Creating a 2m Fm Repeater with a Raspberry Pi (B) and a RTL dongle.

Creating a 2m Fm Repeater with a Raspberry Pi (B) and a RTL dongle. (Don't use this application without the RF filter)

RTL dongles is available from Giga Technology and the filter will be available soon.

For the purpose of this configuration I expect your Raspberry pi to be connected to the internet.

How will this repeater work.

This configuration was done with the latest Raspbian Os for Raspberry Pi downloaded from here https://www.raspberrypi.org/downloads/

I used my original Raspberry Pi B+ and also repeated  this on a Banana Pi

 as I need a hard drive to compile gnuradio for later SDR use.

I will be using a rtl dongle to receive my input signal on 70cm frequency configurable on the amateur 2m or 70cm band. The receiver signal will then be demodulated and re transmitted with a DSP Library simulating a FM Signal using a GPIO pin on the Raspberry as an transmitter.

Get your Raspberry Pi on the latest patch/update.

sudo apt-get update

sudo apt-get upgrade

Go and get some Coffee as it might take long time to update ..zzz...... ;-) 

Install the SDR command line application to access rtl  USB dongle.

This rtl library allow you to demodulate the fm / ssb input

sudo apt-get install rtl-sdr-0.5.3-3 mplayer octave gnuplot gnuplot-x11

Download the Fm transmitter software from github using the following command

Install the rpitx python library using the following command. 

rpitx is the main software to transmit. It allows to transmit from:

• IQ files *.iq (can be generated by external software like GNU Radio).
• Frequency/Time files *.ft (generally used to easily implement digital modes)

Installation of rpitx

git clone https://github.com/F5OEO/rpitx git clone https://github.com/F5OEO/rpitx

cd rpitx # make sure to have access to the internet to download packages # or download and install them manually (libsndfile1-dev and imagemagick) 

./install.sh

Ok lets create some IQ files that will be used  to test the transmitter.

SSB Transmiiter

./pissb sampleaudio.wav ssbIQ.wav


A sample script testssb.sh is included.

FM modulation

pifm converts an audio file (Wav, 48KHz, 1 channel, pcm_s16le codec) to Narrow band FM (12.5khz excursion) and outputs it to a .ft file. Assuming your audio file is in your current working directory ./pifm sampleaudio.wav fm.ft

Connect a antenna to pin 4  long wire 40cm or longer depending on 1/4 lent of wavelength.

Pin Connection Diagram. Use coaxial cable to make connection

Here is a link with the filter details for the 2m Band

You could then transmit it on 100MHZ (please set a correct frequency to be legal) 

sudo ./rpitx -m RF -i fm.ft -f 100000 -l -c1


A sample script : testfm.sh is included.  add -c1 for pin 4 transmission in file

VFO
A VFO mode is provided to allows precise frequency resolution. For example to set a carrier on 100MHz (please set a correct frequency to be legal)sudo ./rpitx -m VFO -f 100000 -c1

Ok we got the Transmitter working Now lets get the rtl dongle working.
Follow my steps here http://zr6aic.blogspot.co.za/2013/02/setting-up-my-raspberry-pi-as-sdr-server.html

When you are complete with installation of rtl_sdr and have tested it wit rtl_test -t we can now check what audio devices the raspberry have.

sudo aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: ALSA [bcm2835 ALSA], device 0: bcm2835 ALSA [bcm2835 ALSA]
  Subdevices: 8/8
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
  Subdevice #4: subdevice #4
  Subdevice #5: subdevice #5
  Subdevice #6: subdevice #6
  Subdevice #7: subdevice #7
card 0: ALSA [bcm2835 ALSA], device 1: bcm2835 ALSA [bcm2835 IEC958/HDMI]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

Now we need to install some audio utility programs to pyp and convert audio signals

sudo apt-get install sox libsox-fmt-all

ok lets test to see if we can receive 2m band transmission.

