1: "X", "K" and "Ka"
are radar band designations used by the U.S.A.
Police Radar and Radar Detector manufacturers.
American and Australian frequencies (bands) may
not correspond precisely. In the USA, the "Ka"
band is 33.4 - 36.0 GHz.
2:. Radar detectors on this site cover
the "FCC" (American) and "ACMA"
(Australian) frequencies. Some models permit
removal of scanning for unwanted frequencies.
This may be a good option for several reasons.
A. The frequency is no longer used for traffic
radar in your area.
B. Removal of radar frequencies may result in
less false alerts. The resultant quicker scanning
of frequencies (less total bandwidth) may produce
earlier detection of "instant-on" mobile
and "photo" radar (speed cameras).