diff --git a/examples/wifi_tx.grc b/examples/wifi_tx.grc
index 56aa15d..d554b58 100644
--- a/examples/wifi_tx.grc
+++ b/examples/wifi_tx.grc
@@ -1,7 +1,6 @@
 <?xml version='1.0' encoding='ASCII'?>
-<?grc format='1' created='3.8.git'?>
 <flow_graph>
-  <timestamp>Fri Jul 18 10:38:21 2014</timestamp>
+  <timestamp>Fri Apr 17 13:08:32 2015</timestamp>
   <block>
     <key>options</key>
     <param>
@@ -66,50 +65,18 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>variable</key>
     <param>
       <key>id</key>
-      <value>gain</value>
+      <value>out_buf_size</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
-    <param>
-      <key>label</key>
-      <value></value>
-    </param>
     <param>
       <key>value</key>
-      <value>25</value>
-    </param>
-    <param>
-      <key>min</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>max</key>
-      <value>100</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>
+      <value>96000</value>
     </param>
     <param>
       <key>alias</key>
@@ -117,7 +84,34 @@
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(291, 12)</value>
+      <value>(996, 388)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>antenna</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>'J1'</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(873, 157)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -180,22 +174,26 @@
     </param>
   </block>
   <block>
-    <key>blocks_message_strobe</key>
+    <key>ieee802_11_ofdm_mac</key>
     <param>
       <key>id</key>
-      <value>blocks_message_strobe_0</value>
+      <value>ieee802_11_ofdm_mac_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>msg</key>
-      <value>pmt.intern("        Hello World")</value>
+      <key>src_mac</key>
+      <value>[0x23, 0x23, 0x23, 0x23, 0x23, 0x23]</value>
     </param>
     <param>
-      <key>period</key>
-      <value>300</value>
+      <key>dst_mac</key>
+      <value>[0x42, 0x42, 0x42, 0x42, 0x42, 0x42]</value>
+    </param>
+    <param>
+      <key>bss_mac</key>
+      <value>[0xff, 0xff, 0xff, 0xff, 0xff, 255]</value>
     </param>
     <param>
       <key>alias</key>
@@ -215,7 +213,7 @@
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(113, 154)</value>
+      <value>(446, 187)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -223,58 +221,97 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>blocks_message_strobe</key>
     <param>
       <key>id</key>
-      <value>mult</value>
+      <value>blocks_message_strobe_0_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
-      <value></value>
+      <key>msg</key>
+      <value>pmt.intern("".join("x" for i in range(pdu_length)))</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>
+      <key>period</key>
+      <value>period</value>
     </param>
     <param>
       <key>alias</key>
       <value></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>(979, 10)</value>
+      <value>(81, 135)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_socket_pdu</key>
+    <param>
+      <key>id</key>
+      <value>blocks_socket_pdu_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>"UDP_SERVER"</value>
+    </param>
+    <param>
+      <key>host</key>
+      <value></value>
+    </param>
+    <param>
+      <key>port</key>
+      <value>52001</value>
+    </param>
+    <param>
+      <key>mtu</key>
+      <value>10000</value>
+    </param>
+    <param>
+      <key>tcp_no_delay</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></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>(177, 222)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -337,18 +374,148 @@
     </param>
   </block>
   <block>
-    <key>wifi_phy_hier</key>
+    <key>variable_chooser</key>
     <param>
       <key>id</key>
-      <value>wifi_phy_hier_0</value>
+      <value>freq</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>encoding</key>
-      <value>encoding</value>
+      <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>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(428, 10)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_slider</key>
+    <param>
+      <key>id</key>
+      <value>pdu_length</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value></value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>100</value>
