diff --git a/main.c b/main.c
index dea6ea1..a49b1dc 100644
--- a/main.c
+++ b/main.c
@@ -634,7 +634,8 @@ VNA_SHELL_FUNCTION(cmd_dump)
   if (argc == 1)
     dump_selection = my_atoi(argv[0]);
 
-  wait_dsp(3);
+  dsp_start(3);
+  dsp_wait();
 
   len = AUDIO_BUFFER_LEN;
   if (dump_selection == 1 || dump_selection == 2)
@@ -1670,7 +1671,8 @@ static const struct {
   { "REAL",   NGRIDY/2,  0.25 },
   { "IMAG",   NGRIDY/2,  0.25 },
   { "R",      NGRIDY/2, 100.0 },
-  { "X",      NGRIDY/2, 100.0 }
+  { "X",      NGRIDY/2, 100.0 },
+  { "Q",             0,  10.0 }
 };
 
 static const char * const trc_channel_name[] = {
@@ -1774,8 +1776,8 @@ VNA_SHELL_FUNCTION(cmd_trace)
 #if MAX_TRACE_TYPE != 12
 #error "Trace type enum possibly changed, check cmd_trace function"
 #endif
-  // enum TRC_LOGMAG, TRC_PHASE, TRC_DELAY, TRC_SMITH, TRC_POLAR, TRC_LINEAR, TRC_SWR, TRC_REAL, TRC_IMAG, TRC_R, TRC_X, TRC_OFF
-  static const char cmd_type_list[] = "logmag|phase|delay|smith|polar|linear|swr|real|imag|r|x|off";
+  // enum TRC_LOGMAG, TRC_PHASE, TRC_DELAY, TRC_SMITH, TRC_POLAR, TRC_LINEAR, TRC_SWR, TRC_REAL, TRC_IMAG, TRC_R, TRC_X, TRC_Q, TRC_OFF
+  static const char cmd_type_list[] = "logmag|phase|delay|smith|polar|linear|swr|real|imag|r|x|q|off";
   int type = get_str_index(argv[1], cmd_type_list);
   if (type >= 0) {
     set_trace_type(t, type);
diff --git a/nanovna.h b/nanovna.h
index a86f5a9..ee7875e 100644
--- a/nanovna.h
+++ b/nanovna.h
@@ -230,10 +230,10 @@ extern const uint16_t numfont16x22[];
 // trace 
 #define MAX_TRACE_TYPE 12
 enum trace_type {
-  TRC_LOGMAG=0, TRC_PHASE, TRC_DELAY, TRC_SMITH, TRC_POLAR, TRC_LINEAR, TRC_SWR, TRC_REAL, TRC_IMAG, TRC_R, TRC_X, TRC_OFF
+  TRC_LOGMAG=0, TRC_PHASE, TRC_DELAY, TRC_SMITH, TRC_POLAR, TRC_LINEAR, TRC_SWR, TRC_REAL, TRC_IMAG, TRC_R, TRC_X, TRC_Q, TRC_OFF
 };
 // Mask for define rectangular plot
-#define RECTANGULAR_GRID_MASK ((1<<TRC_LOGMAG)|(1<<TRC_PHASE)|(1<<TRC_DELAY)|(1<<TRC_LINEAR)|(1<<TRC_SWR)|(1<<TRC_REAL)|(1<<TRC_IMAG)|(1<<TRC_R)|(1<<TRC_X))
+#define RECTANGULAR_GRID_MASK ((1<<TRC_LOGMAG)|(1<<TRC_PHASE)|(1<<TRC_DELAY)|(1<<TRC_LINEAR)|(1<<TRC_SWR)|(1<<TRC_REAL)|(1<<TRC_IMAG)|(1<<TRC_R)|(1<<TRC_X)|(1<<TRC_Q))
 
 // LOGMAG: SCALE, REFPOS, REFVAL
 // PHASE: SCALE, REFPOS, REFVAL
diff --git a/plot.c b/plot.c
index 4008491..8ed9216 100644
--- a/plot.c
+++ b/plot.c
@@ -491,6 +491,14 @@ reactance(const float *v)
   return zi;
 }
 
+static float
+qualityfactor(const float *v)
+{
+  float i = 2*v[1];
+  float r = (1+v[0])*(1-v[0]) - v[1]*v[1];
+  return fabs(i / r);
+}
+
 static void
 cartesian_scale(float re, float im, int *xp, int *yp, float scale)
 {
@@ -551,6 +559,9 @@ trace_into_index(int t, int i, float array[POINTS_COUNT][2])
   case TRC_X:
     v-= reactance(coeff) * scale;
     break;
+  case TRC_Q:
+    v-= qualityfactor(coeff) * scale;
+    break;
   case TRC_SMITH:
   //case TRC_ADMIT:
   case TRC_POLAR:
@@ -653,6 +664,10 @@ trace_get_value_string(int t, char *buf, int len, float array[POINTS_COUNT][2],
     format = "%.2F"S_OHM;
     v = reactance(coeff);
     break;
+  case TRC_Q:
+    format = "%.1f";
+    v = qualityfactor(coeff);
+    break;
   case TRC_SMITH:
     format_smith_value(buf, len, coeff, frequencies[i]);
     return;
@@ -713,6 +728,10 @@ trace_get_value_string_delta(int t, char *buf, int len, float array[POINTS_COUNT
     format = "%.2F"S_OHM;
     v = reactance(coeff);
     break;
+  case TRC_Q:
+    format = "%.1f";
+    v = qualityfactor(coeff);
+    break;
   //case TRC_ADMIT:
   case TRC_POLAR:
     plot_printf(buf, len, "%.2f%+.2fj", coeff[0], coeff[1]);
diff --git a/ui.c b/ui.c
index a5514c9..cd60f74 100644
--- a/ui.c
+++ b/ui.c
@@ -908,6 +908,7 @@ const menuitem_t menu_format2[] = {
   { MT_CALLBACK, TRC_IMAG, "IMAG", menu_format_cb },
   { MT_CALLBACK, TRC_R, "RESISTANCE", menu_format_cb },
   { MT_CALLBACK, TRC_X, "REACTANCE", menu_format_cb },
+  { MT_CALLBACK, TRC_Q, "Q FACTOR", menu_format_cb },
   { MT_CANCEL, 0, S_LARROW" BACK", NULL },
   { MT_NONE, 0, NULL, NULL } // sentinel
 };
@@ -1170,7 +1171,7 @@ menu_invoke(int item)
 }
 
 // Maximum menu buttons count
-#define MENU_BUTTON_MAX     7
+#define MENU_BUTTON_MAX     8
 // Menu buttons size
 #define MENU_BUTTON_WIDTH  60
 #define MENU_BUTTON_HEIGHT 30
@@ -1540,8 +1541,8 @@ leave_ui_mode()
   } else if (ui_mode == UI_NUMERIC) {
     request_to_draw_cells_behind_numeric_input();
     erase_numeric_input();
-    draw_frequencies();
   }
+  draw_frequencies();
 }
 
 static void