diff --git a/radio/src/targets/horus/extmodule_driver.cpp b/radio/src/targets/horus/extmodule_driver.cpp
index f453fa022..84572dc18 100644
--- a/radio/src/targets/horus/extmodule_driver.cpp
+++ b/radio/src/targets/horus/extmodule_driver.cpp
@@ -161,10 +161,10 @@ void extmoduleSerialStart(uint32_t /*baudrate*/, uint32_t period_half_us, bool i
   EXTMODULE_TIMER->PSC = EXTMODULE_TIMER_FREQ / 2000000 - 1; // 0.5uS (2Mhz)
 
 #if defined(PCBX10) || PCBREV >= 13
-  EXTMODULE_TIMER->CCER = TIM_CCER_CC3E | TIM_CCER_CC3P;
-  EXTMODULE_TIMER->BDTR = TIM_BDTR_MOE; // Enable outputs
   EXTMODULE_TIMER->CCR3 = 0;
+  EXTMODULE_TIMER->CCER = TIM_CCER_CC3E | TIM_CCER_CC3P;
   EXTMODULE_TIMER->CCMR2 = TIM_CCMR2_OC3M_2 | TIM_CCMR2_OC3M_0; // Force O/P high
+  EXTMODULE_TIMER->BDTR = TIM_BDTR_MOE; // Enable outputs
   EXTMODULE_TIMER->EGR = 1; // Restart
   EXTMODULE_TIMER->CCMR2 = TIM_CCMR2_OC3M_1 | TIM_CCMR2_OC3M_0;
 #else
@@ -176,7 +176,7 @@ void extmoduleSerialStart(uint32_t /*baudrate*/, uint32_t period_half_us, bool i
   EXTMODULE_TIMER->CCMR1 = TIM_CCMR1_OC1M_1 | TIM_CCMR1_OC1M_0;
 #endif
 
-  EXTMODULE_TIMER->ARR = 45000;
+  EXTMODULE_TIMER->ARR = period_half_us;
   EXTMODULE_TIMER->CCR2 = 40000; // The first frame will be sent in 20ms
   EXTMODULE_TIMER->SR &= ~TIM_SR_CC2IF; // Clear flag
   EXTMODULE_TIMER->DIER |= TIM_DIER_UDE | TIM_DIER_CC2IE;
@@ -330,7 +330,7 @@ void extmoduleSendNextFrame()
     case PROTOCOL_CHANNELS_MULTIMODULE:
       EXTMODULE_TIMER->CCR2 = *(extmodulePulsesData.dsm2.ptr - 1) - 4000; // 2mS in advance
       EXTMODULE_TIMER_DMA_STREAM->CR &= ~DMA_SxCR_EN; // Disable DMA
-      EXTMODULE_TIMER_DMA_STREAM->CR |= EXTMODULE_TIMER_DMA_CHANNEL | DMA_SxCR_DIR_0 | EXTMODULE_TIMER_DMA_SIZE | DMA_SxCR_MSIZE_1 | DMA_SxCR_PL_0 | DMA_SxCR_PL_1;
+      EXTMODULE_TIMER_DMA_STREAM->CR |= EXTMODULE_TIMER_DMA_CHANNEL | DMA_SxCR_DIR_0 | DMA_SxCR_MINC | EXTMODULE_TIMER_DMA_SIZE | DMA_SxCR_PL_0 | DMA_SxCR_PL_1;
       EXTMODULE_TIMER_DMA_STREAM->PAR = CONVERT_PTR_UINT(&EXTMODULE_TIMER->ARR);
       EXTMODULE_TIMER_DMA_STREAM->M0AR = CONVERT_PTR_UINT(extmodulePulsesData.dsm2.pulses);
       EXTMODULE_TIMER_DMA_STREAM->NDTR = extmodulePulsesData.dsm2.ptr - extmodulePulsesData.dsm2.pulses;