diff --git a/schainpy/model/io/jroIO_base.py b/schainpy/model/io/jroIO_base.py
index ac89eec..e31f158 100644
--- a/schainpy/model/io/jroIO_base.py
+++ b/schainpy/model/io/jroIO_base.py
@@ -569,6 +569,13 @@ class JRODataReader(JRODataIO):
     
     txIndex = None
     
+    #Added--------------------
+    
+    selBlocksize = None
+    
+    selBlocktime = None
+    
+    
     def __init__(self):
         
         """
@@ -1237,7 +1244,9 @@ class JRODataReader(JRODataIO):
                 walk = True,
                 getblock = False,
                 nTxs = 1,
-                realtime=False):
+                realtime=False,
+                blocksize=None,
+                blocktime=None):
 
         if path == None:
             raise ValueError, "[Reading] The path is not valid"
@@ -1304,6 +1313,11 @@ class JRODataReader(JRODataIO):
         self.startTime = startTime
         self.endTime = endTime
         
+        #Added-----------------
+        self.selBlocksize = blocksize
+        self.selBlocktime = blocktime
+        
+        
         if not(self.setNextFile()):
             if (startDate!=None) and (endDate!=None):
                 print "[Reading] No files in range: %s - %s" %(datetime.datetime.combine(startDate,startTime).ctime(), datetime.datetime.combine(endDate,endTime).ctime())
@@ -1339,7 +1353,7 @@ class JRODataReader(JRODataIO):
         
         self.dataOut.ippSeconds = self.radarControllerHeaderObj.ippSeconds/self.nTxs
         
-        self.dataOut.nProfiles = self.processingHeaderObj.profilesPerBlock*self.nTxs
+#         self.dataOut.nProfiles = self.processingHeaderObj.profilesPerBlock*self.nTxs
         
         
     def getFirstHeader(self):
diff --git a/schainpy/model/io/jroIO_voltage.py b/schainpy/model/io/jroIO_voltage.py
index 05b6e8d..33dd825 100644
--- a/schainpy/model/io/jroIO_voltage.py
+++ b/schainpy/model/io/jroIO_voltage.py
@@ -57,7 +57,6 @@ class VoltageReader(JRODataReader, ProcessingUnit):
     optchar = "D"
     dataOut = None
     
-    
     def __init__(self):
         """
         Inicializador de la clase VoltageReader para la lectura de datos de voltage.
@@ -373,15 +372,41 @@ class VoltageReader(JRODataReader, ProcessingUnit):
             
             self.profileIndex += 1
                 
+#         elif self.selBlocksize==None or self.selBlocksize==self.dataOut.nProfiles:
+#             """
+#             Return all block
+#             """
+#             self.dataOut.flagDataAsBlock = True
+#             self.dataOut.data = self.datablock
+#             self.dataOut.profileIndex = self.dataOut.nProfiles - 1
+#             
+#             self.profileIndex = self.dataOut.nProfiles
+        
         else:
             """
-            Return all block
+            Return a block
             """
-            self.dataOut.flagDataAsBlock = True
-            self.dataOut.data = self.datablock
-            self.dataOut.profileIndex = self.dataOut.nProfiles - 1
+            if self.selBlocksize == None:   self.selBlocksize = self.dataOut.nProfiles
+            if self.selBlocktime != None:   self.selBlocksize = int(self.dataOut.nProfiles*round(self.selBlocktime/(self.dataOut.ippSeconds*self.dataOut.nProfiles)))
             
-            self.profileIndex = self.dataOut.nProfiles
+            self.dataOut.data = self.datablock[:,self.profileIndex:self.profileIndex+self.selBlocksize,:]
+            self.profileIndex += self.selBlocksize
+                    
+            while self.dataOut.data.shape[1] < self.selBlocksize: #Not enough profiles to fill the block
+                if not( self.readNextBlock() ):
+                    return 0    
+                self.getFirstHeader()
+                self.reshapeData()
+                if self.datablock is None:
+                    self.dataOut.flagNoData = True
+                    return 0
+                #stack data
+                indMax = self.selBlocksize - self.dataOut.data.shape[1] 
+                self.dataOut.data = numpy.hstack((self.dataOut.data,self.datablock[:,:indMax,:]))
+                self.profileIndex = indMax
+ 
+            self.dataOut.flagDataAsBlock = True
+            self.dataOut.nProfiles = self.selBlocksize
         
         self.dataOut.flagNoData = False