Hi.

   I just use the the RTL2832U and Rt820t  dongle to scan the wireless and draw the specturm of what i get.

   But i find the data i calculate is never bigger than -46dbm also never smaller than -63dbm.Is that the dongle's

  receiving ability is just like that?

  By the way, here is how i test the dongle:

  1¡¢i turn on a basestaion

  2¡¢i used the gsm module to detect the power of basestaion nearby,i get about -20dbm as the biggest

  3¡¢i used the dongle which i set its working frequency to the frequency that basestaion used 

  4¡¢i calculate the spectrum using the data return by dongle(honestly, i used the rtl_power to calculate)

  

  the result i calculate is never big than -46dbm,what a difference from the result from gsm module.

  So i wonder whether the dongle's receiving abllity is just ordinary or the way i calculate is wrong?