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

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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

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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

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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

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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.

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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).

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Graph 7: CR7E-999 LQ (Channel Eliminator)

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

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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

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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.

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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.

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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.

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