The Waveguide Assembly, cataloged under National Stock Number 5985-01-494-3139, 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 Mesa Microwave Inc.. Government technical data includes 25 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5985-01-494-3139 |
| Primary Part Number | FS-100P-N-3AC-3AC-L19.745 |
| Item Name | Waveguide Assembly |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | Mesa Microwave Inc. |
| Status | ACTIVE |
| Tubing Wall Construction Style | CORRUGATED ALL TUBING SEGMENT |
| Flange Inside Height | 1.335 INCHES MINIMUM AND 1.345 INCHES MAXIMUM ALL FLANGES IN |
| Flange Quantity | 2 |
| Precious Material | SILVER |
| Voltage Standing Wave Ratio | 1.728 |
| Style Designator | STRAIGHT TYPE |
| Flexibility | FLEXIBLE ALL TUBING SEGMENT |
| Waveguide Inside Width | 2.835 INCHES MINIMUM AND 2.845 INCHES MAXIMUM IN |
| Cross-Sectional Shape Style | INTERNAL, RECTANGULAR EXTERNAL, RECTANGULAR |
| Flange Outside Height | 2.995 INCHES MINIMUM AND 3.005 INCHES MAXIMUM ALL FLANGES IN |
| Flange Connecting Hole Diameter | 0.255 INCHES MINIMUM AND 0.265 INCHES MAXIMUM ALL FLANGES ALL CONNECTION FACILITIES IN |
| Flange Inside Width | 2.835 INCHES MINIMUM AND 2.845 INCHES MAXIMUM ALL FLANGES IN |
| Waveguide Length | 19.745 INCHES NOMINAL IN |
| Specified Frequency | 2.60 GIGAHERTZ MINIMUM AND 3.95 GIGAHERTZ MAXIMUM |
| Waveguide Outside Height | 1.505 INCHES MINIMUM AND 1.515 INCHES MAXIMUM IN |
| Waveguide Outside Width | 3.005 INCHES MINIMUM AND 3.015 INCHES MAXIMUM IN |
| Flange Depth | 0.245 INCHES MINIMUM AND 0.255 INCHES MAXIMUM ALL FLANGES IN |
| Flange Outside Width | 4.495 INCHES MINIMUM AND 4.505 INCHES MAXIMUM ALL FLANGES IN |
| Insertion Loss in Decibels | 0.049 |
| Surface Treatment | SILVER ALL TUBING SEGMENT AND FLANGE INSIDE SURFACES |
| Precious Material and Location | CORE PLATING SILVER |
| Waveguide Inside Height | 1.335 INCHES MINIMUM AND 1.345 INCHES MAXIMUM IN |
| Material | ALUMINUM ALL TUBING SEGMENT AND FLANGE |
| Flange Connecting Facility and Quantity | 10 UNTHREADED HOLE(S) ALL FLANGES ALL CONNECTION FACILITIES |
| Flange Style | CONTACT TYPE ALL FLANGES |
| 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 |
|---|---|
| FS-100P-N-3AC-3AC-L19.745 PRIMARY | Mesa Microwave Inc. (USA) |
| AMC1481 | Frontgrade Technologies Inc. (USA) |
| Reference | Meaning |
|---|---|
| 89W653P002 | 5/9 Secondary reference Leonardo S.p.a Land & Naval Defence Electronics Division |
| AMC1481-WAVEGUIDE 19.75 IN LONG | 5/9 Secondary reference Atlantic Microwave Corporation Div Cobham Electronic Systems |
| FS-100P-N-3AC3AC-I19 | C/1 Advisory reference — outside the item-of-supply concept Mesa Microwave Inc. |
NSN 5985-01-494-3139 is a Waveguide Assembly, manufactured by Mesa Microwave Inc., classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-01-494-3139 has 2 manufacturer part numbers on file: FS-100P-N-3AC-3AC-L19.745 (Mesa Microwave Inc.), AMC1481 (Frontgrade Technologies Inc.).
Key specifications for FS-100P-N-3AC-3AC-L19.745: Tubing Wall Construction Style: CORRUGATED ALL TUBING SEGMENT; Flange Inside Height: 1.335 INCHES MINIMUM AND 1.345 INCHES MAXIMUM ALL FLANGES IN; Flange Quantity: 2; Precious Material: SILVER. 25 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 5985-01-494-3139 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.