Tune the the rtl dongle for a frequency of 145.500Mhz and transmit a test signal.

sudo rtl_fm -f 145500000 -M fm 

Transmit a mp3 file recording

sox -t mp3 zr6aic_CQ_mono.mp3 -t wav -r 48000 -c 1 - | sudo ./pifm - 145.5 -c1

Installing ffmpeg


# build and install x264

git clone --depth 1 git://git.videolan.org/x264 cd x264 

./configure --host=arm-unknown-linux-gnueabi --enable-static --disable-opencl 

make -j 4

sudo make install

 # build and make ffmpeg
git clone --depth=1 git://source.ffmpeg.org/ffmpeg.git cd ffmpeg
./configure --arch=armel --target-os=linux --enable-gpl --enable-libx264 --enable-nonfree
make -j4
sudo make install


Install the following utility classes to help with the audio manipulation
sudo apt-get install libav-tools sox oggfwd libsndfile1-dev
sudo apt-get install fftw3 libfftw3-dev

Install csdr
git clone https://github.com/simonyiszk/csdr.git 

cd csdr 

git fetch 

git checkout dev 

make && sudo make install

Testing transmitter with Audio file (pin4 = -c1)

(while true; do cat speech48000.raw; done) | csdr convert_i16_f | csdr gain_ff 700 | csdr convert_f_samplerf 20833 | sudo rpitx -i- -m RF -f 145000 -c1

Putting the rpitx transmitter in TCP port listening mode (replace ip with Raspberry pi ip)

Sending audio from remote computer. (using mike from Linux computer)

arecord -fS16_LE -r48000 -c1 - | nc 192.168.10.128 8011

Testing RTL_fm (replace ip with your Raspberry ip)
sudo rtl_fm -M wbfm -f 98000000 | play -t raw -r 24k -es -b 16 -c 1 -V1 -
sudo rtl_fm -M wbfm -f 98000000 |nc  192.168.10.128 8011 -

Send rtl_dongle to transmitter (replace with your raspnerry ip)

sudo rtl_sdr -s 250000 -f 144300000 -p 0 - | nc -vv 192.168.10.128 8011

sudo rtl_sdr -s 4800 -f 144300000 -p 0 - | nc -vv 192.168.10.128 8011
 

Working RX with rtl dongle
sudo nc -l 8011 | csdr convert_i16_f | csdr gain_ff 8000 | csdr convert_f_samplerf 20833 | sudo rpitx -i- -m RF -f 145300 -c1

Working TX with pin 4

sudo rtl_fm -s48000 -g 49.6 -l 0 -M fm -f 434400000 |nc  192.168.10.128 8011 -

here is repeater without sqaulse

How to make the Repeater to auto start when the Raspberry start boot up.

Create a file and edit it

sudo vi /etc/init.d/Repeater

Add the following in the file and save it

#! /bin/sh
# /home/pi/sh/run_repeater.sh

### BEGIN INIT INFO
# Provides:          SDR repater start script
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Simple script to start a program at boot
# Description:       A simple script from www.stuffaboutcode.com which will start / stop a program a boot / shutdown.
### END INIT INFO

# If you want a command to always run, put it here

# Carry out specific functions when asked to by the system
case "$1" in
  start)
    echo "Starting SDR_repeater"
    # run application you want to start
    /home/pi/sh/run_repeater.sh
    ;;
  stop)
    echo "Stopping SDR_Repeater"
    # kill application you want to stop
    killall rtl_fm
    killall rpitx
    ;;
  *)
    echo "Usage: /etc/init.d/Repeater {start|stop}"
    exit 1
    ;;

esac

Make the file executable

sudo chmod 755 /etc/init.d/Repeater

Create a file in the /home/pi/sh/run_repeater.sh
Vi /home/pi/sh/run_repeater.sh

Add the Repeater script define above in this file so that it can auto start on boot time.

sudo rtl_fm -p 38 -s48000 -g 0 -l 3 -M fm -f 434400000 |csdr convert_i16_f | csdr gain_ff 12000 | csdr convert_f_samplerf 20330 | sudo rpitx -i- -m RF -f 145293 -c1&

Test the start and stop script.

