The Attenuator,fixed, cataloged under National Stock Number 5985-01-353-5566, is classified within Federal Supply Class 5985 (Antennas, Waveguides, and Related Equipment) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Microwave Communications Laboratories, Inc.. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5985-01-353-5566 |
| Primary Part Number | FAN-4-20 |
| Item Name | Attenuator,fixed |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Microwave Communications Laboratories, Inc. |
| Status | ACTIVE |
| Frequency Range | 0.000 HERTZ MINIMUM AND 4.000 GIGAHERTZ MAXIMUM |
| Body Style | ROUND, TERMINAL/TERMINALS IN OPPOSITE SURFACE |
| Overall Diameter | 1.650 INCHES MAXIMUM IN |
| Voltage Standing Wave Ratio | 1.15 |
| Input Impedance Rating in Ohms | 50.0 |
| Mounting Method | CONNECTOR |
| Rf Signal Attenuation in Decibels | 20.0 |
| Criticality Code Justification | FEAT |
| Attenuation Accuracy in Decibels | -0.50 TO 0.50 |
| Connection Type Per Function | MALE INPUT AND FEMALE OUTPUT |
| Operating Temp Range | -55.0 TO 125.0 CELSIUS DEGC |
| Voltage Standing Wave Ratio Frequency Range | +0.0 TO 4.0 GIGAHERTZ |
| Application Design | TRANSMISSION LINE |
| Material | COPPER ALLOY BODY |
| Power Rating | 20.0 WATTS AVERAGE AND 1.0 KILOWATTS PEAK |
| Terminal Type and Quantity | 2 CONNECTOR |
| Output Impedance Rating in Ohms | 50.0 |
| Coaxial Connector Series Designation | N |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | Y |
| Part Number | Manufacturer |
|---|---|
| FAN-4-20 | Microwave Communications Laboratories, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 40098-20 | 5/2 Secondary reference U.S. Government activity |
| 1A20868H04 | 3/2 Design control — primary reference U.S. Government activity |
| RME-U-0093 | 5/9 Secondary reference Rme Filters Inc |
NSN 5985-01-353-5566 is a Attenuator,fixed, manufactured by Microwave Communications Laboratories, Inc., classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-01-353-5566 has 1 manufacturer part number on file: FAN-4-20 (Microwave Communications Laboratories, Inc.).
Key specifications for FAN-4-20: Frequency Range: 0.000 HERTZ MINIMUM AND 4.000 GIGAHERTZ MAXIMUM; Body Style: ROUND, TERMINAL/TERMINALS IN OPPOSITE SURFACE; Overall Diameter: 1.650 INCHES MAXIMUM IN; Voltage Standing Wave Ratio: 1.15. 18 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 5985-01-353-5566 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.