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 through +70 °C
• -40 °C through +70 °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.
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