On 31 May 2006 15:31:11 -0700, "K7ITM" wrote:

In the last paragraph you quoted, there is what I consider a mistake
that can lead to misunderstanding of how things work. It suggests that
each cavity is an oscillator. The cavities are no more oscillators
than a bottle.

Hi Tom,

I defer to the author's explanation, and the nature of writing for a
wide audience. This group would be such an example.

The author mentions, in portions not quoted, that the electron
beam/current/what-have-you streams at a grazing angle along the arc of
the inside of the plate, crossing these openings. The cavities are,
then, parallel plate loads.

It stands to reason, on the other hand, that there is only one output
from ostensibly one cavity whose fields are sharing the passing stream
of electrons that is also resonating. In fact, this operation (also
described by the author) led to understanding and development of the
Klystron tube and other traveling wave amplifiers.

73's
Richard Clark, KB7QHC