diff --git a/radio/src/gui/menu_model.cpp b/radio/src/gui/menu_model.cpp
index 6f2309e1b..2954cc5d8 100644
--- a/radio/src/gui/menu_model.cpp
+++ b/radio/src/gui/menu_model.cpp
@@ -5582,18 +5582,14 @@ void menuModelTelemetry(uint8_t event)
           lineIndex = k-ITEM_TELEMETRY_SCREEN_LINE5;
         }
 
-#if 0
-        putsStrIdx(0, y, PSTR(INDENT"Line"), lineIndex+1, m_posHorz<0 ? attr : 0);
-#endif
-
 #if defined(GAUGES)
         if (IS_BARS_SCREEN(screenIndex)) {
           FrSkyBarData & bar = g_model.frsky.screens[screenIndex].bars[lineIndex];
           uint8_t barSource = bar.source;
           lcd_putsiAtt(TELEM_COL1, y, STR_VTELEMCHNS, barSource, m_posHorz==0 ? attr : 0);
           if (barSource) {
-            putsTelemetryChannel(TELEM_BARS_COLMIN, y, barSource-1, convertTelemValue(barSource, bar.barMin), (m_posHorz==1 ? attr : 0) | LEFT);
-            putsTelemetryChannel(TELEM_BARS_COLMAX, y, barSource-1, convertTelemValue(barSource, 255-bar.barMax), (m_posHorz==2 ? attr : 0) | LEFT);
+            putsTelemetryChannel(TELEM_BARS_COLMIN, y, barSource-1, convertBarTelemValue(barSource, bar.barMin), (m_posHorz==1 ? attr : 0) | LEFT);
+            putsTelemetryChannel(TELEM_BARS_COLMAX, y, barSource-1, convertBarTelemValue(barSource, 255-bar.barMax), (m_posHorz==2 ? attr : 0) | LEFT);
           }
           else if (attr) {
             MOVE_CURSOR_FROM_HERE();
@@ -5604,14 +5600,14 @@ void menuModelTelemetry(uint8_t event)
                 bar.source = checkIncDecModel(event, barSource, 0, TELEM_DISPLAY_MAX);
                 if (checkIncDec_Ret) {
                   bar.barMin = 0;
-                  bar.barMax = 255-maxTelemValue(bar.source);
+                  bar.barMax = 255 - maxBarTelemValue(bar.source);
                 }
                 break;
               case 1:
                 bar.barMin = checkIncDec(event, bar.barMin, 0, 254-bar.barMax, EE_MODEL|NO_INCDEC_MARKS);
                 break;
               case 2:
-                bar.barMax = 255 - checkIncDec(event, 255-bar.barMax, bar.barMin+1, maxTelemValue(barSource), EE_MODEL|NO_INCDEC_MARKS);
+                bar.barMax = 255 - checkIncDec(event, 255-bar.barMax, bar.barMin+1, maxBarTelemValue(barSource), EE_MODEL|NO_INCDEC_MARKS);
                 break;
             }
           }
diff --git a/radio/src/gui/view_telemetry.cpp b/radio/src/gui/view_telemetry.cpp
index 3c62c1b02..9e9c100c6 100644
--- a/radio/src/gui/view_telemetry.cpp
+++ b/radio/src/gui/view_telemetry.cpp
@@ -214,8 +214,8 @@ void menuTelemetryFrsky(uint8_t event)
       for (int8_t i=3; i>=0; i--) {
         FrSkyBarData & bar = screen.bars[i];
         uint8_t source = bar.source;
-        getvalue_t barMin = convertTelemValue(source, bar.barMin);
-        getvalue_t barMax = convertTelemValue(source, 255-bar.barMax);
+        getvalue_t barMin = convertBarTelemValue(source, bar.barMin);
+        getvalue_t barMax = convertBarTelemValue(source, 255-bar.barMax);
         if (source && barMax > barMin) {
           uint8_t y = barHeight+6+i*(barHeight+6);
           lcd_putsiAtt(0, y+barHeight-5, STR_VTELEMCHNS, source, 0);
@@ -234,7 +234,7 @@ void menuTelemetryFrsky(uint8_t event)
             threshold = g_model.frsky.channels[source-TELEM_A1].alarms_value[0];
 #if defined(FRSKY_HUB)
           else
-            threshold = convertTelemValue(source, barsThresholds[source-TELEM_ALT]);
+            threshold = convertBarTelemValue(source, barsThresholds[source-TELEM_ALT]);
 #endif
 
           if (threshold) {
diff --git a/radio/src/opentx.cpp b/radio/src/opentx.cpp
index cdefd2577..80df58ebd 100644
--- a/radio/src/opentx.cpp
+++ b/radio/src/opentx.cpp
@@ -1854,7 +1854,7 @@ csw_telemetry_value_t maxTelemValue(uint8_t channel)
 #endif
 
