updated

Author: GvozdevLeonid

python_hackrf/pyhackrf_tools/pyhackrf_sweep.pyx

@@ -162,8 +162,8 @@ cpdef int sweep_callback(c_pyhackrf.PyHackrfDevice device, cnp.ndarray[cnp.int8_
         index += (pyhackrf.PY_BYTES_PER_BLOCK - data_length)
 
         raw_iq = buffer[index:index + data_length:2] / 128 + 1j * buffer[index + 1:index + data_length:2] / 128
-        raw_iq -= raw_iq.mean()
-        fftOut = fft(raw_iq * window)
+        raw_iq =  (raw_iq - raw_iq.mean()) * window 
+        fftOut = fft(raw_iq)
         pwr = np.log10(np.abs(fftOut * norm_factor) ** 2) * 10.0
 
         if sweep_style == pyhackrf.py_sweep_style.LINEAR: