UB-09-628-Q(S)D

Overview

The UB-09-628-Q(S)D is a high-reliability coaxial variable attenuator manufactured by Floyd Bell Inc. It operates within a frequency range of DC to 4.0 GHz and provides a nominal attenuation value of 9 dB. The device features a TNC female connector interface and maintains a characteristic impedance of 50 Ohms. Key electrical specifications include a maximum insertion loss of 0.3 dB and a maximum voltage standing wave ratio (VSWR) of 1.35. It is designed for continuous wave input power handling up to 33.01 dBm, with a peak power rating of 200 Watts. The unit exhibits an operating temperature range extending up to 54 °C.

Feature Summary

• High reliability construction suitable for demanding environments
• Mechanical stop prevents damage between maximum and zero attenuation positions
• Low insertion loss ensures minimal signal degradation
• Compact coaxial design facilitates integration into RF systems

Applications

• RF test and measurement equipment calibration
• Telecommunications infrastructure signal conditioning
• Aerospace and defense electronic systems
• Military radar system power management

Procurement Notes

Verify the specific suffix configuration against the manufacturer's official documentation to ensure compatibility with required connector types and tolerance levels. Confirm that the procurement source provides valid traceability certificates and material compliance reports. Ensure the ordering part number matches the exact mechanical and electrical specifications required for the target application environment.

Selection Notes

Select this component when a fixed 9 dB attenuation step is required within the DC to 4.0 GHz bandwidth. Consider its high peak power handling capability for applications involving significant signal energy. Evaluate the TNC interface compatibility with existing system cabling. Assess the thermal performance limits relative to the expected ambient operating conditions of the final assembly.

Part Context

This model belongs to the Floyd Bell 115A through 119A series of manual step attenuators. These devices are engineered for precision control in radio frequency circuits. The series offers various attenuation ranges and increment steps, utilizing robust mechanical drive mechanisms. They are widely utilized in sectors requiring stable and repeatable signal attenuation characteristics.

Replacement Considerations

Public confirmed substitute part numbers are not available.