Table of Contents
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Introduction to the SINAUT ST7 system
2.6 LTOP overvoltage protection modules
Technical specifications of the ANT794-4MR GSM/GPRS antenna
ANT794-4MR
Mobile wireless networks
Frequencies
Characteristics
Antenna gain
SWR
Max. power
Polarity
Connector
Length of antenna cable
External material
Degree of protection
Permitted ambient conditions
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•
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Construction
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2.6
LTOP overvoltage protection modules
2.6.1
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.
72
Operating temperature
Transport/storage temperature
Relative humidity
Dimensions (D x H) in mm
Weight
Installation
GSM/GPRS
850 MHz,
900 MHz,
1800 MHz,
1900 MHz,
2200 MHz
omnidirectional
0 dB
< 2,0
20 W
linear vertical
SMA
5 m
Hard PVC, UV-resistant
IP20
-40 °C through +70 °C
•
-40 °C through +70 °C
•
100 %
•
25 x 193
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380 g (incl. packing)
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with supplied bracket
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SINAUT ST7 Station control system - System Manual
System Manual, 05/2007, C79000-G8976-C178-06
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