2-29
Q-32. What serves as a grid in a magnetron?
Q-33. A cylindrical copper block with resonant cavities around the circumference is used as what
component of a magnetron?
Q-34. What controls the output frequency of a magnetron?
Q-35. What element in the magnetron causes the curved path of electron flow?
Q-36. What is the term used to identify the amount of field strength required to cause the electrons to
just miss the plate and return to the filament in a circular orbit?
Q-37. A magnetron will produce oscillations when the electrons follow what type of path?
NEGATIVE-RESISTANCE MAGNETRON.—The split-anode, negative-resistance magnetron is
a variation of the basic magnetron which operates at a higher frequency. The negative-resistance
magnetron is capable of greater power output than the basic magnetron. Its general construction is similar
to the basic magnetron except that it has a split plate, as shown in figure 2-23A and B. These half plates
are operated at different potentials to provide an electron motion, as shown in figure 2-24. The electron
leaving the cathode and progressing toward the high-potential plate is deflected by the magnetic field and
follows the path shown in figure 2-24. After passing the split between the two plates, the electron enters
the electrostatic field set up by the lower-potential plate.
Figure 2-23A.—Split-anode magnetron.
