diff --git a/schainpy/model/jrodataIO.py b/schainpy/model/jrodataIO.py
index f64ce64..ff8bba5 100644
--- a/schainpy/model/jrodataIO.py
+++ b/schainpy/model/jrodataIO.py
@@ -1387,7 +1387,7 @@ class VoltageReader(JRODataReader):
             if not( self.readNextBlock() ):
                 return 0
         
-            self.dataOut.dtype = numpy.dtype([('real','<f8'),('imag','<f8')]) #self.dtype
+            self.dataOut.dtype = self.dtype
             
             self.dataOut.nProfiles = self.processingHeaderObj.profilesPerBlock
             
@@ -1527,7 +1527,7 @@ class VoltageWriter(JRODataWriter):
         self.datablock = numpy.zeros((self.systemHeaderObj.nChannels,
                                      self.processingHeaderObj.profilesPerBlock,
                                      self.processingHeaderObj.nHeights),
-                                     dtype=numpy.dtype('complex'))
+                                     dtype=numpy.dtype('complex64'))
 
         
     def writeBlock(self):
@@ -2045,7 +2045,7 @@ class SpectraReader(JRODataReader):
     
         self.dataOut.flagNoData = False
 
-        self.dataOut.dtype = numpy.dtype([('real','<f8'),('imag','<f8')])#self.dtype
+        self.dataOut.dtype = self.dtype
 
 #        self.dataOut.nChannels = self.nRdChannels
         
@@ -2225,6 +2225,7 @@ class SpectraWriter(JRODataWriter):
         if not( self.processingHeaderObj.shif_fft ):
             spc = numpy.roll( spc, self.processingHeaderObj.profilesPerBlock/2, axis=2 ) #desplaza a la derecha en el eje 2 determinadas posiciones
         data = spc.reshape((-1))
+        data = data.astype(self.dtype[0])
         data.tofile(self.fp)
 
         if self.data_cspc != None:
diff --git a/schainpy/model/jroprocessing.py b/schainpy/model/jroprocessing.py
index 8d4f03a..5624b62 100644
--- a/schainpy/model/jroprocessing.py
+++ b/schainpy/model/jroprocessing.py
@@ -680,7 +680,7 @@ class SpectraProc(ProcessingUnit):
         self.dataOut.systemHeaderObj = self.dataIn.systemHeaderObj.copy()
         self.dataOut.channelList = self.dataIn.channelList
         self.dataOut.heightList = self.dataIn.heightList
-        self.dataOut.dtype = self.dataIn.dtype
+        self.dataOut.dtype = numpy.dtype([('real','<f4'),('imag','<f4')])
 #        self.dataOut.nHeights = self.dataIn.nHeights
 #        self.dataOut.nChannels = self.dataIn.nChannels
         self.dataOut.nBaud = self.dataIn.nBaud
@@ -714,6 +714,7 @@ class SpectraProc(ProcessingUnit):
             self.dataOut.flagNoData
         """
         fft_volt = numpy.fft.fft(self.buffer,axis=1)
+        fft_volt = fft_volt.astype(numpy.dtype('complex'))
         dc = fft_volt[:,0,:]
         
         #calculo de self-spectra