Index: ammosreader/AmmosIFDataBlock.py
===================================================================
--- ammosreader/AmmosIFDataBlock.py	(revision 83e6c897ce837fddd9c7b99bb1dabb0e09f06303)
+++ ammosreader/AmmosIFDataBlock.py	(revision 83e6c897ce837fddd9c7b99bb1dabb0e09f06303)
@@ -0,0 +1,13 @@
+class AmmosIFDataBlock:
+
+    def __init__(self, header, data):
+        self.__header = header
+        self.__data = data
+
+    @property
+    def header(self):
+        return self.__header
+
+    @property
+    def data(self):
+        return self.__data
Index: ammosreader/AmmosIFDataBlockHeader.py
===================================================================
--- ammosreader/AmmosIFDataBlockHeader.py	(revision 83e6c897ce837fddd9c7b99bb1dabb0e09f06303)
+++ ammosreader/AmmosIFDataBlockHeader.py	(revision 83e6c897ce837fddd9c7b99bb1dabb0e09f06303)
@@ -0,0 +1,69 @@
+import struct
+
+class AmmosIFDataBlockHeader:
+    """I implement an AMMOS IF data block header."""
+
+    HEADER_SIZE = 4
+
+    @classmethod
+    def from_bytes(cls, bytes):
+        """I return an AMMOS IF data block header built from bytes."""
+        assert len(bytes) == cls.HEADER_SIZE
+        elements = struct.unpack('<ccH', bytes)
+        header = cls(bytes)
+        header.invalidity = ((elements[0] & 1) == 1)
+        header.blanking = ((elements[0] & 2) == 1)
+        header.user_data = ((elements[0] & 252))
+        header.reserved = elements[1]
+        header.reciprocal_gain = elements[2]
+        return header
+
+    def __init__(self):
+        """I return an AMMOS IF data block header initialized with sane default values."""
+        self.__invalidity = True
+        self.__blanking = False
+        self.__user_data = 0
+        self.__reserved = 0
+        self.__reciprocal_gain = 0
+
+    @property
+    def invalidity(self):
+        return self.__invalidity
+
+    @invalidity.setter
+    def invalidity(self, a_boolean):
+        self.__invalidity = a_boolean
+
+    @property
+    def blanking(self):
+        return self.__blanking
+
+    @blanking.setter
+    def blanking(self, a_boolean):
+        self.__blanking = a_boolean
+
+    @property
+    def user_data(self):
+        return self.__user_data
+
+    @user_data.setter
+    def user_data(self, some_data):
+        self.__user_data = some_data
+
+    @property
+    def reserved(self):
+        return self.__reserved
+
+    @reserved.setter
+    def reserved(self, some_data):
+        assert some_data == 0
+        self.__reserved = some_data
+
+    @property
+    def reciprocal_gain(self):
+        return self.__reciprocal_gain
+
+    @reciprocal_gain.setter
+    def reciprocal_setter(self, a_gain_value):
+        assert 0 <= a_gain_value < pow(2, 16)
+        self.__reciprocal_gain = a_gain_value
Index: ammosreader/AmmosIFDataBody.py
===================================================================
--- ammosreader/AmmosIFDataBody.py	(revision 83e6c897ce837fddd9c7b99bb1dabb0e09f06303)
+++ ammosreader/AmmosIFDataBody.py	(revision 83e6c897ce837fddd9c7b99bb1dabb0e09f06303)
@@ -0,0 +1,21 @@
+"""
+I provide an AMMOS data body for IF data.
+
+I manage multiple IF data blocks
+"""
+
+class AmmosIFDataBody:
+    """I implement an AMMOS data body for IF data."""
+    def __init__(self, data_blocks):
+        self.__data_blocks = data_blocks
+
+    @property
+    def data_blocks(self):
+        return self.__data_blocks
+
+    def add_data_block(self, a_data_block):
+        self.__data_blocks.append(a_data_block)
+
+    @property
+    def data(self):
+        b"".join([each.data for each in self.data_blocks])