diff --git a/openrtx/include/protocols/M17/M17Modulator.hpp b/openrtx/include/protocols/M17/M17Modulator.hpp
index 05b3a22a..de5feff7 100644
--- a/openrtx/include/protocols/M17/M17Modulator.hpp
+++ b/openrtx/include/protocols/M17/M17Modulator.hpp
@@ -83,6 +83,13 @@ public:
      */
     void stop();
 
+    /**
+     * Invert baseband signal phase before output.
+     *
+     * @param status: if set to true signal phase is inverted.
+     */
+    void invertPhase(const bool status);
+
 private:
 
     /**
@@ -113,6 +120,7 @@ private:
     streamId                     outStream;        ///< Baseband output stream ID.
     pathId                       outPath;          ///< Baseband output path ID.
     bool                         txRunning;        ///< Transmission running.
+    bool                         invPhase;        ///< Invert signal phase
 
     #if defined(PLATFORM_MD3x0) || defined(PLATFORM_MDUV3x0)
     PwmCompensator pwmComp;
diff --git a/openrtx/src/protocols/M17/M17Modulator.cpp b/openrtx/src/protocols/M17/M17Modulator.cpp
index bc0e2ab7..14fd422b 100644
--- a/openrtx/src/protocols/M17/M17Modulator.cpp
+++ b/openrtx/src/protocols/M17/M17Modulator.cpp
@@ -141,6 +141,12 @@ void M17Modulator::stop()
     #endif
 }
 
+void M17Modulator::invertPhase(const bool status)
+{
+    invPhase = status;
+}
+
+
 void M17Modulator::symbolsToBaseband()
 {
     memset(idleBuffer, 0x00, M17_FRAME_SAMPLES * sizeof(stream_sample_t));
@@ -156,8 +162,8 @@ void M17Modulator::symbolsToBaseband()
         elem          = M17::rrc_48k(elem * M17_RRC_GAIN) - M17_RRC_OFFSET;
         #if defined(PLATFORM_MD3x0) || defined(PLATFORM_MDUV3x0)
         elem          = pwmComp(elem);
-        elem         *= -1.0f;          // Invert signal phase
         #endif
+        if(invPhase) elem = 0.0f - elem;    // Invert signal phase
         idleBuffer[i] = static_cast< int16_t >(elem);
     }
 }