Narda 4778

The Narda 4778 series comprises fixed RF attenuators engineered for precision signal level reduction in microwave test, measurement, and system integration applications. These SMA-connectorized in-line modules deliver stable attenuation across DC to 18 GHz, with select models extending to 40 GHz. Built to handle 2 W average power while maintaining excellent VSWR performance, the 4778 series provides attenuation accuracy to ±0.3 dB (3, 6, 10 dB models) and ±0.5 dB (20, 30 dB models), making them suitable for demanding RF and microwave environments requiring reliable impedance matching and signal conditioning.

– Technical Specifications

• Attenuation Values: 3 dB, 4 dB, 6 dB, 10 dB, 20 dB, 30 dB
• Frequency Range: DC to 12.4 GHz (standard models); DC to 18 GHz (select models, including 4778-10); DC to 40 GHz (2.92 mm variants)
• Connector Interface: SMA (M/F)
• Power Handling: 2 W average maximum
• Attenuation Accuracy: ±0.3 dB (3, 6, 10 dB); ±0.5 dB (20, 30 dB)
• VSWR: 1.15:1 maximum (DC–4 GHz); 1.30:1 maximum (4–12.4 GHz); 1.15:1 or 1.30:1 maximum (DC–12.4 GHz, model dependent)
• Weight: ≤0.5 oz (≈14 g)
• Form Factor: SMA in-line module

– Key Features

• Compact, lightweight construction optimized for portable and rack-mounted systems
• Low insertion loss maintains signal integrity across the operating band
• Multiple attenuation steps support flexible signal conditioning in cascade configurations
• Excellent return loss performance over full frequency range

– Typical Applications

• Test and measurement instrumentation
• Signal conditioning and level control
• System integration and RF/microwave assemblies
• Telecommunications and radar systems
• Calibration channels
• Buffer and impedance matching stages

– Compatibility & Integration

SMA connectors provide direct compatibility with standard RF and microwave test equipment and system components. The compact in-line module design facilitates integration into existing systems without mechanical modification or external mounting structures.