diff --git a/src/Module.cpp b/src/Module.cpp
index 372ef419..48f03211 100644
--- a/src/Module.cpp
+++ b/src/Module.cpp
@@ -206,7 +206,7 @@ int16_t Module::SPIgetRegValue(uint8_t reg, uint8_t msb, uint8_t lsb) {
   return(maskedValue);
 }
 
-int16_t Module::SPIsetRegValue(uint8_t reg, uint8_t value, uint8_t msb, uint8_t lsb, uint8_t checkInterval) {
+int16_t Module::SPIsetRegValue(uint8_t reg, uint8_t value, uint8_t msb, uint8_t lsb, uint8_t checkInterval, uint8_t checkMask) {
   if((msb > 7) || (lsb > 7) || (lsb > msb)) {
     return(ERR_INVALID_BIT_RANGE);
   }
@@ -223,7 +223,7 @@ int16_t Module::SPIsetRegValue(uint8_t reg, uint8_t value, uint8_t msb, uint8_t
     uint8_t readValue = 0x00;
     while(Module::micros() - start < (checkInterval * 1000)) {
       readValue = SPIreadRegister(reg);
-      if(readValue == newValue) {
+      if((readValue & checkMask) == (newValue & checkMask)) {
         // check passed, we can stop the loop
         return(ERR_NONE);
       }
diff --git a/src/Module.h b/src/Module.h
index 685a2eb5..d81c4213 100644
--- a/src/Module.h
+++ b/src/Module.h
@@ -238,9 +238,11 @@ class Module {
 
       \param checkInterval Number of milliseconds between register writing and verification reading. Some registers need up to 10ms to process the change.
 
+      \param checkMask Mask of bits to check, only bits set to 1 will be verified.
+
       \returns \ref status_codes
     */
-    int16_t SPIsetRegValue(uint8_t reg, uint8_t value, uint8_t msb = 7, uint8_t lsb = 0, uint8_t checkInterval = 2);
+    int16_t SPIsetRegValue(uint8_t reg, uint8_t value, uint8_t msb = 7, uint8_t lsb = 0, uint8_t checkInterval = 2, uint8_t checkMask = 0xFF);
 
     /*!
       \brief SPI burst read method.
diff --git a/src/modules/SX127x/SX127x.cpp b/src/modules/SX127x/SX127x.cpp
index b4461d6b..2f6e3e87 100644
--- a/src/modules/SX127x/SX127x.cpp
+++ b/src/modules/SX127x/SX127x.cpp
@@ -1235,7 +1235,12 @@ bool SX127x::findChip(uint8_t ver) {
 }
 
 int16_t SX127x::setMode(uint8_t mode) {
-  return(_mod->SPIsetRegValue(SX127X_REG_OP_MODE, mode, 2, 0, 5));
+  uint8_t checkMask = 0xFF;
+  if((getActiveModem() == SX127X_FSK_OOK) && (mode == SX127X_RX)) {
+    // disable checking of RX bit in FSK RX mode, as it sometimes seem to fail (#276)
+    checkMask = 0xFE;
+  }
+  return(_mod->SPIsetRegValue(SX127X_REG_OP_MODE, mode, 2, 0, 5, checkMask));
 }
 
 int16_t SX127x::getActiveModem() {
diff --git a/src/protocols/RTTY/RTTY.cpp b/src/protocols/RTTY/RTTY.cpp
index 5ee05efc..f256e54b 100644
--- a/src/protocols/RTTY/RTTY.cpp
+++ b/src/protocols/RTTY/RTTY.cpp
@@ -10,7 +10,7 @@ ITA2String::ITA2String(char c) {
 
 ITA2String::ITA2String(const char* str) {
   _len = strlen(str);
-  _str = new char[_len];
+  _str = new char[_len + 1];
   strcpy(_str, str);
   _ita2Len = 0;
 }