The Attenuator,variable, cataloged under National Stock Number 5985-00-090-7443, 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 Northrop Grumman Support Services Corp. Government technical data includes 20 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5985-00-090-7443 |
| Primary Part Number | 138C139H02 |
| Item Name | Attenuator,variable |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Northrop Grumman Support Services Corp |
| Status | ACTIVE |
| Insertion Loss at Minimum Attenuation in Maximum Decibels | 0.5 |
| Impedance Rating in Ohms | 50.0 INPUT-OUTPUT |
| Mounting Facility Type and Quantity | 4 THREADED HOLE(S) |
| Frequency Range | 2.900 MEGAHERTZ MINIMUM AND 3.100 MEGAHERTZ MAXIMUM |
| Body Style | COAXIAL TYPE |
| Mounting Facility Pattern | FOUR POSITION RECTANGULAR |
| Adjustment Device Type and Quantity | 1 KNOB |
| Center to Center Distance Between Mounting Facilities Parallel to Length | 2.500 INCHES NOMINAL IN |
| Overall Attenuation Range in Decibels | +0.0 TO 20.0 |
| Mounting Facility Screw Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Overall Attenuation Accuracy in Decibels | -1.00 TO 1.00 |
| Attenuation Variation Method | CONTINUOUS |
| Mounting Thread Quantity | 32 PER INCH |
| Mounting Facility Nominal Screw Thread Diameter | 0.138 INCHES IN |
| Operating Temp Range | -40.0 TO 62.0 CELSIUS DEGC |
| Center to Center Distance Between Mounting Facilities Parallel to Width | 2.250 INCHES NOMINAL IN |
| Application Design | TRANSMISSION LINE |
| Terminal Type and Quantity | 2 CONNECTOR, COAXIAL, FEMALE |
| Power Rating | 15.0 WATTS AVERAGE AND 5.0 KILOWATTS PEAK |
| Coaxial Connector Series Designation | SM |
| 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 |
|---|---|
| 4684-20V | Antenna & Radome Research Associates Corp Dba Arra Inc Div Arra Inc (USA) |
| 138C139H02 PRIMARY | Northrop Grumman Support Services Corp (USA) |
| Reference | Meaning |
|---|---|
| 138C139H02 | 3/9 Design control — primary reference U.S. Government activity |
NSN 5985-00-090-7443 is a Attenuator,variable, manufactured by Northrop Grumman Support Services Corp, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-00-090-7443 has 2 manufacturer part numbers on file: 4684-20V (Antenna & Radome Research Associates Corp Dba Arra Inc Div Arra Inc), 138C139H02 (Northrop Grumman Support Services Corp).
Key specifications for 138C139H02: Insertion Loss at Minimum Attenuation in Maximum Decibels: 0.5; Impedance Rating in Ohms: 50.0 INPUT-OUTPUT; Mounting Facility Type and Quantity: 4 THREADED HOLE(S); Overall Height: 2.875 INCHES NOMINAL IN. 20 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 5985-00-090-7443 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.