+    </param>
+    <param>
+      <key>min</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>max</key>
+      <value>1500</value>
+    </param>
+    <param>
+      <key>num_steps</key>
+      <value>1000</value>
+    </param>
+    <param>
+      <key>style</key>
+      <value>wx.SL_HORIZONTAL</value>
+    </param>
+    <param>
+      <key>converver</key>
+      <value>int_converter</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value></value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(982, 130)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>foo_packet_pad2</key>
+    <param>
+      <key>id</key>
+      <value>foo_packet_pad2_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>debug</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>delay</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>delay_sec</key>
+      <value>0.01</value>
+    </param>
+    <param>
+      <key>pad_front</key>
+      <value>100</value>
+    </param>
+    <param>
+      <key>pad_tail</key>
+      <value>1000</value>
     </param>
     <param>
       <key>alias</key>
@@ -360,7 +527,7 @@
     </param>
     <param>
       <key>minoutbuf</key>
-      <value>0</value>
+      <value>out_buf_size</value>
     </param>
     <param>
       <key>maxoutbuf</key>
@@ -368,11 +535,184 @@
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(461, 299)</value>
+      <value>(84, 444)</value>
     </param>
     <param>
       <key>_rotation</key>
-      <value>180</value>
+      <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>0e9</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>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(915, 461)</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>.4</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>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(980, 10)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_slider</key>
+    <param>
+      <key>id</key>
+      <value>period</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value></value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>100</value>
+    </param>
+    <param>
+      <key>min</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>max</key>
+      <value>10000</value>
+    </param>
+    <param>
+      <key>num_steps</key>
+      <value>1000</value>
+    </param>
+    <param>
+      <key>style</key>
+      <value>wx.SL_HORIZONTAL</value>
+    </param>
+    <param>
+      <key>converver</key>
+      <value>int_converter</value>
+    </param>
+    <param>
+      <key>grid_pos</key>
+      <value></value>
+    </param>
+    <param>
+      <key>notebook</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(972, 264)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
     </param>
   </block>
   <block>
@@ -419,7 +759,7 @@
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(668, 333)</value>
+      <value>(733, 333)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -427,203 +767,58 @@
     </param>
   </block>
   <block>
-    <key>blocks_multiply_const_vxx</key>
+    <key>variable_slider</key>
     <param>
       <key>id</key>
-      <value>blocks_multiply_const_vxx_0</value>
+      <value>tx_gain</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
+      <key>label</key>
+      <value></value>
     </param>
     <param>
-      <key>const</key>
-      <value>mult</value>
+      <key>value</key>
+      <value>10</value>
     </param>
     <param>
-      <key>vlen</key>
-      <value>1</value>
+      <key>min</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>max</key>
+      <value>100</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>alias</key>
       <value></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>
-  <block>
-    <key>foo_packet_pad2</key>
-    <param>
-      <key>id</key>
-      <value>foo_packet_pad2_0</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>debug</key>
-      <value>False</value>
-    </param>
-    <param>
-      <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>alias</key>
-      <value></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>(86, 444)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <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>src_mac</key>
