Spectrum analysis is performed by sweeping through a specified frequency range and successively detecting signal power at each of {HEAD ~ a plurality} of {TAIL ~ relatively narrow frequency bands} within the frequency range 
of
Spectrum analysis is performed by sweeping through a specified frequency range and successively detecting signal power at each of { HEAD ~ a plurality } of { TAIL ~ relatively narrow frequency bands } within the frequency range
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH