diff --git a/src/algorithms/acquisition/adapters/galileo_e1_pcps_8ms_ambiguous_acquisition.cc b/src/algorithms/acquisition/adapters/galileo_e1_pcps_8ms_ambiguous_acquisition.cc
index 99ed34d6a..314272a01 100644
--- a/src/algorithms/acquisition/adapters/galileo_e1_pcps_8ms_ambiguous_acquisition.cc
+++ b/src/algorithms/acquisition/adapters/galileo_e1_pcps_8ms_ambiguous_acquisition.cc
@@ -106,6 +106,7 @@ GalileoE1Pcps8msAmbiguousAcquisition::GalileoE1Pcps8msAmbiguousAcquisition(
             LOG(WARNING) << item_type_
                     << " unknown acquisition item type";
         }
+    gnss_synchro_ = {0};
 }
 
 
diff --git a/src/algorithms/acquisition/adapters/galileo_e1_pcps_ambiguous_acquisition.cc b/src/algorithms/acquisition/adapters/galileo_e1_pcps_ambiguous_acquisition.cc
index 2bf588b9d..67d706bf1 100644
--- a/src/algorithms/acquisition/adapters/galileo_e1_pcps_ambiguous_acquisition.cc
+++ b/src/algorithms/acquisition/adapters/galileo_e1_pcps_ambiguous_acquisition.cc
@@ -116,6 +116,7 @@ GalileoE1PcpsAmbiguousAcquisition::GalileoE1PcpsAmbiguousAcquisition(
             LOG(WARNING) << item_type_
                     << " unknown acquisition item type";
         }
+    gnss_synchro_ = {0};
 }
 
 
diff --git a/src/algorithms/acquisition/adapters/galileo_e1_pcps_cccwsr_ambiguous_acquisition.cc b/src/algorithms/acquisition/adapters/galileo_e1_pcps_cccwsr_ambiguous_acquisition.cc
index 43f8b301b..524f5e472 100644
--- a/src/algorithms/acquisition/adapters/galileo_e1_pcps_cccwsr_ambiguous_acquisition.cc
+++ b/src/algorithms/acquisition/adapters/galileo_e1_pcps_cccwsr_ambiguous_acquisition.cc
@@ -106,6 +106,7 @@ GalileoE1PcpsCccwsrAmbiguousAcquisition::GalileoE1PcpsCccwsrAmbiguousAcquisition
             LOG(WARNING) << item_type_
                     << " unknown acquisition item type";
         }
+    gnss_synchro_ = {0};
 }
 
 
diff --git a/src/algorithms/acquisition/adapters/galileo_e1_pcps_quicksync_ambiguous_acquisition.cc b/src/algorithms/acquisition/adapters/galileo_e1_pcps_quicksync_ambiguous_acquisition.cc
index 1d524253f..982063ac3 100644
--- a/src/algorithms/acquisition/adapters/galileo_e1_pcps_quicksync_ambiguous_acquisition.cc
+++ b/src/algorithms/acquisition/adapters/galileo_e1_pcps_quicksync_ambiguous_acquisition.cc
@@ -140,6 +140,7 @@ GalileoE1PcpsQuickSyncAmbiguousAcquisition::GalileoE1PcpsQuickSyncAmbiguousAcqui
             LOG(WARNING) << item_type_
                     << " unknown acquisition item type";
         }
+    gnss_synchro_ = {0};
 }
 
 
diff --git a/src/algorithms/acquisition/adapters/galileo_e1_pcps_tong_ambiguous_acquisition.cc b/src/algorithms/acquisition/adapters/galileo_e1_pcps_tong_ambiguous_acquisition.cc
index 20f6f4995..7d4609d7b 100644
--- a/src/algorithms/acquisition/adapters/galileo_e1_pcps_tong_ambiguous_acquisition.cc
+++ b/src/algorithms/acquisition/adapters/galileo_e1_pcps_tong_ambiguous_acquisition.cc
@@ -107,6 +107,7 @@ GalileoE1PcpsTongAmbiguousAcquisition::GalileoE1PcpsTongAmbiguousAcquisition(
             LOG(WARNING) << item_type_
                     << " unknown acquisition item type";
         }
+    gnss_synchro_ = {0};
 }
 
 
diff --git a/src/algorithms/acquisition/adapters/galileo_e5a_noncoherent_iq_acquisition_caf.cc b/src/algorithms/acquisition/adapters/galileo_e5a_noncoherent_iq_acquisition_caf.cc
index 740a6d915..9906bce36 100644
--- a/src/algorithms/acquisition/adapters/galileo_e5a_noncoherent_iq_acquisition_caf.cc
+++ b/src/algorithms/acquisition/adapters/galileo_e5a_noncoherent_iq_acquisition_caf.cc
@@ -114,7 +114,7 @@ GalileoE5aNoncoherentIQAcquisitionCaf::GalileoE5aNoncoherentIQAcquisitionCaf(
             LOG(WARNING) << item_type_
                     << " unknown acquisition item type";
         }
-
+    gnss_synchro_ = {0};
 }
 