-      <value>[0x23, 0x23, 0x23, 0x23, 0x23, 0x23]</value>
-    </param>
-    <param>
-      <key>dst_mac</key>
-      <value>[0x42, 0x42, 0x42, 0x42, 0x42, 0x42]</value>
-    </param>
-    <param>
-      <key>bss_mac</key>
-      <value>[0xff, 0xff, 0xff, 0xff, 0xff, 255]</value>
-    </param>
-    <param>
-      <key>alias</key>
-      <value></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>(446, 187)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>blocks_socket_pdu</key>
-    <param>
-      <key>id</key>
-      <value>blocks_socket_pdu_0</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>type</key>
-      <value>"UDP_SERVER"</value>
-    </param>
-    <param>
-      <key>host</key>
-      <value></value>
-    </param>
-    <param>
-      <key>port</key>
-      <value>52001</value>
-    </param>
-    <param>
-      <key>mtu</key>
-      <value>10000</value>
-    </param>
-    <param>
-      <key>tcp_no_delay</key>
-      <value>False</value>
-    </param>
-    <param>
-      <key>alias</key>
-      <value></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>(177, 222)</value>
+      <value>(292, 12)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -782,19 +977,15 @@
     </param>
     <param>
       <key>center_freq0</key>
-      <value>uhd.tune_request(freq, rf_freq = freq - lo_offset, rf_freq_policy=uhd.tune_request.POLICY_MANUAL)</value>
+      <value>uhd.tune_request(freq - lo_offset, lo_offset)</value>
     </param>
     <param>
       <key>gain0</key>
-      <value>gain</value>
-    </param>
-    <param>
-      <key>norm_gain0</key>
-      <value>False</value>
+      <value>tx_gain</value>
     </param>
     <param>
       <key>ant0</key>
-      <value></value>
+      <value>antenna</value>
     </param>
     <param>
       <key>bw0</key>
@@ -808,10 +999,6 @@
       <key>gain1</key>
       <value>0</value>
     </param>
-    <param>
-      <key>norm_gain1</key>
-      <value>False</value>
-    </param>
     <param>
       <key>ant1</key>
       <value></value>
@@ -828,10 +1015,6 @@
       <key>gain2</key>
       <value>0</value>
     </param>
-    <param>
-      <key>norm_gain2</key>
-      <value>False</value>
-    </param>
     <param>
       <key>ant2</key>
       <value></value>
@@ -848,10 +1031,6 @@
       <key>gain3</key>
       <value>0</value>
     </param>
-    <param>
-      <key>norm_gain3</key>
-      <value>False</value>
-    </param>
     <param>
       <key>ant3</key>
       <value></value>
@@ -868,10 +1047,6 @@
       <key>gain4</key>
       <value>0</value>
     </param>
-    <param>
-      <key>norm_gain4</key>
-      <value>False</value>
-    </param>
     <param>
       <key>ant4</key>
       <value></value>
@@ -888,10 +1063,6 @@
       <key>gain5</key>
       <value>0</value>
     </param>
-    <param>
-      <key>norm_gain5</key>
-      <value>False</value>
-    </param>
     <param>
       <key>ant5</key>
       <value></value>
@@ -908,10 +1079,6 @@
       <key>gain6</key>
       <value>0</value>
     </param>
-    <param>
-      <key>norm_gain6</key>
-      <value>False</value>
-    </param>
     <param>
       <key>ant6</key>
       <value></value>
@@ -928,10 +1095,6 @@
       <key>gain7</key>
       <value>0</value>
     </param>
-    <param>
-      <key>norm_gain7</key>
-      <value>False</value>
-    </param>
     <param>
       <key>ant7</key>
       <value></value>
@@ -948,10 +1111,6 @@
       <key>gain8</key>
       <value>0</value>
     </param>
-    <param>
-      <key>norm_gain8</key>
-      <value>False</value>
-    </param>
     <param>
       <key>ant8</key>
       <value></value>
@@ -968,10 +1127,6 @@
       <key>gain9</key>
       <value>0</value>
     </param>
-    <param>
-      <key>norm_gain9</key>
-      <value>False</value>
-    </param>
     <param>
       <key>ant9</key>
       <value></value>
@@ -988,10 +1143,6 @@
       <key>gain10</key>
       <value>0</value>
     </param>
-    <param>
-      <key>norm_gain10</key>
-      <value>False</value>
-    </param>
     <param>
       <key>ant10</key>
       <value></value>
@@ -1008,10 +1159,6 @@
       <key>gain11</key>
       <value>0</value>
     </param>
-    <param>
-      <key>norm_gain11</key>
-      <value>False</value>
