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FM Filters & Traps (88 MHz - 108 MHz)





FM Narrow-Bandpass Filters

NF7 and VF7 Series Fixed and Tuneable Narrow FM Bandpass

These filter pass a very narrow portion of FM band and attenuate all out-of-band carriers.


NF7-FM-HQ
Dim 4.25"L x 4"H x 1.75"W

NF7-FM-HQ Passband: <1.5 MHz

  • HQ Double Helical resonators design
  • Passband: specify frequency (Fc): 88-108 MHz
  • Insertion loss (Fc) : < 2.5 dB; Return loss: >18 dB
  • Selectivity: > 20 rejection ± 2.0 MHz from Fc
    > 40 rejection ± 6 MHz from Fc
  • Operating bandwidth: 5 to 800 MHz
  • Factory re-tunable ( 88 to 108 MHz )
  • See also CATV filters "Narrow Bandpass"

NF7-FM
Dim 3.6"L x 2.5"H x 3.2"W

NF7-FM Passband: < 2 MHz wide (HQ LC circuits)

  • Fixed Passband: user specify FM frequency (Fc)
  • Insertion loss (Fc) : < 3.5 dB
  • Return loss: >16 dB
  • Stopband: > 25 dB rejection ±3 MHz from Fc
  • Operating bandwidth: 5 to 750 MHz

VF7-FM LC Passband (<2 MHz wide)


VF7-FM LC

PDF Info Sheet

  • Factory pre-tuned (98 MHz or user-specified)
  • Insertion Loss (Fo): <2.75 to 3.5 dB (from 88 to 108 MHz)
  • Return Loss: 12 to 18 dB
  • Selectivity: >20 dB rejection ±2.5 to 4 MHz from Fc
  • Operation bandwidth: 5 to 1000 MHz
  • Tunable via three capacitive (mechanical) screw trimmers
  • Connectors: F-type, 75 ohms (standard)
  • Optional connectors: 50 ohms - BNC, SMA, N; 75 ohms - BNC


VF7-FM Frequency tunable narrow FM band pass: 1.5 MHz BW


VF7-FM
Dim 4.25"L x 4"H x 1.75"W

PDF Info Sheet

  • Factory pre-tuned (98 MHz or user specify)
  • Insertion loss (Fo): <3.0 to 2.5 dB (from 88 to 108 MHz)
  • Return loss: >16 dB
  • Selectivity: >20 dB rejection ±2 MHz from Fc
  • Operating bandwidth: 5 to 250 MHz
  • Tunable via two capacitive (mechanical) screw trimmers




VF7-FM-HR3 Frequency tunable narrow FM band pass: 1 MHz BW



VF7-FM-HR3
Dim 7.5"L x 4.5"H x 2.0"W

PDF Info Sheet

  • High Selectivity: >25 dB rejection ±1.5 MHz from Fc
  • Factory pre-tuned (99 MHz or user specify (Fo))
  • Tunable range 88 to 108 MHz
  • Insertion loss (Fo): <3.25 to 2.75 dB (from 88 to 108 MHz)
  • Return loss: >16 dB
  • Selectivity: >15 dB rejection ±1-1.25 MHz from Fc
  • Selectivity: >60 dB rejection DC-80 MHz; 120-1000 from Fc
  • Operating bandwidth: 5 to 1000 MHz
  • Tunable via three capacitive (mechanical) screw trimmers




VF7-FM-HQT Frequency tunable narrow FM band pass: 0.5 MHz BW






VF7-FM-HQT
Dim 7.0"L x 4.5"H x 3.75"W

PDF Info Sheet

  • Highly selective single channel FM band pass filter
  • Tunable range 88 to 108 MHz, factory pre-tuned (99 MHz or user specify)
  • Insertion loss (Fo): <3.5 to 4.0 dB (from 88 to 108 MHz)
  • Return loss: >18 dB (at 98 MHz), 14 dB at 108 MHz, 12 dB (at 88 MHz)
  • Insertion Loss and Return loss can be optimized at User specified Fo
  • Selectivity: Fo +/-1 MHz rejection >25 dB; Fo +/-2 MHz >40 dB rejection
  • Rejection >55 dB 5-80 MHz, 115 to 400 MHz
  • Operating bandwidth: 5 to 400 (optional 1000 MHz)
  • Frequency tunable via two capacitive (mechanical) screw trimmers




Example Graphs

NF7-FM HQ NF7-FM, VF7-FM, Order Info

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Full FM Bandpass models: BP7-FM and BP7-FM/6

BP7-FM (Passband: 88 to 108 MHz)


