diff --git a/recv.py b/recv.py
index 5359ade..cc8f27f 100755
--- a/recv.py
+++ b/recv.py
@@ -3,6 +3,7 @@ import numpy as np
 import logging
 import itertools
 import time
+import sys
 import os
 
 log = logging.getLogger(__name__)
@@ -194,8 +195,7 @@ def main(fname):
             return
 
         log.info('Decoded %.3f kB', len(data) / 1e3)
-        with file('data.recv', 'wb') as f:
-            f.write(data)
+        sys.stdout.write(data)
 
 if __name__ == '__main__':
     logging.basicConfig(level=logging.INFO,
diff --git a/send.py b/send.py
index 3398b09..fb30a4f 100755
--- a/send.py
+++ b/send.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 import numpy as np
-
+import sys
 import logging
 import itertools
 
@@ -17,8 +17,7 @@ class Symbol(object):
     carrier = [np.exp(2j * np.pi * F * t) for F in frequencies]
 
 sym = Symbol()
-
-data = open('data.send', 'r').read()
+data = sys.stdin.read()
 
 
 def write(fd, sym, n=1):
diff --git a/test.sh b/test.sh
index f9de37d..93c82b4 100755
--- a/test.sh
+++ b/test.sh
@@ -3,7 +3,7 @@ set -u
 set -e 
 
 dd if=/dev/urandom of=data.send bs=1024 count=16 status=none
-./send.py tx.int16
+./send.py tx.int16 < data.send
 
 killall arecord aplay || true
 
@@ -13,7 +13,7 @@ sleep 1
 
 killall arecord aplay || true
 
-./recv.py rx.int16
+./recv.py rx.int16 > data.recv
 ./errors.py data.* 
 if [ -z $? ]; then
 	./show.py tx.int16 rx.int16