diff --git a/signalgen.py b/signalgen.py
index db898e7..3eee25d 100755
--- a/signalgen.py
+++ b/signalgen.py
@@ -150,7 +150,7 @@ def addBurst(values):
 		src_dej=filterbankObj.your_header.dec_deg,  
 		machine_id=0,
 		nbeams=1,
-		ibeam=0,
+		ibeam=1,
 		nbits=filterbankObj.your_header.nbits,
 		nifs=1,
 		barycentric=0,