Change level threshold to -6dB

sa_core.c

@@ -2308,12 +2308,12 @@ sweep_again:                                // stay in sweep loop when output mo
     } else if (setting.measurement == M_PASS_BAND  && markers[0].index > 10) {      // ----------------Pass band measurement
       int t = markers[0].index;
       float v = actual_t[t];
-      while (t > 0 && actual_t[t] > v - 3.0)                                        // Find left -3dB point
+      while (t > 0 && actual_t[t] > v - 6.0)                                        // Find left -3dB point
         t --;
       if (t > 0)
         markers[1].index = t;
       t = markers[0].index;
-      while (t < setting._sweep_points - 1 && actual_t[t] > v - 3.0)                // find right -3dB point
+      while (t < setting._sweep_points - 1 && actual_t[t] > v - 6.0)                // find right -3dB point
         t ++;
       if (t < setting._sweep_points - 1 )
         markers[2].index = t;