diff --git a/src/algorithms/signal_source/adapters/flexiband_signal_source.cc b/src/algorithms/signal_source/adapters/flexiband_signal_source.cc
index 598bb4640..ff3f3f9a0 100644
--- a/src/algorithms/signal_source/adapters/flexiband_signal_source.cc
+++ b/src/algorithms/signal_source/adapters/flexiband_signal_source.cc
@@ -65,22 +65,31 @@ FlexibandSignalSource::FlexibandSignalSource(ConfigurationInterface* configurati
 
     usb_packet_buffer_size_ = configuration->property(role + ".usb_packet_buffer", 128);
 
-    RF_channels_ = configuration->property(role + ".RF_channels", 1);
-
+    n_channels_ = configuration->property(role + ".total_channels", 0);
+    if (n_channels_ == 0)
+        {
+            n_channels_ = configuration->property(role + ".RF_channels", 1);
+        }
+    sel_ch_ = configuration->property(role + ".sel_ch", 1);
+    if (sel_ch_ > n_channels_)
+        {
+            LOG(WARNING) << "Invalid RF channel selection";
+        }
     if (item_type_ == "gr_complex")
         {
             item_size_ = sizeof(gr_complex);
             flexiband_source_ = gr::teleorbit::frontend::make(firmware_filename_.c_str(), gain1_, gain2_, gain3_, AGC_, usb_packet_buffer_size_, signal_file.c_str(), flag_read_file);
 
             //create I, Q -> gr_complex type conversion blocks
-            for (int n = 0; n < (RF_channels_ * 2); n++)
+            for (int n = 0; n < (n_channels_ * 2); n++)
                 {
                     char_to_float.push_back(gr::blocks::char_to_float::make());
                 }
 
-            for (int n = 0; n < RF_channels_; n++)
+            for (int n = 0; n < n_channels_; n++)
                 {
                     float_to_complex_.push_back(gr::blocks::float_to_complex::make());
+                    null_sinks_.push_back(gr::blocks::null_sink::make(sizeof(gr_complex)));
                 }
 
             DLOG(INFO) << "Item size " << item_size_;
@@ -108,15 +117,16 @@ FlexibandSignalSource::~FlexibandSignalSource() = default;
 
 void FlexibandSignalSource::connect(gr::top_block_sptr top_block)
 {
-    for (int n = 0; n < (RF_channels_ * 2); n++)
+    for (int n = 0; n < (n_channels_ * 2); n++)
         {
             top_block->connect(flexiband_source_, n, char_to_float.at(n), 0);
             DLOG(INFO) << "connected flexiband_source_ to char_to_float CH" << n;
         }
-    for (int n = 0; n < RF_channels_; n++)
+    for (int n = 0; n < n_channels_; n++)
         {
             top_block->connect(char_to_float.at(n * 2), 0, float_to_complex_.at(n), 0);
             top_block->connect(char_to_float.at(n * 2 + 1), 0, float_to_complex_.at(n), 1);
+            top_block->connect(float_to_complex_.at(n), 0, null_sinks_.at(n), 0);
             DLOG(INFO) << "connected char_to_float to float_to_complex_ CH" << n;
         }
 }
@@ -124,15 +134,16 @@ void FlexibandSignalSource::connect(gr::top_block_sptr top_block)
 
 void FlexibandSignalSource::disconnect(gr::top_block_sptr top_block)
 {
-    for (int n = 0; n < (RF_channels_ * 2); n++)
+    for (int n = 0; n < (n_channels_ * 2); n++)
         {
             top_block->disconnect(flexiband_source_, n, char_to_float.at(n), 0);
             DLOG(INFO) << "disconnect flexiband_source_ to char_to_float CH" << n;
         }
-    for (int n = 0; n < RF_channels_; n++)
+    for (int n = 0; n < n_channels_; n++)
         {
             top_block->disconnect(char_to_float.at(n * 2), 0, float_to_complex_.at(n), 0);
             top_block->disconnect(char_to_float.at(n * 2 + 1), 0, float_to_complex_.at(n), 1);
+            top_block->disconnect(float_to_complex_.at(n), 0, null_sinks_.at(n), 0);
             DLOG(INFO) << "disconnect char_to_float to float_to_complex_ CH" << n;
         }
 }
@@ -152,5 +163,14 @@ gr::basic_block_sptr FlexibandSignalSource::get_right_block()
 
 gr::basic_block_sptr FlexibandSignalSource::get_right_block(int RF_channel)
 {
-    return float_to_complex_.at(RF_channel);
+    if (RF_channel == 0)
+        {
+            //in the first RF channel, return the signalsource selected channel.
+            //this trick enables the use of the second or the third frequency of a FlexiBand signal without a dual frequency configuration
+            return float_to_complex_.at(sel_ch_ - 1);
+        }
+    else
+        {
+            return float_to_complex_.at(RF_channel);
+        }
 }
diff --git a/src/algorithms/signal_source/adapters/flexiband_signal_source.h b/src/algorithms/signal_source/adapters/flexiband_signal_source.h
index 40030af6c..7da5839a8 100644
--- a/src/algorithms/signal_source/adapters/flexiband_signal_source.h
+++ b/src/algorithms/signal_source/adapters/flexiband_signal_source.h
@@ -38,6 +38,7 @@
 #include <gnuradio/blocks/char_to_float.h>
 #include <gnuradio/blocks/file_sink.h>
 #include <gnuradio/blocks/float_to_complex.h>
+#include <gnuradio/blocks/null_sink.h>
 #include <gnuradio/hier_block2.h>
 #include <gnuradio/msg_queue.h>
 #include <string>
@@ -99,12 +100,14 @@ private:
     std::string signal_file;
     bool flag_read_file;
 
