diff --git a/README.md b/README.md
index 719c64b..8fb85d0 100644
--- a/README.md
+++ b/README.md
@@ -31,9 +31,9 @@ On startup, the band will be shown (e.g. `bn.20`). After a 1s delay, the rig
 will turn on.
 
 ### Tuning
-Use the rotary encoder to tune. The default step is 50Hz. By pressing the
-rotary encoder, the step can be changed to 200Hz. Pressing again goes back to
-50Hz. These steps can be changed in `settings.h`.
+Use the rotary encoder to tune. Tuning can be done in steps of 50Hz, 200Hz,
+1kHz and 10kHz. Rotate through these steps by pressing the rotary encoder. For
+all steps except 50Hz, the corresponding digit on the display will blink.
 
 ### RIT
 Pressing the RIT button turns RIT on. The display will show the RIT offset.
@@ -94,9 +94,6 @@ There are several compile-time settings in `settings.h`. Change them before
 uploading the code to the chip.
 
 - `WPM_DEFAULT`: the default key speed in WPM (20).
-- `TUNE_STEP_DEFAULT`: the default tune step (50Hz) in mHz.
-- `TUNE_STEP_ALT`: the alternative tune step (200Hz), enabled by pressing the
-  rotary encoder.
 - `KEY_MIN_SPEED`: the minimum key speed in WPM (5). Lower speeds than 5 may
   damage the rig, because the on-time for dashes will be rather long.
 - `KEY_MAX_SPEED`: the maximum key speed in WPM (30). Higher speeds than 30 are
@@ -157,6 +154,7 @@ Some images of the connections:
 	- Fixed a bug with entering memory
 	- Minor changes to the display
 	- Made several things settings (see `settings.h`)
+	- Big steps tuning (issue [#3](issues/3))
 - 2017-04-04:
 	- Added bands up to 10m and enabled run-time band switching
 	- Fixed rotary encoder issues
diff --git a/SODA_POP/SODA_POP.h b/SODA_POP/SODA_POP.h
index ddd660e..4ef8d12 100644
--- a/SODA_POP/SODA_POP.h
+++ b/SODA_POP/SODA_POP.h
@@ -37,6 +37,7 @@ struct soda_pop {
   unsigned long rit_tx_freq;
 
   unsigned char rit:1;
+  unsigned char tuning_step:2;
 
   struct display display;
   struct inputs inputs;
@@ -47,6 +48,9 @@ static unsigned long tcount;
 
 static char buffer[MEMORY_LENGTH];
 
+const long tuning_steps[] = {5000, 20000, 100000, 1000000};
+const byte tuning_blinks[] = {BLINK_NONE, BLINK_0, BLINK_1, BLINK_2};
+
 #define TX_FREQ(state) (state.rit ? state.rit_tx_freq : state.op_freq)
 
 #define SIDETONE_ENABLE() {tone(A2, SIDETONE_FREQ);}
diff --git a/SODA_POP/SODA_POP.ino b/SODA_POP/SODA_POP.ino
index c7e3a7c..ea8b06b 100644
--- a/SODA_POP/SODA_POP.ino
+++ b/SODA_POP/SODA_POP.ino
@@ -53,24 +53,6 @@ Si5351 si5351;
 #define SLED2 11
 #define SLED1 12
 
-const byte LED_DIGITS[] =
-  { LED_N_0, LED_N_1, LED_N_2, LED_N_3, LED_N_4
-  , LED_N_5, LED_N_6, LED_N_7, LED_N_8, LED_N_9};
-
-//flag definitions
-
-#define CSflag    B00000001
-#define SK_EN     0x10
-#define MEM_EN    0x80
-#define MEM_EN_CL 0x7f
-#define UPflag    0x01
-#define DWNflag   0x02
-
-#define R_sw  6
-#define K_sw  7
-#define E_sw  2
-#define SK_FG 4
-
 #define SI5351_CLK_RX SI5351_CLK0
 #define SI5351_CLK_TX SI5351_CLK1
 
@@ -81,6 +63,10 @@ const byte LED_DIGITS[] =
 
 #define IF_DEFAULT 491480000
 
+const byte LED_DIGITS[] =
+  { LED_N_0, LED_N_1, LED_N_2, LED_N_3, LED_N_4
+  , LED_N_5, LED_N_6, LED_N_7, LED_N_8, LED_N_9};
+
 // register names
 byte memory_pointer;
 
@@ -89,10 +75,6 @@ const int   TXEN = 13; // production A0
 const int   DASHin = A0;
 const int   DOTin = A1;
 
-//frequency tuning
-int         stepSize;   // tuning rate pointer
-long int    stepK;      // temp storage of freq tuning step
-
 unsigned long IFfreq;
 long          cal_value = 15000;
 
