diff --git a/lib/olt_lib/ir_tx/olt.py b/lib/olt_lib/ir_tx/olt.py
index b243f89..46c38a3 100644
--- a/lib/olt_lib/ir_tx/olt.py
+++ b/lib/olt_lib/ir_tx/olt.py
@@ -25,7 +25,6 @@ class LT_ABC(IR):
 
 
     def tx(self, tx1, tx2, tx3):
-        self.append(2400, 600)
         bits = self.bits
         v = tx3 & 0xff
         v |= (tx2 & 0xff) << 8
@@ -34,6 +33,7 @@ class LT_ABC(IR):
         v = rbit32(v)
         v = v >> 8
 
+        self.append(2400, 600)
         for _ in range(bits):
             self.append(1200 if v & 1 else 600, 600)
             v >>= 1