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Narrow-Band Bandpass Graphs:
NF7-4.5 (audio) , VF7- (180) , NF7-76 HQ, and NF7-721.25 HQ

Graph 1 : NF7- 4.5 ( audio ) Fixed Narrow Bandpass

NF7-4.5: Bandpass designed to pass TV baseband audio

  • Audio passband loss: < 3.5 dB
    passes baseband audio at 4.5 MHz and rejects the video band by > 30dB (Mkr 2)
  • 40dB rejection from +/-1.5 MHz Fc
  • Designed for RF modulator's audio input, prevent audio interference on video
Mkr Freq (MHz) Attn (dB)
1 4.500 -3.434
2 4.200 -34.878
3 6.000 -45.067

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Graph 2: VF7- (180) Tunable Bandpass

VF7-180: Pre-tuned passband at 180 MHz, with > 15 dB rejection of frequencies ± 3 MHz from Fc.

  • Passband loss (Fc) is < 3dB
  • Stopband: >15 dB ( Mkr 2 & 3 )
  • Rejection: > 40dB from ± 15 MHz Fc
  • Tunable range: 170 MHz to 190 MHz
Mkr Freq (MHz) Attn (dB)
1 Fc 180.00 -2.727
2 177.00 -15.778
3 183.00 -15.667
4 166.00 -41.033
5 192.00 -40.198

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Graph 3: NF7-76 HQ Fixed Bandpass

NF7-76 HQ: Very narrow Data Carrier Bandpass

  • Data carrier bandpass between chs 4 and 5
  • Pass 76 MHz - passband < .75 MHz
  • Stopband: >20 dB ± 1.5 MHz Fc
  • Rejection: > 40dB from ± 5 MHz Fc
  • Factory retunable
Mkr Freq (MHz) Attn (dB)
1 Fc 76.000 -3.186
2 74.500 -22.038
3 77.500 -22.068
4 71.000 -44.029
5 81.000 -41.059

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Graph 4: NF7-721.25 HQ Fixed Narrow Bandpass

NF7-721.25 HQ: CATV Channel 112 video bandpass

  • Pass mainly 721.25 MHz (ch.112 video carrier) for CATV system measurements
  • Stopband: > 20 dB ± 5 MHz Fc
  • Rejection: > 40dB ± 20 MHz Fc (approx)
  • Ch.112 audio carrier (725.75) is attenuated by 20 dB
Mkr Freq (MHz) Attn (dB)
1 Fc 721.25 -4.427
2 716.25 -20.073
3 726.25 -21.600
4 703.00 -40.825
5 737.00 -41.349

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