The Attenuator,variable, cataloged under National Stock Number 5985-01-065-5577, 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 Merrimac Industries, Inc. Government technical data includes 19 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5985-01-065-5577 |
| Primary Part Number | AUM-25A/40748 |
| Item Name | Attenuator,variable |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Merrimac Industries, Inc |
| Status | ACTIVE |
| Insertion Loss at Minimum Attenuation in Maximum Decibels | 1.0 |
| Impedance Rating in Ohms | 50.0 INPUT-OUTPUT |
| Mounting Facility Type and Quantity | 4 UNTHREADED HOLE(S) |
| Frequency Range | 600.000 MEGAHERTZ MINIMUM AND 650.000 MEGAHERTZ MAXIMUM |
| Body Style | COAXIAL TYPE |
| Attenuation Accuracy Reference Frequency | 3.1 MEGAHERTZ |
| Mounting Facility Pattern | FOUR POSITION RECTANGULAR |
| Adjustment Device Type and Quantity | 1 SLOTTED SCREW |
| Center to Center Distance Between Mounting Facilities Parallel to Length | 1.495 INCHES MINIMUM AND 1.505 INCHES MAXIMUM IN |
| Overall Attenuation Range in Decibels | +1.0 TO 12.0 |
| Voltage Standing Wave Ratio | 1.50 |
| Unthreaded Mounting Hole Diameter | 0.090 INCHES MINIMUM AND 0.094 INCHES MAXIMUM IN |
| Attenuation Variation Method | CONTINUOUS |
| Operating Temp Range | +0.0 TO 65.0 CELSIUS DEGC |
| Center to Center Distance Between Mounting Facilities Parallel to Width | 0.837 INCHES MINIMUM AND 0.847 INCHES MAXIMUM IN |
| Application Design | TRANSMISSION LINE |
| Terminal Type and Quantity | 1 CONNECTOR, COAXIAL, MALE AND 1 CONNECTOR, COAXIAL, FEMALE |
| Power Rating | 2.0 WATTS AVERAGE |
| Coaxial Connector Series Designation | SMA |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL D — Destroy Item |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| AUM-25A/40748 PRIMARY | Merrimac Industries, Inc (USA) |
| Reference | Meaning |
|---|---|
| 911742-1 | 5/9 Secondary reference Raytheon Company Div Corp |
| 911742-1 | 7/2 Vendor item drawing reference Raytheon Company Dba Raytheon Co |
NSN 5985-01-065-5577 is a Attenuator,variable, manufactured by Merrimac Industries, Inc, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-01-065-5577 has 1 manufacturer part number on file: AUM-25A/40748 (Merrimac Industries, Inc).
Key specifications for AUM-25A/40748: Insertion Loss at Minimum Attenuation in Maximum Decibels: 1.0; Impedance Rating in Ohms: 50.0 INPUT-OUTPUT; Mounting Facility Type and Quantity: 4 UNTHREADED HOLE(S); Overall Height: 1.720 INCHES NOMINAL IN. 19 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 5985-01-065-5577 has DEMIL Code D. 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.