DESCRIPTION:

The Bird Technologies 4028A400K Directional Power Sensor is a precision, high-power RF measurement sensor engineered for directional forward and reflected power readings across a 400 kHz to 550 kHz frequency range. Part of the 4028 Series Precision RF Directional Thruline Power Sensors, it delivers ±2 % accuracy at specified calibration frequencies and power levels and is designed to be used with compatible Bird multifunction power meters such as the Bird 4421A Series. 

Built for demanding RF environments including high-power semiconductor, display, and industrial RF processing applications, this sensor provides stable, repeatable measurement performance with calibration traceable to the National Institute of Standards and Technology (NIST). Multiple connector options are available and must be specified at the time of ordering — the accuracy guarantee applies only when the sensor is calibrated and sold with the installed connectors. 

Typical power measurement range for the 4028A400K is 1.0 kW to 20 kW, making it suitable for high-power RF system verification, maintenance, and process monitoring. It offers robust performance characteristics such as low insertion loss, strong directivity, and excellent VSWR behaviour when integrated into RF measurement workflows with Bird equipment. 

Key specifications embedded in this description include the frequency range (400 kHz–550 kHz), power range (1.0 kW–20 kW), accuracy (±2 % at calibration), and typical usage with Bird 4421A series meters.

Key Features

• Designed for 400 kHz to 550 kHz directional RF power measurement 

• High power coverage: 1.0 kW to 20 kW typical range 

• ±2 % accuracy at calibrated frequency and power levels (±3 % outside calibration) 

• Directional sensing of forward and reflected power 

• Low insertion loss ( 0.05 dB typical with 7-16 DIN) 

• Strong directivity ( 28 dB minimum) 

• Compatible with Bird 4421A Multifunction Power Meters and similar platforms