 GalileoE5aNoncoherentIQAcquisitionCaf::~GalileoE5aNoncoherentIQAcquisitionCaf()
diff --git a/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_acquisition.cc b/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_acquisition.cc
index 22f169980..bbebe9a37 100644
--- a/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_acquisition.cc
+++ b/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_acquisition.cc
@@ -121,6 +121,7 @@ GpsL1CaPcpsAcquisition::GpsL1CaPcpsAcquisition(
     threshold_ = 0.0;
     doppler_max_ = 0;
     doppler_step_ = 0;
+    gnss_synchro_ = {0};
 }
 
 
diff --git a/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_acquisition_fine_doppler.cc b/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_acquisition_fine_doppler.cc
index 0dfbcbb2f..597bbcf66 100644
--- a/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_acquisition_fine_doppler.cc
+++ b/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_acquisition_fine_doppler.cc
@@ -86,6 +86,7 @@ GpsL1CaPcpsAcquisitionFineDoppler::GpsL1CaPcpsAcquisitionFineDoppler(
     {
         LOG(WARNING) << item_type_ << " unknown acquisition item type";
     }
+    gnss_synchro_ = {0};
 }
 
 
diff --git a/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_assisted_acquisition.cc b/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_assisted_acquisition.cc
index 4eff7d287..dccbb10de 100644
--- a/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_assisted_acquisition.cc
+++ b/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_assisted_acquisition.cc
@@ -85,6 +85,7 @@ GpsL1CaPcpsAssistedAcquisition::GpsL1CaPcpsAssistedAcquisition(
     {
         LOG(WARNING) << item_type_ << " unknown acquisition item type";
     }
+    gnss_synchro_ = {0};
 }
 
 
diff --git a/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_multithread_acquisition.cc b/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_multithread_acquisition.cc
index 0cd57fd73..0c549fc16 100644
--- a/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_multithread_acquisition.cc
+++ b/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_multithread_acquisition.cc
@@ -103,6 +103,7 @@ GpsL1CaPcpsMultithreadAcquisition::GpsL1CaPcpsMultithreadAcquisition(
     {
         LOG(WARNING) << item_type_ << " unknown acquisition item type";
     }
+    gnss_synchro_ = {0};
 }
 
 
diff --git a/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_opencl_acquisition.cc b/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_opencl_acquisition.cc
index 84ade51b7..8172e7fc2 100644
--- a/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_opencl_acquisition.cc
+++ b/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_opencl_acquisition.cc
@@ -102,6 +102,7 @@ GpsL1CaPcpsOpenClAcquisition::GpsL1CaPcpsOpenClAcquisition(
     {
         LOG(WARNING) << item_type_ << " unknown acquisition item type";
     }
+    gnss_synchro_ = {0};
 }
 
 
diff --git a/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_quicksync_acquisition.cc b/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_quicksync_acquisition.cc
index eb24b86fe..b2ae27845 100644
--- a/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_quicksync_acquisition.cc
+++ b/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_quicksync_acquisition.cc
@@ -135,7 +135,7 @@ GpsL1CaPcpsQuickSyncAcquisition::GpsL1CaPcpsQuickSyncAcquisition(
             LOG(WARNING) << item_type_ << " unknown acquisition item type";
         }
 
-
+    gnss_synchro_ = {0};
 }
 
 
diff --git a/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_tong_acquisition.cc b/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_tong_acquisition.cc
index 10ffc7c8e..655b20e4e 100644
--- a/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_tong_acquisition.cc
+++ b/src/algorithms/acquisition/adapters/gps_l1_ca_pcps_tong_acquisition.cc
@@ -95,6 +95,7 @@ GpsL1CaPcpsTongAcquisition::GpsL1CaPcpsTongAcquisition(
         {
             LOG(WARNING) << item_type_ << " unknown acquisition item type";
         }
+    gnss_synchro_ = {0};
 }
 
 
diff --git a/src/algorithms/acquisition/adapters/gps_l2_m_pcps_acquisition.cc b/src/algorithms/acquisition/adapters/gps_l2_m_pcps_acquisition.cc
index 855bb950c..e3a77c560 100644
--- a/src/algorithms/acquisition/adapters/gps_l2_m_pcps_acquisition.cc
+++ b/src/algorithms/acquisition/adapters/gps_l2_m_pcps_acquisition.cc
@@ -118,6 +118,7 @@ GpsL2MPcpsAcquisition::GpsL2MPcpsAcquisition(
     //     LOG(WARNING) << item_type_
     //             << " unknown acquisition item type";
     // }
+    gnss_synchro_ = {0};
 }
 
