximum number of push/pull cycles shall not exceed 100.
For further information on GSM antennas and sources of connectors, see Chapters
"Sources for connectors" on page 157
Version 8 dated 15.03.00
890-915 MHz
935-960 MHz
50 Ω
TX: max. 1.7:1 installed
RX: max. 1.9:1 installed
> 1.5dB referenced to λ/2 dipole
vertical: 80°
horizontal: 360°
1W (cw), 2W peak; at ambient temperature of 55°C
.
Hardware interfaces
7.1 "GSM antenna" on page 154
A
and
7.5
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