 #if defined(CPUARM)
-getvalue_t convertTelemValue(uint8_t channel, csw_telemetry_value_t value)
+getvalue_t convert16bitsTelemValue(uint8_t channel, csw_telemetry_value_t value)
 {
   getvalue_t result;
   switch (channel) {
@@ -1867,8 +1867,14 @@ getvalue_t convertTelemValue(uint8_t channel, csw_telemetry_value_t value)
   }
   return result;
 }
-#else
-getvalue_t convertTelemValue(uint8_t channel, csw_telemetry_value_t value)
+
+csw_telemetry_value_t max8bitsTelemValue(uint8_t channel)
+{
+  return min<csw_telemetry_value_t>(255, maxTelemValue(channel));
+}
+#endif
+
+getvalue_t convert8bitsTelemValue(uint8_t channel, csw_telemetry_value_t value)
 {
   getvalue_t result;
   switch (channel) {
@@ -1878,6 +1884,10 @@ getvalue_t convertTelemValue(uint8_t channel, csw_telemetry_value_t value)
       break;
 #if defined(FRSKY)
     case TELEM_ALT:
+#if defined(CPUARM)
+      result = 100 * (value * 8 - 500);
+      break;
+#endif
     case TELEM_GPSALT:
     case TELEM_MAX_ALT:
     case TELEM_MIN_ALT:
@@ -1915,18 +1925,17 @@ getvalue_t convertTelemValue(uint8_t channel, csw_telemetry_value_t value)
   }
   return result;
 }
-#endif
 
 getvalue_t convertCswTelemValue(CustomSwData * cs)
 {
   getvalue_t val;
 #if defined(CPUARM)
-  val = convertTelemValue(cs->v1 - MIXSRC_FIRST_TELEM + 1, cs->v2);
+  val = convert16bitsTelemValue(cs->v1 - MIXSRC_FIRST_TELEM + 1, cs->v2);
 #else
   if (cswFamily(cs->func)==CS_VOFS)
-    val = convertTelemValue(cs->v1 - MIXSRC_FIRST_TELEM + 1, 128+cs->v2);
+    val = convert8bitsTelemValue(cs->v1 - MIXSRC_FIRST_TELEM + 1, 128+cs->v2);
   else
-    val = convertTelemValue(cs->v1 - MIXSRC_FIRST_TELEM + 1, 128+cs->v2) - convertTelemValue(cs->v1 - MIXSRC_FIRST_TELEM + 1, 128);
+    val = convert8bitsTelemValue(cs->v1 - MIXSRC_FIRST_TELEM + 1, 128+cs->v2) - convert8bitsTelemValue(cs->v1 - MIXSRC_FIRST_TELEM + 1, 128);
 #endif
   return val;
 }
diff --git a/radio/src/opentx.h b/radio/src/opentx.h
index 1ce0294b7..9c9ea12c3 100644
--- a/radio/src/opentx.h
+++ b/radio/src/opentx.h
@@ -1632,9 +1632,24 @@ extern uint8_t barsThresholds[THLD_MAX];
   #define maxTelemValue(channel) 255
 #endif
 
-getvalue_t convertTelemValue(uint8_t channel, csw_telemetry_value_t value);
+#if defined(CPUARM)
+getvalue_t convert16bitsTelemValue(uint8_t channel, csw_telemetry_value_t value);
+csw_telemetry_value_t max8bitsTelemValue(uint8_t channel);
+#endif
+
+getvalue_t convert8bitsTelemValue(uint8_t channel, csw_telemetry_value_t value);
 getvalue_t convertCswTelemValue(CustomSwData * cs);
 
+#if defined(CPUARM)
+  #define convertTelemValue(channel, value) convert16bitsTelemValue(channel, value)
+  #define convertBarTelemValue(channel, value) convert8bitsTelemValue(channel, value)
+  #define maxBarTelemValue(channel) max8bitsTelemValue(channel)
+#else
+  #define convertTelemValue(channel, value) convert8bitsTelemValue(channel, value)
+  #define convertBarTelemValue(channel, value) convert8bitsTelemValue(channel, value)
+  #define maxBarTelemValue(channel) maxTelemValue(channel)
+#endif
+
 #if defined(FRSKY) || defined(CPUARM)
 lcdint_t applyChannelRatio(uint8_t channel, lcdint_t val);
 #endif