Start the Repeater
sudo /etc/init.d/Repeater start

Stop The Repeater
sudo /etc/init.d/Repeater stop

Here is a video of the Test of the repeater ( I have changed the wires with a coaxial cable)

Video testing Fm demod and re mod cross band

What else can I do

Creating APRS transmitter
Setting up APRX rpitx with Raspberry Pi

aprs --callsign <callsign> --output - "<message>" | csdr convert_i16_f | csdr gain_ff 7000 | csdr convert_f_samplerf 20833 | sudo rpitx -m RF -i - -f 144800 -c1

Repeater configured in a single line 
sudo rtl_fm -p 38 -s48000 -g 0 -l 0 -M fm -f 434400000 |csdr convert_i16_f | csdr gain_ff 12000 | csdr convert_f_samplerf 20330 | sudo rpitx -i- -m RF -f 145293 -c1

Specifications (measured with New Low pass filter board )

Here is some results of Power measurements at 145Mhz. (@50ohm) 

• Voltage  1.3V
• Power 32.7 mW  (15.1dBm)

Total power consumption on power supply when repeater is running

Measured  5.44 V  and  540mA  = Total watts   2.937Watts

SDR Comparison

SDR Comparison

Name	Type	Frequency range	Band with	Channel	Host Interface	Windows	Linux	Mac	Estimated price
AirSpy	Pre-build	24-1750 MHz	20 MSPS MSps ADC sampling, up to 80 MSPS	1	USB	Yes	Yes	Yes using ports	US$199
SDRstick UDPSDR-HF1	Pre-built	0.1–30 MHz	80 Msps	1	1G Ethernet via BeMicroCV-A9	Yes	Yes	Yes	US$169
Apache Labs ANAN-10E	Pre-built	10 kHz – 55 MHz	122.88 Msps (14 bit ADC)	2	Gigabit Ethernet	Yes	Yes	Yes	US$995
Apache Labs ANAN-10/100	Pre-built	10 kHz – 55 MHz	122.88 Msps (16 bit ADC)	4	Gigabit Ethernet	Yes	Yes	Yes	US$1,649-US$2,449
Apache Labs ANAN-100D/200D	Pre-built	10 kHz – 55 MHz	122.88 Msps (16 bit ADC)	7	Gigabit Ethernet	Yes	Yes	Yes	US$3,299-US$3,999
SunSDR2	Pre-built	10 kHz – 160 MHz	160 MSPS	3/4	10/100 Ethernet, WLAN (embedded)	Yes	Yes	?	US$1,960
bladeRF	Pre-built	300 MHz - 3.8 GHz	80 kSPS - 40 MSPS RX/TX (12-bit ADC/DAC)	?	USB 3.0 SuperSpeed	Yes	Yes	Yes	US$420
FLEX-6700	Pre-built	0.01–73, 135-165 MHz	245.76 MSPS (transceiver)	8/8	Ethernet	Yes	Yes	Yes	US$7,499
FLEX-6700R	Pre-built	0.01–73, 135-165 MHz	245.76 MSPS (receiver)	8/8	Ethernet	Yes	Yes	Yes	US$6,399
FLEX-6500	Pre-built	0.01–73 MHz	245.76 MSPS (transceiver)	4/4	Ethernet	Yes	Yes	Yes	US$4,299
FLEX-6300	Pre-built	0.01–54 MHz	122.88 MSPS (transceiver)	2/2	Ethernet	Yes	Yes	Yes	US$2,499
FLEX-5000A	Pre-built	0.01–65 MHz	48, 96, 192 kHz (transceiver)	2/2	1394a Firewire	Yes	No	No	US$2,800
FLEX-3000	Pre-built	0.01–65 MHz	48, 96 kHz (transceiver)	1/1	1394a Firewire	Yes	No	No	US$1,700
FLEX-1500	Pre-built	0.01–54 MHz	48 kHz (transceiver)	1/1	USB	Yes	No	No	US$650
Perseus	Pre-built	10 kHz – 40 MHz (87.5–108 MHz using FM down-converter)	80 MSPS	?	USB	Yes	Yes	?	US$1,199
