NF-471: Notch Filter

The Nortek Security & Control Family of Brands

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 blocks the modulated signals from being broadcast back into the coax. The NF-471 is a perfect solution for modulation in the ever-increasing bandwidth taken up by Cable Television (CATV).

The Model NF-471 Notch Filter blocks incoming CATV channels 75-80 and off-air UHF TV channels 24-29, allowing 5400, 5500, and SVM series modulators to insert TV channels without interference.

NOTE: To avoid interference, be sure there’s an empty channel on each side of a modulated channel.


  • Notch filter frequency 529.25 MHz to 559.25 MHz
  • Rejects CATV channels 75 to 80
  • Allows insertion of CATV channels 76, 77, 78, & 79
  • Rejects off-air UHF TV channels 24 to 29
  • Allows insertion of UHF TV channels 25, 26, 27, & 28
  • 3.25″ L x 1 W”

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