diff --git a/tx/utils.py b/tx/utils.py
new file mode 100644
index 0000000..10aff36
--- /dev/null
+++ b/tx/utils.py
@@ -0,0 +1,26 @@
+import numpy as np
+class BinaryDebug(object):
+    """ Debug binary 'transmitter' Class
+    Used to write packet data to a file in one-bit-per-char (i.e. 0 = 0x00, 1 = 0x01)
+    format for use with codec2-dev's fsk modulator.
+    Useful for debugging, that's about it.
+    """
+    def __init__(self, rs232=True, f=None):
+        if f:
+            self.f = f
+        else:
+            self.f = open("debug.bin",'wb')
+        self.rs232 = rs232 # RS232 framing
+
+    def write(self,data):
+        raw_data = np.array([],dtype=np.uint8)
+        for d in data:
+            d_array = np.unpackbits(np.frombuffer(d.to_bytes(1),dtype=np.uint8))
+            if self.rs232:
+                raw_data = np.concatenate((raw_data,[0],d_array[::-1],[1]))
+            else:
+                raw_data = np.concatenate((raw_data,d_array))
+
+        self.f.write(raw_data.astype(np.uint8).tostring())
+    def close(self):
+        self.f.close()
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