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Cable TV In-Line Coaxial Surge Protector
How does this device shunt a surge with no apparent ground connection?
One would think that surge protection would require a heavy ground in order to carry the energy of the surge away from the device and the equipment it is protecting. How is protection achieved?
This is a surge protector, not a grounding block. There are some, like the TII 212 that serve as both a grounding block and a surge protector. Per National Electrical Code you're required to have a grounding block at the point where the cable enters the home, tied to both a ground rod and your ground point at the mains entry. Ideally you'd also have one at the antenna if it's remote from that location. You're not required to have a surge protector at all. Again, if you search you'll find that the grounding block is intended to dissipate static build up and a potential lightning strike directly to ground. However, there's still the potential for a large voltage on the center conductor. A surge protector (traditionally a gas discharge device, which is what other sites indicate this is, NOT a MOV -- I haven't found any inline MOVs, although the power strip versions may use MOVs) is needed to shunt high voltages on the center conductor to the shield and hopefully protect your device. The grounding block is intended to keep your house from burning down and should be there regardless of whether or not you use a surge protector. However, it won't protect your electronics from being fried. A surge protector MIGHT.You generally want the protector between the surge and the device, so it's likely to be of most benefit connected near the device it's protecting. And since this is a voltage breakdown device, meaning that the voltage must reach a certain point before it conducts and shorts out the current, having multiple units inline typically won't provide "more" protection, unless of course one of the units fails and the other takes the surge. Just be aware that each one adds more loss to the system, reducing your received signal level.
Date published: 2013-06-10
What is the RF loss?
THe -Insertion Loss: Less than 0.2 dB Video-1500 MHz -Return Loss ( 75 ohm):16dB
Date published: 2013-04-24
What's the frequency range?
The previous question on the loss gives an answer for loss to 1500 MHz, but other sites list this same part (including PE model) as covering 5-2300 MHz.
The specs on current stock are below:Current stock Surgender SE-1 specs- Surge Protection Attack Time:0.0000001 seconds (100 nanosec.) -Maximum Surge Current: 5000 Amps. (8 microsec x 20 microsec test pulse) -Maximum Surge Voltage:Multiply 5000 times Ohms of Coax Loop -Surge life: 200 Surges of 500 Amps. (10 microsec x 1000 microsec test pulse) -Normal Resistance Across Coax: 10,000 Mega Ohms -Surge Resistance: Approx. 0 Ohm -Power Passing Capability:50 Volts DC or AC peak-to-peak 36 Volts RMS, 10 Amps -Insertion Loss: Less than 0.2 dB Video-1500 MHz -Return Loss ( 75 ohm):16dB (VSWR 1.38) Video to 500MHz -14dB (VSWR 1.38) 500 to 1500MHz -Connectors: F Fmale to F Female -Dimensions:1.385"L x 0.815"DIA.
Date published: 2013-06-10