SDRplay: Radio Spectrum Processor	Pre-built	0.1–2,000 MHz	0.5-12 MS/s and up to 8 MHz bandwidth	0/1	USB	Yes	Yes	Yes	US$149
ISDB-T 2035/2037	Pre-built	50–960 MHz	0.5-12 MS/s and up to 8 MHz bandwidth	0/1	USB	Yes	Yes	Yes	US$25
Soft66AD / Soft66ADD / Soft66LC4 / Soft66RTL	Pre-built	0.5–70 MHz	External ADC required (I/Q output)	0/1	USB	Yes	Unofficially	?	US$20
FUNcube Dongle	Pre-built	64–1700 MHz	96 kHz	0/1	USB	Yes	Yes	Yes	US$160
FUNcube Dongle Pro+	Pre-built	0.15–240 MHz, 420-1900 MHz	192 kHz	0/1	USB	Yes	Yes	Yes	US$200
FiFi-SDR	Pre-built	200 kHz – 30 MHz	96 kHz (integrated soundcard)	0/1	USB	Yes	Yes	?	€120
SDR-IQ	PnP	0.1 kHz – 30 MHz	66.666 MHz	1/1 ?	USB	Yes	Yes	Yes	US$525
WinRadio WR-G31DCC	Pre-built	9 kHz – 50 MHz	100 MSPS	3/3	USB	Yes	No	No	US$950
USRP B200	Pre-built	70 MHz to 6 GHz	56 Msps	?	USB 3.0	Yes	Yes	Yes	US$675
USRP B210	Pre-built	70 MHz to 6 GHz	56 Msps	?	USB 3.0	Yes	Yes	Yes	US$1,100
USRP N200	Pre-built	DC to 6 GHz	25 Msps for 16-bit samples; 50 Msps for 8-bit samples	?	Gigabit Ethernet	Yes	Yes	Yes	US$1,515
USRP N210	Pre-built	DC to 6 GHz	25 Msps for 16-bit samples; 50 Msps for 8-bit samples	?	Gigabit Ethernet	Yes	Yes	Yes	US$1,717
USRP X300	Pre-built	DC to 6 GHz	200 Msps	?	Gigabit Ethernet, 10 Gigabit Ethernet, PCIe	Yes	Yes	Yes	US$3,900
USRP X310	Pre-built	DC to 6 GHz	200 Msps	?	Gigabit Ethernet, 10 Gigabit Ethernet, PCIe	Yes	Yes	Yes	US$4,800
Cross Country Wireless SDR receiver v. 3	Pre-built	472–479 kHz, 7.0–7.3 MHz/10.10–10.15 MHz, and 14.00–14.35 MHz	External ADC required (I/Q output)	1/1	Crystal controlled two channels	Yes	Yes	Yes	US$80
Realtek RTL2832U DVB-T tuner	Pre-built with custom driver	24–1766 MHz (R820T tuner) (sensitivity drops off considerably outside this range, but can go 0–2,200 MHz (E4000 tuner with direct sampling mod))	2.4 MHz (can go up to 3.2 MHz but drops samples)	?	USB	Yes	Yes	Yes	US$8 - US$10
SoftRock-40	Kit	7.5 MHz	48 kHz	1	USB	Yes	Yes	Yes	US$21
SoftRock RX Ensemble II	Kit	180 kHz – 3.0 MHz, and 1.8–30 MHz operation	External ADC required (I/Q output)	1	USB	Yes	Yes	Yes	US$67
ZS-1	Pre-built	300 kHz – 30 MHz	10 kHz, 20 kHz, 40 kHz, 100 kHz	3	USB 2.0	Yes	No	No	€1,399
HackRF One	Pre-built	1 MHz - 6 GHz	8 Msps - 20 Msps	1	USB 2.0	Yes	Yes	Yes	US$299
HiQSDR	prebuilt modules & kits, pcbs	30 kHz - 62 MHz	48 - 960 kHz	?	10/100 Ethernet	Yes	Yes	No	US$650 US$1,400
KiwiSDR	Pre-built	0.1 - 30Mhz	30Mhz	4	Beagle black	yes	yes	yes	USD 99
LimeSDR	Pre-built (full Open Source / Hardware)	100 kHz to 3.8 GHz	61.44 Msps (12 bit ADC)	?	USB 3.0, PCIe	Yes	Yes	Yes	US$299(USB) US$799(PCIe)

How to install Gqrx SDR software on Linux using your RTL dongle or Softrock receivers.

