Variable Attenuator
138C139H02
(NSN) National Stock Number
5985-00-090-7443
Federal Supply Classification
5985 Antennas, Waveguides and Related Equipment
Item Name Code
00838
Schedule B Code
8529109000
Summary
Transmission line application design, coaxial type body style, 3.750 inches nominal overall length, 2.500 inches nominal center to center distance between mounting facilities parallel to length, 2.250 inches nominal center to center distance between mounting facilities parallel to width, 2.875 inches nominal overall height
| DAC | HCC | DMIL | RNCC |
|---|---|---|---|
| 5 | - | - | 3 |
| RNVC | SADC | MSDS | RNAAC |
|---|---|---|---|
| 2 | - | - | ZZ |
Identification
A device for reducing the strength of an alternating current signal either continuously or in steps, without causing appreciable signal distortion, by maintaining substantially constant output and/or input impedance match. Continuously variable resistive devices must consist of at least two sections or one section with at least two rotating contacts. The item must have an overall attenuation rating. Includes tandem mounted variable resistors designed to function as an attenuator but whose terminals are not connected. See also resistor, vaiable (as modified).
| INC | FIIG | Concept | Condition |
|---|---|---|---|
| 00838 | A223A0 | - | 1 |
Specifications
Application Design
transmission line
Details
The primary application for which the item is designed.Body Style
coaxial type
Details
The style designation indicating the configuration that most nearly corresponds to the appearance of the body.Overall Length
3.750 inches nominal
Details
The dimension measured along the longitudinal axis with terminated points at the extreme ends of the item.Center To Center Distance Between Mounting Facilities Parallel To Length
2.500 inches nominal
Details
The distance between the center of one mounting facility and the center of the adjacent mounting facility parallel to the length.Center To Center Distance Between Mounting Facilities Parallel To Width
2.250 inches nominal
Details
The distance between the center of one mounting facility and the center of the adjacent mounting facility parallel to the width.Overall Height
2.875 inches nominal
Details
The distance measured in a straight line from the bottom to the top of an item.Overall Width
3.000 inches nominal
Details
An overall measurement taken at right angles to the length of an item,in distinction from thickness.Operating Temp Range
-40.0 to 62.0 deg celsius
Details
The minimum and maximum limits of temperature at which the item is rated for operation.Coaxial Connector Series Designation
sm
Details
A letter or group of letters used to designate the particular coaxial connector series.Power Rating
15.0 watts average and 5.0 kilowatts peak
Details
The amount of electrical energy that can be dissipated.Mounting Facility Screw Thread Series Designator
unc
Details
A designation distinguishing one group of screw thread diameter-pitch combinations from another by the number of threads per measurement scale for a specific diameter on the mounting facility.Insertion Loss At Minimum Attenuation In Maximum Decibels
0.5
Details
The mathematical relationship of power available at the load before and after addition of the item to the circuit,set to its lowest value of attenuation,expressed in maximum decibels.Overall Attenuation Range In Decibels
+0.0 to 20.0
Details
The overall limits of decrease of the amplitude ratio of a signal between the input and output of the item,expressed in decibels.Attenuation Variation Method
continuous
Details
The means by which the attenuation can be varied from the minimum to the maximum setting.Mounting Facility Type And Quantity
4 threaded hole
Details
Indicates the type and number of facilities by which the item is mounted.Frequency Range
2.900 megahertz minimum and 3.100 megahertz maximum
Details
The minimum and maximum cyclic changes,per unit of time,for which an item is rated.Overall Attenuation Accuracy In Decibels
-1.00 to 1.00
Details
The overall limits of permissible variation in the attenuation accuracy from the nominal value at a specified frequency rating or range,expressed in decibels.Mounting Thread Quantity
32 per inch
Details
The number of mounting threads on the item measured on a line parallel to the thread axis,including incomplete threads.Adjustment Device Type And Quantity
1 knob
Details
Indicates the type and number of facilities for adjusting the item.Mounting Facility Pattern
four position rectangular
Details
The general configuration and relative position of the facilities provided for mounting the item.Mounting Facility Nominal Screw Thread Diameter
0.138 inches
Details
The nominal length of a straight line which passes through the center of a coaxial cylinder which would bound the crest of an external thread or the root of an internal thread.Impedance Rating In Ohms
50.0 input-output
Details
The total opposition (resistive and reactive) to the flow of alternating current,expressed in ohms.Terminal Type And Quantity
2 connector, coaxial, female
Details
Indicates the type and number of terminals for providing electrical connection.Master-Cross Reference List
| Part | CAGE | DAC | HCC | RNCC | RNVC | MSDS | RNAAC |
|---|---|---|---|---|---|---|---|
| 138C139H02 | 97942 | 1 | - | 3 | 9 | - | TX |
| 4684-20V | 09992 | 5 | - | 5 | 2 | - | TX |
Material and Special Handling
Hazardous material, precious metals, criticality, and electrostatic discharge indicators.
| HMIC | PMIC | ESD/EMI | Criticality |
|---|---|---|---|
| P | U | - | - |
Freight
Universal / National Freight and Handling Information
| UFC | HMC | LTL | LCL |
|---|---|---|---|
| 34580 | - | W | - |
| RVC | WCC | TCC | SHC |
|---|---|---|---|
| - | 658 | Z | 9 |
What's Included?
- Certificate of Conformity
- QC Inspection prior to shipping
- On time delivery
- Friendly service to back every order
Manufacturer
NORTHROP GRUMMAN SUPPORT SERVICES CORP
CAGE: 48306
ANNAPOLIS JUNCTION
, MD
, 20701-1166
UNITED STATES
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FAQs
Frequently asked questions for NSN 5985-00-090-7443
What is the NIIN of the NSN 5985-00-090-7443?
The National Item Identification Number (NIIN) of the NSN 5985-00-090-7443 is 00-090-7443
When the NSN 5985-00-090-7443 was assigned to the Federal Catalog?
It was assigned 52 years ago, on Wed, Nov 29, 1972
Does the NSN 5985-00-090-7443 contain any precious metals?
Type/content is unknown
Does the NSN 5985-00-090-7443 contain any hazardous material?
No information in HMIRS
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