diff --git a/src/modules/RFM9x/RFM95.cpp b/src/modules/RFM9x/RFM95.cpp
index 98dbdd1a..640645da 100644
--- a/src/modules/RFM9x/RFM95.cpp
+++ b/src/modules/RFM9x/RFM95.cpp
@@ -42,10 +42,10 @@ int16_t RFM95::begin(float freq, float bw, uint8_t sf, uint8_t cr, uint8_t syncW
 
 int16_t RFM95::beginFSK(float freq, float br, float freqDev, float rxBw, int8_t power, uint16_t preambleLength, bool enableOOK) {
   // execute common part
-  int16_t state = SX127x::beginFSK(RADIOLIB_RFM9X_CHIP_VERSION_OFFICIAL, br, freqDev, rxBw, preambleLength, enableOOK);
+  int16_t state = SX127x::beginFSK(RADIOLIB_RFM9X_CHIP_VERSION_OFFICIAL, freqDev, rxBw, preambleLength, enableOOK);
   if(state == RADIOLIB_ERR_CHIP_NOT_FOUND) {
     // SX127X_REG_VERSION might be set 0x12
-    state = SX127x::beginFSK(RADIOLIB_RFM9X_CHIP_VERSION_UNOFFICIAL, br, freqDev, rxBw, preambleLength, enableOOK);
+    state = SX127x::beginFSK(RADIOLIB_RFM9X_CHIP_VERSION_UNOFFICIAL, freqDev, rxBw, preambleLength, enableOOK);
     RADIOLIB_ASSERT(state);
   } else if(state != RADIOLIB_ERR_NONE) {
     // some other error
@@ -62,6 +62,9 @@ int16_t RFM95::beginFSK(float freq, float br, float freqDev, float rxBw, int8_t
   state = setFrequency(freq);
   RADIOLIB_ASSERT(state);
 
+  state = setBitRate(br);
+  RADIOLIB_ASSERT(state);
+
   state = setOutputPower(power);
   RADIOLIB_ASSERT(state);
 
diff --git a/src/modules/RFM9x/RFM96.cpp b/src/modules/RFM9x/RFM96.cpp
index c2b4230a..78427b71 100644
--- a/src/modules/RFM9x/RFM96.cpp
+++ b/src/modules/RFM9x/RFM96.cpp
@@ -43,10 +43,10 @@ int16_t RFM96::begin(float freq, float bw, uint8_t sf, uint8_t cr, uint8_t syncW
 
 int16_t RFM96::beginFSK(float freq, float br, float freqDev, float rxBw, int8_t power, uint16_t preambleLength, bool enableOOK) {
   // execute common part
-  int16_t state = SX127x::beginFSK(RADIOLIB_RFM9X_CHIP_VERSION_OFFICIAL, br, freqDev, rxBw, preambleLength, enableOOK);
+  int16_t state = SX127x::beginFSK(RADIOLIB_RFM9X_CHIP_VERSION_OFFICIAL, freqDev, rxBw, preambleLength, enableOOK);
   if(state == RADIOLIB_ERR_CHIP_NOT_FOUND) {
     // SX127X_REG_VERSION might be set 0x12
-    state = SX127x::beginFSK(RADIOLIB_RFM9X_CHIP_VERSION_UNOFFICIAL, br, freqDev, rxBw, preambleLength, enableOOK);
+    state = SX127x::beginFSK(RADIOLIB_RFM9X_CHIP_VERSION_UNOFFICIAL, freqDev, rxBw, preambleLength, enableOOK);
     RADIOLIB_ASSERT(state);
   } else if(state != RADIOLIB_ERR_NONE) {
     // some other error
@@ -63,6 +63,9 @@ int16_t RFM96::beginFSK(float freq, float br, float freqDev, float rxBw, int8_t
   state = setFrequency(freq);
   RADIOLIB_ASSERT(state);
 
