--- /dev/null
+<?xml version="1.0"?>
+<!--
+###################################################
+##Detect Peak
+###################################################
+ -->
+<block>
+ <name>Detect Peak</name>
+ <key>gr_dpll_bb</key>
+ <import>from gnuradio import gr</import>
+ <make>gr.dpll_bb($period, $gain)</make>
+ <param>
+ <name>Period</name>
+ <key>period</key>
+ <type>real</type>
+ </param>
+ <param>
+ <name>Gain</name>
+ <key>gain</key>
+ <type>real</type>
+ </param>
+ <sink>
+ <name>in</name>
+ <type>byte</type>
+ </sink>
+ <source>
+ <name>out</name>
+ <type>byte</type>
+ </source>
+</block>