Keysight 87405B/001 Preamplifier

Superior RF Performance

• 22 dB gain
• 8 dBm output power
• 5 dB noise figure

Bias Option

• DC Bias Volt/Amp: +15 V at 80 mA
• Compact size, integral bias regulation

Delivering Clean Amplified Signals Engineers Need

The Keysight 87405B Preamplifier delivers 22–27 dB of gain and a low 5 dB noise figure, giving your measurement system an immediate boost in sensitivity and accuracy. Its compact, field‑ready design operates directly from compatible Keysight analyzers, eliminating the need for an external power supply.

Covering 10 MHz to 4 GHz, the 87405B enhances low‑level signal detection, accelerates sweep times, and improves overall dynamic range—making it a powerful, plug‑and‑play upgrade for RF engineers who need reliable, repeatable performance in both lab and field environments.

What's in the Box

• 87405B Preamplifier