Ideal and Very Poor Spectrums.
c. Now look at Part B of Figure 97 which shows a very poor spectrum. A
spectrum of this type indicates that the output of the magnetron is not a
good rectangular pulse.
If the output of the transmitter looks like the
spectrum shown in Part B or is distorted in some other way, it means the
magnetron is not operating correctly. An incorrect spectrum indicates one
of the following troubles:
(1) Magnetron pulling.
(2) Magnetron pushing.
(3) Mode shifting and mode jumping.
(4) Improper pulse width.
know whether or not the cause of bad operation is in the transmitter. If it
is, the next step is to isolate the trouble to a particular stage and
34. Final summary.
You have learned in this lesson how a magnetron works, and you have
seen some possible causes of magnetron troubles.
You realize now that
although the magnetron is basically simple, a radar set is useless unless
the magnetron is working.
Figure 98 lists the main characteristics and
operating values of four different magnetrons.
This shows at a glance
typical values you will work with. As part of the final summary, a glossary
of magnetron terms follows Figure 98.
Refer to the glossary until you
become familiar with these terms.