diff --git a/src/core/receiver/gnss_block_factory.cc b/src/core/receiver/gnss_block_factory.cc
index 70b3da80a..f5b37722d 100644
--- a/src/core/receiver/gnss_block_factory.cc
+++ b/src/core/receiver/gnss_block_factory.cc
@@ -41,6 +41,7 @@
 #include <boost/lexical_cast.hpp>
 #include <glog/logging.h>
 #include "configuration_interface.h"
+#include "in_memory_configuration.h"
 #include "gnss_block_interface.h"
 #include "pass_through.h"
 #include "file_signal_source.h"
@@ -285,8 +286,19 @@ std::unique_ptr<GNSSBlockInterface> GNSSBlockFactory::GetChannel_1C(
         {
             appendix3 = ""; 
         }
+    // Automatically detect input data type
+    std::shared_ptr<InMemoryConfiguration> config;
+    config = std::make_shared<InMemoryConfiguration>();
+    std::string default_item_type = "gr_complex";
+    std::string acq_item_type = configuration->property("Acquisition_1C" + appendix1 + ".item_type", default_item_type);
+    std::string trk_item_type = configuration->property("Tracking_1C" + appendix2 + ".item_type", default_item_type);
+    if(acq_item_type.compare(trk_item_type))
+        {
+            LOG(ERROR) << "Acquisition and Tracking blocks must have the same input data type!";
+        }
+    config->set_property("Channel.item_type", acq_item_type);
 
-    std::unique_ptr<GNSSBlockInterface> pass_through_ = GetBlock(configuration, "Channel", "Pass_Through", 1, 1, queue);
+    std::unique_ptr<GNSSBlockInterface> pass_through_ = GetBlock(config, "Channel", "Pass_Through", 1, 1, queue);
     std::unique_ptr<AcquisitionInterface> acq_ = GetAcqBlock(configuration, "Acquisition_1C" + appendix1, acq, 1, 0);
     std::unique_ptr<TrackingInterface> trk_ = GetTrkBlock(configuration, "Tracking_1C"+ appendix2, trk, 1, 1);
     std::unique_ptr<TelemetryDecoderInterface> tlm_ = GetTlmBlock(configuration, "TelemetryDecoder_1C" + appendix3, tlm, 1, 1);
@@ -339,6 +351,17 @@ std::unique_ptr<GNSSBlockInterface> GNSSBlockFactory::GetChannel_2S(
         {
             appendix3 = ""; 
         }
+    // Automatically detect input data type
+    std::shared_ptr<InMemoryConfiguration> config;
+    config = std::make_shared<InMemoryConfiguration>();
+    std::string default_item_type = "gr_complex";
+    std::string acq_item_type = configuration->property("Acquisition_2S" + appendix1 + ".item_type", default_item_type);
+    std::string trk_item_type = configuration->property("Tracking_2S" + appendix2 + ".item_type", default_item_type);
+    if(acq_item_type.compare(trk_item_type))
+        {
+            LOG(ERROR) << "Acquisition and Tracking blocks must have the same input data type!";
+        }
+    config->set_property("Channel.item_type", acq_item_type);
 
     std::unique_ptr<GNSSBlockInterface> pass_through_ = GetBlock(configuration, "Channel", "Pass_Through", 1, 1, queue);
     std::unique_ptr<AcquisitionInterface> acq_ = GetAcqBlock(configuration, "Acquisition_2S" + appendix1 , acq, 1, 0);
@@ -395,6 +418,17 @@ std::unique_ptr<GNSSBlockInterface> GNSSBlockFactory::GetChannel_1B(
         {
             appendix3 = ""; 
         }
+    // Automatically detect input data type
+    std::shared_ptr<InMemoryConfiguration> config;
+    config = std::make_shared<InMemoryConfiguration>();
+    std::string default_item_type = "gr_complex";
+    std::string acq_item_type = configuration->property("Acquisition_1B" + appendix1 + ".item_type", default_item_type);
+    std::string trk_item_type = configuration->property("Tracking_1B" + appendix2 + ".item_type", default_item_type);
+    if(acq_item_type.compare(trk_item_type))
+        {
+            LOG(ERROR) << "Acquisition and Tracking blocks must have the same input data type!";
+        }
+    config->set_property("Channel.item_type", acq_item_type);
 
     std::unique_ptr<GNSSBlockInterface> pass_through_ = GetBlock(configuration, "Channel", "Pass_Through", 1, 1, queue);
     std::unique_ptr<AcquisitionInterface> acq_ = GetAcqBlock(configuration, "Acquisition_1B" + appendix1, acq, 1, 0);
@@ -451,6 +485,17 @@ std::unique_ptr<GNSSBlockInterface> GNSSBlockFactory::GetChannel_5X(
         {
             appendix3 = ""; 
         }
+    // Automatically detect input data type
+    std::shared_ptr<InMemoryConfiguration> config;
+    config = std::make_shared<InMemoryConfiguration>();
+    std::string default_item_type = "gr_complex";
+    std::string acq_item_type = configuration->property("Acquisition_5X" + appendix1 + ".item_type", default_item_type);
+    std::string trk_item_type = configuration->property("Tracking_5X" + appendix2 + ".item_type", default_item_type);
+    if(acq_item_type.compare(trk_item_type))
+        {
+            LOG(ERROR) << "Acquisition and Tracking blocks must have the same input data type!";
+        }
+    config->set_property("Channel.item_type", acq_item_type);
 
     std::unique_ptr<GNSSBlockInterface> pass_through_ = GetBlock(configuration, "Channel", "Pass_Through", 1, 1, queue);
     std::unique_ptr<AcquisitionInterface> acq_ = GetAcqBlock(configuration, "Acquisition_5X" + appendix1, acq, 1, 0);