783 Series High Power FM Band Pass Filter

780 Series Medium Power Bandpass Filter; High stability temperature compensated cavities; Standard port configurations- 1 5/8 inch EIA, 3 1/8 inch EIA, 4 1/16 inch, 6 1/8 inch EIA; Copper/brass construction with stainless steel hardware (critical components are silver plated); Increased power capability up to 60 kW with appropriate port configuration and forced air cooling.

Description

783 Series High Power Bandpass Filter; High stability temperature compensated cavities; Standard port configurations- 3 1/8 inch EIA, 4 1/16 inch, or 6 1/8 inch EIA; Copper/brass construction with stainless steel hardware (critical components are silver plated); Increased power capability up to 35 kW with appropriate port configuration and forced air cooling; Air cooling system requires approx. 2 square feet of floor space; Easily assembled floor standing units (hardware for ceiling suspension available on request or optional vertical floor stands); Factory tuned to customer’s specified channel, yet can be easily field converted to any FM channel; Minor adjustments of cavity resonant frequency can be made during full power operation of filters.

Features and Benefits

  • Cylindrical construction provides better mechanical and electrical stability than square or rectangular cavities.
  • Factory tuned to customer’s specified channel, yet can be easily field converted to any FM channel.
  • Minor adjustments of cavity resonant frequency can be made during full power operation of filters.
  • High stability temperature compensated cavities.
  • ERI filters are loop coupled and fixed with bolted connections to couple cavities.
  • No Teflon or other insulating material used in the coupling between cavities, eliminating a primary point of failure, present in competitor’s designs.
  • Loop coupling provides an adjustment (without disassembly) at the input and output of each cavity
  • Marman clamp connection allows close cavity placement.
  • Ability to change frequency quickly and with a minimum of disassembly.
  • Filter can be easily broken down for shipment and placement
  • Temperature indicator provided on all filter sets
  • Optional non-adjacent coupling and group delay compensation available
  • Easily assembled floor standing units (hardware for ceiling suspension available on request).

Specifications

  • Band:
    FM
  • Frequency Range:
    88 to 108 MHz
  • Number of Cavities:
    Three (3) or Four (4)
  • Power Handling:
    20 kW convection cooled
  • 35 kW with optional forced air cooling
  • Mounting Configurations:
    Floor or optional vertical floor stands
  • Insertion Loss
    < 0.4 dB at ± 150 kHz
  • VSWR:
    < 1.1:1 at ± 150 kHz
  • Group Delay:
    < 75 ns overall variation ± 150 kHz carrier
  • < 25 ns with optional group delay compensation

Models Available:

  • 783-3
    ERI Model 783-3 FM Band Pass Filter, three cavities, floor mounted, convection cooled. Temperature compensated filter with temperature indicator.
  • 783-3A
    ERI Model 783-3 FM Band Pass Filter, three cavities, floor mounted, forced air cooled. Temperature compensated filter with temperature indicator.
  • 783-4
    ERI Model 783-4 FM Band Pass Filter, four cavities, floor mounted, convection cooled. Temperature compensated filter with temperature indicator.
  • 783-4A
    ERI Model 783-4 FM Band Pass Filter, four cavities, floor mounted, forced air cooled. Temperature compensated filter with temperature indicator.

Product Brochure

783-3 FM Band Pass Filter Brochure

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783-4 FM Band Pass Filter Product Brochure

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