 
diff --git a/src/algorithms/observables/adapters/galileo_e1_observables.cc b/src/algorithms/observables/adapters/galileo_e1_observables.cc
index d4026627d..504514a43 100644
--- a/src/algorithms/observables/adapters/galileo_e1_observables.cc
+++ b/src/algorithms/observables/adapters/galileo_e1_observables.cc
@@ -55,9 +55,7 @@ GalileoE1Observables::GalileoE1Observables(ConfigurationInterface* configuration
     flag_averaging = configuration->property(role + ".flag_averaging", false);
     dump_ = configuration->property(role + ".dump", false);
     dump_filename_ = configuration->property(role + ".dump_filename", default_dump_filename);
-    fs_in_ = configuration->property("GNSS-SDR.internal_fs_hz", 2048000);
     observables_ = galileo_e1_make_observables_cc(in_streams_, queue_, dump_, dump_filename_, output_rate_ms, flag_averaging);
-    observables_->set_fs_in(fs_in_);
     DLOG(INFO) << "pseudorange(" << observables_->unique_id() << ")";
 }
 
diff --git a/src/algorithms/observables/adapters/galileo_e1_observables.h b/src/algorithms/observables/adapters/galileo_e1_observables.h
index c59979c5a..2c7ce44de 100644
--- a/src/algorithms/observables/adapters/galileo_e1_observables.h
+++ b/src/algorithms/observables/adapters/galileo_e1_observables.h
@@ -82,7 +82,6 @@ public:
 private:
     galileo_e1_observables_cc_sptr observables_;
     bool dump_;
-    unsigned int fs_in_;
     std::string dump_filename_;
     std::string role_;
     unsigned int in_streams_;
diff --git a/src/algorithms/observables/adapters/gps_l1_ca_observables.cc b/src/algorithms/observables/adapters/gps_l1_ca_observables.cc
index c97036267..40a5a920c 100644
--- a/src/algorithms/observables/adapters/gps_l1_ca_observables.cc
+++ b/src/algorithms/observables/adapters/gps_l1_ca_observables.cc
@@ -55,9 +55,9 @@ GpsL1CaObservables::GpsL1CaObservables(ConfigurationInterface* configuration,
     flag_averaging = configuration->property(role + ".flag_averaging", false);
     dump_ = configuration->property(role + ".dump", false);
     dump_filename_ = configuration->property(role + ".dump_filename", default_dump_filename);
-    fs_in_ = configuration->property("GNSS-SDR.internal_fs_hz", 2048000);
+    //fs_in_ = configuration->property("GNSS-SDR.internal_fs_hz", 2048000);
     observables_ = gps_l1_ca_make_observables_cc(in_streams_, queue_, dump_, dump_filename_, output_rate_ms, flag_averaging);
-    observables_->set_fs_in(fs_in_);
+    //observables_->set_fs_in(fs_in_);
     DLOG(INFO) << "pseudorange(" << observables_->unique_id() << ")";
 }
 
diff --git a/src/algorithms/observables/adapters/gps_l1_ca_observables.h b/src/algorithms/observables/adapters/gps_l1_ca_observables.h
index bf7d64eb7..8e8f49f40 100644
--- a/src/algorithms/observables/adapters/gps_l1_ca_observables.h
+++ b/src/algorithms/observables/adapters/gps_l1_ca_observables.h
@@ -81,7 +81,7 @@ public:
 private:
     gps_l1_ca_observables_cc_sptr observables_;
     bool dump_;
-    unsigned int fs_in_;
+    //unsigned int fs_in_;
     std::string dump_filename_;
     std::string role_;
     unsigned int in_streams_;
diff --git a/src/algorithms/observables/adapters/hybrid_observables.cc b/src/algorithms/observables/adapters/hybrid_observables.cc
index e9fb49f95..145c5d0fd 100644
--- a/src/algorithms/observables/adapters/hybrid_observables.cc
+++ b/src/algorithms/observables/adapters/hybrid_observables.cc
@@ -55,9 +55,7 @@ HybridObservables::HybridObservables(ConfigurationInterface* configuration,
     flag_averaging = configuration->property(role + ".flag_averaging", false);
     dump_ = configuration->property(role + ".dump", false);
     dump_filename_ = configuration->property(role + ".dump_filename", default_dump_filename);
-    fs_in_ = configuration->property("GNSS-SDR.internal_fs_hz", 2048000);
     observables_ = hybrid_make_observables_cc(in_streams_, queue_, dump_, dump_filename_, output_rate_ms, flag_averaging);
-    observables_->set_fs_in(fs_in_);
     DLOG(INFO) << "pseudorange(" << observables_->unique_id() << ")";
 }
 
