diff --git a/radio/src/pulses/ppm_arm.cpp b/radio/src/pulses/ppm_arm.cpp
index 851798463..65b0ce3f1 100644
--- a/radio/src/pulses/ppm_arm.cpp
+++ b/radio/src/pulses/ppm_arm.cpp
@@ -59,9 +59,9 @@ void setupPulsesPPM(unsigned int port)                   // Don't enable interru
   uint32_t pwmCh = (port == EXTERNAL_MODULE ? 3 : 1);
   pwmptr->PWM_CH_NUM[pwmCh].PWM_CDTYUPD = (g_model.moduleData[port].ppmDelay * 50 + 300) * 2; //Stoplen *2
   if (g_model.moduleData[port].ppmPulsePol)
-    pwmptr->PWM_CH_NUM[pwmCh].PWM_CMR |= 0x00000200 ;   // CPOL
-  else
     pwmptr->PWM_CH_NUM[pwmCh].PWM_CMR &= ~0x00000200 ;  // CPOL
+  else
+    pwmptr->PWM_CH_NUM[pwmCh].PWM_CMR |= 0x00000200 ;   // CPOL
 #endif
 
   uint16_t * ptr = ppmStream[port];
diff --git a/radio/src/targets/sky9x/pulses_driver.cpp b/radio/src/targets/sky9x/pulses_driver.cpp
index 91fb799d3..566fc2be2 100644
--- a/radio/src/targets/sky9x/pulses_driver.cpp
+++ b/radio/src/targets/sky9x/pulses_driver.cpp
@@ -69,7 +69,7 @@ void init_main_ppm(uint32_t period, uint32_t out_enable)
   pwmptr = PWM ;
   // PWM3 for PPM output
   pwmptr->PWM_CH_NUM[3].PWM_CMR = 0x0000000B ;                  // CLKA
-  if (g_model.moduleData[EXTERNAL_MODULE].ppmPulsePol)
+  if (!g_model.moduleData[EXTERNAL_MODULE].ppmPulsePol)
     pwmptr->PWM_CH_NUM[3].PWM_CMR |= 0x00000200 ;               // CPOL
   pwmptr->PWM_CH_NUM[3].PWM_CPDR = period ;                     // Period in half uS
   pwmptr->PWM_CH_NUM[3].PWM_CPDRUPD = period ;                  // Period in half uS
@@ -82,7 +82,7 @@ void init_main_ppm(uint32_t period, uint32_t out_enable)
   // PWM1 for PPM2
   configure_pins(PIO_PC15, PIN_PERIPHERAL | PIN_INPUT | PIN_PER_B | PIN_PORTC | PIN_NO_PULLUP ) ;
   pwmptr->PWM_CH_NUM[1].PWM_CMR = 0x0000000B ;    // CLKB
-  if (g_model.moduleData[EXTRA_MODULE].ppmPulsePol)
+  if (!g_model.moduleData[EXTRA_MODULE].ppmPulsePol)
     pwmptr->PWM_CH_NUM[1].PWM_CMR |= 0x00000200 ;   // CPOL
   pwmptr->PWM_CH_NUM[1].PWM_CPDR = period ;                       // Period
   pwmptr->PWM_CH_NUM[1].PWM_CPDRUPD = period ;            // Period