Technical Notes
Page 11
Traveling Wave Tube
Translated from German
All Italics mine. Kevin O'Neill
View Diagram Here
The traveling wave tube is used in oscillators and amplifiers
for gigahertz frequencies.
The electrons produce a straight beam from the cathode to the anode. The anode
contains a hole, by which the electrons withdraw through the long tube. A spiral coil of wire
is wound around the pipe. The distributed capacitance and inductance of this coil
produce a very low speed factor in the electron beam.
TS! (the speed factor is the
relationship of the speed of an electro magnetic field in a medium times
one hundred to the speed in the vacuum.
v = 100 c1 divided by C
(c = 299.792 km/seconds))
The factor within the tube is approximately 10-20%. The wound wire
(Helix) energy gets if now, then oscillations within the tube, which run
forward or backwards and from 20 -100 milli Watts of energy with frequencies
from gigahertz, develop.
The oscillations can be uncoupled at the beginning or end.
The traveling wave tube produces very stable frequencies.
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