+  state = setBitRate(br);
+  RADIOLIB_ASSERT(state);
+
   state = setOutputPower(power);
   RADIOLIB_ASSERT(state);
 
diff --git a/src/modules/SX127x/SX1272.cpp b/src/modules/SX127x/SX1272.cpp
index 5c8722e4..27a01722 100644
--- a/src/modules/SX127x/SX1272.cpp
+++ b/src/modules/SX127x/SX1272.cpp
@@ -38,7 +38,7 @@ int16_t SX1272::begin(float freq, float bw, uint8_t sf, uint8_t cr, uint8_t sync
 
 int16_t SX1272::beginFSK(float freq, float br, float freqDev, float rxBw, int8_t power, uint16_t preambleLength, bool enableOOK) {
   // execute common part
-  int16_t state = SX127x::beginFSK(RADIOLIB_SX1272_CHIP_VERSION, br, freqDev, rxBw, preambleLength, enableOOK);
+  int16_t state = SX127x::beginFSK(RADIOLIB_SX1272_CHIP_VERSION, freqDev, rxBw, preambleLength, enableOOK);
   RADIOLIB_ASSERT(state);
 
   // configure settings not accessible by API
@@ -49,6 +49,9 @@ int16_t SX1272::beginFSK(float freq, float br, float freqDev, float rxBw, int8_t
   state = setFrequency(freq);
   RADIOLIB_ASSERT(state);
 
+  state = setBitRate(br);
+  RADIOLIB_ASSERT(state);
+
   state = setOutputPower(power);
   RADIOLIB_ASSERT(state);
 
@@ -216,6 +219,10 @@ int16_t SX1272::setCodingRate(uint8_t cr) {
   return(state);
 }
 
+int16_t SX1272::setBitRate(float br) {
+  return(SX127x::setBitRateCommon(br, RADIOLIB_SX1272_REG_BIT_RATE_FRAC));
+}
+
 int16_t SX1272::setOutputPower(int8_t power, bool useRfo) {
   // check allowed power range
   if(useRfo) {
diff --git a/src/modules/SX127x/SX1272.h b/src/modules/SX127x/SX1272.h
index 3c74c6da..ccd21fdb 100644
--- a/src/modules/SX127x/SX1272.h
+++ b/src/modules/SX127x/SX1272.h
@@ -197,6 +197,15 @@ class SX1272: public SX127x {
     */
     int16_t setCodingRate(uint8_t cr);
 
+    /*!
+      \brief Sets FSK bit rate. Allowed values range from 0.5 to 300 kbps. Only available in FSK mode.
+
+      \param br Bit rate to be set (in kbps).
+
+      \returns \ref status_codes
+    */
+    int16_t setBitRate(float br) override;
+
     /*!
       \brief Sets transmission output power. Allowed values range from -1 to 14 dBm (RFO pin) or +2 to +20 dBm (PA_BOOST pin).
 
diff --git a/src/modules/SX127x/SX1276.cpp b/src/modules/SX127x/SX1276.cpp
index c4c32f9c..c4e98502 100644
--- a/src/modules/SX127x/SX1276.cpp
+++ b/src/modules/SX127x/SX1276.cpp
@@ -34,7 +34,7 @@ int16_t SX1276::begin(float freq, float bw, uint8_t sf, uint8_t cr, uint8_t sync
 
 int16_t SX1276::beginFSK(float freq, float br, float freqDev, float rxBw, int8_t power, uint16_t preambleLength, bool enableOOK) {
   // execute common part
-  int16_t state = SX127x::beginFSK(RADIOLIB_SX1278_CHIP_VERSION, br, freqDev, rxBw, preambleLength, enableOOK);
+  int16_t state = SX127x::beginFSK(RADIOLIB_SX1278_CHIP_VERSION, freqDev, rxBw, preambleLength, enableOOK);
   RADIOLIB_ASSERT(state);
 