How to install the Gqrx SDR software on Linux using your RTL dongle or Softrock receivers. (Ubuntu)

RTL _dongle

The RTL Dongles is available from http://www.giga.co.za/ocart/index.php?route=product/category&path=59_63

Gqrx SDR software

Update the repository files and update your Linux to the latest versions.
sudo apt-get update
sudo apt-get upgrade

Now install the libraries ... get coffee
Now install the libraries for GQRX SDR on you Linux (Ubuntu)

sudo apt-get install cmake python-cheetah doxygen libboost-all-dev python-sphinx libfftw3-dev python-numpy libqwt-dev libgsl0-dev python-wxgtk2.6 qtcreator libpulse-dev swig libcppunit-dev libusb++-dev libusb-dev libusb-1.0-0-dev maybe some more coffee ;-)

For Ubuntu 16.04 I had to add the following libraries
sudo apt-get install qtdeclarative5-dev libqt5svg5*

Build and Install GNU Radio libraries

Create a directory where you will install the SDR software in your favorite install directory.

mkdir gqrx

goto directory you created.

cd gqrx

get the gnuradio source code

git clone http://git.gnuradio.org/git/gnuradio.git
git clone https://github.com/gnuradio/gnuradio.git

if you are using the old git before 1.6 then use this command

git clone git://gnuradio.org/gnuradio
it looks like for Ubuntu 16.04 you need to use the following git clone
git clone --recursive http://git.gnuradio.org/git/gnuradio.git You should see Cloning into 'gnuradio'...

got to the newly created directory gnuradio when the cloning is done

cd gnuradio make a build directory mkdir build goto the build directory cd build Compile gnuradio cmake ../ if you get an error -- WARNING: Found a known bad version of Boost (v104601). Disabling.

Then run cmake -DENABLE_BAD_BOOST=True ../

This can take a couple of hours depending on the speed of you Linux server.

make Now install the newly compiled binaries into the required directories sudo make install Now load the the gnu drivers sudo ldconfig

Build and Install RTL-SDR drivers
go to your favorite install directory
cd ../../../ get the latest source code from osmocom.org git clone git://git.osmocom.org/rtl-sdr.git go to the newly created directory cd rtl-sdr/ Now compile the rtl drivers create the build directory mkdir build go to the build directory cd build compile the code cmake ../ make now install the compiled binaries sudo make install load the drivers sudo ldconfig

now copy the content of the file rtl-sdr.rules and append it to the /etc/udev/rules.d/70-persistent-cd.rules file

use your favorite editor

vi rtl-sdr.rules  and copy the content.

then open the file /etc/udev/rules.d/70-persistent-cd.rules

sudo vi /etc/udev/rules.d/70-persistent-cd.rules and append the previous files content at the end
in ubuntu 16.04 the file name was /etc/udev/rules.d/rtl-sdr.rules

This is how my file looked like

# This file maintains persistent names for CD/DVD reader and writer devices.

# See udev(7) for syntax.

#

# Entries are automatically added by the 75-cd-aliases-generator.rules

# file; however you are also free to add your own entries provided you

# add the ENV{GENERATED}=1 flag to your own rules as well.

# hp_DVD_RW_AD-7581S (pci-0000:00:1f.2-scsi-0:0:0:0)

SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:1f.2-scsi-0:0:0:0", SYMLINK+="cdrom", ENV{GENERATED}="1"

SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:1f.2-scsi-0:0:0:0", SYMLINK+="cdrw", ENV{GENERATED}="1"

SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:1f.2-scsi-0:0:0:0", SYMLINK+="dvd", ENV{GENERATED}="1"

SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:1f.2-scsi-0:0:0:0", SYMLINK+="dvdrw", ENV{GENERATED}="1"

