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 |
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LEVEL SET MODELS
Frequency Range (GHz) |
Attenuation Range (dB) |
VSWR (Max) |
Insertion Loss
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Standard Form Factor |
Model No. * |
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| 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. |
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| 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 | |
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* 1.7 VSWR above 11 GHz. |
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Form |
A |
B |
C |
D |
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2191 |
1.75 |
1.00 |
1.594 |
0.844 |
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3651 |
2.00 |
1.25 |
1.844 |
1.094 |
Miniature Continuosly Variable Attenuators
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2191 Series PDF Version |
3651 Series PDF Version |
