diff --git a/lib/uhd/uhd_source_c.cc b/lib/uhd/uhd_source_c.cc
index 203caf4..9bdcd27 100644
--- a/lib/uhd/uhd_source_c.cc
+++ b/lib/uhd/uhd_source_c.cc
@@ -55,7 +55,8 @@ uhd_source_c::uhd_source_c(const std::string &args) :
   BOOST_FOREACH( dict_t::value_type &entry, dict ) {
     if ( "uhd" != entry.first &&
          "nchan" != entry.first &&
-         "subdev" != entry.first ) {
+         "subdev" != entry.first &&
+         "lo_offset" != entry.first ) {
       arguments += entry.first + "=" + entry.second + ",";
     }
   }
@@ -66,6 +67,10 @@ uhd_source_c::uhd_source_c(const std::string &args) :

   if (dict.count("subdev"))
     _src->set_subdev_spec( dict["subdev"] );
+
+  _offset = 0.0;
+  if (dict.count("lo_offset"))
+    _offset = boost::lexical_cast< double >( dict["lo_offset"] );

   for ( size_t i = 0; i < nchan; i++ )
     connect( _src, i, self(), i );
@@ -167,7 +172,10 @@ osmosdr::freq_range_t uhd_source_c::get_freq_range( size_t chan )

 double uhd_source_c::set_center_freq( double freq, size_t chan )
 {
-  _src->set_center_freq(freq, chan);
+	//advanced tuning with tune_request_t
+	uhd::tune_request_t tune_req(freq, _offset);
+
+  _src->set_center_freq(tune_req, chan);

   return get_center_freq(chan);
 }
diff --git a/lib/uhd/uhd_source_c.h b/lib/uhd/uhd_source_c.h
index 9c193ae..4e1d60c 100644
--- a/lib/uhd/uhd_source_c.h
+++ b/lib/uhd/uhd_source_c.h
@@ -72,12 +72,14 @@ public:
   double get_gain( size_t chan = 0 );
   double get_gain( const std::string & name, size_t chan = 0 );

+
   std::vector< std::string > get_antennas( size_t chan = 0 );
   std::string set_antenna( const std::string & antenna, size_t chan = 0 );
   std::string get_antenna( size_t chan = 0 );

 private:
   boost::shared_ptr<uhd_usrp_source> _src;
+  double _offset;
 };

 #endif // UHD_SOURCE_C_H