Description

780 Series Medium Power Bandpass Filter; High stability temperature compensated cavities; Standard port configurations- 1 5/8 inch EIA and 3 1/8 inch EIA; Copper/brass construction with stainless steel hardware (critical components are silver plated); Increased power capability up to 10 kW with appropriate port configuration and forced air cooling; Air cooling system requires electrical power source; Easily assembled floor standing units (hardware for ceiling suspension available on request or optional vertical floor stands are available); 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:
  5 kW, convection cooled
• 10 kW, with optional forced air cooling
• Mounting Configurations:
  Floor mounted 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:

• 780-3
  ERI Model 780-3 FM Band Pass Filter, three cavities, floor mounted, convection cooled.
• 780-3A
  ERI Model 780-3A FM Band Pass Filter, three cavities, floor mounted, forced air cooled.
• 780-4
  ERI Model 780-4 FM Band Pass Filter, four cavities, floor mounted, convection cooled.
• 780-4-NA
  ERI Model 780-4-NA FM Band Pass Filter, four cavities with optional non-adjacent coupling, floor mounted, convection cooled.
• 780-4A
  ERI Model 780-4A FM Band Pass Filter, four cavities, floor mounted, forced air cooled.
• 780-4A-NA
  ERI Model 780-4A-NA FM Band Pass Filter, four cavities with optional non-adjacent coupling, floor mounted, forced air cooled.

Product Brochure

780 Series Medium Power FM Band Pass Filter Product Brochure

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