Notch Filters for CATV / MATV / RF / FM Systems

Fixed and Tunable Models (0.8 to 1000 MHz)

Select A Category ... Off-Air/RF FM CATV General Description Table & Graphs Specifying Your Notch

Notch Trap Models

Off-Air Antenna Notches

• Off-air notches can have centre frequency 40 to 800 MHz
• Used to selectively attenuate desired frequencies to improve reception
• Bandwidth for VHF 40-250 MHz or VHF/UHF 40-250/470-800 MHz, or 40 to 800 MHz
• Models are available for 75 ohms (F, BNC) or 50 ohms (BNC, N)
• Indoor and outdoor enclosures available

RF Notch Filters (Custom): 0.8 to 1000 MHz, 75 or 50 ohms

• RF notch center frequency can be specified from 0.3 to 900 MHz
• Filter port impedance can be 75 ohms or 50 ohms (user-specified)
• Available with a variety of connector options: F, BNC, SMA, or N
• Details RF notch specifications - please refer to CATV and Off-Air TV/FM models
• Custom multiple notches for multi-frequency attenuation (seperate or contiguous) available

VR7-(Fo) HQ Series

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
• Fo: Factory-preset; field tunable via two trimmers
• Rejection: Individual notches are approximately 8 dB

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CR7-HT Series UHF Adjacent Friendly Notch and Bandstop

The CR7-HT series notches and bandstops are designed for TV/RF signal interference applications in the UHF/RF band up to 1000 MHz. These filters have high frequency selectivity and are suitable for adjacent channel applications.

• Fo: from 400 to 900 MHz
• Rejection: 15 to 65 dB at Fo
• Selectivity Examples:
  • 3 dB BW: ± 1.0-1.5 MHz (25 dB at Fo)
  • 3 dB BW: ± 2.0-3.5 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-(UHF) HT

This series of notches is generally used to selectively attenuate one (or two) UHF signals. The VR7-470/600 HT, VR7-600/700 and VR7-700/870 HT models act on a preset UHF frequency range, whereas the VR7-(Fo) HT allows the user to specify an operating frequency (Fo) and notch depth for optimal selectivity.

• Fo: from 400 to 900 MHz (UHF / Hyperband)
• Rejection: >30 dB at Fo
• Selectivity Examples:
  • 3 dB BW: ± 2.0-3.5 MHz (Fo = 470 to 600 MHz)
  • 3 dB BW: ± 3.5-4.5 MHz (Fo = 600 to 800 MHz)
• Operating Bandwidth: 5 to 860 or 1000 MHz
• Passband loss: < 1dB ± .5 dB

Example Graphs:

VR7-611 HT

VR7-750 HT

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CR7-(Fo) UHF HT

"Adjacent Friendly" UHF Single Notch - attenuate UHF frequency (Fo)

• Specify Fo: available from 400 to 800 MHz (UHF/Hyperband)
• Rejection: > 25 dB at Fo
• 3 dB BW: ± 1.0-1.5 MHz (Fo = 400 to 700 MHz)
• 3 dB BW: ± 1.5-2.5 MHz (Fo = 700 to 900 MHz)
• Operating Bandwidth: 5 to 800 or 1000 MHz
• Passband loss: 1 dB ± 0.5 dB

Example Graphs:

CR7-719(20) HT

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CR7D-(Fo) UHF HT

Fixed frequency UHF Double Notch - two >25 dB notches,or, one >50 dB notch, or, 4-6 MHz bandstop with high selectivity (Fo)

• Specify Fo: available from 400 to 800 MHz (UHF/Hyperband)
• Rejection: > 25 dB at Fo
• 3 dB BW: ± 1.0-1.5 MHz (Fo = 400 to 700 MHz)
• 3 dB BW: ± 1.5-2.5 MHz (Fo = 700 to 900 MHz)
• Operating Bandwidth: 5 to 800 or 1000 MHz
• Passband loss: 1 dB ± 0.5 dB

Example Graphs:

CR7-719(20) HT

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CR7-(Fo)-HQU and VR7-(Fo)-HQU:

UHF Frequency Notch

Fixed frequency and tunable Single Notch - attenuate UHF frequency (Fo)

Fixed frequency model CR7-(Fo) HQU notch specifications:

• Fo: from 400 to 900 MHz (UHF/Hyperband)
• Rejection: >25 dB at Fo
• 3 dB BW: ± 6.0-8.0 MHz (Fo = 400 to 550 MHz)
• 3 dB BW: ± 8.0-12 MHz (Fo = 550 to 900 MHz)
• Operating Bandwidth: 5 to 860 or 1000 MHz
• Passband loss: < 1dB ± 0.5 dB

Tunable frequency model VR7-(Fo) HQU notch specifications:

• Rejection: > 25 dB at Fo
• 3 dB Bandwidth: ± 6.0 - 12 MHz (Fo = 400 to 800 MHz)
• Bandwidth: 5 to 860 MHz
• Fo is factory preset and tunable via two trimmers (T1 and T2)
• Rejection: individual notches are approximately 7 to 15 dB

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MQ7-(Fo)

Notch with on/off Switch

Single Notch w/ switch traps specific frequency (Fo) ...

• Fo: available from 4 to 450 MHz
• Rejection: >40 dB at Fo (manual "on/off" switch)
• Passband (trap "off"): 5 to 550/750/900 MHz

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CR7-ch (#)s

Sound Trap (adjustable)

Adjust TV channel sound level (trap from 6 to 40 dB)

• Channels available: CATV 2 to 36 (MATV / SMATV)
• Reduce sound interference on upper adjacent picture
• Bandwidth: 5 to 550 /750 MHz
• Low impact to on-channel colour carrier

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CR7-MQ-ch.(#):

Double Frequency Trap

Two 40 dB notches on TV channel’s picture & sound

• Designed to suppress adjacent channel interference off VHF antenna; suitable as negative trap
• Channels available: 2 to 36 (VHF / CATV)
• Selectivity: < 3dB loss on adjacent carriers
• Bandwidth: VHF, VHF/UHF, or CATV 550/750 MHz
• Custom frequencies available

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MQ7-ch.(F1 & F2):

Double Notches with Switches

Notch with one or two "on/off" switches. Specifications similar to model CR7-MQ, Application examples:

• MQ7-60/80 - TI filter: 60 and 80 MHz notches for satellite IF
• MQ7-2S6P - Montreal Trap - reject ch.2 audio and ch.6 video to allow viewing of adjacent chs 3 and 5

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

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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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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HQ3-(Fo) HQ

300 Ohms Notch

300 ohms Notch with input/output impedance ...

• Fo: available from 50 to 250 MHz
• Rejection: > 40 dB at Fo
• Custom notch depth: specify between 15 to 40 dB
• Selectivity (3 dB BW): ± 1.5 MHz
• Passband loss: < 2 dB typical
• Bandwidth (MHz): VHF, VHF/ UHF (40-230/450-860)
• Connectors: 300 ohms terminal strips