For example: Agilent E4440A or Anritsu 68369
400MHz to 4000MHz, Noise Source
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Keysight / Agilent 349A Overview
400 to 4000MHz frequency range.
Excess Noise Ratio is 15.6 dB, ±0.6 dB.
Maximum SWR (50 ohms nominal) is 2.0 (ON), 3.0 (OFF).
The Agilent HP 349A UHF Noise Source consists of argon gas discharge tubes in Type N coaxial configuation for automatic noice figure readings,