diff --git a/src/algorithms/observables/adapters/hybrid_observables.h b/src/algorithms/observables/adapters/hybrid_observables.h
index 59c712032..49fa99f32 100644
--- a/src/algorithms/observables/adapters/hybrid_observables.h
+++ b/src/algorithms/observables/adapters/hybrid_observables.h
@@ -82,7 +82,6 @@ public:
 private:
     hybrid_observables_cc_sptr observables_;
     bool dump_;
-    unsigned int fs_in_;
     std::string dump_filename_;
     std::string role_;
     unsigned int in_streams_;
diff --git a/src/algorithms/observables/gnuradio_blocks/galileo_e1_observables_cc.cc b/src/algorithms/observables/gnuradio_blocks/galileo_e1_observables_cc.cc
index 7ad6561ec..ea542db87 100644
--- a/src/algorithms/observables/gnuradio_blocks/galileo_e1_observables_cc.cc
+++ b/src/algorithms/observables/gnuradio_blocks/galileo_e1_observables_cc.cc
@@ -116,7 +116,7 @@ int galileo_e1_observables_cc::general_work (int noutput_items, gr_vector_int &n
     Gnss_Synchro current_gnss_synchro[d_nchannels];
     std::map<int,Gnss_Synchro> current_gnss_synchro_map;
     std::map<int,Gnss_Synchro>::iterator gnss_synchro_iter;
-    d_sample_counter++; //count for the processed samples
+
     /*
      * 1. Read the GNSS SYNCHRO objects from available channels
      */
diff --git a/src/algorithms/observables/gnuradio_blocks/galileo_e1_observables_cc.h b/src/algorithms/observables/gnuradio_blocks/galileo_e1_observables_cc.h
index d043db483..131d76fb5 100644
--- a/src/algorithms/observables/gnuradio_blocks/galileo_e1_observables_cc.h
+++ b/src/algorithms/observables/gnuradio_blocks/galileo_e1_observables_cc.h
@@ -61,7 +61,7 @@ class galileo_e1_observables_cc : public gr::block
 {
 public:
     ~galileo_e1_observables_cc ();
-    void set_fs_in(unsigned long int fs_in) {d_fs_in = fs_in;};
+    //void set_fs_in(unsigned long int fs_in) {d_fs_in = fs_in;};
     int general_work (int noutput_items, gr_vector_int &ninput_items,
             gr_vector_const_void_star &input_items, gr_vector_void_star &output_items);
 
@@ -74,9 +74,7 @@ private:
     boost::shared_ptr<gr::msg_queue> d_queue;
     bool d_dump;
     bool d_flag_averaging;
-    long int d_sample_counter;
     unsigned int d_nchannels;
-    unsigned long int d_fs_in;
     int d_output_rate_ms;
     std::string d_dump_filename;
     std::ofstream d_dump_file;
diff --git a/src/algorithms/observables/gnuradio_blocks/gps_l1_ca_observables_cc.cc b/src/algorithms/observables/gnuradio_blocks/gps_l1_ca_observables_cc.cc
index 0e707c5d4..8df2646f5 100644
--- a/src/algorithms/observables/gnuradio_blocks/gps_l1_ca_observables_cc.cc
+++ b/src/algorithms/observables/gnuradio_blocks/gps_l1_ca_observables_cc.cc
@@ -112,7 +112,6 @@ int gps_l1_ca_observables_cc::general_work (int noutput_items, gr_vector_int &ni
     std::map<int,Gnss_Synchro> current_gnss_synchro_map;
     std::map<int,Gnss_Synchro>::iterator gnss_synchro_iter;
 
-    d_sample_counter++; //count for the processed samples
     /*
      * 1. Read the GNSS SYNCHRO objects from available channels
      */
diff --git a/src/algorithms/observables/gnuradio_blocks/gps_l1_ca_observables_cc.h b/src/algorithms/observables/gnuradio_blocks/gps_l1_ca_observables_cc.h
index b312b1a58..7f7dacb63 100644
--- a/src/algorithms/observables/gnuradio_blocks/gps_l1_ca_observables_cc.h
+++ b/src/algorithms/observables/gnuradio_blocks/gps_l1_ca_observables_cc.h
@@ -59,7 +59,7 @@ class gps_l1_ca_observables_cc : public gr::block
 {
 public:
     ~gps_l1_ca_observables_cc ();
-    void set_fs_in(unsigned long int fs_in) {d_fs_in = fs_in;};
+    //void set_fs_in(unsigned long int fs_in) {d_fs_in = fs_in;};
     int general_work (int noutput_items, gr_vector_int &ninput_items,
             gr_vector_const_void_star &input_items, gr_vector_void_star &output_items);
 
