diff --git a/radio/src/pulses/dsm2_arm.cpp b/radio/src/pulses/dsm2_arm.cpp
index 94224319c..176312cd8 100644
--- a/radio/src/pulses/dsm2_arm.cpp
+++ b/radio/src/pulses/dsm2_arm.cpp
@@ -64,7 +64,7 @@ void sendByteDsm2(uint8_t b) // max 10 changes 0 10 10 10 10 1
     }
     b = (b>>1) | 0x80; // shift in stop bit
   }
-  _send_1(len+BITLEN_DSM2); // stop bit
+  _send_1(len); // stop bit (len is already BITLEN_DSM2)
 }
 
 void putDsm2Flush()
@@ -118,7 +118,7 @@ void setupPulsesDSM2(uint8_t port)
   modulePulsesData[EXTERNAL_MODULE].dsm2.serialByte = 0 ;
   modulePulsesData[EXTERNAL_MODULE].dsm2.serialBitCount = 0 ;
 #else
-  modulePulsesData[EXTERNAL_MODULE].dsm2.index = 1;
+  modulePulsesData[EXTERNAL_MODULE].dsm2.index = 0;
   modulePulsesData[EXTERNAL_MODULE].dsm2.rest = 44000;
 #endif
 
diff --git a/radio/src/pulses/multi_arm.cpp b/radio/src/pulses/multi_arm.cpp
index 00d4cd125..454fde987 100644
--- a/radio/src/pulses/multi_arm.cpp
+++ b/radio/src/pulses/multi_arm.cpp
@@ -87,7 +87,7 @@ static void sendByteMulti(uint8_t b) //max 11 changes 0 10 10 10 10 P 1
     if (i==7)
         b = b ^ parity; // lowest bit is one from previous line
   }
-  _send_level(len+2*BITLEN_MULTI); // 2Stop bits
+  _send_level(len+ BITLEN_MULTI); // enlarge the last bit to be two stop bits long
 }
 #endif
 
@@ -106,7 +106,7 @@ void setupPulsesMultimodule(uint8_t port)
   modulePulsesData[EXTERNAL_MODULE].dsm2.serialBitCount = 0 ;
 #else
   modulePulsesData[EXTERNAL_MODULE].dsm2.rest = 18000;  // 9ms refresh
-  modulePulsesData[EXTERNAL_MODULE].dsm2.index = 1;
+  modulePulsesData[EXTERNAL_MODULE].dsm2.index = 0;
 #endif
 
   modulePulsesData[EXTERNAL_MODULE].dsm2.ptr = modulePulsesData[EXTERNAL_MODULE].dsm2.pulses;