Downstream signal level down less than 0.5dBmV, upstream return signal stayed the same +/- 0.25dBmV and signal ratio - noise stayed about the same +/- 0, 50dB. It is very good. This should be installed where your cable enters your home or office (usually outside) before the splitter (if you have one). Make sure it's plugged in and near a grounded ground lug or multi-cable provider (which are always grounded). For example, this article would be ideal if you already have a ground block and don't want to replace it with a ground block version of this surge protector (TII Network Technologies 212FF75F225-21 75 ohm Jack to Jack Lightning Coax Surge Protector - Revane: http://a .co/6h36CaN). There is also a version with a plug on the user side of the surge suppressor (TII-210 Coaxial Broadband Surge Suppressor in-line TII-210MF75F225-31 - Revain: http://a.co/ecB4W5Y). Spec Data Sheet - Just google it to find it: Built-in Coaxial Lightning Surge Protectors - Tii Technologies pdf data sheet "Tii Coaxial Gas Tube Proprietary Proprietary Surge Protector has a built-in emergency shorting mechanism for a cross-current condition that shorts the middle of the coaxial cable conductor and sheath for common path to ground DC breakdown voltage protection provides excellent protection against transient overvoltages while still being compatible with mains powered applications (including flatness): <0.3dB / 0.2dB Typical return loss: 30dB Standard protection: DC breakdown at 2000V/ s Surge at 100 V/Β΅s Insulation resistance 150-300 V ts < 450 Volt > 100 MΞ©
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