-    </param>
     <param>
       <key>ant11</key>
       <value></value>
@@ -1028,10 +1175,6 @@
       <key>gain12</key>
       <value>0</value>
     </param>
-    <param>
-      <key>norm_gain12</key>
-      <value>False</value>
-    </param>
     <param>
       <key>ant12</key>
       <value></value>
@@ -1048,10 +1191,6 @@
       <key>gain13</key>
       <value>0</value>
     </param>
-    <param>
-      <key>norm_gain13</key>
-      <value>False</value>
-    </param>
     <param>
       <key>ant13</key>
       <value></value>
@@ -1068,10 +1207,6 @@
       <key>gain14</key>
       <value>0</value>
     </param>
-    <param>
-      <key>norm_gain14</key>
-      <value>False</value>
-    </param>
     <param>
       <key>ant14</key>
       <value></value>
@@ -1088,10 +1223,6 @@
       <key>gain15</key>
       <value>0</value>
     </param>
-    <param>
-      <key>norm_gain15</key>
-      <value>False</value>
-    </param>
     <param>
       <key>ant15</key>
       <value></value>
@@ -1108,10 +1239,6 @@
       <key>gain16</key>
       <value>0</value>
     </param>
-    <param>
-      <key>norm_gain16</key>
-      <value>False</value>
-    </param>
     <param>
       <key>ant16</key>
       <value></value>
@@ -1128,10 +1255,6 @@
       <key>gain17</key>
       <value>0</value>
     </param>
-    <param>
-      <key>norm_gain17</key>
-      <value>False</value>
-    </param>
     <param>
       <key>ant17</key>
       <value></value>
@@ -1148,10 +1271,6 @@
       <key>gain18</key>
       <value>0</value>
     </param>
-    <param>
-      <key>norm_gain18</key>
-      <value>False</value>
-    </param>
     <param>
       <key>ant18</key>
       <value></value>
@@ -1168,10 +1287,6 @@
       <key>gain19</key>
       <value>0</value>
     </param>
-    <param>
-      <key>norm_gain19</key>
-      <value>False</value>
-    </param>
     <param>
       <key>ant19</key>
       <value></value>
@@ -1188,10 +1303,6 @@
       <key>gain20</key>
       <value>0</value>
     </param>
-    <param>
-      <key>norm_gain20</key>
-      <value>False</value>
-    </param>
     <param>
       <key>ant20</key>
       <value></value>
@@ -1208,10 +1319,6 @@
       <key>gain21</key>
       <value>0</value>
     </param>
-    <param>
-      <key>norm_gain21</key>
-      <value>False</value>
-    </param>
     <param>
       <key>ant21</key>
       <value></value>
@@ -1228,10 +1335,6 @@
       <key>gain22</key>
       <value>0</value>
     </param>
-    <param>
-      <key>norm_gain22</key>
-      <value>False</value>
-    </param>
     <param>
       <key>ant22</key>
       <value></value>
@@ -1248,10 +1351,6 @@
       <key>gain23</key>
       <value>0</value>
     </param>
-    <param>
-      <key>norm_gain23</key>
-      <value>False</value>
-    </param>
     <param>
       <key>ant23</key>
       <value></value>
@@ -1268,10 +1367,6 @@
       <key>gain24</key>
       <value>0</value>
     </param>
-    <param>
-      <key>norm_gain24</key>
-      <value>False</value>
-    </param>
     <param>
       <key>ant24</key>
       <value></value>
@@ -1288,10 +1383,6 @@
       <key>gain25</key>
       <value>0</value>
     </param>
-    <param>
-      <key>norm_gain25</key>
-      <value>False</value>
-    </param>
     <param>
       <key>ant25</key>
       <value></value>
@@ -1308,10 +1399,6 @@
       <key>gain26</key>
       <value>0</value>
     </param>
-    <param>
-      <key>norm_gain26</key>
-      <value>False</value>
-    </param>
     <param>
       <key>ant26</key>
       <value></value>
@@ -1328,10 +1415,6 @@
       <key>gain27</key>
       <value>0</value>
     </param>
-    <param>
-      <key>norm_gain27</key>
-      <value>False</value>
-    </param>
     <param>
       <key>ant27</key>
       <value></value>
@@ -1348,10 +1431,6 @@
       <key>gain28</key>
       <value>0</value>
     </param>
-    <param>
-      <key>norm_gain28</key>
-      <value>False</value>
-    </param>
     <param>
       <key>ant28</key>
       <value></value>
@@ -1368,10 +1447,6 @@
       <key>gain29</key>
       <value>0</value>
     </param>
-    <param>
-      <key>norm_gain29</key>
-      <value>False</value>
-    </param>
     <param>
       <key>ant29</key>
       <value></value>
@@ -1388,10 +1463,6 @@
