The Narda 3040B-30 is a coaxial directional coupler delivering 30 dB coupling across the 240–500 MHz band. Built for precision measurement and signal monitoring in RF systems, it combines low insertion loss with exceptional directivity and calibration accuracy. Type N female connectors and high power handling make it suitable for both laboratory and field deployment.
Technical Specifications
Frequency Range: 0.240–0.500 GHz
Coupling Value: 30 dB
Insertion Loss: 0.2 dB maximum
Directivity: 20 dB minimum
Absolute Calibration Accuracy: ±0.1 dB per 10 dB step
Frequency Sensitivity: ±0.25 dB
Maximum Deviation from Nominal: ±0.5 dB
VSWR (Maximum)
• Primary line: 1.15
• Secondary line: 1.20
– Key Features
Power Capability
• Average incident power: 200 W
• Average reflected power: 200 W
• Peak power: 10 kW
The combination of high peak power handling and tight calibration tolerance (±0.1 dB) enables accurate power and directivity measurements across the VHF band without requiring frequent recalibration. Low VSWR on both lines ensures minimal signal reflection and impedance mismatch effects.
– Typical Applications
Directional couplers of this specification are deployed in RF test benches for incident and reflected power monitoring, antenna tuning systems, and transmitter efficiency measurement. The 20 dB minimum directivity supports accurate decoupling of forward and reverse signals in high-power RF environments.
– Compatibility & Integration
Connectors: Type N female
Weight: 0.6 kg maximum (1.25 lbs)
Type N female connectors provide secure mating with standard 50 Ω RF cables and test equipment used throughout the UHF and VHF measurement range.
