This Low Pass Filter passes CATV 2-116, blocks CATV >121, passes off-air 2-60, blocks off-air 65-69. Low Pass Filters are necessary whenever you want to create your own channels with modulators. These units will filter out frequencies above a certain point so that your channel can be distributed throughout your video distribution system without interference from the cable company. Channels below the filter's rating will come through without attenuation. It will remove cable system noise, test and monitoring signals from the cable company, and signals for cable modems.
Additionally, the filter will keep your modulated signals from traveling back down the cable and into your neighbor's homes. A side benefit is that it could block some channels that parents find objectionable. The filter will not effect channels 95 to 99 on cable systems. In some cases, where the signal strength on existing channels to be blocked is high, two filters in series may be necessary to completely block the signal.
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