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Notch Traps: Example Graphs

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Graph 1: CR7-4.5 HQ - Baseband Audio Notch

  • Graph depicts Sharp Audio Notch
  • Rejection: >40 dB at 4.5 MHz (Fo)
  • 3dB Bandwidth is ± .25 MHz (Mkr 2)
  • Video Loss: < .5dB (<1 dB at 4.2 MHz)
  • Application: install at modulator video port to prevent video interference on audio
Mkr Freq (MHz) Attn (dB)
1 0.300 -0.055
2 4.200 -0.837
3 Fo 4.50 -43.103
4 3.580 -0.038

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Graph 2: CR7-7.4 HQ SUB-TV Notch

Highly selective notch for sub-band applications.
Selectivity: 3dB BW ± 0.2 MHz

Mkr Freq (MHz) Attn (dB)
1 7.250 -2.188
2 7.400 -43.664
3 7.550 -3.136

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Graph 3: CR7-94.1 HQ (25) - FM Notch

  • Graph depicts sharp HQ Notch with >25dB rejection at 94.1 MHz (Fo)
  • 3dB Bandwidth is ± .5 MHz (Mkr 2 & 3)
  • Passband (not shown) is 10 to 860 MHz
  • Application: attenuate strong FM signal to receive adjacent FM signals
  • Models VR7-FM (tunable) and CR7-HQ (deep notch) are similar but 3dB BW is ± 1.5 MHz and 50dB attenuation
Mkr Freq (MHz) Attn (dB)
1 Fo 94.100 -28.955
2 93.500 -2.670
3 94.600 -2.423

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Graph 4: VR7-FM HT 95

Tunable FM notch with high selectivity:
± 0.35 MHz at 3 dB BW; best tuning range ± 5 MHz

Mkr Freq (MHz) Attn (dB)
1 95.000 -1.676
2 95.500 -27.672
3 96.000 -1.469

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Graph 5: VR7-HQT-99

Tunable FM Notch with ultra high selectivity:
± 0.15 MHz 3 dB BW.* Tuning range 88-108 MHz.
*User-specified Fo with ± 2 MHz fine tuning range.

Mkr Freq (MHz) Attn (dB)
1 99.000 -34.392
2 98.900 -3.465
3 99.100 -3.622

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Graph 6: CR7E-450/452 HQD

Double UHF LQ notch, CR7-Fo UHF, with broad double notches for bandstop with temperature compensation (low frequency drift).

Mkr Freq (MHz) Attn (dB)
1 450.000 -59.097
2 452.000 -57.885
3 442.000 -2.649
4 460.000 -2.079

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Graph 7: CR7E-999 LQ (Channel Eliminator)

Multiple LQ notch design for band deletion for test signal reuse.

Mkr Freq (MHz) Attn (dB)
1 996.000 -66.610
2 1002.000 -58.403
3 994.000 -33.779
4 1004.000 -32.509
5 986.000 -3.962
6 1012.000 -4.359

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Graph 8: CR7-ch. 78P HQ - Negative Trap (547.25 MHz)

  • Negative trap for CATV ch. 78
  • Rejection: >40 dB ch. 78 video carrier (Fo)
  • Designed to impair viewing of ch.78
  • Low impact on chs 77 and 79 video *
  • Passband (not shown): 0 to 750 MHz
  • Passband loss: <1dB ± .5 dB ripple
Mkr Freq (MHz) Attn (dB) Channel
1 545.750 -6.986 77 snd
2 Fo 547.250 -48.071 78 pix
*3 541.250 -1.086 77 pix
*4 553.250 -0.761 79 pix
Pix = Picture, Snd = Sound

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Graph 8: VR7 HT Tuneable Trap (611 MHz)

Graph shows selectivity (approx. 3 dB BW) of tunable UHF/Hyperband notch with Fo at 611.18 MHz.

Mkr Freq (MHz) Attn (dB)
1 611.180 -24.209
2 610.000 -2.034
3 612.180 -3.680
4 604.000 -0.334

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Graph 9: CR7-719(20) HT

Sharp UHF fixed notch at Fo 719 MHz. Signals at and beyond 716 and 722 MHz are still received with very low loss.

Mkr Freq (MHz) Attn (dB)
1 716.000 -0.534
2 722 -0.882
3 719.000 -29.378

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Graph 10: VR7-750 HT

Sharp UHF tunable notch tested at Fo 750 MHz. Signals at and beyond 748.5 and 751.5 MHz are received with low loss.

Mkr Freq (MHz) Attn (dB)
1 750.000 -39.437
2 748.500 -2.389
3 751.500 -1.862

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