@@ -72,9 +72,7 @@ private:
     boost::shared_ptr<gr::msg_queue> d_queue;
     bool d_dump;
     bool d_flag_averaging;
-    long int d_sample_counter;
     unsigned int d_nchannels;
-    unsigned long int d_fs_in;
     int d_output_rate_ms;
     std::string d_dump_filename;
     std::ofstream d_dump_file;
diff --git a/src/algorithms/observables/gnuradio_blocks/hybrid_observables_cc.cc b/src/algorithms/observables/gnuradio_blocks/hybrid_observables_cc.cc
index c06af369d..fee182c22 100644
--- a/src/algorithms/observables/gnuradio_blocks/hybrid_observables_cc.cc
+++ b/src/algorithms/observables/gnuradio_blocks/hybrid_observables_cc.cc
@@ -120,7 +120,7 @@ int hybrid_observables_cc::general_work (int noutput_items, gr_vector_int &ninpu
     std::map<int,Gnss_Synchro> current_gnss_synchro_map;
     std::map<int,Gnss_Synchro> current_gnss_synchro_map_gps_only;
     std::map<int,Gnss_Synchro>::iterator gnss_synchro_iter;
-    d_sample_counter++; //count for the processed samples
+
     /*
      * 1. Read the GNSS SYNCHRO objects from available channels
      */
diff --git a/src/algorithms/observables/gnuradio_blocks/hybrid_observables_cc.h b/src/algorithms/observables/gnuradio_blocks/hybrid_observables_cc.h
index e6a7134cd..5749726c3 100644
--- a/src/algorithms/observables/gnuradio_blocks/hybrid_observables_cc.h
+++ b/src/algorithms/observables/gnuradio_blocks/hybrid_observables_cc.h
@@ -61,7 +61,7 @@ class hybrid_observables_cc : public gr::block
 {
 public:
     ~hybrid_observables_cc ();
-    void set_fs_in(unsigned long int fs_in) {d_fs_in = fs_in;};
+    //void set_fs_in(unsigned long int fs_in) {d_fs_in = fs_in;};
     int general_work (int noutput_items, gr_vector_int &ninput_items,
             gr_vector_const_void_star &input_items, gr_vector_void_star &output_items);
 
@@ -74,9 +74,7 @@ private:
     boost::shared_ptr<gr::msg_queue> d_queue;
     bool d_dump;
     bool d_flag_averaging;
-    long int d_sample_counter;
     unsigned int d_nchannels;
-    unsigned long int d_fs_in;
     int d_output_rate_ms;
     std::string d_dump_filename;
     std::ofstream d_dump_file;
diff --git a/src/tests/gnss_block/fir_filter_test.cc b/src/tests/gnss_block/fir_filter_test.cc
index 03994a888..4ba9a066a 100644
--- a/src/tests/gnss_block/fir_filter_test.cc
+++ b/src/tests/gnss_block/fir_filter_test.cc
@@ -57,6 +57,7 @@ protected:
     Fir_Filter_Test()
     {
         queue = gr::msg_queue::make(0);
+        item_size = sizeof(gr_complex);
         config = std::make_shared<InMemoryConfiguration>();
     }
     ~Fir_Filter_Test()
diff --git a/src/tests/gnss_block/galileo_e1_dll_pll_veml_tracking_test.cc b/src/tests/gnss_block/galileo_e1_dll_pll_veml_tracking_test.cc
index 5d02ccf1e..b2c628e3d 100644
--- a/src/tests/gnss_block/galileo_e1_dll_pll_veml_tracking_test.cc
+++ b/src/tests/gnss_block/galileo_e1_dll_pll_veml_tracking_test.cc
@@ -59,6 +59,7 @@ protected:
         item_size = sizeof(gr_complex);
         stop = false;
         message = 0;
+        gnss_synchro = {0};
     }
 
     ~GalileoE1DllPllVemlTrackingInternalTest()
diff --git a/src/tests/gnss_block/galileo_e1_pcps_8ms_ambiguous_acquisition_gsoc2013_test.cc b/src/tests/gnss_block/galileo_e1_pcps_8ms_ambiguous_acquisition_gsoc2013_test.cc
index 0e67f110c..02d5854c0 100644
--- a/src/tests/gnss_block/galileo_e1_pcps_8ms_ambiguous_acquisition_gsoc2013_test.cc
+++ b/src/tests/gnss_block/galileo_e1_pcps_8ms_ambiguous_acquisition_gsoc2013_test.cc
@@ -61,6 +61,7 @@ protected:
         stop = false;
         message = 0;
         factory = std::make_shared<GNSSBlockFactory>();
+        gnss_synchro = {0};
     }
 
     ~GalileoE1Pcps8msAmbiguousAcquisitionGSoC2013Test()
diff --git a/src/tests/gnss_block/galileo_e1_pcps_ambiguous_acquisition_gsoc2013_test.cc b/src/tests/gnss_block/galileo_e1_pcps_ambiguous_acquisition_gsoc2013_test.cc
index 37826556c..7cb8cb496 100644
--- a/src/tests/gnss_block/galileo_e1_pcps_ambiguous_acquisition_gsoc2013_test.cc
+++ b/src/tests/gnss_block/galileo_e1_pcps_ambiguous_acquisition_gsoc2013_test.cc
@@ -61,6 +61,7 @@ protected:
         item_size = sizeof(gr_complex);
         stop = false;
         message = 0;
+        gnss_synchro = {0};
     }
 
