Miniature Continuously Variable Attenuators

These units represent the most complete line of miniature continuously variable attenuators. Most models weigh 2 or 3 ounces and have been qualified for all types of military applications. Since attenuation is achieved in a non-contacting manner, these units provide the most in wear-free performance and high reliability.

APPLICATIONS

The standard forms are ideal for applications where attenuation can be set, then locked and left for long periods of time without movement. The panel-mount version is ideally suited for applications where front panel adjustment is required and monitored via output power.
Turns-counting dials are ideally suited for panel mount applications where calibration or reference for resetting is required.
The digital counter version performs the same task as the turns-counting dial but with greater resolution. Both T & D options can be calibrated by utilizing a calibration chart. Order CT or CD option.

OPTIONAL FEATURES

The standard attenuator packages, Forms 2191 and 3651, have non-translating 1/4" diameter shafts with lock nut. They achieve full attenuation in less than 20 turns.
To maintain versatility this attenuator comes in 3 other packages. To specify these options, precede the model number with P for panel-mount version, T for turns-counting version, or D for digital counter version. When options are ordered, Standard Form 2191 changes to Form 4321 for panel-mount type, Form 4319 for turns-counting type or Form 0-3345 for digital counter type. Standard Form 3651 becomes Form 4322 for panel-mount type, Form 4320 for turns counting type or Form 0-3346 for digital counter type.

GENERAL SPECIFICATIONS

  • RF Power: 5 Watts average, 3 kW peak
  • Connectors: SMA Female standard
  • Temperature Range: -55 ° C to +85° C
  • Resettability: 0.1 dB or better
  • Material: Body - Aluminum / Connectors - Stainless Steel
  • Finish: ARRA Blue per MIL-C-22750
  • Mounting Provisions: All forms have tapped or thru holes

LEVEL SET MODELS

Frequency Range (GHz)
Attenuation Range (dB)
VSWR (Max)
Insertion Loss
(Max dB)
Standard Form Factor
Model No. *
1.0-2.0 10 1.8 0.5 3651 3814-10
1.5-2.0 15 1.7 0.5 3651 3814-15
2.0-4.0 10 1.8 0.5 2191 4804-10
20 1.5 0.5 3651 4814-20
2.5-4.0 10 1.5 0.5 2191 4804-10X
3.6-4.3 10 1.5 0.5 2191 4-5804-10
20 1.5 0.5 2191 4-5804-20
30 1.5 0.5 3651 4-5814-30
4.0-8.0 10 1.5 0.5 2191 5804-10
20 1.5 0.5 2191 5804-20
30 1.5 0.5 3651 5814-30
6.0-11.0 10 1.5 0.5 2191 5-6804-10
20 1.5 0.5 2191 5-6804-20
30 1.5 0.5 2191 5-6804-30
40 1.5 0.5 3651 5-6814-40
8.0-12.4 10 1.5 * 0.5 2191 6804-10
20 1.5 * 0.5 2191 6804-20
30 1.5 * 0.5 2191 6804-30
40 1.5 * 0.5 3651 6814-40
8.0-18.0 10 1.5 * 1.0 2191 9804-10
20 1.5 * 1.0 2191 9804-20
30 1.5 * 1.0 2191 9804-30
40 1.5 * 1.0 3651 9814-40
12.0-18.0 10 1.7 1.0 2191 9804-10X
20 1.7 1.0 2191 9804-20X
30 1.7 1.0 2191 9804-30X
40 1.7 1.0 2191 9804-40X

FLAT WITH FREQUENCY MODELS

Frequency Range (GHz)
Attenuation Range (dB)
Attenuation vs (Freq ±dB)
VSWR (Max)
Insertion Loss (Max dB)
Form Factor
Standard Model No.
2.5-3.0 20 1.0 1.5 0.5 3651 4813-20A
2.9-3.1 10 0.5 1.5 0.5 3651 4813-10A
20 0.5 1.5 0.5 3651 4813-20B
3.0-4.0 15 1.0 1.5 0.5 3651 4813-15A
3.7-4.2 20 1.0 1.5 0.5 3651 4-5813-20
4.0-8.0 10 1.0 1.5 0.5 3651 5813-10
20 1.5 1.5 0.5 3651 5813-20
5.4-5.9 20 0.5 1.5 0.5 3651 5813-20A
5.9-6.5 20 0.5 1.5 0.5 3651 5813-20B
7.2-7.8 30 0.5 1.5 0.5 3651 5813-30A
7.2-8.4 30 1.0 1.5 0.5 3651 5-6813-30A
7.9-8.4 30 0.5 1.5 0.5 3651 6813-30A
8.0-12.4 10 0.5 1.5 * 0.5 3651 6813-10
20 1.0 1.5 * 0.5 3651 6813-20
8.0-18.0 10 1.5 1.5 * 1.0 2191 9803-10
8.5-10.5 10 0.5 1.5 0.5 2191 6803-10A
20 0.5 1.5 0.5 2191 6803-20A
10.0-12.0 30 0.5 1.5 0.5 2191 6803-30A
10.5-12.4 10 0.5 1.6 0.5 2191 6803-10B
20 0.5 1.6 0.5 2191 6803-20B
12.0-18.0 10 1.0 1.7 1.0 2191 9803-10A

* 1.7 VSWR above 11 GHz.

Form

A

B

C

D

2191

1.75

1.00

1.594

0.844

3651

2.00

1.25

1.844

1.094

Miniature Continuosly Variable Attenuators
Outline Drawings - PDF Downloads

2191 Series PDF Version

3651 Series PDF Version