diff --git a/src/main/io/vtx_smartaudio.c b/src/main/io/vtx_smartaudio.c
index 803801ab0..08b0b3681 100644
--- a/src/main/io/vtx_smartaudio.c
+++ b/src/main/io/vtx_smartaudio.c
@@ -450,14 +450,7 @@ static void saReceiveFrame(uint8_t c)
 static void saSendFrame(uint8_t *buf, int len)
 {
     if (!IS_RC_MODE_ACTIVE(BOXVTXCONTROLDISABLE)) {
-        switch (smartAudioSerialPort->identifier) {
-            case SERIAL_PORT_SOFTSERIAL1:
-            case SERIAL_PORT_SOFTSERIAL2:
-                break;
-            default:
-                serialWrite(smartAudioSerialPort, 0x00); // Generate 1st start bit
-                break;
-        }
+        serialWrite(smartAudioSerialPort, 0x00); // Ensure line is low regardless of hardware pull-down capabilities.
 
         for (int i = 0 ; i < len ; i++) {
             serialWrite(smartAudioSerialPort, buf[i]);
@@ -468,6 +461,7 @@ static void saSendFrame(uint8_t *buf, int len)
         sa_outstanding = SA_CMD_NONE;
     }
 
+    serialWrite(smartAudioSerialPort, 0x00); // Pull the line low again after sending frame.
     sa_lastTransmissionMs = millis();
 }