       <key>gain30</key>
       <value>0</value>
     </param>
-    <param>
-      <key>norm_gain30</key>
-      <value>False</value>
-    </param>
     <param>
       <key>ant30</key>
       <value></value>
@@ -1408,10 +1479,6 @@
       <key>gain31</key>
       <value>0</value>
     </param>
-    <param>
-      <key>norm_gain31</key>
-      <value>False</value>
-    </param>
     <param>
       <key>ant31</key>
       <value></value>
@@ -1442,139 +1509,144 @@
     </param>
   </block>
   <block>
-    <key>variable_chooser</key>
+    <key>wifi_phy_hier</key>
     <param>
       <key>id</key>
-      <value>freq</value>
+      <value>wifi_phy_hier_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Channel</value>
+      <key>encoding</key>
+      <value>encoding</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>
+      <key>chan_est</key>
+      <value>0</value>
     </param>
     <param>
       <key>alias</key>
       <value></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>(419, 11)</value>
+      <value>(461, 299)</value>
     </param>
     <param>
       <key>_rotation</key>
-      <value>0</value>
+      <value>180</value>
     </param>
   </block>
   <block>
-    <key>variable_chooser</key>
+    <key>blocks_null_sink</key>
     <param>
       <key>id</key>
-      <value>lo_offset</value>
+      <value>blocks_null_sink_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
-    <param>
-      <key>label</key>
-      <value>LO Offset</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>choices</key>
-      <value>[0, 6e6, 11e6]</value>
-    </param>
-    <param>
-      <key>labels</key>
-      <value>['0 MHz', '6 MHz', '11 MHz']</value>
-    </param>
     <param>
       <key>type</key>
-      <value>drop_down</value>
+      <value>complex</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.RA_HORIZONTAL</value>
+      <key>vlen</key>
+      <value>1</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value></value>
+      <key>num_inputs</key>
+      <value>1</value>
     </param>
     <param>
-      <key>notebook</key>
-      <value></value>
+      <key>bus_conns</key>
+      <value>[[0,],]</value>
     </param>
     <param>
       <key>alias</key>
       <value></value>
     </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
     <param>
       <key>_coordinate</key>
-      <value>(697, 165)</value>
+      <value>(285, 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>alias</key>
+      <value></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>(89, 363)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>180</value>
+    </param>
   </block>
-  <connection>
-    <source_block_id>blocks_message_strobe_0</source_block_id>
-    <sink_block_id>ieee802_11_ofdm_mac_0</sink_block_id>
-    <source_key>strobe</source_key>
-    <sink_key>app in</sink_key>
-  </connection>
-  <connection>
-    <source_block_id>blocks_socket_pdu_0</source_block_id>
-    <sink_block_id>ieee802_11_ofdm_mac_0</sink_block_id>
-    <source_key>pdus</source_key>
-    <sink_key>app in</sink_key>
-  </connection>
   <connection>
     <source_block_id>foo_packet_pad2_0</source_block_id>
     <sink_block_id>uhd_usrp_sink_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
-  <connection>
-    <source_block_id>wifi_phy_hier_0</source_block_id>
-    <sink_block_id>blocks_multiply_const_vxx_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>
@@ -1599,4 +1671,28 @@
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
+  <connection>
+    <source_block_id>blocks_message_strobe_0_0</source_block_id>
+    <sink_block_id>ieee802_11_ofdm_mac_0</sink_block_id>
+    <source_key>strobe</source_key>
+    <sink_key>app in</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_socket_pdu_0</source_block_id>
+    <sink_block_id>ieee802_11_ofdm_mac_0</sink_block_id>
+    <source_key>pdus</source_key>
+    <sink_key>app in</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>wifi_phy_hier_0</source_block_id>
+    <sink_block_id>blocks_null_sink_0</sink_block_id>
+    <source_key>1</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>wifi_phy_hier_0</source_block_id>
+    <sink_block_id>blocks_multiply_const_vxx_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
 </flow_graph>