diff --git a/src/protocols/PhysicalLayer/PhysicalLayer.cpp b/src/protocols/PhysicalLayer/PhysicalLayer.cpp
index 82d04910..722ee69f 100644
--- a/src/protocols/PhysicalLayer/PhysicalLayer.cpp
+++ b/src/protocols/PhysicalLayer/PhysicalLayer.cpp
@@ -170,10 +170,14 @@ int32_t PhysicalLayer::random(int32_t min, int32_t max) {
 
 int16_t PhysicalLayer::startDirect() {
   // disable encodings
-  int16_t state = setEncoding(0);
+  int16_t state = setEncoding(RADIOLIB_ENCODING_NRZ);
+  RADIOLIB_ASSERT(state);
+
+  // disable shaping
+  state = setDataShaping(RADIOLIB_SHAPING_NONE);
   RADIOLIB_ASSERT(state);
 
   // set frequency deviation to the lowest possible value
-  state = setFrequencyDeviation(0);
+  state = setFrequencyDeviation(-1);
   return(state);
 }