   // configure settings not accessible by API
@@ -45,6 +45,9 @@ int16_t SX1276::beginFSK(float freq, float br, float freqDev, float rxBw, int8_t
   state = setFrequency(freq);
   RADIOLIB_ASSERT(state);
 
+  state = setBitRate(br);
+  RADIOLIB_ASSERT(state);
+
   state = setOutputPower(power);
   RADIOLIB_ASSERT(state);
 
diff --git a/src/modules/SX127x/SX1277.cpp b/src/modules/SX127x/SX1277.cpp
index 59250e45..c66c8f43 100644
--- a/src/modules/SX127x/SX1277.cpp
+++ b/src/modules/SX127x/SX1277.cpp
@@ -34,7 +34,7 @@ int16_t SX1277::begin(float freq, float bw, uint8_t sf, uint8_t cr, uint8_t sync
 
 int16_t SX1277::beginFSK(float freq, float br, float freqDev, float rxBw, int8_t power, uint16_t preambleLength, bool enableOOK) {
   // execute common part
-  int16_t state = SX127x::beginFSK(RADIOLIB_SX1278_CHIP_VERSION, br, freqDev, rxBw, preambleLength, enableOOK);
+  int16_t state = SX127x::beginFSK(RADIOLIB_SX1278_CHIP_VERSION, freqDev, rxBw, preambleLength, enableOOK);
   RADIOLIB_ASSERT(state);
 
   // configure settings not accessible by API
@@ -45,6 +45,9 @@ int16_t SX1277::beginFSK(float freq, float br, float freqDev, float rxBw, int8_t
   state = setFrequency(freq);
   RADIOLIB_ASSERT(state);
 
+  state = setBitRate(br);
+  RADIOLIB_ASSERT(state);
+
   state = setOutputPower(power);
   RADIOLIB_ASSERT(state);
 
diff --git a/src/modules/SX127x/SX1278.cpp b/src/modules/SX127x/SX1278.cpp
index 0feb05fc..c8e5832a 100644
--- a/src/modules/SX127x/SX1278.cpp
+++ b/src/modules/SX127x/SX1278.cpp
@@ -38,7 +38,7 @@ int16_t SX1278::begin(float freq, float bw, uint8_t sf, uint8_t cr, uint8_t sync
 
 int16_t SX1278::beginFSK(float freq, float br, float freqDev, float rxBw, int8_t power, uint16_t preambleLength, bool enableOOK) {
   // execute common part
-  int16_t state = SX127x::beginFSK(RADIOLIB_SX1278_CHIP_VERSION, br, freqDev, rxBw, preambleLength, enableOOK);
+  int16_t state = SX127x::beginFSK(RADIOLIB_SX1278_CHIP_VERSION, freqDev, rxBw, preambleLength, enableOOK);
   RADIOLIB_ASSERT(state);
 
   // configure settings not accessible by API
@@ -49,6 +49,9 @@ int16_t SX1278::beginFSK(float freq, float br, float freqDev, float rxBw, int8_t
   state = setFrequency(freq);
   RADIOLIB_ASSERT(state);
 
+  state = setBitRate(br);
+  RADIOLIB_ASSERT(state);
+
   state = setOutputPower(power);
   RADIOLIB_ASSERT(state);
 
@@ -230,6 +233,10 @@ int16_t SX1278::setCodingRate(uint8_t cr) {
   return(state);
 }
 