@@ -144,8 +126,7 @@ void setup()
 
   cal_data(); //load calibration data
   si5351.set_correction(cal_value); //correct the clock chip error
-  stepK = TUNE_STEP_DEFAULT;
-  stepSize = 0;
+  state.tuning_step = 0;
   setup_band();
   invalidate_display();
   delay(1000);
@@ -156,6 +137,8 @@ void setup()
 
   if (digitalRead(DASHin) == LOW)
     state.key.mode = KEY_STRAIGHT;
+
+  state.display.blinking = BLINK_1;
 }
 
 void loop()
@@ -188,9 +171,9 @@ void loop_default()
     state.state = S_KEYING;
   // Tuning with the rotary encoder
   } else if (rotated_up()) {
-    freq_adjust(stepK);
+    freq_adjust(tuning_steps[state.tuning_step]);
   } else if (rotated_down()) {
-    freq_adjust(-((int) stepK));
+    freq_adjust(-tuning_steps[state.tuning_step]);
   } else if (state.inputs.encoder_button) {
     nextFstep();
     debounce_encoder_button();
@@ -304,6 +287,7 @@ void loop_mem_enter_wait()
   if (state.inputs.keyer || state.key.mode != KEY_IAMBIC) {
     state.state = S_DEFAULT;
     invalidate_display();
+    morse(MX);
     debounce_keyer();
   } else if (key_active()) {
     state.state = S_MEM_ENTER;
@@ -443,7 +427,7 @@ void loop_calibration_peak_rx()
 }
 
 // adjust the operating frequency
-void freq_adjust(int step)
+void freq_adjust(long step)
 {
   state.op_freq += step;
   if (state.op_freq > BAND_LIMITS_HIGH[state.band])
@@ -457,9 +441,10 @@ void freq_adjust(int step)
 //toggle tuning step rate
 void nextFstep()
 {
-  stepSize = (stepSize + 1) % 2;
-  stepK = stepSize ? TUNE_STEP_ALT : TUNE_STEP_DEFAULT;
-  toggle_digit(0);
+  state.tuning_step++;
+  if (state.tuning_step >= sizeof(tuning_steps))
+    state.tuning_step = 0;
+  invalidate_display();
 }
 
 /*
diff --git a/SODA_POP/display.h b/SODA_POP/display.h
index 9d51b3b..f325dc1 100644
--- a/SODA_POP/display.h
+++ b/SODA_POP/display.h
@@ -4,9 +4,16 @@
 #include "SODA_POP.h"
 #include "segments.h"
 
+#define BLINK_NONE 0
+#define BLINK_0 1
+#define BLINK_1 2
+#define BLINK_2 3
+#define BLINK_3 4
+
 struct display {
   byte digits[4];
   byte dots:4;
+  byte blinking:3;
 };
 
 void display_isr(void);
diff --git a/SODA_POP/display.ino b/SODA_POP/display.ino
index 686ecde..37d23fa 100644
--- a/SODA_POP/display.ino
+++ b/SODA_POP/display.ino
@@ -1,30 +1,39 @@
 #include "display.h"
 
 volatile byte digit_counter = 0;
+
+#define BLINKED_ON ((((byte) tcount) >> 7) & 0x01)
+
 void display_isr()
 {
   digit_counter = (digit_counter + 1) % 4;
 
+  PORTD = 0x00;
+
   switch(digit_counter) {
     case 0:
-      PORTD = state.display.digits[0];
+      if (state.display.blinking != BLINK_0 || BLINKED_ON)
+        PORTD = state.display.digits[0];
       digitalWrite(SLED1, LOW);
       break;
 
     case 1:
-      PORTD = state.display.digits[1];
+      if (state.display.blinking != BLINK_1 || BLINKED_ON)
+        PORTD = state.display.digits[1];
       digitalWrite(SLED2, LOW);
       break;
 
     case 2:
-      PORTD = state.display.digits[2];
+      if (state.display.blinking != BLINK_2 || BLINKED_ON)
+        PORTD = state.display.digits[2];
       digitalWrite(SLED3, LOW);
       break;
 
     case 3:
       if (state.display.digits[3] == LED_N_0)
         state.display.digits[3] = 0x00; //blank MSD if 0
-      PORTD = state.display.digits[3];
+      if (state.display.blinking != BLINK_3 || BLINKED_ON)
+        PORTD = state.display.digits[3];
       digitalWrite(SLED4, LOW);
       break;
   }
@@ -43,6 +52,7 @@ void disable_display()
 
 void invalidate_display()
 {
+  state.display.blinking = BLINK_NONE;
   switch (state.state) {
     case S_DEFAULT:
     case S_KEYING:
@@ -167,6 +177,7 @@ void display_rit()
   state.display.digits[0] = LED_DIGITS[(offset % 1000) / 100];
 
   state.display.dots = 0x2;
+  state.display.blinking = tuning_blinks[state.tuning_step];
 }
 
 void display_freq()
@@ -179,6 +190,7 @@ void display_freq()
   state.display.digits[1] = LED_DIGITS[(frequency % 10000) / 1000];
   state.display.digits[0] = LED_DIGITS[(frequency % 1000) / 100];
   state.display.dots = 0x2;
+  state.display.blinking = tuning_blinks[state.tuning_step];
 }
 
 void display_band()
diff --git a/SODA_POP/settings.h b/SODA_POP/settings.h
index 193f22b..69a37e5 100644
--- a/SODA_POP/settings.h
+++ b/SODA_POP/settings.h
@@ -1,8 +1,5 @@
 #define WPM_DEFAULT          20 // Initial paddle speed in WPM
 
-#define TUNE_STEP_DEFAULT  5000 // Initial tune step in centi-Hz (5000 = 50Hz)
-#define TUNE_STEP_ALT     20000 // Alternative tune step
-
 #define KEY_MIN_SPEED         5 // Minimal speed in WPM
 #define KEY_MAX_SPEED        30 // Maximal speed in WPM