• The Sansui T7 is just one of a line of radio tuner models which the Japanese audio electronics manufacturer Sansui developed and released in the 1970s. The T7 model came with multiple knobs for adjusting the music quality as well as plug jacks for input from other music players or output to a pair of headphones. Although more powerful radio tuners have been developed since the T7 was released, its specifications made it a heavy favorite in its day.
  
  

Tuner Sensitivity

• The higher a radio tuner's sensitivity rating is, the less able that tuner is able to receive weak signals of transmission. A poor sensitivity rating for a tuner is generally rated at around 10 to 15 microvolts, which is expressed as uV. The tuner sensitivity for the Sansui T7 is rated at 1.8 uV.
  
  

Tuning Range

• The tuning range is the range of frequencies through which a radio tuner can scroll to pick up a transmission. On the AM channel band, the Sansui T7 offers an available frequency range of 535 kilohertz (kHz) to 1605 kHz. On the FM channel band, it can read frequencies from 88 megahertz (MHz) to 108 MHz.
  
  

Image Rejection

• Image rejection, also referred to as image frequency rejection, refers to a radio tuner's ability to block out signals neighboring the frequency into which the radio is tuned. The Sansui T7 has an image frequency rejection rating of better than 80 decibels (dB) at 98 MHz on the FM band, while on the AM band it's rated at better than 100 decibels per meter (dBm) at 1000 kHz.
  
  

Selectivity

• A radio tuner's selectivity rating expresses how well the tuner can focus in on one frequency signal in order to produce clear sound without noise from neighboring channels. The FM band of the Sansui T7 has a frequency selectivity rating of better than 60 dB; the AM band has a rating of better than 30 dB.