diff --git a/grc/CMakeLists.txt b/grc/CMakeLists.txt
index 2c73b8d..6de687a 100644
--- a/grc/CMakeLists.txt
+++ b/grc/CMakeLists.txt
@@ -18,5 +18,8 @@
 # Boston, MA 02110-1301, USA.
 install(FILES
     gsm_receiver_hier.xml
-    gsm_bursts_printer.xml DESTINATION share/gnuradio/grc/blocks
+    gsm_bursts_printer.xml
+    gsm_fcch_burst_tagger.xml
+    gsm_sch_detector.xml
+    gsm_fcch_detector.xml DESTINATION share/gnuradio/grc/blocks
 )
diff --git a/grc/gsm_fcch_burst_tagger.xml b/grc/gsm_fcch_burst_tagger.xml
new file mode 100644
index 0000000..90f5688
--- /dev/null
+++ b/grc/gsm_fcch_burst_tagger.xml
@@ -0,0 +1,28 @@
+<?xml version="1.0"?>
+<block>
+  <name>fcch_burst_tagger</name>
+  <key>gsm_fcch_burst_tagger</key>
+  <category>GSM</category>
+  <import>import gsm</import>
+  <make>gsm.fcch_burst_tagger($OSR)</make>
+  <param>
+    <name>OSR</name>
+    <key>OSR</key>
+    <type>int</type>
+  </param>
+
+  <sink>
+    <name>in</name>
+    <type>complex</type>
+  </sink>
+  
+  <sink>
+    <name>threshold</name>
+    <type>float</type>
+  </sink>
+
+  <source>
+    <name>out</name>
+    <type>complex</type>
+  </source>
+</block>
diff --git a/grc/gsm_fcch_detector.xml b/grc/gsm_fcch_detector.xml
new file mode 100644
index 0000000..32d5379
--- /dev/null
+++ b/grc/gsm_fcch_detector.xml
@@ -0,0 +1,28 @@
+<?xml version="1.0"?>
+<block>
+  <name>fcch_detector</name>
+  <key>gsm_fcch_detector</key>
+  <category>GSM</category>
+  <import>import gsm</import>
+  <make>gsm.fcch_detector($OSR)</make>
+<callback>set_OSR($OSR)</callback>
+  <param>
+    <name>OverSamplingRatio</name>
+    <key>OSR</key>
+    <value>4</value>
+    <type>raw</type>
+  </param>
+  <sink>
+    <name>in</name>
+    <type>complex</type>
+    <vlen>1</vlen>
+  </sink>
+  <source>
+    <name>out</name>
+    <type>complex</type>
+    <vlen>1</vlen>
+  </source>
+  <doc>Piotr Krysik
+Detects positions of FCCH bursts. At the end of each detected FCCH burst adds to the stream a tag with key "fcch" and value which is a frequency offset estimate. The input sampling frequency should be integer multiply of GSM GMKS symbol rate - 1625000/6 Hz.</doc>
+  <grc_source>/home/piotr/Odbiornik_gsm/gr-gsm/examples/gsm_fcch_detector.grc</grc_source>
+</block>
diff --git a/grc/gsm_sch_detector.xml b/grc/gsm_sch_detector.xml
new file mode 100644
index 0000000..7832f4a
--- /dev/null
+++ b/grc/gsm_sch_detector.xml
@@ -0,0 +1,24 @@
+<?xml version="1.0"?>
+<block>
+  <name>sch_detector</name>
+  <key>gsm_sch_detector</key>
+  <category>GSM</category>
+  <import>import gsm</import>
+  <make>gsm.sch_detector($OSR)</make>
+  <param>
+    <name>OSR</name>
+    <key>OSR</key>
+    <type>int</type>
+<!--    <value>OSR</value>-->
+  </param>
+
+  <sink>
+    <name>in</name>
+    <type>complex</type>
+  </sink>
+
+  <source>
+    <name>out</name>
+    <type>complex</type>
+  </source>
+</block>