     ~GalileoE1PcpsAmbiguousAcquisitionGSoC2013Test()
diff --git a/src/tests/gnss_block/galileo_e1_pcps_ambiguous_acquisition_gsoc_test.cc b/src/tests/gnss_block/galileo_e1_pcps_ambiguous_acquisition_gsoc_test.cc
index 53f84ed1a..bb96f5611 100644
--- a/src/tests/gnss_block/galileo_e1_pcps_ambiguous_acquisition_gsoc_test.cc
+++ b/src/tests/gnss_block/galileo_e1_pcps_ambiguous_acquisition_gsoc_test.cc
@@ -70,6 +70,7 @@ protected:
         item_size = sizeof(gr_complex);
         stop = false;
         message = 0;
+        gnss_synchro = {0};
     }
 
     ~GalileoE1PcpsAmbiguousAcquisitionGSoCTest()
diff --git a/src/tests/gnss_block/galileo_e1_pcps_ambiguous_acquisition_test.cc b/src/tests/gnss_block/galileo_e1_pcps_ambiguous_acquisition_test.cc
index 88fe3a141..5531b14ca 100644
--- a/src/tests/gnss_block/galileo_e1_pcps_ambiguous_acquisition_test.cc
+++ b/src/tests/gnss_block/galileo_e1_pcps_ambiguous_acquisition_test.cc
@@ -60,6 +60,7 @@ protected:
         item_size = sizeof(gr_complex);
         stop = false;
         message = 0;
+        gnss_synchro = {0};
 }
 
     ~GalileoE1PcpsAmbiguousAcquisitionTest()
diff --git a/src/tests/gnss_block/galileo_e1_pcps_cccwsr_ambiguous_acquisition_gsoc2013_test.cc b/src/tests/gnss_block/galileo_e1_pcps_cccwsr_ambiguous_acquisition_gsoc2013_test.cc
index 807620869..76f4d60ea 100644
--- a/src/tests/gnss_block/galileo_e1_pcps_cccwsr_ambiguous_acquisition_gsoc2013_test.cc
+++ b/src/tests/gnss_block/galileo_e1_pcps_cccwsr_ambiguous_acquisition_gsoc2013_test.cc
@@ -61,6 +61,7 @@ protected:
         item_size = sizeof(gr_complex);
         stop = false;
         message = 0;
+        gnss_synchro = {0};
     }
 
     ~GalileoE1PcpsCccwsrAmbiguousAcquisitionTest()
diff --git a/src/tests/gnss_block/galileo_e1_pcps_quicksync_ambiguous_acquisition_gsoc2014_test.cc b/src/tests/gnss_block/galileo_e1_pcps_quicksync_ambiguous_acquisition_gsoc2014_test.cc
index b333a1218..d63e389e3 100644
--- a/src/tests/gnss_block/galileo_e1_pcps_quicksync_ambiguous_acquisition_gsoc2014_test.cc
+++ b/src/tests/gnss_block/galileo_e1_pcps_quicksync_ambiguous_acquisition_gsoc2014_test.cc
@@ -67,6 +67,7 @@ protected:
         item_size = sizeof(gr_complex);
         stop = false;
         message = 0;
+        gnss_synchro = {0};
 }
 
     ~GalileoE1PcpsQuickSyncAmbiguousAcquisitionGSoC2014Test()
diff --git a/src/tests/gnss_block/galileo_e1_pcps_tong_ambiguous_acquisition_gsoc2013_test.cc b/src/tests/gnss_block/galileo_e1_pcps_tong_ambiguous_acquisition_gsoc2013_test.cc
index 2fa325624..eba137ac9 100644
--- a/src/tests/gnss_block/galileo_e1_pcps_tong_ambiguous_acquisition_gsoc2013_test.cc
+++ b/src/tests/gnss_block/galileo_e1_pcps_tong_ambiguous_acquisition_gsoc2013_test.cc
@@ -67,6 +67,7 @@ protected:
         item_size = sizeof(gr_complex);
         stop = false;
         message = 0;
+        gnss_synchro = {0};
     }
 
     ~GalileoE1PcpsTongAmbiguousAcquisitionGSoC2013Test()
diff --git a/src/tests/gnss_block/galileo_e5a_pcps_acquisition_gsoc2014_gensource_test.cc b/src/tests/gnss_block/galileo_e5a_pcps_acquisition_gsoc2014_gensource_test.cc
index 0da42fed8..bace632f6 100644
--- a/src/tests/gnss_block/galileo_e5a_pcps_acquisition_gsoc2014_gensource_test.cc
+++ b/src/tests/gnss_block/galileo_e5a_pcps_acquisition_gsoc2014_gensource_test.cc
@@ -62,6 +62,7 @@ protected:
         item_size = sizeof(gr_complex);
         stop = false;
         message = 0;
+        gnss_synchro = {0};
 }
 
