--- /dev/null
+<?xml version="1.0"?>
+<!--
+###################################################
+##VCO
+###################################################
+ -->
+<block>
+ <name>VCO</name>
+ <key>gr_vco_f</key>
+ <import>from gnuradio import gr</import>
+ <make>gr.vco_f($samp_rate, $sensitivity, $amplitude)</make>
+ <param>
+ <name>Sample Rate</name>
+ <key>samp_rate</key>
+ <type>real</type>
+ </param>
+ <param>
+ <name>Sensitivity</name>
+ <key>sensitivity</key>
+ <type>real</type>
+ </param>
+ <param>
+ <name>Amplitude</name>
+ <key>amplitude</key>
+ <type>real</type>
+ </param>
+ <sink>
+ <name>in</name>
+ <type>float</type>
+ </sink>
+ <source>
+ <name>out</name>
+ <type>float</type>
+ </source>
+</block>