BP7 FM
Dim 1.75"H x 19"L x 3"D

PDF Info Sheet

  • Designed to pass FM band only
  • Suppress all signals outside of FM band - prevents FM interference on TV band
  • Lower stopband excludes ch. 6 audio
  • Operating bandwidth: 5 to 860 MHz
  • Stopband: > 50dB (5 - 83 MHz & 115 - 860 MHz)
  • Passband loss: 2dB, and 3dB at band edges

BP7-FM/6 ( Pass 90 to 108 MHz/ Reject ch. 6 )

BP7 FM/6
Dim 1.75"H x 19"L x 3"D

PDF Info Sheet

  • Filters FM band for TV/FM systems
  • Operating bandwidth 5 to 860 MHz
  • Prevents FM interference on TV band and ch. 6
  • Stopband ch.6: >40 dB ( 83.25 to 87.75 MHz )
  • Stopband > 50 dB (5 - 83 MHz & 115 - 860 MHz)
  • Passband loss: < 2.5 dB, and loss at band edges - 4dB at 90 MHz and 3 dB at 108 MHz (see graph)

Example Graphs

BP7-FM/6 and Order info

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Sharp FM Frequency Notches: (Fixed & Tuneable)

VR7-(Fo) HQ Series

Tunable VHF/CATV/FM 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

VR7-(Fo)
Tunable VHF/CATV Trap
  • 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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FM Notches (75 ohms, F-connectors, Optional 50 ohms - BNC or N connectors)

FM notch filters are available with five levels of selectivity. Designed to suppress one FM frequency and pass all other signals with low to minimal loss to adjacent carriers. The notches apply for user-specified FM frequencies (Fo).

CR7- (Fo) HQ (25) - 25 dB Fixed Notch


CR7-(Fo) HQ (25)
Dim: 3.6"L x 2.5"H x 3.4"W
  • Attenuation: 25 dB or less (see graph)
  • Selectivity: 3dB bandwidth is ± 0.5 MHz
  • Bandwidth (MHz): 40 - 220 / 8 - 560 / 10 - 860

CR7- (Fo) HQ (50) > 50 dB Fixed Notch


CR7-(Fo) HQ (50)
Dim: 3.6"L x 2.5"H x 3.4"W
  • Attenuation: > 50 dB attn
  • Selectivity: 3dB bandwidth is ±1.25 MHz.
  • Bandwidth: 50 to 220 MHz, or 8 to 550 / 750 MHz.

CR7- (Fo) HT >30 dB Sharp Fixed Notch


CR7-FM HT
  • Attenuation: > 25 dB
  • Selectivity: 3 dB bandwidth is ± 0.25 MHz
  • Bandwidth: 50 to 220 MHz



VR7-FM - Tunable FM Notch

  • Consists of two tuneable 8 dB notches
  • Combined attenuation: > 40 dB
  • Selectivity: 3dB bandwidth is ± 1.5 MHz
  • Bandwidth: 50 to 220 MHz or 8 to 550 / 750 MHz

Example Graphs

CR7-88.6 HQ (25) and Order info

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VR7-FM HT - Sharp, Tuneable FM Notch


VR7-FM HT

PDF Data Sheet

  • Sharp and Tuneable FM filter with 88 to 108 MHz tuning range
  • Attenuation: User-specified (from 20 to 40 dB)
  • Fo is tuneable via two trimmers
  • Example selectivities:
    • 25 dB notch: 3dB bandwidth is ± 0.35
    • 40 dB notch: 3dB bandwidth is ± 0.75
  • Bandwidth: 50 to 250 MHz

Example Graphs:

VR7-FM HT 95





VR7-FM HQT, VR7-FM HQTA - Ultra-sharp, Tunable FM Notch

  • Ultra-sharp FM frequency notch
  • VR7-FM-HQT notch can be easily tuned through the FM band using two tuners
  • VR7-FM-HQTA can tune through the FM band using two tuner, and fined tuned (fo +/- 0.1 MHz) with two additional tuners
  • Tunable from 88 to 108 MHz
  • Optimal range is Fo ± 3 MHz
  • Attenuation: User-specified (from 20 to 40 dB)
  • Example Notch selectivity:
    • 20 dB notch: 3dB bandwidth is ± 0.1 MHz
    • 40 dB notch: 3dB bandwidth is ± 0.2 MHz
  • Bandwidth: 50 to 200 MHz

Example Graphs:

VR7-HQT 99




Multiple FM Notch Filter

  • VR7-2501-8 and VR7-FM-8-HT Tunable, Sharp, Multiple FM Notch Filter
  • Custom Multiple notches to attenuate FM signals at specific frequencies.
  • Model VR7-FM-8-HT is frequency tunable with eight individual notches - selectivity: 0.25 MHz 3dB BW (10 dB notch depth)
  • Model VR7-FM-2501-8 is frequency and notch depth tunable with eight individual notches - selectivity: 0.35 3dB BW (12 dB notch depth)


    VR7-FM-2501-8




    PDF Data Sheet

    • Sharp Multiple FM notch filter with 88 to 108 MHz retuning range
    • User specified notch frequencies between 88 to 108 MHz
    • The number of notches that can be cascaded is up to sixteen
    • Attenuation: User-specified (10 dB to 20dB per notch)
    • Combined Attenuation: Combined notches attenuate signal up to 100 dB
    • Notch frequency and notch depth are tunable via two screw trimmers
    • Bandwidth: 5 to 200 MHz for FM only system
    • Bandwidth: 5 to 1000 MHz for OTA/CATV systems
    • Applications include:
      • Attenuate multiple interfering FM signals
      • Equalize Broadband FM signal for distribution
      • Specific FM spectrum rejection - up to 2 MHz
    • More details -
    • PDF Data Sheet VR7-FM-2501-8

      PDF Data Sheet VR7-FM-8 HT


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    Antenna FM Bandstop and Bandpass (MATV models)

    CR7-CH.FM - Bandstop:


    CR7: indoor unit
    Dim 3.6"L x 2.5"H x 3.4"W

    PDF Info Sheet

    • Designed to prevent FM broadcast interference on off-air TV antenna systems
    • Standard attenuation: 40 dB (from 88 to 108 MHz, but ch.6 will not pass)
    • Passband: DC-83, 115 to 800 MHz
    • Frequency-shifted stopband (e.g.: 91 to 108 MHz) is available to pass ch.6
    • Available in outdoor enclosure
    • Available in 50 ohms with BNC or N connectors

    CF7-CH.FM - Bandpass:

    CF7: indoor unit
    Dim 3.6"L x 2.5"H x 3.4"W

    FM band-pass filter - good out-of-band rejection. Low insertion loss. Can be custom tuned to reject ch.6. CF7-FM (91-108).

    • Designed for TV antenna to pass FM band only
    • Passband loss: 1.5 dB (88 to 108 MHz)
    • Stopband Rejection: > 30 dB from 0 to 82 MHz, and 115 to 860 MHz
    • Passband can be shifted to pass 92 to 108 MHz, and ch.6 can be attenuated by -20 dB
    • Available in outdoor enclosure
    • Available in 50 ohms with BNC or N connectors

    Example Graphs

    CR7-ch.FM, CF7-ch.FM

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    FM combiners: CMN7-FM

    CMN7-FM

    Custom FM channel combiner or divider. CMN7-FM consists of individual FM bandpass filters joined together at one common port.


    CMN7-FM
    Dim 5.25"L x 9.5"W x 2.25"H

    PDF Info Sheet

    8 Input combiner Info Sheet

    • Available for 2, 3, 4 up to 8 channels (88 to 108 MHz)
    • FM channels are specified (Fc1...Fc4)
    • Total power handling: 40 watts max
    • 10 watts per channel for four channel
    • FM carrier loss: < 2dB (channel separation >3 MHz)
    • FM carrier loss: < 3dB (channel separation >2 MHz)
    • Selectivity: > 25dB rejection ±3 MHz Fc
    • Isolation between FM channels: > 25dB (channel separation > 3 MHz)
    • Connectors: 75 ohms F (female) *

    * Connectors/Impedance options: 75 ohms BNC, 75 ohms N, 50 ohms N or 50 ohms BNC

    Example Graphs

    Example: CMN-4 (88/91/94/97) FM

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    FM signal Splitters (88-108 MHz, 50 ohms)

    S7-2FM B50 and S7-4FM B50 (Two-way, Four-way, Ten-Way splitters)



    S7-2FM B50 - 2-way splitter



    S5-4FM B50- 4-way


    S5-10FM N50- 10-way


    • High quality, 50 ohms, FM signal splitters
    • Available with 2 to 10 outputs
    • Splitter loss: 3.5 dB (two-way), 7 dB (four-way) 12 dB (10-way)
    • Isolation between Outputs: >25dB
    • Impedance matched: 50 ohms (>25 dB R.L. outputs)
    • Impedance matched: 50 ohms (>18 dB R.L. Input)
    • Connectors: BNC (F/F) (Optional connectors available: sma, N,TNC)

