mon in radar systems. A radar with frequency agility
then multiplied together to makeup the different base
for each pulse-repetition interval eliminates range
frequencies and multiplied by harmonic amplifiers
ambiguities caused by target echoes returning after the
and phase-lock loops similar to those shown in figures
next pulse interval begins.
2-12, a frequency synthesizer, and 2-13, a phase-lock
loop. Although these are not the only possible con-
Other frequency synthesizers use banks of crystals
figurations, they are representative of how frequencies
whose outputs are mixed in various combinations,
can be produced for radar transmitters and receivers.
Figure 2-12.—Frequency synthesizer.
Figure 2-13.—Phase-lock loop.
2-24
