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diff --git a/grc/grc_gnuradio/usrp/common.py b/grc/grc_gnuradio/usrp/common.py
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+++ b/grc/grc_gnuradio/usrp/common.py
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+# Copyright 2009 Free Software Foundation, Inc.
+#
+# This file is part of GNU Radio
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+import sys
+from gnuradio import usrp, gr
+
+##################################################
+# USRP base class with common methods
+##################################################
+class usrp_helper(object):
+	def _make_usrp(self, *args, **kwargs): self._u = self._usrp_args[0](*args, **kwargs)
+	def _get_u(self): return self._u
+	def _get_io_size(self): return self._usrp_args[1]
+	def _set_frequency(self, chan, subdev, frequency, verbose=False):
+		"""
+		Set the carrier frequency for the given subdevice.
+		@param chan specifies the DDC/DUC number
+		@param frequency the carrier frequency in Hz
+		@param verbose if true, print usrp tuning information
+		"""
+		r = self._get_u().tune(chan, subdev, frequency)
+		if not verbose: return
+		print subdev.side_and_name()
+		if r:
+			print "\tr.baseband_frequency =", r.baseband_freq
+			print "\tr.dxc_frequency =", r.dxc_freq
+			print "\tr.residual_frequency =", r.residual_freq
+			print "\tr.inverted =", r.inverted, "\n"
+		else: print >> sys.stderr, 'Error calling tune on subdevice.'
+	def set_format(self, width, shift): self._get_u().set_format(self._get_u().make_format(width, shift))
+
+##################################################
+# Classes to associate usrp constructor w/ io size
+##################################################
+class usrp_source_c(usrp_helper): _usrp_args = (usrp.source_c, gr.sizeof_gr_complex)
+class usrp_source_s(usrp_helper): _usrp_args = (usrp.source_s, gr.sizeof_short)
+class usrp_sink_c(usrp_helper): _usrp_args = (usrp.sink_c, gr.sizeof_gr_complex)
+class usrp_sink_s(usrp_helper): _usrp_args = (usrp.sink_s, gr.sizeof_short)
+
+##################################################
+# Side spec and antenna spec functions
+##################################################
+def is_flex(rx_ant): return rx_ant.upper() in ('TX/RX', 'RX2')
+def to_spec(side, rx_ant='RXA'):
+	"""
+	Convert the side to a spec number.
+	@param side A or B
+	@param rx_ant antenna type
+	@return the spec (0/1, 0/1/2)
+	"""
+	#determine the side spec
+	try: side_spec = {'A': 0, 'B': 1}[side.upper()]
+	except: raise ValueError, 'Side A or B expected.'
+	#determine the subdevice spec
+	if rx_ant.upper() == 'RXB': subdev_spec = 1
+	elif rx_ant.upper() == 'RXAB': subdev_spec = 2
+	else: subdev_spec = 0
+	return (side_spec, subdev_spec)