    • PDF S7-2FM, S7-4FM Info Sheet

      PDF S5-FM10 10-way splitter Info Sheet





    FM/TV band Separator/Combiners

    S7-TV/FM and S7-TV/FM/6






    S7-TV/FM

    Dim 7.0"L x 2.0"W x 2.5"H

    • High quality, Over-the-Air TV/FM band separator/combiner
    • S7-TV/FM: TV port ch. 2-5, 7-13, 14-69 ; FM port 88-108 MHz
    • S7-TV/FM/6 TV port ch. 2-6, 7-13, 14-69 ; FM port 92-108 MHz
    • Combination low loss FM bandpass and sharp 40dB FM bandstop
    • FM bandpass -1dB loss to FM signals,and, >55 dB rejection of VHF Hi-UHF TV signals
    • FM bandstop -1dB loss to TV signals,and, >40dB attenuation of FM signals
    • Separation of TV and FM band has typical 1dB loss, lower loss than RF splitter 3.5 dB
    • PDF S7-TV/FM Info Sheet


    S7-TF





    S7-TF

    Dim 4.0"L x 2.0"W x 2.5"H

    • Over-the-Air TV/FM band separator/combiner (50-800 MHz)
    • S7-TV/FM: TV port ch. 2-5, 7-13, 14-69 ; FM port 88-108 MHz
    • Combination low loss FM bandpass and 20dB FM bandstop
    • FM bandpass -1.5dB loss to FM signals,and, >25 dB rejection of VHF Hi-UHF TV signals
    • FM bandstop -1dB loss to TV signals,and, >20dB attenuation of FM signals
    • S7-TF has approx. 1dB thru loss, lower loss in comparison to RF splitter 3.5 dB
    • Available with F 75 ohms ports
    • PDF S7-TF Info Sheet



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    FM Band Matching Transformers (50 to 75 ohms)

    MT-50/75-FM BfFf
    Connectors: BNC female/F female/F

    Dim:3.5"L x 0.75"D x 1.75"H

    PDF MT-50/75-FM

    PDF MT-50/75 General Info

    MT- 50/75-FM (FM Band: 80 to 120 MHz)

    MT-50/75 (FM) is modified version of MT-50/75. It is designed to impedance match 50 ohms FM antenna to 75 ohms receiving equipment. The MT-50/75-FM will optimize signal transfer, prevent impedance mismatch and reduce signal reflection.

    • Passband optimized for FM band (pass 10 to 700 MHz)
    • Thru Loss (80 120 MHz): <0.5 dB
    • Return loss is optimized for FM 75 ohms port: >35 dB (VSWR 1.04);
    • Return loss is optimized for FM 50 ohms port: >30 dB (VSWR 1.06);
    • Connectors: 50 ohms BNC (female) and 75 ohms F-type or BNC (female)
    • Rugged, compact casing
    • Connectors available for 50 ohms port include: sma. BNC, TNC and N type (female or male)
    • Connectors available for 75 ohms port include F, BNC (female or male), and N type female)
    • Power Handling: 20 Watts; Operating Temperature: -30C to +40C

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    Outdoor Antenna Preamplifiers

    MA-20-77-ch.FM


    MA-20-77-ch.FM

    High quality FM antenna preamplifiers, designed to optimize FM signal reception from the TV antenna to the TV or Headend by providing a stronger signal with improved signal quality.

    • Designed for reliable performance
    • Bandpass filtered for FM reception
    • Low noise figure (3.5 dB) for better FM reception
    • Low power consumption & static discharge
    • UL approved remote indoor AC power adapter
    • 75 ohm models have F-type connectors (F/F)
    • Click > Table: Preamplifiers

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    Indoor FM Distribution Amplifiers

    TA-25-FM, TA-36-FM, TA-45-FM

    TA-45-FM TA-45-FM

    PDF Info Sheet

    High quality FM distribution amplifiers designed to optimize FM signal distribution, providing a stronger signal with improved signal quality.

    • Designed for reliable performance
    • Available with 25 dB (TA-25-FM), 36 dB and 45 dB gain
    • Bandpass filtered for FM operation (>14 dB R.L. Input/Output)
    • Optional ch 6 rejection and FM frequency shift 91-108 MHz for CATV systems
    • Low noise figure (3.5 dB) for better FM distribution
    • Low power consumption & static discharge
    • UL approved remote indoor AC power adapter
    • 75 ohm models have F-type connectors (F/F)
    • Option: 50 ohm models with BNC or N connectors

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