     ~GalileoE5aPcpsAcquisitionGSoC2014GensourceTest()
diff --git a/src/tests/gnss_block/galileo_e5a_tracking_test.cc b/src/tests/gnss_block/galileo_e5a_tracking_test.cc
index 108941a05..3639cc391 100644
--- a/src/tests/gnss_block/galileo_e5a_tracking_test.cc
+++ b/src/tests/gnss_block/galileo_e5a_tracking_test.cc
@@ -58,6 +58,7 @@ protected:
         item_size = sizeof(gr_complex);
         stop = false;
         message = 0;
+        gnss_synchro = {0};
     }
 
     ~GalileoE5aTrackingTest()
diff --git a/src/tests/gnss_block/gps_l1_ca_pcps_acquisition_gsoc2013_test.cc b/src/tests/gnss_block/gps_l1_ca_pcps_acquisition_gsoc2013_test.cc
index bb7b2170f..42fffb71f 100644
--- a/src/tests/gnss_block/gps_l1_ca_pcps_acquisition_gsoc2013_test.cc
+++ b/src/tests/gnss_block/gps_l1_ca_pcps_acquisition_gsoc2013_test.cc
@@ -62,6 +62,7 @@ protected:
         item_size = sizeof(gr_complex);
         stop = false;
         message = 0;
+        gnss_synchro = {0};
     }
 
     ~GpsL1CaPcpsAcquisitionGSoC2013Test()
diff --git a/src/tests/gnss_block/gps_l1_ca_pcps_acquisition_test.cc b/src/tests/gnss_block/gps_l1_ca_pcps_acquisition_test.cc
index 3d0ead13a..cfd14c82e 100644
--- a/src/tests/gnss_block/gps_l1_ca_pcps_acquisition_test.cc
+++ b/src/tests/gnss_block/gps_l1_ca_pcps_acquisition_test.cc
@@ -62,6 +62,7 @@ protected:
         item_size = sizeof(gr_complex);
         stop = false;
         message = 0;
+        gnss_synchro = {0};
     }
 
     ~GpsL1CaPcpsAcquisitionTest()
diff --git a/src/tests/gnss_block/gps_l1_ca_pcps_multithread_acquisition_gsoc2013_test.cc b/src/tests/gnss_block/gps_l1_ca_pcps_multithread_acquisition_gsoc2013_test.cc
index b2d60a4fc..2bd17099e 100644
--- a/src/tests/gnss_block/gps_l1_ca_pcps_multithread_acquisition_gsoc2013_test.cc
+++ b/src/tests/gnss_block/gps_l1_ca_pcps_multithread_acquisition_gsoc2013_test.cc
@@ -66,6 +66,7 @@ protected:
         item_size = sizeof(gr_complex);
         stop = false;
         message = 0;
+        gnss_synchro = {0};
     }
 
     ~GpsL1CaPcpsMultithreadAcquisitionGSoC2013Test()
@@ -91,27 +92,27 @@ protected:
     int message;
     boost::thread ch_thread;
 
-    unsigned int integration_time_ms;
-    unsigned int fs_in;
+    unsigned int integration_time_ms = 0;
+    unsigned int fs_in = 0;
 
-    double expected_delay_chips;
-    double expected_doppler_hz;
-    float max_doppler_error_hz;
-    float max_delay_error_chips;
+    double expected_delay_chips = 0.0;
+    double expected_doppler_hz = 0.0;
+    float max_doppler_error_hz = 0.0;
+    float max_delay_error_chips = 0.0;
 
-    unsigned int num_of_realizations;
-    unsigned int realization_counter;
-    unsigned int detection_counter;
-    unsigned int correct_estimation_counter;
-    unsigned int acquired_samples;
-    unsigned int mean_acq_time_us;
+    unsigned int num_of_realizations = 0;
+    unsigned int realization_counter = 0;
+    unsigned int detection_counter = 0;
+    unsigned int correct_estimation_counter = 0;
+    unsigned int acquired_samples = 0;
+    unsigned int mean_acq_time_us = 0;
 
-    double mse_doppler;
-    double mse_delay;
+    double mse_doppler = 0.0;
+    double mse_delay = 0.0;
 
-    double Pd;
-    double Pfa_p;
-    double Pfa_a;
+    double Pd = 0.0;
+    double Pfa_p = 0.0;
+    double Pfa_a = 0.0;
 };
 
 void GpsL1CaPcpsMultithreadAcquisitionGSoC2013Test::init()
diff --git a/src/tests/gnss_block/gps_l1_ca_pcps_opencl_acquisition_gsoc2013_test.cc b/src/tests/gnss_block/gps_l1_ca_pcps_opencl_acquisition_gsoc2013_test.cc
index c8294a86b..5a15cc369 100644
--- a/src/tests/gnss_block/gps_l1_ca_pcps_opencl_acquisition_gsoc2013_test.cc
+++ b/src/tests/gnss_block/gps_l1_ca_pcps_opencl_acquisition_gsoc2013_test.cc
@@ -62,6 +62,7 @@ protected:
         item_size = sizeof(gr_complex);
         stop = false;
         message = 0;
+        gnss_synchro = {0};
     }
 
