p.6 “A radiation source for radar waves produces only a very limited spectral region.
In EPR such a source is called a klystron. A so-called X-band klystron has a spectral band width of
about 8.8-9.6 GHz. This makes it impossible to continuously vary the wavelength similarly to optical
Why are they using a klystron if it does not have a wide spectral band width? Are there better alternatives?