The Narda 757C is a high-performance coaxial fixed attenuator designed for precision RF and microwave applications, operating from DC to 12.4 GHz. It features a rugged design with Type N connectors and exhibits excellent VSWR and attenuation flatness across its entire frequency band.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | Type N Coaxial (1 Male, 1 Female) |
| Calibration Swept Data | Swept-frequency VSWR and attenuation data is supplied with each unit |
Physical
| Parameter | Value |
|---|---|
| Operating Temperature | -54 to +125 °C |
| Dimensions (W×H×D) | 21 mm (Diameter) × 57 mm (Length) (3, 6, 10, 20 dB) / 21 mm (Diameter) × 64 mm (Length) (30, 40 dB) |
| Weight | 0.071 kg (3, 6, 10, 20 dB) / 0.085 kg (30, 40 dB) |
| Housing Material | Passivated stainless steel |
| Connector Material | Passivated stainless steel outer conductor, gold-plated beryllium copper center contact |
RF Performance
| Parameter | Value |
|---|---|
| Frequency Range | DC to 12.4 GHz |
| Nominal Impedance | 50 Ohms |
| Maximum VSWR (DC to 4.0 GHz) | 1.15:1 |
| Maximum VSWR (4.0 to 8.0 GHz) | 1.20:1 |
| Maximum VSWR (8.0 to 12.4 GHz) | 1.25:1 |
| Nominal Attenuation Options | 3, 6, 10, 20, 30, 40 dB (option dependent) |
Power Handling
| Parameter | Value |
|---|---|
| Maximum Average Input Power | 5 W @ 25 °C |
| Power Derating Threshold | Derates linearly to 1 W @ 125 °C |
| Maximum Peak Input Power | 1 kW |
| Peak Power Pulse Width | 5 µs |
| Peak Power Duty Cycle | 0.05% |
Mechanical
| Parameter | Value |
|---|---|
| Port 1 Connector | Type N Male |
| Port 2 Connector | Type N Female |
| Design Directionality | Bidirectional |
RF Specifications
| Parameter | Value |
|---|---|
| Attenuation Deviation (DC to 4.0 GHz) | ±0.3 dB (3, 6, 10, 20 dB) / ±0.5 dB (30 dB) / ±1.0 dB (40 dB) |
| Attenuation Deviation (4.0 to 8.0 GHz) | ±0.3 dB (3, 6 dB) / ±0.5 dB (10, 20 dB) / ±0.8 dB (30 dB) / ±1.3 dB (40 dB) |
| Attenuation Deviation (8.0 to 12.4 GHz) | ±0.5 dB (3, 6 dB) / ±0.7 dB (10, 20 dB) / ±1.0 dB (30 dB) / ±1.5 dB (40 dB) |
Environmental
| Parameter | Value |
|---|---|
| Environmental Compliance | Designed to meet MIL-A-3933 environmental specifications |
Technology
Coaxial Thin Film
Applications
RF Power Attenuation & Impedance Matching
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