diff --git a/tb/pmd.py b/tb/pmd.py
index eb421ff..52f7cd1 100644
--- a/tb/pmd.py
+++ b/tb/pmd.py
@@ -66,7 +66,7 @@ async def test_rx(pmd, delays):
 
     best_corr = -1
     best_off = None
-    for off in range(-7, 8):
+    for off in range(16):
         corr = sum(i == o for i, o in zip(ins[off:], outs))
         if corr > best_corr:
             best_corr = corr