The Switch,radio Frequency Transmiss, cataloged under National Stock Number 5985-01-390-1308, 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 L3harris Technologies, Inc Div Space & Airborne Systems. Government technical data includes 27 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5985-01-390-1308 |
| Primary Part Number | 658378-002 |
| Item Name | Switch,radio Frequency Transmiss |
| FSC / FSG | 5985 / 59 — Antennas, Waveguides, and Related Equipment |
| Manufacturer | L3harris Technologies, Inc Div Space & Airborne Systems |
| Status | ACTIVE |
| Switching Time | 0.5 MICROSECONDS US |
| Mounting Facility Type and Quantity | 4 UNTHREADED HOLE(S) |
| Body Style | RECTANGULAR |
| Mounting Facility Pattern | FOUR POSITION TRAPEZOID SINGLE MOUNTING FACILITY PATTERN |
| Voltage Standing Wave Ratio | 2.00 SINGLE |
| Unthreaded Mounting Hole Diameter | 0.094 INCHES NOMINAL IN |
| Pole Quantity | 1 |
| Longest Vertical Distance Between Mounting Centers | 0.380 INCHES NOMINAL SINGLE MOUNTING FACILITY PATTERN IN |
| Switch Return Mechanism Type | FAIL-SAFE |
| Shortest Horizontal Distance Between Mounting Centers | 0.295 INCHES NOMINAL SINGLE MOUNTING FACILITY PATTERN IN |
| Distance Between Mounting Facility Centers | 0.380 INCHES NOMINAL SECOND MOUNTING FACILITY PATTERN IN |
| Distance Between Mounting Facility Centers | 0.750 INCHES NOMINAL FIRST MOUNTING FACILITY PATTERN IN |
| Coupling Position Quantity | 3 |
| Minimum Crosstalk Rating in Decibels | 40.0 SINGLE |
| Switch Type | NONTRANSFER |
| Insertion Loss in Decibels | 1.50 SINGLE |
| Actuator Operating Method | SOLID STATE |
| Operating Temp Range | -30.0 TO 75.0 CELSIUS DEGC |
| Frequency Rating | 0.4 GIGAHERTZ MINIMUM AND 18.1 GIGAHERTZ MAXIMUM SINGLE FREQUENCY CROSSTALK REFERENCE |
| Frequency Rating | 0.4 GIGAHERTZ MINIMUM AND 18.1 GIGAHERTZ MAXIMUM SINGLE FREQUENCY INSERTION LOSS REFERENCE |
| Frequency Rating | 0.4 GIGAHERTZ MINIMUM AND 18.1 GIGAHERTZ MAXIMUM SINGLE FREQUENCY OPERATING |
| Frequency Rating | 0.4 GIGAHERTZ MINIMUM AND 18.1 GIGAHERTZ MAXIMUM SINGLE FREQUENCY RF POWER HANDLING |
| Frequency Rating | 0.4 GIGAHERTZ MINIMUM AND 18.1 GIGAHERTZ MAXIMUM SINGLE FREQUENCY VOLTAGE STANDING WAVE RATIO |
| Rf Power Handling Capability | 0.75 WATTS PEAK SINGLE |
| Terminal Type and Quantity | 4 PIN AND 1 TURRET |
| Intermediate Horizontal Distance Between Mounting Centers | 0.280 INCHES NOMINAL SINGLE MOUNTING FACILITY PATTERN IN |
| Switch Operation Sequence | MAKES BEFORE BREAKS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| SW-2181-2A-305-658378-002 | American Microwave Corporation (USA) |
| CMCS0445 | Custom Microwave Components, Inc Dba Custom Microwave Components Inc (USA) |
| 658378-002 PRIMARY | L3harris Technologies, Inc Div Space & Airborne Systems (USA) |
| Reference | Meaning |
|---|---|
| 658378-002 | 5/9 Secondary reference American Microwave Corporation |
| 658378-002 | 3/9 Design control — primary reference Harris Corporation Dba Edo Reconnaissance and Surveillance Systems Div Ew Recon and Surveillance Systems |
| SW-2181-2A-305 | 5/9 Secondary reference American Microwave Corporation |
| 658378-002 | 5/9 Secondary reference Watkins-Johnson Co |
NSN 5985-01-390-1308 is a Switch,radio Frequency Transmiss, manufactured by L3harris Technologies, Inc Div Space & Airborne Systems, classified under FSC 5985, Antennas, Waveguides, and Related Equipment. Status: active.
NSN 5985-01-390-1308 has 3 manufacturer part numbers on file: SW-2181-2A-305-658378-002 (American Microwave Corporation), CMCS0445 (Custom Microwave Components, Inc Dba Custom Microwave Components Inc), 658378-002 (L3harris Technologies, Inc Div Space & Airborne Systems).
Key specifications for 658378-002: Switching Time: 0.5 MICROSECONDS US; Mounting Facility Type and Quantity: 4 UNTHREADED HOLE(S); Overall Height: 1.750 INCHES NOMINAL IN; Body Style: RECTANGULAR. 27 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 5985-01-390-1308 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.