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If you want to use a modulator to view surveillance footage on a specific UHF or CATV channel from any television in your home, youll need access to one or more empty channels. If you cant find an empty channel, you can block CATV channels 70-74 and off-air UHF TV channels 19-23, thus allowing modulators to insert a channel without interference. With this notch filter in place, you can create two modulated channels (71 & 73) on CATV and two channels (20 & 22) on UHF.
Inserts locally generated modulated channels by blocking certain channels
The Model NF-471 Notch Filter couples the incoming signal source
coax cable to the input on a splitter or bi-directional DA-series amplifier. Once installed, the NF-471 filters out channels to make room for modulated channels. In addition, the NF-471 ...
Negative and positive traps are the most commonly used method
for pay television security. Negative traps block the video signal from entering the subscriber’s home. Positive traps decode a scrambled channel.. Features. Upper Frequency Response:. 50mHz). Impedance: 75 Ohms. ...
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