Sporadic spur workaround

sa_cmd.c

@@ -932,11 +932,18 @@ VNA_SHELL_FUNCTION(cmd_f)
 }
 #endif
 
+//#define CORRECTION_LOW      0
+//#define CORRECTION_LNA      1
+//#define CORRECTION_LOW_ULTRA 2
+//#define CORRECTION_LNA_ULTRA 3
+//#define CORRECTION_LOW_OUT  4
+//#define CORRECTION_HIGH     5
+
 VNA_SHELL_FUNCTION(cmd_correction)
 {
   (void)argc;
 #ifdef TINYSA4
-  static const char cmd[] = "low|lna|out|high";
+  static const char cmd[] = "low|lna|ultra|ultra_lna|out|high";
   static const char range[] = "0-19";
 #else
   static const char cmd[] = "low|high";

sa_core.c

@@ -4042,14 +4042,10 @@ again:                                                              // Spur redu
       }
 #endif
       if (!in_step_test) {
-        if (my_step_delay < 250) {
-          if ((120000000 < lf && lf <124000000) ||
-              (139900000 < lf && lf <144000000) ||
-              (161400000 < lf && lf <165400000) ||
-              (182800000 < lf && lf <186800000) ||
-              (206000000 < lf && lf <209000000) )
+        if (my_step_delay < 300 && old_R == 1) {
+          if ((100000000 < lf && lf <250000000))
             my_step_delay = 300;
-        }
+        } else
         if (old_R >= 5) {
           if (my_step_delay <500)
             my_step_delay *= 6;
@@ -4352,7 +4348,7 @@ static bool sweep(bool break_on_operation)
       ili9341_set_background(LCD_BG_COLOR);
       ili9341_fill(OFFSETX+pos, CHART_BOTTOM+1, WIDTH-pos, 1);
 
-      if (local_sweep_time > 2 * ONE_SECOND_TIME) {
+      if (local_sweep_time > 10 * ONE_SECOND_TIME) {
         plot_into_index(measured);
         redraw_request |= REDRAW_CELLS | REDRAW_BATTERY;
         // plot trace and other indications as raster