KNFT Series Coaxial Signal Lightning Protection Gate
KNFT series lightning protection gate is mainly used for coaxial computer system, monitoring system,
cable TV, public television, satellite TV receiving and video on demand system coaxial communication
equipment terminal's lightning and surge protection.
KNFT/BNC
Working Conditions
▪ working temperature:-40℃~ +80℃
▪ relative humidity:5％~ 95％
Technical Parameter
Model | KNFT/BNC | KNFT—4/BNC | KNFT—16/BNC | |||
nominal voltage | UN | 5V | ||||
Maximum continuous operating voltage | UC | 9V | ||||
Nominal current | IN | 400mA | ||||
Nominal discharge current (8/20μs) | In | 5KA | ||||
Maximum discharge current (8/20μs) | Imax | 10KA | ||||
Limit voltage, at 1n | L—S | Up | ≤40V | |||
S—PG | ≤600V | |||||
transmission frequency | fG | 10MHz | ||||
insertion loss | Ae | ≤0.5db | ||||
response time | tA | ≤1ns | ||||
Series resistor / wire | R | 10Ω | ||||
Protection level | IP20 | |||||
Install wire section | Minimum 0.5mm2 single strand /mulit-strand wire, Maximum2.5mm2 single strand wire /4 mm2 mulit-strand wire | |||||
Protection of large ones | 1 | 4 | 16 | |||
Connection head form | Input | BNC | ||||
Output | ||||||
Note:With a special connector series in the loop, impedance connectors are 50Ω, 75Ω ; joint type has N, F,BNC,L16,7 / 16 and other models,determined by the user based on the device being used to protect joints. | ||||||
Installation And Maintenance
1.This product series in the protected equipment signal circuit, and close to the protected equipment.
2.The input(IN) and output(OUT) cannot be reversed; the input(IN) is the lightning intruding end,
output (OUT)is connected with the protection device.
3.For the normal work of SPD, grounding is very important, the grounding wire cross-sectional area is no
less than 4m square meters and as short as possible.
4.Lightning protection gate needn't special maintenance, but it's long-term energized, so need messenger to
inspect regularly, especially in the thunderstorm season, after the lightning strike, it should be inspected
on time, if found that the loop signal is abnormal, removing protection gate, loop signal will be back to
normal, it means Lightning protection gate has been damaged or life has ended, replace the new lightning
protection gate on time.
5.The outside length of Coaxial line is more than 30m,it should be in the coaxial two ends with lightning
protection gate, to ensure the best lightning protection effect.
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