GregS wrote:

I suppose they still use Klystrons as deep space power amplifiers such as in Apollo missions.
I think the standard power was 20 KW and made by Collins. A Hydrogen Maser
was also used as a low noise amplifier and was used as the primary frequency
standard, Cesium second. I just updated my learning from the web. A Cesium
standard is basically a Xtal oscillator buffered with a atomic feedback loop and
has poor short term stability. The Maser has the best short term stability and porr long term.

greg


Klystrons & Klystrodes were common in UHF aTV transmitters. The last
I used were a set of 65 kW, made by EEV on us Ch. 55. They are being
replaced by solids state transmitters.


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