The Keysight Agilent HP 778D is a high-performance, economical dual-directional coupler designed for swept measurements in the 100 MHz to 2 GHz range. Featuring high directivity and precise tracking between auxiliary arms, it is ideal for reflectometer applications and simultaneous reflection and transmission measurements in coaxial systems.
Specifications
Physical
| Parameter | Value |
|---|---|
| Dimensions (W×H×D) | 30 × 194 × 229 mm |
| Weight | 1.3 |
RF Performance Specifications
| Parameter | Value |
|---|---|
| Frequency Range | 100 MHz to 2 GHz |
| Nominal Coupling | 20 dB |
| Mean Coupling Accuracy | ±0.5 dB |
| Coupling Variation with Frequency | ±0.7 dB |
| Coupling Flatness | ±0.7 dB |
| Minimum Directivity (0.1 to 1.0 GHz) | 36 dB |
| Minimum Directivity (1.0 to 2.0 GHz) | 32 dB |
| Maximum Primary Line SWR | 1.1 |
| Maximum Auxiliary Line SWR | 1.1 |
| Maximum Insertion Loss | < 0.60 dB |
| Nominal Impedance | 50 Ω |
| Auxiliary Outputs Tracking | Typically within 0.7 dB |
| Measurement Range | Over 4 octaves with 1 coupler |
| Measurement Modes | Simultaneous reflection and transmission measurements |
Power Handling Ratings
| Parameter | Value |
|---|---|
| Maximum Average Input Power | 50 W |
| Maximum Peak Input Power | 500 W |
Physical and Mechanical Characteristics
| Parameter | Value |
|---|---|
| Standard Mainline Connectors | Type-N female (input) / Type-N male (output) |
| Option 011 Mainline Connectors | APC-7 |
| Option 012 Mainline Connectors | Type-N female (input and output) |
| Auxiliary Port Connectors | Type-N female |
Technology
Coaxial Directional Coupler
Applications
RF Power Monitoring and Swept Reflectometry