Introduction to the SINAUT ST7 system
1.6 LTOP overvoltage protection modules
Station control system
System Manual, 07/2009, C79000-G8976-C178-07
47
Technical specifications of the ANT794-4MR GSM/GPRS antenna
ANT794-4MR
Mobile wireless networks
GSM/GPRS
Frequencies
850 MHz,
900 MHz,
1800 MHz,
1900 MHz,
2200 MHz
Characteristics
omnidirectional
Antenna gain
0 dB
SWR
< 2,0
Max. power
20 W
Polarity
linear vertical
Connector
SMA
Length of antenna cable
5 m
External material
Hard PVC, UV-resistant
Degree of protection
IP20
Permitted ambient conditions
•
Operating temperature
•
Transport/storage temperature
•
Relative humidity
•
-40 °C t70 °C
•
-40 °C t70 °C
•
100 %
Construction
•
Dimensions (D x H) in mm
•
Weight
•
Installation
•
25 x 193
•
380 g (incl. packing)
•
with supplied bracket
1.6
LTOP overvoltage protection modules
1.6.1
Variants and overview of the LTOP overvoltage protection modules
Copper dedicated lines are highly susceptible to electromagnetic interference. The coupling
of extraneous voltages can be inductive or capacitive, for example due to the effects of
lightning. Direct conductive coupling is also possible due to bad insulation.
The LTOP overvoltage protection modules limit extraneous voltage and overvoltage to a
non-critical level. The floating transformer also provides electrical isolation preventing
coupling of voltages into other cable sections. An LTOP protects persons and investment
and is therefore an indispensable safety element in private dedicated line networks.
