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diff --git a/gr-usrp2/grc/usrp2_source_xxxx.xml b/gr-usrp2/grc/usrp2_source_xxxx.xml
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+++ b/gr-usrp2/grc/usrp2_source_xxxx.xml
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+<?xml version="1.0"?>
+<!--
+###################################################
+##USRP2 Source
+##  Note: the center freq must be set after the lo offset
+###################################################
+ -->
+<block>
+	<name>USRP2 Source</name>
+	<key>usrp2_source_xxxx</key>
+	<category>USRP</category>
+	<import>from gnuradio import usrp2</import>
+	<make>#if not $interface() and not $mac_addr()
+usrp2.source_$(type.fcn)()
+#elif not $mac_addr()
+usrp2.source_$(type.fcn)($interface)
+#else
+usrp2.source_$(type.fcn)($interface, $mac_addr)
+#end if
+self.$(id).set_decim($decimation)
+#if $lo_offset() != float('inf')
+self.$(id).set_lo_offset($lo_offset)
+#end if
+self.$(id).set_center_freq($frequency)
+self.$(id).set_gain($gain)
+self.$(id).config_mimo($usrp2_clock_src)</make>
+	<callback>set_decim($decimation)</callback>
+	<callback>#if $lo_offset() != float('inf')
+self.$(id).set_lo_offset($lo_offset)
+#end if
+self.$(id).set_center_freq($frequency)</callback>
+	<callback>set_gain($gain)</callback>
+	<param>
+		<name>Output Type</name>
+		<key>type</key>
+		<type>enum</type>
+		<option>
+			<name>Complex</name>
+			<key>complex</key>
+			<opt>fcn:32fc</opt>
+			<opt>vlen:1</opt>
+		</option>
+		<option>
+			<name>Short</name>
+			<key>short</key>
+			<opt>fcn:16sc</opt>
+			<opt>vlen:2</opt>
+		</option>
+	</param>
+	<param>
+		<name>Interface</name>
+		<key>interface</key>
+		<value></value>
+		<type>string</type>
+	</param>
+	<param>
+		<name>MAC Addr</name>
+		<key>mac_addr</key>
+		<value></value>
+		<type>string</type>
+	</param>
+	<param>
+		<name>Decimation</name>
+		<key>decimation</key>
+		<type>int</type>
+	</param>
+	<param>
+		<name>Frequency (Hz)</name>
+		<key>frequency</key>
+		<type>real</type>
+	</param>
+	<param>
+		<name>LO Offset (Hz)</name>
+		<key>lo_offset</key>
+		<value>float('inf')</value>
+		<type>real</type>
+		<hide>#if $lo_offset() == float('inf') then 'part' else 'none'#</hide>
+		<option>
+			<name>Default</name>
+			<key>float('inf')</key>
+		</option>
+	</param>
+	<param>
+		<name>Gain (dB)</name>
+		<key>gain</key>
+		<value>0</value>
+		<type>real</type>
+	</param>
+	<param>
+		<name>Clock Source</name>
+		<key>usrp2_clock_src</key>
+		<value>usrp2.MC_WE_DONT_LOCK</value>
+		<type>enum</type>
+		<option>
+			<name>Internal</name>
+			<key>usrp2.MC_WE_DONT_LOCK</key>
+		</option>
+		<option>
+			<name>External SMA</name>
+			<key>usrp2.MC_WE_LOCK_TO_SMA</key>
+		</option>
+		<option>
+			<name>External MIMO</name>
+			<key>usrp2.MC_WE_LOCK_TO_MIMO</key>
+		</option>
+	</param>
+	<source>
+		<name>out</name>
+		<type>$type</type>
+		<vlen>$type.vlen</vlen>
+	</source>
+	<doc>
+The USRP2 source outputs 100 Megasamples per second / decimation.
+
+To use the default ethernet device, leave interface blank. \
+For systems with only 1 USRP2, you may leave the mac address blank. \
+For multi-USRP2 systems, specify the mac address in the form 00:50:C2:85:3x:xx.
+	</doc>
+</block>