diff --git a/examples/wifi_transceiver.grc b/examples/wifi_transceiver.grc
index e6ae492..13438ed 100644
--- a/examples/wifi_transceiver.grc
+++ b/examples/wifi_transceiver.grc
@@ -1,6 +1,6 @@
 <?xml version='1.0' encoding='ASCII'?>
 <flow_graph>
-  <timestamp>Sat Feb  1 19:26:54 2014</timestamp>
+  <timestamp>Thu May  8 13:06:18 2014</timestamp>
   <block>
     <key>options</key>
     <param>
@@ -111,57 +111,6 @@
       <value>0</value>
     </param>
   </block>
-  <block>
-    <key>variable_chooser</key>
-    <param>
-      <key>id</key>
-      <value>freq</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>label</key>
-      <value>Channel</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>5.90e9</value>
-    </param>
-    <param>
-      <key>choices</key>
-      <value>[2412000000.0, 2417000000.0, 2422000000.0, 2427000000.0, 2432000000.0, 2437000000.0, 2442000000.0, 2447000000.0, 2452000000.0, 2457000000.0, 2462000000.0, 2467000000.0, 2472000000.0, 2484000000.0, 5170000000.0, 5180000000.0, 5190000000.0, 5200000000.0, 5210000000.0, 5220000000.0, 5230000000.0, 5240000000.0, 5260000000.0, 5280000000.0, 5300000000.0, 5320000000.0, 5500000000.0, 5520000000.0, 5540000000.0, 5560000000.0, 5580000000.0, 5600000000.0, 5620000000.0, 5640000000.0, 5660000000.0, 5680000000.0, 5700000000.0, 5745000000.0, 5765000000.0, 5785000000.0, 5805000000.0, 5825000000.0, 5860000000.0, 5870000000.0, 5880000000.0, 5890000000.0, 5900000000.0, 5910000000.0, 5920000000.0]</value>
-    </param>
-    <param>
-      <key>labels</key>
-      <value>['  1 | 2412.0 | 11g', '  2 | 2417.0 | 11g', '  3 | 2422.0 | 11g', '  4 | 2427.0 | 11g', '  5 | 2432.0 | 11g', '  6 | 2437.0 | 11g', '  7 | 2442.0 | 11g', '  8 | 2447.0 | 11g', '  9 | 2452.0 | 11g', ' 10 | 2457.0 | 11g', ' 11 | 2462.0 | 11g', ' 12 | 2467.0 | 11g', ' 13 | 2472.0 | 11g', ' 14 | 2484.0 | 11g', ' 34 | 5170.0 | 11a', ' 36 | 5180.0 | 11a', ' 38 | 5190.0 | 11a', ' 40 | 5200.0 | 11a', ' 42 | 5210.0 | 11a', ' 44 | 5220.0 | 11a', ' 46 | 5230.0 | 11a', ' 48 | 5240.0 | 11a', ' 52 | 5260.0 | 11a', ' 56 | 5280.0 | 11a', ' 58 | 5300.0 | 11a', ' 60 | 5320.0 | 11a', '100 | 5500.0 | 11a', '104 | 5520.0 | 11a', '108 | 5540.0 | 11a', '112 | 5560.0 | 11a', '116 | 5580.0 | 11a', '120 | 5600.0 | 11a', '124 | 5620.0 | 11a', '128 | 5640.0 | 11a', '132 | 5660.0 | 11a', '136 | 5680.0 | 11a', '140 | 5700.0 | 11a', '149 | 5745.0 | 11a', '153 | 5765.0 | 11a', '157 | 5785.0 | 11a', '161 | 5805.0 | 11a', '165 | 5825.0 | 11a', '172 | 5860.0 | 11p', '174 | 5870.0 | 11p', '176 | 5880.0 | 11p', '178 | 5890.0 | 11p', '180 | 5900.0 | 11p', '182 | 5910.0 | 11p', '184 | 5920.0 | 11p']</value>
-    </param>
-    <param>
-      <key>type</key>
-      <value>drop_down</value>
-    </param>
-    <param>
-      <key>style</key>
-      <value>wx.RA_HORIZONTAL</value>
-    </param>
-    <param>
-      <key>grid_pos</key>
-      <value></value>
-    </param>
-    <param>
-      <key>notebook</key>
-      <value></value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(755, 3)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
   <block>
     <key>variable_chooser</key>
     <param>
@@ -252,41 +201,6 @@
       <value>180</value>
     </param>
   </block>
-  <block>
-    <key>ieee802_11_ether_encap</key>
-    <param>
-      <key>id</key>
-      <value>ieee802_11_ether_encap_0</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>debug</key>
-      <value>False</value>
-    </param>
-    <param>
-      <key>affinity</key>
-      <value></value>
-    </param>
-    <param>
-      <key>minoutbuf</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>maxoutbuf</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(308, 156)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
   <block>
     <key>blocks_file_sink</key>
     <param>
@@ -651,6 +565,37 @@
       <value>0</value>
     </param>
   </block>
+  <block>
+    <key>ieee802_11_ofdm_parse_mac</key>
+    <param>
+      <key>id</key>
+      <value>ieee802_11_ofdm_parse_mac_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>log</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>debug</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(93, 296)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>180</value>
+    </param>
+  </block>
   <block>
     <key>uhd_usrp_source</key>
     <param>
@@ -1331,36 +1276,99 @@
     </param>
   </block>
   <block>
-    <key>ieee802_11_ofdm_parse_mac</key>
+    <key>blocks_multiply_const_vxx</key>
     <param>
       <key>id</key>
-      <value>ieee802_11_ofdm_parse_mac_0</value>
+      <value>blocks_multiply_const_vxx_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>log</key>
-      <value>False</value>
+      <key>type</key>
+      <value>complex</value>
     </param>
     <param>
-      <key>debug</key>
-      <value>True</value>
+      <key>const</key>
+      <value>mult</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
     </param>
     <param>
       <key>affinity</key>
       <value></value>
     </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>100000</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
     <param>
       <key>_coordinate</key>
-      <value>(93, 296)</value>
+      <value>(108, 390)</value>
     </param>
     <param>
       <key>_rotation</key>
       <value>180</value>
     </param>
   </block>
+  <block>
+    <key>variable_chooser</key>
+    <param>
+      <key>id</key>
+      <value>freq</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>Channel</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>5.89e9</value>
+    </param>
+    <param>
+      <key>choices</key>
+      <value>[2412000000.0, 2417000000.0, 2422000000.0, 2427000000.0, 2432000000.0, 2437000000.0, 2442000000.0, 2447000000.0, 2452000000.0, 2457000000.0, 2462000000.0, 2467000000.0, 2472000000.0, 2484000000.0, 5170000000.0, 5180000000.0, 5190000000.0, 5200000000.0, 5210000000.0, 5220000000.0, 5230000000.0, 5240000000.0, 5260000000.0, 5280000000.0, 5300000000.0, 5320000000.0, 5500000000.0, 5520000000.0, 5540000000.0, 5560000000.0, 5580000000.0, 5600000000.0, 5620000000.0, 5640000000.0, 5660000000.0, 5680000000.0, 5700000000.0, 5745000000.0, 5765000000.0, 5785000000.0, 5805000000.0, 5825000000.0, 5860000000.0, 5870000000.0, 5880000000.0, 5890000000.0, 5900000000.0, 5910000000.0, 5920000000.0]</value>
+    </param>
+    <param>
+      <key>labels</key>
+      <value>['  1 | 2412.0 | 11g', '  2 | 2417.0 | 11g', '  3 | 2422.0 | 11g', '  4 | 2427.0 | 11g', '  5 | 2432.0 | 11g', '  6 | 2437.0 | 11g', '  7 | 2442.0 | 11g', '  8 | 2447.0 | 11g', '  9 | 2452.0 | 11g', ' 10 | 2457.0 | 11g', ' 11 | 2462.0 | 11g', ' 12 | 2467.0 | 11g', ' 13 | 2472.0 | 11g', ' 14 | 2484.0 | 11g', ' 34 | 5170.0 | 11a', ' 36 | 5180.0 | 11a', ' 38 | 5190.0 | 11a', ' 40 | 5200.0 | 11a', ' 42 | 5210.0 | 11a', ' 44 | 5220.0 | 11a', ' 46 | 5230.0 | 11a', ' 48 | 5240.0 | 11a', ' 52 | 5260.0 | 11a', ' 56 | 5280.0 | 11a', ' 58 | 5300.0 | 11a', ' 60 | 5320.0 | 11a', '100 | 5500.0 | 11a', '104 | 5520.0 | 11a', '108 | 5540.0 | 11a', '112 | 5560.0 | 11a', '116 | 5580.0 | 11a', '120 | 5600.0 | 11a', '124 | 5620.0 | 11a', '128 | 5640.0 | 11a', '132 | 5660.0 | 11a', '136 | 5680.0 | 11a', '140 | 5700.0 | 11a', '149 | 5745.0 | 11a', '153 | 5765.0 | 11a', '157 | 5785.0 | 11a', '161 | 5805.0 | 11a', '165 | 5825.0 | 11a', '172 | 5860.0 | 11p', '174 | 5870.0 | 11p', '176 | 5880.0 | 11p', '178 | 5890.0 | 11p', '180 | 5900.0 | 11p', '182 | 5910.0 | 11p', '184 | 5920.0 | 11p']</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>drop_down</value>
+    </param>
+    <param>
+      <key>style</key>
+      <value>wx.RA_HORIZONTAL</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value></value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(755, 3)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
   <block>
     <key>uhd_usrp_sink</key>
     <param>
@@ -2019,6 +2027,10 @@
       <key>bw31</key>
       <value>0</value>
     </param>
+    <param>
+      <key>len_tag_name</key>
+      <value></value>
+    </param>
     <param>
       <key>affinity</key>
       <value></value>
@@ -2032,6 +2044,41 @@
       <value>0</value>
     </param>
   </block>
+  <block>
+    <key>ieee802_11_ether_encap</key>
+    <param>
+      <key>id</key>
+      <value>ieee802_11_ether_encap_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>debug</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(308, 156)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
   <block>
     <key>foo_packet_pad2</key>
     <param>
@@ -2056,11 +2103,11 @@
     </param>
     <param>
       <key>pad_front</key>
-      <value>10000</value>
+      <value>0</value>
     </param>
     <param>
       <key>pad_tail</key>
-      <value>0</value>
+      <value>10000</value>
     </param>
     <param>
       <key>affinity</key>
@@ -2076,56 +2123,13 @@
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(78, 479)</value>
+      <value>(78, 487)</value>
     </param>
     <param>
       <key>_rotation</key>
       <value>0</value>
     </param>
   </block>
-  <block>
-    <key>blocks_multiply_const_vxx</key>
-    <param>
-      <key>id</key>
-      <value>blocks_multiply_const_vxx_0</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>type</key>
-      <value>complex</value>
-    </param>
-    <param>
-      <key>const</key>
-      <value>mult</value>
-    </param>
-    <param>
-      <key>vlen</key>
-      <value>1</value>
-    </param>
-    <param>
-      <key>affinity</key>
-      <value></value>
-    </param>
-    <param>
-      <key>minoutbuf</key>
-      <value>100000</value>
-    </param>
-    <param>
-      <key>maxoutbuf</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(108, 389)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>180</value>
-    </param>
-  </block>
   <connection>
     <source_block_id>foo_wireshark_connector_0</source_block_id>
     <sink_block_id>blocks_file_sink_0</sink_block_id>
diff --git a/examples/wifi_tx.grc b/examples/wifi_tx.grc
index 9fef251..dd756a9 100644
--- a/examples/wifi_tx.grc
+++ b/examples/wifi_tx.grc
@@ -1,6 +1,6 @@
 <?xml version='1.0' encoding='ASCII'?>
 <flow_graph>
-  <timestamp>Sat Feb  1 19:26:11 2014</timestamp>
+  <timestamp>Thu May  8 11:23:35 2014</timestamp>
   <block>
     <key>options</key>
     <param>
@@ -192,6 +192,10 @@
       <key>mtu</key>
       <value>10000</value>
     </param>
+    <param>
+      <key>tcp_no_delay</key>
+      <value>False</value>
+    </param>
     <param>
       <key>affinity</key>
       <value></value>
@@ -252,6 +256,245 @@
       <value>0</value>
     </param>
   </block>
+  <block>
+    <key>ieee802_11_ofdm_mac</key>
+    <param>
+      <key>id</key>
+      <value>ieee802_11_ofdm_mac_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(465, 191)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_chooser</key>
+    <param>
+      <key>id</key>
+      <value>lo_offset</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>LO Offset</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>6e9</value>
+    </param>
+    <param>
+      <key>choices</key>
+      <value>[0, 6e9, 11e9]</value>
+    </param>
+    <param>
+      <key>labels</key>
+      <value>['0 MHz', '6 MHz', '11 MHz']</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>drop_down</value>
+    </param>
+    <param>
+      <key>style</key>
+      <value>wx.RA_HORIZONTAL</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value></value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(697, 165)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_chooser</key>
+    <param>
+      <key>id</key>
+      <value>freq</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>Channel</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>5.89e9</value>
+    </param>
+    <param>
+      <key>choices</key>
+      <value>[2412000000.0, 2417000000.0, 2422000000.0, 2427000000.0, 2432000000.0, 2437000000.0, 2442000000.0, 2447000000.0, 2452000000.0, 2457000000.0, 2462000000.0, 2467000000.0, 2472000000.0, 2484000000.0, 5170000000.0, 5180000000.0, 5190000000.0, 5200000000.0, 5210000000.0, 5220000000.0, 5230000000.0, 5240000000.0, 5260000000.0, 5280000000.0, 5300000000.0, 5320000000.0, 5500000000.0, 5520000000.0, 5540000000.0, 5560000000.0, 5580000000.0, 5600000000.0, 5620000000.0, 5640000000.0, 5660000000.0, 5680000000.0, 5700000000.0, 5745000000.0, 5765000000.0, 5785000000.0, 5805000000.0, 5825000000.0, 5860000000.0, 5870000000.0, 5880000000.0, 5890000000.0, 5900000000.0, 5910000000.0, 5920000000.0]</value>
+    </param>
+    <param>
+      <key>labels</key>
+      <value>['  1 | 2412.0 | 11g', '  2 | 2417.0 | 11g', '  3 | 2422.0 | 11g', '  4 | 2427.0 | 11g', '  5 | 2432.0 | 11g', '  6 | 2437.0 | 11g', '  7 | 2442.0 | 11g', '  8 | 2447.0 | 11g', '  9 | 2452.0 | 11g', ' 10 | 2457.0 | 11g', ' 11 | 2462.0 | 11g', ' 12 | 2467.0 | 11g', ' 13 | 2472.0 | 11g', ' 14 | 2484.0 | 11g', ' 34 | 5170.0 | 11a', ' 36 | 5180.0 | 11a', ' 38 | 5190.0 | 11a', ' 40 | 5200.0 | 11a', ' 42 | 5210.0 | 11a', ' 44 | 5220.0 | 11a', ' 46 | 5230.0 | 11a', ' 48 | 5240.0 | 11a', ' 52 | 5260.0 | 11a', ' 56 | 5280.0 | 11a', ' 58 | 5300.0 | 11a', ' 60 | 5320.0 | 11a', '100 | 5500.0 | 11a', '104 | 5520.0 | 11a', '108 | 5540.0 | 11a', '112 | 5560.0 | 11a', '116 | 5580.0 | 11a', '120 | 5600.0 | 11a', '124 | 5620.0 | 11a', '128 | 5640.0 | 11a', '132 | 5660.0 | 11a', '136 | 5680.0 | 11a', '140 | 5700.0 | 11a', '149 | 5745.0 | 11a', '153 | 5765.0 | 11a', '157 | 5785.0 | 11a', '161 | 5805.0 | 11a', '165 | 5825.0 | 11a', '172 | 5860.0 | 11p', '174 | 5870.0 | 11p', '176 | 5880.0 | 11p', '178 | 5890.0 | 11p', '180 | 5900.0 | 11p', '182 | 5910.0 | 11p', '184 | 5920.0 | 11p']</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>drop_down</value>
+    </param>
+    <param>
+      <key>style</key>
+      <value>wx.RA_HORIZONTAL</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value></value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(419, 11)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_slider</key>
+    <param>
+      <key>id</key>
+      <value>mult</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value></value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>.38</value>
+    </param>
+    <param>
+      <key>min</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>max</key>
+      <value>2</value>
+    </param>
+    <param>
+      <key>num_steps</key>
+      <value>100</value>
+    </param>
+    <param>
+      <key>style</key>
+      <value>wx.SL_HORIZONTAL</value>
+    </param>
+    <param>
+      <key>converver</key>
+      <value>float_converter</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value></value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(979, 10)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_chooser</key>
+    <param>
+      <key>id</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>Sample Rate</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>10e6</value>
+    </param>
+    <param>
+      <key>choices</key>
+      <value>[10e6, 20e6]</value>
+    </param>
+    <param>
+      <key>labels</key>
+      <value>["10 Mhz", "20 Mhz"]</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>radio_buttons</value>
+    </param>
+    <param>
+      <key>style</key>
+      <value>wx.RA_HORIZONTAL</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value></value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(629, 14)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
   <block>
     <key>uhd_usrp_sink</key>
     <param>
@@ -910,13 +1153,17 @@
       <key>bw31</key>
       <value>0</value>
     </param>
+    <param>
+      <key>len_tag_name</key>
+      <value></value>
+    </param>
     <param>
       <key>affinity</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(279, 428)</value>
+      <value>(274, 420)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -924,22 +1171,34 @@
     </param>
   </block>
   <block>
-    <key>blocks_null_source</key>
+    <key>foo_packet_pad2</key>
     <param>
       <key>id</key>
-      <value>blocks_null_source_0</value>
+      <value>foo_packet_pad2_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
+      <key>debug</key>
+      <value>False</value>
     </param>
     <param>
-      <key>vlen</key>
-      <value>1</value>
+      <key>delay</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>delay_sec</key>
+      <value>0.01</value>
+    </param>
+    <param>
+      <key>pad_front</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>pad_tail</key>
+      <value>10000</value>
     </param>
     <param>
       <key>affinity</key>
@@ -947,7 +1206,7 @@
     </param>
     <param>
       <key>minoutbuf</key>
-      <value>0</value>
+      <value>100000</value>
     </param>
     <param>
       <key>maxoutbuf</key>
@@ -955,289 +1214,7 @@
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(678, 333)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>180</value>
-    </param>
-  </block>
-  <block>
-    <key>blocks_multiply_const_vxx</key>
-    <param>
-      <key>id</key>
-      <value>blocks_multiply_const_vxx_0</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>type</key>
-      <value>complex</value>
-    </param>
-    <param>
-      <key>const</key>
-      <value>mult</value>
-    </param>
-    <param>
-      <key>vlen</key>
-      <value>1</value>
-    </param>
-    <param>
-      <key>affinity</key>
-      <value></value>
-    </param>
-    <param>
-      <key>minoutbuf</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>maxoutbuf</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(232, 329)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>180</value>
-    </param>
-  </block>
-  <block>
-    <key>ieee802_11_ofdm_mac</key>
-    <param>
-      <key>id</key>
-      <value>ieee802_11_ofdm_mac_0</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>affinity</key>
-      <value></value>
-    </param>
-    <param>
-      <key>minoutbuf</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>maxoutbuf</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(465, 191)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>variable_chooser</key>
-    <param>
-      <key>id</key>
-      <value>lo_offset</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>label</key>
-      <value>LO Offset</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>6e9</value>
-    </param>
-    <param>
-      <key>choices</key>
-      <value>[0, 6e9, 11e9]</value>
-    </param>
-    <param>
-      <key>labels</key>
-      <value>['0 MHz', '6 MHz', '11 MHz']</value>
-    </param>
-    <param>
-      <key>type</key>
-      <value>drop_down</value>
-    </param>
-    <param>
-      <key>style</key>
-      <value>wx.RA_HORIZONTAL</value>
-    </param>
-    <param>
-      <key>grid_pos</key>
-      <value></value>
-    </param>
-    <param>
-      <key>notebook</key>
-      <value></value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(697, 165)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>variable_chooser</key>
-    <param>
-      <key>id</key>
-      <value>freq</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>label</key>
-      <value>Channel</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>5.89e9</value>
-    </param>
-    <param>
-      <key>choices</key>
-      <value>[2412000000.0, 2417000000.0, 2422000000.0, 2427000000.0, 2432000000.0, 2437000000.0, 2442000000.0, 2447000000.0, 2452000000.0, 2457000000.0, 2462000000.0, 2467000000.0, 2472000000.0, 2484000000.0, 5170000000.0, 5180000000.0, 5190000000.0, 5200000000.0, 5210000000.0, 5220000000.0, 5230000000.0, 5240000000.0, 5260000000.0, 5280000000.0, 5300000000.0, 5320000000.0, 5500000000.0, 5520000000.0, 5540000000.0, 5560000000.0, 5580000000.0, 5600000000.0, 5620000000.0, 5640000000.0, 5660000000.0, 5680000000.0, 5700000000.0, 5745000000.0, 5765000000.0, 5785000000.0, 5805000000.0, 5825000000.0, 5860000000.0, 5870000000.0, 5880000000.0, 5890000000.0, 5900000000.0, 5910000000.0, 5920000000.0]</value>
-    </param>
-    <param>
-      <key>labels</key>
-      <value>['  1 | 2412.0 | 11g', '  2 | 2417.0 | 11g', '  3 | 2422.0 | 11g', '  4 | 2427.0 | 11g', '  5 | 2432.0 | 11g', '  6 | 2437.0 | 11g', '  7 | 2442.0 | 11g', '  8 | 2447.0 | 11g', '  9 | 2452.0 | 11g', ' 10 | 2457.0 | 11g', ' 11 | 2462.0 | 11g', ' 12 | 2467.0 | 11g', ' 13 | 2472.0 | 11g', ' 14 | 2484.0 | 11g', ' 34 | 5170.0 | 11a', ' 36 | 5180.0 | 11a', ' 38 | 5190.0 | 11a', ' 40 | 5200.0 | 11a', ' 42 | 5210.0 | 11a', ' 44 | 5220.0 | 11a', ' 46 | 5230.0 | 11a', ' 48 | 5240.0 | 11a', ' 52 | 5260.0 | 11a', ' 56 | 5280.0 | 11a', ' 58 | 5300.0 | 11a', ' 60 | 5320.0 | 11a', '100 | 5500.0 | 11a', '104 | 5520.0 | 11a', '108 | 5540.0 | 11a', '112 | 5560.0 | 11a', '116 | 5580.0 | 11a', '120 | 5600.0 | 11a', '124 | 5620.0 | 11a', '128 | 5640.0 | 11a', '132 | 5660.0 | 11a', '136 | 5680.0 | 11a', '140 | 5700.0 | 11a', '149 | 5745.0 | 11a', '153 | 5765.0 | 11a', '157 | 5785.0 | 11a', '161 | 5805.0 | 11a', '165 | 5825.0 | 11a', '172 | 5860.0 | 11p', '174 | 5870.0 | 11p', '176 | 5880.0 | 11p', '178 | 5890.0 | 11p', '180 | 5900.0 | 11p', '182 | 5910.0 | 11p', '184 | 5920.0 | 11p']</value>
-    </param>
-    <param>
-      <key>type</key>
-      <value>drop_down</value>
-    </param>
-    <param>
-      <key>style</key>
-      <value>wx.RA_HORIZONTAL</value>
-    </param>
-    <param>
-      <key>grid_pos</key>
-      <value></value>
-    </param>
-    <param>
-      <key>notebook</key>
-      <value></value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(419, 11)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>variable_slider</key>
-    <param>
-      <key>id</key>
-      <value>mult</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>label</key>
-      <value></value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>.38</value>
-    </param>
-    <param>
-      <key>min</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>max</key>
-      <value>2</value>
-    </param>
-    <param>
-      <key>num_steps</key>
-      <value>100</value>
-    </param>
-    <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
-    </param>
-    <param>
-      <key>converver</key>
-      <value>float_converter</value>
-    </param>
-    <param>
-      <key>grid_pos</key>
-      <value></value>
-    </param>
-    <param>
-      <key>notebook</key>
-      <value></value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(979, 10)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>variable_chooser</key>
-    <param>
-      <key>id</key>
-      <value>samp_rate</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>label</key>
-      <value>Sample Rate</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>10e6</value>
-    </param>
-    <param>
-      <key>choices</key>
-      <value>[10e6, 20e6]</value>
-    </param>
-    <param>
-      <key>labels</key>
-      <value>["10 Mhz", "20 Mhz"]</value>
-    </param>
-    <param>
-      <key>type</key>
-      <value>radio_buttons</value>
-    </param>
-    <param>
-      <key>style</key>
-      <value>wx.RA_HORIZONTAL</value>
-    </param>
-    <param>
-      <key>grid_pos</key>
-      <value></value>
-    </param>
-    <param>
-      <key>notebook</key>
-      <value></value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(629, 14)</value>
+      <value>(85, 420)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1280,34 +1257,30 @@
     </param>
   </block>
   <block>
-    <key>foo_packet_pad2</key>
+    <key>blocks_null_source</key>
     <param>
       <key>id</key>
-      <value>foo_packet_pad2_0</value>
+      <value>blocks_null_source_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>debug</key>
-      <value>False</value>
+      <key>type</key>
+      <value>complex</value>
     </param>
     <param>
-      <key>delay</key>
-      <value>True</value>
+      <key>vlen</key>
+      <value>1</value>
     </param>
     <param>
-      <key>delay_sec</key>
-      <value>0.001</value>
+      <key>num_outputs</key>
+      <value>1</value>
     </param>
     <param>
-      <key>pad_front</key>
-      <value>10000</value>
-    </param>
-    <param>
-      <key>pad_tail</key>
-      <value>0</value>
+      <key>bus_conns</key>
+      <value>[[0,],]</value>
     </param>
     <param>
       <key>affinity</key>
@@ -1315,7 +1288,7 @@
     </param>
     <param>
       <key>minoutbuf</key>
-      <value>100000</value>
+      <value>0</value>
     </param>
     <param>
       <key>maxoutbuf</key>
@@ -1323,12 +1296,55 @@
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(86, 420)</value>
+      <value>(668, 333)</value>
     </param>
     <param>
       <key>_rotation</key>
+      <value>180</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_multiply_const_vxx</key>
+    <param>
+      <key>id</key>
+      <value>blocks_multiply_const_vxx_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>const</key>
+      <value>mult</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
       <value>0</value>
     </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(231, 329)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>180</value>
+    </param>
   </block>
   <connection>
     <source_block_id>blocks_message_strobe_0</source_block_id>
@@ -1354,12 +1370,6 @@
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
-  <connection>
-    <source_block_id>blocks_null_source_0</source_block_id>
-    <sink_block_id>wifi_phy_hier_0</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
   <connection>
     <source_block_id>blocks_multiply_const_vxx_0</source_block_id>
     <sink_block_id>foo_packet_pad2_0</sink_block_id>
@@ -1378,4 +1388,10 @@
     <source_key>mac_out</source_key>
     <sink_key>phy in</sink_key>
   </connection>
+  <connection>
+    <source_block_id>blocks_null_source_0</source_block_id>
+    <sink_block_id>wifi_phy_hier_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
 </flow_graph>