diff --git a/src/main.c b/src/main.c
--- a/src/main.c
+++ b/src/main.c
@@ -138,22 +138,32 @@ int main(void)
     HAL_Delay(100);
 
     uint8_t lastMinute = 0;
+    uint16_t blink_rate = 250;
 
     while (1)
     {
         if(HAL_GetTick() - last_wspr > 500)
         {
+            if(get_hdop()[0] == '9' && get_hdop()[1] == '9')
+                blink_rate = 250;
+            else
+                blink_rate = 100;
+
             volatile uint8_t minute = get_timestamp()[3] - 0x30;
 
             // If last minute was odd and this minute is even (transition)
             if(lastMinute%2 == 1 && minute%2 == 0)
+            {
+                // Wait until the first second of the minute
+                HAL_Delay(1000);
                 encode_wspr();
+            }
 
             lastMinute = minute;
             last_wspr = HAL_GetTick();
         }
 
-        if(HAL_GetTick() - led_timer > 100)
+        if(HAL_GetTick() - led_timer > blink_rate)
         {
             HAL_GPIO_TogglePin(LED_BLUE);
             led_timer = HAL_GetTick();