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Add a note explaining how to activate the bias-tee in a RTL-SDR Blog V3 

dongle, so it can feed an active antenna (see #77)

The activation is done by adding 

SignalSource.osmosdr_args=rtl,bias=1

to the configuration file, if using gr-osmosdr >= 0.1.4-13 

For older versions of gr-osmosdr, you can use
https://github.com/rtlsdrblog/rtl_biast
This commit is contained in:
Carles Fernandez 2018-01-18 15:49:05 +01:00
parent dc717db61e
commit 4bbd994f60
2 changed files with 30 additions and 17 deletions
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31
conf/front-end-cal.conf
View File

@ -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.

16
conf/gnss-sdr_GPS_L1_rtlsdr_realtime.conf
View File

@ -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