     ~GpsL1CaPcpsOpenClAcquisitionGSoC2013Test()
diff --git a/src/tests/gnss_block/gps_l1_ca_pcps_quicksync_acquisition_gsoc2014_test.cc b/src/tests/gnss_block/gps_l1_ca_pcps_quicksync_acquisition_gsoc2014_test.cc
index 859bacf9e..e4bb8ae52 100644
--- a/src/tests/gnss_block/gps_l1_ca_pcps_quicksync_acquisition_gsoc2014_test.cc
+++ b/src/tests/gnss_block/gps_l1_ca_pcps_quicksync_acquisition_gsoc2014_test.cc
@@ -66,6 +66,7 @@ protected:
         item_size = sizeof(gr_complex);
         stop = false;
         message = 0;
+        gnss_synchro = {0};
 }
 
     ~GpsL1CaPcpsQuickSyncAcquisitionGSoC2014Test()
@@ -92,33 +93,33 @@ protected:
     int message;
     boost::thread ch_thread;
 
-    unsigned int integration_time_ms;
-    unsigned int fs_in;
-    unsigned int folding_factor;
+    unsigned int integration_time_ms = 0;
+    unsigned int fs_in = 0;
+    unsigned int folding_factor = 0;
 
-    double expected_delay_chips;
-    double expected_doppler_hz;
-    float max_doppler_error_hz;
-    float max_delay_error_chips;
+    double expected_delay_chips = 0.0;
+    double expected_doppler_hz = 0.0;
+    float max_doppler_error_hz = 0.0;
+    float max_delay_error_chips = 0.0;
 
-    unsigned int num_of_realizations;
-    unsigned int realization_counter;
-    unsigned int detection_counter;
-    unsigned int correct_estimation_counter;
-    unsigned int acquired_samples;
-    unsigned int mean_acq_time_us;
+    unsigned int num_of_realizations = 0;
+    unsigned int realization_counter = 0;
+    unsigned int detection_counter = 0;
+    unsigned int correct_estimation_counter = 0;
+    unsigned int acquired_samples = 0;
+    unsigned int mean_acq_time_us = 0;
 
-    double mse_doppler;
-    double mse_delay;
+    double mse_doppler = 0.0;
+    double mse_delay = 0.0;
 
-    double Pd;
-    double Pfa_p;
-    double Pfa_a;
-    double Pmd;
+    double Pd = 0.0;
+    double Pfa_p = 0.0;
+    double Pfa_a = 0.0;
+    double Pmd = 0.0;
 
     std::ofstream pdpfafile;
-    unsigned int miss_detection_counter;
-    bool dump_test_results;
+    unsigned int miss_detection_counter = 0;
+    bool dump_test_results = false;
 };
 
 
diff --git a/src/tests/gnss_block/gps_l1_ca_pcps_tong_acquisition_gsoc2013_test.cc b/src/tests/gnss_block/gps_l1_ca_pcps_tong_acquisition_gsoc2013_test.cc
index 55ea5a64b..ca7d46276 100644
--- a/src/tests/gnss_block/gps_l1_ca_pcps_tong_acquisition_gsoc2013_test.cc
+++ b/src/tests/gnss_block/gps_l1_ca_pcps_tong_acquisition_gsoc2013_test.cc
@@ -63,6 +63,7 @@ protected:
         item_size = sizeof(gr_complex);
         stop = false;
         message = 0;
+        gnss_synchro = {0};
     }
 
     ~GpsL1CaPcpsTongAcquisitionGSoC2013Test()
diff --git a/src/tests/gnss_block/gps_l2_m_dll_pll_tracking_test.cc b/src/tests/gnss_block/gps_l2_m_dll_pll_tracking_test.cc
index 3ff9709de..18b134044 100644
--- a/src/tests/gnss_block/gps_l2_m_dll_pll_tracking_test.cc
+++ b/src/tests/gnss_block/gps_l2_m_dll_pll_tracking_test.cc
@@ -60,6 +60,7 @@ protected:
         item_size = sizeof(gr_complex);
         stop = false;
         message = 0;
+        gnss_synchro = {0};
     }
 
     ~GpsL2MDllPllTrackingTest()
diff --git a/src/tests/gnss_block/gps_l2_m_pcps_acquisition_test.cc b/src/tests/gnss_block/gps_l2_m_pcps_acquisition_test.cc
index 92579b056..ef5c2df2f 100644
--- a/src/tests/gnss_block/gps_l2_m_pcps_acquisition_test.cc
+++ b/src/tests/gnss_block/gps_l2_m_pcps_acquisition_test.cc
@@ -67,7 +67,8 @@ protected:
         stop = false;
         message = 0;
         sampling_freqeuncy_hz = 0;
-        nsamples=0;
+        nsamples = 0;
+        gnss_synchro = {0};
     }
 
     ~GpsL2MPcpsAcquisitionTest()