Allen Avionics Highpass Filter 300 kHz 50 Ohm SMA RF Signal For Parts

Allen Avionics Highpass Filter 300 kHz 50 Ohm SMA RF Signal For Parts

This is an Allen Avionics passive highpass filter rated at a cutoff frequency (Fc) of 300 kHz with a 50-ohm characteristic impedance. It is housed in a compact shielded metal enclosure with SMA female connectors at each end labeled IN and OUT. Allen Avionics, based in Mineola, New York, is a long-established manufacturer of RF and analog signal filters used in electronics, avionics, communications, and laboratory applications. No manufacturer part number is printed on the unit.

Specifications & What's Included

• Brand: Allen Avionics, Inc. — Mineola, NY 11501
• Filter type: Highpass
• Cutoff frequency (Fc): 300 kHz
• Characteristic impedance (Z): 50 Ohms
• Connectors: SMA female (IN and OUT)
• Housing: Shielded painted metal box enclosure
• Mounting: Two threaded studs on top panel
• Manufacturer part number: None printed on unit
• Condition: As-is / for parts or repair — not tested

Applications

Highpass filters from Allen Avionics are passive RF and analog signal conditioning components used to pass frequencies above a defined cutoff while attenuating lower-frequency signals and noise. A 300 kHz cutoff with 50-ohm impedance is a common specification in communications, audio/RF test bench setups, spectrum analysis chains, and avionics signal processing. SMA connectors make this filter suitable for integration into coaxial RF signal paths. Allen Avionics has produced filters of this type since the 1970s for military, aerospace, broadcast, and lab instrumentation applications. This style of compact shielded-box filter was widely used in analog signal processing chains where interference rejection below a specific frequency threshold was needed.