On 10/29/2011 09:55 PM, J. Forster wrote:
Ammonia was the first clock wasn't it?
I think it was an amplifier, not an oscillator. Microwave Amplification by
Stimulated Emission of Radiation = MASER.
The ammonia clocks was not operating in amplification mode, but in
absorbtion mode similar to a rubidium gas cell.
The active H maser is the only self-amplifying maser being in wide use,
all others are passive masers.
Cheers,
Magnus
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