+int16_t SX1278::setBitRate(float br) {
+  return(SX127x::setBitRateCommon(br, RADIOLIB_SX1278_REG_BIT_RATE_FRAC));
+}
+
 int16_t SX1278::setOutputPower(int8_t power, bool useRfo) {
   // check allowed power range
   if(useRfo) {
diff --git a/src/modules/SX127x/SX1278.h b/src/modules/SX127x/SX1278.h
index 6db1b516..92273a19 100644
--- a/src/modules/SX127x/SX1278.h
+++ b/src/modules/SX127x/SX1278.h
@@ -14,7 +14,7 @@
 #define RADIOLIB_SX1278_REG_TCXO                               0x4B
 #define RADIOLIB_SX1278_REG_PA_DAC                             0x4D
 #define RADIOLIB_SX1278_REG_FORMER_TEMP                        0x5B
-#define RADIOLIB_SX1278_REG_REG_BIT_RATE_FRAC                  0x5D
+#define RADIOLIB_SX1278_REG_BIT_RATE_FRAC                      0x5D
 #define RADIOLIB_SX1278_REG_AGC_REF                            0x61
 #define RADIOLIB_SX1278_REG_AGC_THRESH_1                       0x62
 #define RADIOLIB_SX1278_REG_AGC_THRESH_2                       0x63
@@ -205,6 +205,15 @@ class SX1278: public SX127x {
     */
     int16_t setCodingRate(uint8_t cr);
 
+    /*!
+      \brief Sets FSK bit rate. Allowed values range from 0.5 to 300 kbps. Only available in FSK mode.
+
+      \param br Bit rate to be set (in kbps).
+
+      \returns \ref status_codes
+    */
+    int16_t setBitRate(float br) override;
+
     /*!
       \brief Sets transmission output power. Allowed values range from -3 to 15 dBm (RFO pin) or +2 to +17 dBm (PA_BOOST pin).
       High power +20 dBm operation is also supported, on the PA_BOOST pin.
diff --git a/src/modules/SX127x/SX1279.cpp b/src/modules/SX127x/SX1279.cpp
index 1eac9dc9..1f0237bb 100644
--- a/src/modules/SX127x/SX1279.cpp
+++ b/src/modules/SX127x/SX1279.cpp
@@ -34,7 +34,7 @@ int16_t SX1279::begin(float freq, float bw, uint8_t sf, uint8_t cr, uint8_t sync
 
 int16_t SX1279::beginFSK(float freq, float br, float freqDev, float rxBw, int8_t power, uint16_t preambleLength, bool enableOOK) {
   // execute common part
-  int16_t state = SX127x::beginFSK(RADIOLIB_SX1278_CHIP_VERSION, br, freqDev, rxBw, preambleLength, enableOOK);
+  int16_t state = SX127x::beginFSK(RADIOLIB_SX1278_CHIP_VERSION, freqDev, rxBw, preambleLength, enableOOK);
   RADIOLIB_ASSERT(state);
 
   // configure settings not accessible by API
@@ -45,6 +45,9 @@ int16_t SX1279::beginFSK(float freq, float br, float freqDev, float rxBw, int8_t
   state = setFrequency(freq);
   RADIOLIB_ASSERT(state);
 
+  state = setBitRate(br);
+  RADIOLIB_ASSERT(state);
+
   state = setOutputPower(power);
   RADIOLIB_ASSERT(state);
 
diff --git a/src/modules/SX127x/SX127x.cpp b/src/modules/SX127x/SX127x.cpp
index e80aeb20..0dc1cbb4 100644
--- a/src/modules/SX127x/SX127x.cpp
+++ b/src/modules/SX127x/SX127x.cpp
@@ -56,7 +56,7 @@ int16_t SX127x::begin(uint8_t chipVersion, uint8_t syncWord, uint16_t preambleLe
   return(state);
 }
 
-int16_t SX127x::beginFSK(uint8_t chipVersion, float br, float freqDev, float rxBw, uint16_t preambleLength, bool enableOOK) {
+int16_t SX127x::beginFSK(uint8_t chipVersion, float freqDev, float rxBw, uint16_t preambleLength, bool enableOOK) {
   // set module properties
   _mod->init();
   _mod->pinMode(_mod->getIrq(), INPUT);
@@ -85,10 +85,6 @@ int16_t SX127x::beginFSK(uint8_t chipVersion, float br, float freqDev, float rxB
   state = setOOK(enableOOK);
   RADIOLIB_ASSERT(state);
 
