diff --git a/radio/src/pulses/pulses_avr.cpp b/radio/src/pulses/pulses_avr.cpp
index 666dcb82b..93410bbac 100644
--- a/radio/src/pulses/pulses_avr.cpp
+++ b/radio/src/pulses/pulses_avr.cpp
@@ -308,9 +308,10 @@ void putPcmHead()
   putPcmPart( 0xC0 ) ;
 }
 
-uint16_t scaleForPXX(uint8_t i)
+uint16_t scaleForPXX( uint8_t i )
 {
-  return channelOutputs[i] * 3 / 4 + 2250 ;
+  int16_t value = ( ( i < 16 ) ? channelOutputs[i] * 3 / 4 : 0 ) + 1024;
+  return limit<uint16_t>(1, value, 2046);
 }
 
 void setupPulsesPXX()