-    int RF_channels_;
+    int n_channels_;
+    int sel_ch_;
 
     gr::block_sptr flexiband_source_;
 
     std::vector<boost::shared_ptr<gr::block>> char_to_float;
     std::vector<boost::shared_ptr<gr::block>> float_to_complex_;
+    std::vector<gr::blocks::null_sink::sptr> null_sinks_;
 
     boost::shared_ptr<gr::msg_queue> queue_;
 };
diff --git a/src/core/receiver/gnss_flowgraph.cc b/src/core/receiver/gnss_flowgraph.cc
index 95ea7df45..38563aeed 100644
--- a/src/core/receiver/gnss_flowgraph.cc
+++ b/src/core/receiver/gnss_flowgraph.cc
@@ -363,6 +363,11 @@ void GNSSFlowgraph::connect()
 #endif
 
     // Signal conditioner (selected_signal_source) >> channels (i) (dependent of their associated SignalSource_ID)
+    std::vector<bool> signal_conditioner_connected;
+    for (size_t n = 0; n < sig_conditioner_.size(); n++)
+        {
+            signal_conditioner_connected.push_back(false);
+        }
     for (unsigned int i = 0; i < channels_count_; i++)
         {
 #ifndef ENABLE_FPGA
@@ -500,10 +505,12 @@ void GNSSFlowgraph::connect()
                             top_block_->disconnect_all();
                             return;
                         }
-
+                    signal_conditioner_connected.at(selected_signal_conditioner_ID) = true;  //notify that this signal conditioner is connected
                     DLOG(INFO) << "signal conditioner " << selected_signal_conditioner_ID << " connected to channel " << i;
                 }
 #endif
+
+
             // Signal Source > Signal conditioner >> Channels >> Observables
             try
                 {
@@ -519,6 +526,20 @@ void GNSSFlowgraph::connect()
                 }
         }
 
+    //check for unconnected signal conditioners and connect null_sinks in order to provide configuration flexibility to multiband files or signal sources
+    if (configuration_->property(sig_source_.at(0)->role() + ".enable_FPGA", false) == false)
+        {
+            for (size_t n = 0; n < sig_conditioner_.size(); n++)
+                {
+                    if (signal_conditioner_connected.at(n) == false)
+                        {
+                            null_sinks_.push_back(gr::blocks::null_sink::make(sizeof(gr_complex)));
+                            top_block_->connect(sig_conditioner_.at(n)->get_right_block(), 0,
+                                null_sinks_.back(), 0);
+                            LOG(INFO) << "Null sink connected to signal conditioner " << n << " due to lack of connection to any channel" << std::endl;
+                        }
+                }
+        }
     // Put channels fixed to a given satellite at the beginning of the vector, then the rest
     std::vector<unsigned int> vector_of_channels;
     for (unsigned int i = 0; i < channels_count_; i++)
diff --git a/src/core/receiver/gnss_flowgraph.h b/src/core/receiver/gnss_flowgraph.h
index 189f34dca..32e0ea2e3 100644
--- a/src/core/receiver/gnss_flowgraph.h
+++ b/src/core/receiver/gnss_flowgraph.h
@@ -40,16 +40,17 @@
 #include "gnss_sdr_sample_counter.h"
 #include "gnss_signal.h"
 #include "pvt_interface.h"
-#include <gnuradio/msg_queue.h>      // for msg_queue, msg_queue::sptr
-#include <gnuradio/runtime_types.h>  // for basic_block_sptr, top_block_sptr
-#include <pmt/pmt.h>                 // for pmt_t
-#include <list>                      // for list
-#include <map>                       // for map
-#include <memory>                    // for for shared_ptr, dynamic_pointer_cast
-#include <mutex>                     // for mutex
-#include <string>                    // for string
-#include <utility>                   // for pair
-#include <vector>                    // for vector
+#include <gnuradio/blocks/null_sink.h>  //for null_sink
+#include <gnuradio/msg_queue.h>         // for msg_queue, msg_queue::sptr
+#include <gnuradio/runtime_types.h>     // for basic_block_sptr, top_block_sptr
+#include <pmt/pmt.h>                    // for pmt_t
+#include <list>                         // for list
+#include <map>                          // for map
+#include <memory>                       // for for shared_ptr, dynamic_pointer_cast
+#include <mutex>                        // for mutex
+#include <string>                       // for string
+#include <utility>                      // for pair
+#include <vector>                       // for vector
 #if ENABLE_FPGA
 #include "gnss_sdr_fpga_sample_counter.h"
 #endif
@@ -162,6 +163,7 @@ private:
 
     std::vector<std::shared_ptr<GNSSBlockInterface>> sig_source_;
     std::vector<std::shared_ptr<GNSSBlockInterface>> sig_conditioner_;
+    std::vector<gr::blocks::null_sink::sptr> null_sinks_;
 
     std::shared_ptr<GNSSBlockInterface> observables_;
     std::shared_ptr<GNSSBlockInterface> pvt_;