--- /dev/null
+<?xml version="1.0"?>
+<!--
+###################################################
+##PLL Frequency Det
+###################################################
+ -->
+<block>
+ <name>PLL Freq Det</name>
+ <key>gr_pll_freqdet_cf</key>
+ <import>from gnuradio import gr</import>
+ <make>gr.pll_freqdet_cf($alpha, $beta, $max_freq, $min_freq)</make>
+ <param>
+ <name>Alpha</name>
+ <key>alpha</key>
+ <type>real</type>
+ </param>
+ <param>
+ <name>Beta</name>
+ <key>beta</key>
+ <type>real</type>
+ </param>
+ <param>
+ <name>Max Freq</name>
+ <key>max_freq</key>
+ <type>real</type>
+ </param>
+ <param>
+ <name>Min Freq</name>
+ <key>min_freq</key>
+ <type>real</type>
+ </param>
+ <sink>
+ <name>in</name>
+ <type>complex</type>
+ </sink>
+ <source>
+ <name>out</name>
+ <type>float</type>
+ </source>
+</block>