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Color Sub-Carrier Band Reject  & Bandpass Filters

Color Sub-Carrier Filters
VFR Band Reject, VFB Bandpass 

  • VFR and EVFR Band Reject Filters   click here for printable datasheet
  • Band Reject Filters are Notch Filters - Designed to Remove the 3.58 MHz Sub-Carrier from NTSC Color Signals
  • Applications Based on Rejection of the Color Information in the Video Signal to Provide Isolation from the Luminance Signal

Sub-carrier rejection filters are notch filters designed to remove the 3.58 MHz sub-carrier from NTFC color signals. Most applications for this type of filter are based upon rejection of the color information in the video signal to provide isolation from the luminance signal. This application requires low phase distortion to the luminance signal. To satisfy this requirement, we have designed the VFR series of filters. One of the most often used applications for this filter is in color systems for monochrome transmissions to prevent color flashes from appearing on the screen. Since various segments of the television industry have different bandpass requirements, filters of different bandwidth are offered. Where required, phase correction is included. The photographs of the 20T pulse show the reduced picture definition the wider the bandwidth. Equipment manufacturers can use the encapsulated P.C.B. versions - Series EVFR.

Impedance = 75 Ohms
Maximum Insertion Loss =  3 dB at 100 KHz
Maximum Passband Ripple to 5.5 MHz = .125 dB, .25 dB for VFR1P3
Size: 4" x 2" x 1-1/4" in metal cans with BNC Connectors. Add 'E' to Part Number for Encapsulated Models
EVFR Size: 4" x 2" x 1-1/4"
Delivery from Stock
NTSCNTSC Band Reject

Series VFR Performance

VFR and Encapsulated EVFR Series
 

Part Number

Max. 3 dB
Attenuation 
@ Frequency
(MHz)

Min. 45dB
Attenuation 
@ 3.58 (MHz)

VFR4P6 1.95-6.55 40 dB
VFR1P3 3.00-4.30 40 dB
VFR0P5 3.37-3.88 40 dB

  • VFB & EVFB Bandpass Filters
  • Low Distortion Unit Designed to Attenuate the Luminance Information in Color TV Signals
  • Applications Requiring Isolation of the Chrominance Information

Allen Avionics Sub-Carrier Bandpass filter is a low distortion designed to attenuate the luminance information in color TV signals. This filter is used in most applications where it is required to isolate the chrominance information. Equipment manufacturers can use the encapsulated P.C.B. versions - Series EVFB.

Impedance = 75 Ohms
Maximum Insertion Loss =  3 dB at 300 KHz
Maximum Ripple = 0.1 dB
Size: 4" x 2" x 1-1/4" in metal cans with BNC Connectors. Add 'E' to Part Number for Encapsulated Models
EVFB Size: 3" x 2" x 1-1/8"
Delivery from Stock
NTSC Bandpass Filter
Model VFB3P6

Series VFB Performance

VFB and Encapsulated EVFB Series
 

Part Number

Max. Ripple

Max. Insertion Loss 
@ 3.58 (MHz)

VFB3P6 0.1 dB 1.5 dB

 
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Allen Avionics, Inc.
2727 Clinton Street
River Grove, IL  60171
Phone: (708)-453-3238
Fax: (708)-453-0297
E-Mail: Sales@AllenAvionics.com

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