-  // set bit rate
-  state = SX127x::setBitRate(br);
-  RADIOLIB_ASSERT(state);
-
   // set frequency deviation
   state = SX127x::setFrequencyDeviation(freqDev);
   RADIOLIB_ASSERT(state);
@@ -828,7 +824,7 @@ float SX127x::getDataRate() const {
   return(_dataRate);
 }
 
-int16_t SX127x::setBitRate(float br) {
+int16_t SX127x::setBitRateCommon(float br, uint8_t fracRegAddr) {
   // check active modem
   if(getActiveModem() != RADIOLIB_SX127X_FSK_OOK) {
     return(RADIOLIB_ERR_WRONG_MODEM);
@@ -851,7 +847,13 @@ int16_t SX127x::setBitRate(float br) {
   state = _mod->SPIsetRegValue(RADIOLIB_SX127X_REG_BITRATE_MSB, (bitRate & 0xFF00) >> 8, 7, 0);
   state |= _mod->SPIsetRegValue(RADIOLIB_SX127X_REG_BITRATE_LSB, bitRate & 0x00FF, 7, 0);
 
-  /// \todo fractional part of bit rate setting (not in OOK)
+  // set fractional part of bit rate
+  if(!_ook) {
+    float bitRateRem = ((RADIOLIB_SX127X_CRYSTAL_FREQ * 1000.0) / (float)br) - (float)bitRate;
+    uint8_t bitRateFrac = bitRateRem * 16;
+    state |= _mod->SPIsetRegValue(fracRegAddr, bitRateFrac, 7, 0);
+  }
+
   if(state == RADIOLIB_ERR_NONE) {
     SX127x::_br = br;
   }
diff --git a/src/modules/SX127x/SX127x.h b/src/modules/SX127x/SX127x.h
index 5a4e9278..a6faa65f 100644
--- a/src/modules/SX127x/SX127x.h
+++ b/src/modules/SX127x/SX127x.h
@@ -624,8 +624,6 @@ class SX127x: public PhysicalLayer {
 
       \param chipVersion Value in SPI version register. Used to verify the connection and hardware version.
 
-      \param br Bit rate of the FSK transmission in kbps (kilobits per second).
-
       \param freqDev Frequency deviation of the FSK transmission in kHz.
 
       \param rxBw Receiver bandwidth in kHz.
@@ -636,7 +634,7 @@ class SX127x: public PhysicalLayer {
 
       \returns \ref status_codes
     */
-    int16_t beginFSK(uint8_t chipVersion, float br, float freqDev, float rxBw, uint16_t preambleLength, bool enableOOK);
+    int16_t beginFSK(uint8_t chipVersion, float freqDev, float rxBw, uint16_t preambleLength, bool enableOOK);
 
     /*!
       \brief Binary transmit method. Will transmit arbitrary binary data up to 255 bytes long using %LoRa or up to 63 bytes using FSK modem.
@@ -925,15 +923,6 @@ class SX127x: public PhysicalLayer {
     */
     float getDataRate() const;
 
-    /*!
-      \brief Sets FSK bit rate. Allowed values range from 0.5 to 300 kbps. Only available in FSK mode.
-
-      \param br Bit rate to be set (in kbps).
-
-      \returns \ref status_codes
-    */
-    int16_t setBitRate(float br);
-
     /*!
       \brief Sets FSK frequency deviation from carrier frequency. Allowed values depend on bit rate setting and must be lower than 200 kHz. Only available in FSK mode.
 
@@ -1298,6 +1287,7 @@ class SX127x: public PhysicalLayer {
     size_t _packetLength = 0;
 
     int16_t setFrequencyRaw(float newFreq);
+    int16_t setBitRateCommon(float br, uint8_t fracRegAddr);
     int16_t config();
     int16_t configFSK();
     int16_t getActiveModem();