The filter includes the same field-proven Invar and bellows temperature compensation used in all models of ERI’s medium and high-power FM filter products. The filter contains a cross-coupling standard for additional isolation in combiner systems with closely spaced frequencies. The filter is rated to handle up to 3 kW at the output after insertion losses, convection cooled, and the rating is increased to 5 kW with a forced air-cooling fan.

The filter includes 1-5/8-inch unflanged input and output connections, and the EIA flanged version is optionally available. The filter can be used for intermodulation product suppression or configured as an FM channel combiner. A constant impedance configuration, which is also very compact, is also available.

NOTE: Bandpass Filters include a single-port fixed directional coupler at the filter input and a dual-port directional coupler at the output.

Features

• Includes cross-coupling for higher rejection for use in applications with closely spaced frequencies
• Folded design for minimum footprint
• ERI's Bellows Temperature-Compensation Technology, temperature stable using Invar
• Rugged 3/16-inch-thick aluminum construction eliminates the oil-can effect from heating
• 1-5/8-inch EIA Flanged or Unflanged Input and Output connections
• The filter can be tuned to different bandwidths based on the need
• 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 the full-power operation of filters
• No Teflon or other insulating material is used in coupling cavities, eliminating a primary point of failure in competitors' designs.
• Ability to change frequency quickly and with a minimum of disassembly
• Easily assembled floor-standing unit (hardware for ceiling suspension available on request)

FI940 FM Bandpass Filter Product Brochure

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