diff --git a/SMeter.cpp b/SMeter.cpp
index 42bdccf..c3a5486 100644
--- a/SMeter.cpp
+++ b/SMeter.cpp
@@ -19,22 +19,21 @@
 
 #include "SMeter.h"
 
+#define RSSI_S1 141U
+#define RSSI_S9 93U
+
 void CSMeter::getSignal(unsigned int rssi, unsigned int & signal, unsigned int & plus)
 {
-    signal = 0U;
-    plus = 0U;
-
-    if (rssi >= 121) { signal = 1; plus = 0; }
-    else if (rssi >= 115) { signal = 2; plus = 0; }
-    else if (rssi >= 109) { signal = 3; plus = 0; }
-    else if (rssi >= 103) { signal = 4; plus = 0; }
-    else if (rssi >= 97)  { signal = 5; plus = 0; }
-    else if (rssi >= 91)  { signal = 6; plus = 0; }
-    else if (rssi >= 85)  { signal = 7; plus = 0; }
-    else if (rssi >= 79)  { signal = 8; plus = 0; }
-    else if (rssi >= 73)  { signal = 9; plus = 0; }
-    else if (rssi >= 63)  { signal = 9; plus = 10; }
-    else if (rssi >= 53)  { signal = 9; plus = 20; }
-    else if (rssi >= 43)  { signal = 9; plus = 30; }
-    else if (rssi >= 33)  { signal = 9; plus = 40; }
+    if (rssi > RSSI_S1) {
+        signal = 0;
+        plus = 0;
+    }
+    else if (rssi >= RSSI_S9 && rssi <= RSSI_S1) {
+        signal = ((RSSI_S1 - rssi) / 6) + 1;
+        plus =0;
+    }
+    else {
+        signal = 9U;
+        plus = RSSI_S9 - rssi;
+    }
 }
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