diff --git a/conf/front-end-cal.conf b/conf/front-end-cal.conf
index af9221936..8b09a2065 100644
--- a/conf/front-end-cal.conf
+++ b/conf/front-end-cal.conf
@@ -41,17 +41,10 @@ GNSS-SDR.SUPL_LAC=861
 GNSS-SDR.SUPL_CI=40184
 
 ;######### SIGNAL_SOURCE CONFIG ############
-;#implementation: Use [File_Signal_Source] or [UHD_Signal_Source] or [GN3S_Signal_Source] or [Osmosdr_Signal_Source]
 SignalSource.implementation=Osmosdr_Signal_Source
 
-SignalSource.AGC_enabled=false
-
-;#filename: path to file with the captured GNSS signal samples to be processed
-;SignalSource.filename=/datalogger/signals/RTL-SDR/cap_-90dBm_IF15_RF40_EzCap.dat
-SignalSource.filename=/datalogger/signals/Agilent/New York/2msps.dat
-;SignalSource.filename=/datalogger/signals/RTL-SDR/geo/pmt4_no_amp.dat
-;SignalSource.filename=/datalogger/signals/RTL-SDR/geo/pmt4_no_amp_mini.dat
-;SignalSource.filename=/datalogger/signals/RTL-SDR/mozoncillo/cap_mozon_ezcap.dat
+;#freq: RF front-end center frequency in [Hz] 
+SignalSource.freq=1575420000
 
 ;#item_type: Type and resolution for each of the signal samples. Use only gr_complex in this version.
 SignalSource.item_type=gr_complex
@@ -59,18 +52,26 @@ SignalSource.item_type=gr_complex
 ;#sampling_frequency: Original Signal sampling frequency in [Hz] 
 SignalSource.sampling_frequency=2000000
 
-;#freq: RF front-end center frequency in [Hz] 
-SignalSource.freq=1575420000
-
 ;#gain: Front-end Gain in [dB] 
 SignalSource.gain=40 
 SignalSource.rf_gain=40
 SignalSource.if_gain=30
+SignalSource.AGC_enabled=false
 
-;#subdevice: UHD subdevice specification (for USRP1 use A:0 or B:0)
-SignalSource.subdevice=B:0
+;# Please note that the new RTL-SDR Blog V3 dongles ship a < 1 PPM 
+;# temperature compensated oscillator (TCXO), which is well suited for GNSS
+;# signal processing, and a 4.5 V powered bias-tee to feed an active antenna.
+;# Whether the bias-tee is turned off before reception depends on which version 
+;# of gr-osmosdr was used when compiling GNSS-SDR. With an old version 
+;# (for example, v0.1.4-8), the utility rtl_biast may be used to switch the 
+;# bias-tee, and then call gnss-sdr.  
+;# See https://github.com/rtlsdrblog/rtl_biast
+;# After reception the bias-tee is switched off automatically by the program.
+;# With newer versions of gr-osmosdr (>= 0.1.4-13), the bias-tee can be 
+;# activated by uncommenting the following line:
+;SignalSource.osmosdr_args=rtl,bias=1
 
-;#samples: Number of samples to be processed. Notice that 0 indicates the entire file.
+;#samples: Number of samples to be processed. Notice that 0 means infinite samples.
 SignalSource.samples=0
 
 ;#repeat: Repeat the processing file.
diff --git a/conf/gnss-sdr_GPS_L1_rtlsdr_realtime.conf b/conf/gnss-sdr_GPS_L1_rtlsdr_realtime.conf
index 8c5f9022a..2c10ea684 100644
--- a/conf/gnss-sdr_GPS_L1_rtlsdr_realtime.conf
+++ b/conf/gnss-sdr_GPS_L1_rtlsdr_realtime.conf
@@ -27,9 +27,8 @@ GNSS-SDR.SUPL_CI=0x31b0
 
 ;######### SIGNAL_SOURCE CONFIG ############
 SignalSource.implementation=Osmosdr_Signal_Source
-;SignalSource.filename=/media/DATALOGGER_/signals/RTL-SDR/geo/pmt4.dat
 SignalSource.item_type=gr_complex
-;FOR USE GNSS-SDR WITH RTLSDR DONGLES USER MUST SET THE CALIBRATED SAMPLE RATE HERE
+; FOR USE GNSS-SDR WITH RTLSDR DONGLES USER MUST SET THE CALIBRATED SAMPLE RATE HERE
 ; i.e. using front-end-cal as reported here:http://www.cttc.es/publication/turning-a-television-into-a-gnss-receiver/
 SignalSource.sampling_frequency=2000000
 SignalSource.freq=1575420000
@@ -43,6 +42,19 @@ SignalSource.dump=false
 SignalSource.dump_filename=../data/signal_source.dat
 SignalSource.enable_throttle_control=false
 
+;# Please note that the new RTL-SDR Blog V3 dongles ship a < 1 PPM 
+;# temperature compensated oscillator (TCXO), which is well suited for GNSS
+;# signal processing, and a 4.5 V powered bias-tee to feed an active antenna.
+;# Whether the bias-tee is turned off before reception depends on which version 
+;# of gr-osmosdr was used when compiling GNSS-SDR. With an old version 
+;# (for example, v0.1.4-8), the utility rtl_biast may be used to switch the 
+;# bias-tee, and then call gnss-sdr.  
+;# See https://github.com/rtlsdrblog/rtl_biast
+;# After reception the bias-tee is switched off automatically by the program.
+;# With newer versions of gr-osmosdr (>= 0.1.4-13), the bias-tee can be 
+;# activated by uncommenting the following line:
+;SignalSource.osmosdr_args=rtl,bias=1
+
 ;######### SIGNAL_CONDITIONER CONFIG ############
 SignalConditioner.implementation=Signal_Conditioner