CP Clare's TD Series of gas discharge microwave noise tubes and TN Series of gas discharge microwave noise sources are the element in a microwave RF system that allows accurate measurements of the noise figure of the receiver or its components.
The TD/TN Series from CP Clare comprises gas‑discharge microwave noise tubes and noise sources used for accurate noise‑figure measurements in RF systems. The series offers broad bandwidth, high stability, long life, and operation in AC, DC, or pulsed modes.
The handbook lists features, detailed specifications for each part number, compatible current‑regulated power supplies (PS‑237 to PS‑240), and ordering information, helping users select the right tube for their frequency range and ENR requirements.
| Frequency range | 0.2 – 220.0 GHz |
|---|---|
| ENR range | 8.8 – 20.1 dB |
| Operating current | 30 – 250 mA |
| Starting voltage | 0.9 – 70 kV |
They operate from 0.2 GHz up to 220 GHz.
Current‑regulated supplies PS‑237 through PS‑240 can be used to operate many of the noise sources.
The excess noise ratio (ENR) ranges from about 8.8 dB to 20.1 dB.
The tubes have a life of up to 20,000 hours.