diff --git a/schainpy/IO/DataIO.py b/schainpy/IO/DataIO.py
index ac96491..330bdc5 100644
--- a/schainpy/IO/DataIO.py
+++ b/schainpy/IO/DataIO.py
@@ -213,6 +213,8 @@ class JRODataReader(DataReader):
     
     heightList = None
     
+    channelList = None
+    
     online = 0
     
     fp = None
@@ -263,7 +265,6 @@ class JRODataReader(DataReader):
 
     datablockIndex = 9999
     
-    
     #speed of light
     c = 3E8
     
@@ -1003,14 +1004,8 @@ class JRODataWriter(DataWriter):
         
     filename = None
         
-    m_BasicHeader = None
-    
-    m_SystemHeader = None
+    channelList = None
     
-    m_RadarControllerHeader = None
-    
-    m_ProcessingHeader = None
-
     
     def __init__(self, m_DataObj=None):
         raise ValueError, "Not implemented"