4028A2M, 1.5-2.5 MHz Directional Power Sensor (CALDATA included)

4028A2M, 1.5-2.5 MHz Directional Power Sensor (CALDATA included)

4028A2M, 1.5-2.5 MHz, 1.0-25 kW

Directional RF Power Sensor

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4028A2M, RF Power Sensor is a high accuracy sensor for use in high power LCD, TFT and Solar processing and other precision high power applications. Intended for use with Bird's 4421A Series and 4421 Precision Laboratory Power Meters. These sensors can provide a threefold improvement in long-term unit-to-unit accuracy.

Connectors are required to be equipped on BOTH the INPUT and OUTPUT side of the sensor.
Bird guarantees the 4028 Series Sensors at 2% Accuracy only with connectors the sensor is calibrated and sold with.
If you do not select connectors when placing this item in the shopping cart someone from sales will contact you to assist with connector selection and final pricing.


  • Achieve tighter, more consistent RF power measurements for improved yield.
  • ±2% accuracy at specified calibration frequencies and power levels.
  • Direct, plug-in operation with the industry standard Bird Model 4421A Series and 4421 RF Power Meters.


  • Need very high degree of accuracy - Capable of 2% accuracy
  • Require custom connectors - 4028A Series sensor can be configured with a wide range of connectors.


  • Frequency Range: 1.5-2.5 MHz
  • Power Range: 1.0-25 kW
  • Calibration
    • Frequency: 1.8, 2.0, 2.17 MHz (typ)
    • Power: 1.7 kW
    • Cycle: 1 year
  • Accuracy: ±2.0% (2 σ)
    • Outside Cal (Power and Freq.): ±3.0% (2 σ)
    • RFL: = Fwd accuracy + (Fwd Power/ 10^{directivity/10})
    • VSWR: Calculated from Fwd and Rfl power (VSWR = [1+Sqrt(Pr/PF)] / [1-Sqrt(Pr/Pf) / [1-Sqrt (Pr/Pf)])
  • Impedance: 50 Ohms (nominal)
  • VSWR: 1.05:1 (max) | Allowable Terminating: 2.00:1 (max)
  • Insertion Loss: 0.05 dB (with female 7-16 DIN connectors)
  • Directivity: 28 dB (min)
  • Sampling Rate: 2 readings per second (nominal)
  • External DC: 12 VDC, supplied from 4421A Multifunction Power Meter
  • Connectors: Input and Output Connectors MUST be ordered separately at additional cost

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