diff --git a/radio/src/pulses/pxx_arm.cpp b/radio/src/pulses/pxx_arm.cpp
index cbb4f4585..b0f15155e 100644
--- a/radio/src/pulses/pxx_arm.cpp
+++ b/radio/src/pulses/pxx_arm.cpp
@@ -134,7 +134,7 @@ void pxxPutPcmTail(uint8_t port)
 #else
 void pxxPutPcmPart(uint8_t port, uint8_t value)
 {
-  pulse_duration_t duration = value ? 48 : 32;
+  pulse_duration_t duration = value ? 47 : 31;
   *modulePulsesData[port].pxx.ptr++ = duration;
   modulePulsesData[port].pxx.rest -= duration + 1;
 }