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Notch Filters for CATV / MATV / RF / FM Systems

Fixed and Tunable Models (0.8 to 1000 MHz)

Notch Trap Models

CATV Notches

  • Available for a center frequency from 5 to 999 MHz
  • CATV return path models have Fo and bandwidth from 5 to 60 MHz
  • CATV forward path models have Fo from 50 to 999 MHz, and bandwidth 5 to 750/870/1000 MHz
  • Filter impedance is 75 ohms with F-type connectors
  • FM Notch models for CATV include fixed and tuneable single notches with 5 to 750/870 MHz bandwidth
  • FM multiple notch for FM and ch.A5(95)-A1(99) deletion from CATV Spectrum is available: customized for exact spectrum deletion and to preserve signals

CR7-(Fo)-HQ RP

This is a highly selective, fixed frequency notch designed to attenuate a signal in the CATV return path.


CR7-(Fo)-HQ RP
Return Path Frequency Notch
  • Fo: from 2 to 40 MHz
  • Rejection: 20 to 50 dB at Fo
  • Selectivity: 3 dB BW - ± 0.25-0.75 MHz (25 dB at Fo)
  • Operating Bandwidth: 5 to 60 MHz
  • Passband Loss: 1 dB ± 0.5 dB

Example Graphs:

CR7-4.5 HQ

CR7-7.4 HQ Sub-TV Notch

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CR7-(Fo)-HQ (Fo - 50 to 400 MHz)


CR7-(Fo)-HQ
Fixed Frequency Notch

This is a highly selective, fixed frequency notch designed to attenuate a signal in the CATV system.

  • Fo: from 50 to 250 MHz
  • Rejection: 20 to 50 dB at Fo
  • Selectivity Examples:
    • 3 dB BW: ± 1.0-1.5 MHz (25 dB at Fo)
    • 3 dB BW: ± 1.5-2.5 MHz (50 dB at Fo)
  • Operating Bandwidth: 5 to 750/870 MHz
  • Passband Loss: 1 dB ± 0.5 dB

Example Graphs:

CR7-94.1 HQ

CR7-78P (special order)

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CR7-(Fo)-LQ (Fo - 5 to 1000 MHz)


CR7-(Fo)-LQ
Fixed Frequency Notch

This type of notch has less selectivity than an HQ notch and is used when high temperature stability and less selectivity is suitable. It is available for TV/FM/RF. Example graphs show double LQ notches for signal suppression for 450 MHz and 999 MHz RF system applications. Similar multiple LQ notches are use for UHF antenna bandstops and CATV semi-adjacent channel deletion filters.

  • Fo: from 5 to 1000 MHz
  • Rejection: 20 to 60 dB at Fo
  • Selectivity Examples:
    • 3 dB BW: ± 2-3 MHz (25 dB at Fo, Fo 5-50 MHz)
    • 3 dB BW: ± 3-4 MHz (25 dB at Fo, Fo 50-250 MHz)
    • 3 dB BW: ± 4-6 MHz (25 dB at Fo, Fo 250-400 MHz)
    • 3 dB BW: ± 6-7 MHz (25 dB at Fo, Fo 400-600 MHz)
    • 3 dB BW: ± 7-8 MHz (25 dB at Fo, Fo 600-800 MHz)
    • 3 dB BW: ± 8-10 MHz (25 dB at Fo, Fo 800-1000 MHz)
  • Operating Bandwidth: 5 to 750/870/1000 MHz
  • Passband Loss: 1 dB ± 0.5 dB

Example Graphs:

CR7E-999 LQ

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CR7-(Fo)-HT (Fo - 400 to 850 MHz)


CR7-(Fo)-HT
Fixed Frequency Notch

This is a highly selective, fixed frequency notch designed to attenuate a signal in the CATV system.

  • Fo: from 400 to 850 MHz
  • Rejection: 20 to 40 dB at Fo
  • Selectivity Examples:
    • 3 dB BW: ± 1.0-2.0 MHz (25 dB at Fo)
    • 3 dB BW: ± 2.5-3.5 MHz (40 dB at Fo)
  • Operating Bandwidth: 5 to 750/870/1000 MHz
  • Passband Loss: 1 dB ± 0.5 dB

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VR7-(Fo) HQ Series


VR7-(Fo) Tunable VHF/CATV Trap

Tunable VHF and CATV Trap

Frequency tunable - suppress one frequency (Fo) using two adjustable trimmers

  • Six models covering: VHF low, VHF high, FM, CATV Mid1, CATV Mid2, CATV Super
  • Rejection: > 40 dB at Fo
  • Selectivity Examples:
    • 3 dB BW: ± 1.5 MHz (Fo < 200 MHz)
    • 3 dB BW: ± 2.5 MHz (Fo < 300 MHz)
  • Bandwidth: 5-550 / 10-750 / 40-860 MHz
  • Bandwidth for FM model, VR7-FM, 5-870 MHz
  • Fo: Factory-preset; field tunable via two trimmers
  • Rejection: Individual notches are approximately 8 dB

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CR7-ch(#)P HQ and CR7-ch(#)P HT

CR7-ch (#)P HQ
Negative Trap for CATV

Negative Trap for CATV

Impair viewing of selected TV channel

  • Fo: available for CATV channels: 2 to 94
  • Rejection: >40 dB on channel’s video carrier
  • Operating Bandwidth: 0.5 - 550 / 750 / 1000 MHz
  • Example graph (CR7-ch.78P HQ)

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Tunable CATV Superband/Hyperband


Tunable CATV Superband/Hyperband

This series consists of 5 notches, each have tunable range of approximately 125 MHz: VR7-300/425 HT, VR7-425/550 HT, VR7-550/675, and VR7-675-800, and the VR7-(Fo) HT allows the user to specify an operating frequency (Fo) and notch depth for optimal selectivity.

  • Fo: from 300 to 800 MHz (UHF/Hyperband)
  • Rejection: > 30 dB at Fo
  • Selectivity Examples:
    • 3 dB BW: ± 1.25-2.0 MHz (Fo = 300 to 450 MHz)
    • 3 dB BW: ± 2.5-4.5 MHz (Fo = 450 to 650 MHz)
    • 3 dB BW: ± 3.5-4.5 MHz (Fo = 650 to 800 MHz)
  • Operating Bandwidth: 5 to 860 or 1000 MHz
  • Passband Loss: < 1 dB ± 0.5 dB
  • Fo: Factory-preset; field tunable via two trimmers
  • Rejection: Individual notches are approximately 8-11 dB

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BR7-(F1, F2 ... Fn) HQ

Custom Multiple Frequency Notches

Multiple Frequency Notches in single enclosure

  • Fo (< 350 MHz): up to seven notches
  • Fo (< 650 MHz): up to five notches
  • Rejection: >40 dB
  • Bandwidth: varies with notch tuning
  • Dimensions (in): 1.75 x 19 x 4 (rack or wall mount)
  • Multiple notches can be consolidated at one centre frequency for a wider notch bandwidth of 1 to 4 MHz
  • Example applications: multiple FM interference notches, Multiple channel negative traps.

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