Disable TX_TIME when no RTCLOCK on board

radio/src/gui/menus.cpp

@@ -1428,6 +1428,11 @@ bool isTelemetrySourceAvailable(int source)
     return false;
 #endif
 
+#if !defined(RTCLOCK)
+  if (source == TELEM_TX_TIME)
+    return false;
+#endif
+
   if (source >= TELEM_RESERVE1 && source <= TELEM_RESERVE5)
     return false;
 

radio/src/lcd.cpp

@@ -1198,7 +1198,7 @@ const pm_uint8_t bchunit_ar[] PROGMEM = {
 void putsTelemetryChannel(xcoord_t x, uint8_t y, uint8_t channel, lcdint_t val, uint8_t att)
 {
   switch (channel) {
-#if defined(CPUARM)
+#if defined(CPUARM) && defined(RTCLOCK)
     case TELEM_TX_TIME-1:
     {
       gtm t;

radio/src/opentx.cpp

@@ -1298,7 +1298,7 @@ getvalue_t getValue(uint8_t i)
 #endif
 
   else if (i==MIXSRC_FIRST_TELEM-1+TELEM_TX_VOLTAGE) return g_vbat100mV;
-#if defined(CPUARM)
+#if defined(CPUARM) && defined(RTCLOCK)
   else if (i==MIXSRC_FIRST_TELEM-1+TELEM_TX_TIME) {
     struct gtm t;
     gettime(&t);