#************************* below is what was appended ****************
# original RTL2832U vid/pid (hama nano, for example)SUBSYSTEMS=="usb", ATTRS{idVendor}=="0bda", ATTRS{idProduct}=="2832", MODE:="0666"
# ezcap EzTV668 (E4000)SUBSYSTEMS=="usb", ATTRS{idVendor}=="0bda", ATTRS{idProduct}=="2838", MODE:="0666"
# Terratec Cinergy T Stick Black (rev 1) (FC0012)SUBSYSTEMS=="usb", ATTRS{idVendor}=="0ccd", ATTRS{idProduct}=="00a9", MODE:="0666"
# Terratec NOXON rev 1 (FC0013)SUBSYSTEMS=="usb", ATTRS{idVendor}=="0ccd", ATTRS{idProduct}=="00b3", MODE:="0666"SUBSYSTEMS=="usb", ATTRS{idVendor}=="0ccd", ATTRS{idProduct}=="00b4", MODE:="0666"SUBSYSTEMS=="usb", ATTRS{idVendor}=="0ccd", ATTRS{idProduct}=="00b7", MODE:="0666"SUBSYSTEMS=="usb", ATTRS{idVendor}=="0ccd", ATTRS{idProduct}=="00c6", MODE:="0666"
# Terratec Cinergy T Stick RC (Rev.3) (E4000)SUBSYSTEMS=="usb", ATTRS{idVendor}=="0ccd", ATTRS{idProduct}=="00d3", MODE:="0666"
# Terratec T Stick PLUS (E4000)SUBSYSTEMS=="usb", ATTRS{idVendor}=="0ccd", ATTRS{idProduct}=="00d7", MODE:="0666"
# Terratec NOXON rev 2 (E4000)SUBSYSTEMS=="usb", ATTRS{idVendor}=="0ccd", ATTRS{idProduct}=="00e0", MODE:="0666"
# PixelView PV-DT235U(RN) (FC0012)SUBSYSTEMS=="usb", ATTRS{idVendor}=="1554", ATTRS{idProduct}=="5020", MODE:="0666"
# Astrometa DVB-T/DVB-T2 (R828D)SUBSYSTEMS=="usb", ATTRS{idVendor}=="15f4", ATTRS{idProduct}=="0131", MODE:="0666"
# Compro Videomate U620F (E4000)SUBSYSTEMS=="usb", ATTRS{idVendor}=="185b", ATTRS{idProduct}=="0620", MODE:="0666"
# Compro Videomate U650F (E4000)SUBSYSTEMS=="usb", ATTRS{idVendor}=="185b", ATTRS{idProduct}=="0650", MODE:="0666"# Compro Videomate U650F (E4000)SUBSYSTEMS=="usb", ATTRS{idVendor}=="185b", ATTRS{idProduct}=="0650", MODE:="0666"
# Compro Videomate U680F (E4000)SUBSYSTEMS=="usb", ATTRS{idVendor}=="185b", ATTRS{idProduct}=="0680", MODE:="0666"
# Sweex DVB-T USB (FC0012)SUBSYSTEMS=="usb", ATTRS{idVendor}=="1f4d", ATTRS{idProduct}=="a803", MODE:="0666"
# GTek T803 (FC0012)SUBSYSTEMS=="usb", ATTRS{idVendor}=="1f4d", ATTRS{idProduct}=="b803", MODE:="0666"
# Lifeview LV5TDeluxe (FC0012)SUBSYSTEMS=="usb", ATTRS{idVendor}=="1f4d", ATTRS{idProduct}=="c803", MODE:="0666"
# MyGica TD312 (FC0012)SUBSYSTEMS=="usb", ATTRS{idVendor}=="1f4d", ATTRS{idProduct}=="d286", MODE:="0666"
# PROlectrix DV107669 (FC0012)SUBSYSTEMS=="usb", ATTRS{idVendor}=="1f4d", ATTRS{idProduct}=="d803", MODE:="0666"
# Zaapa ZT-MINDVBZP (FC0012)SUBSYSTEMS=="usb", ATTRS{idVendor}=="1b80", ATTRS{idProduct}=="d398", MODE:="0666"
# Twintech UT-40 (FC0013)SUBSYSTEMS=="usb", ATTRS{idVendor}=="1b80", ATTRS{idProduct}=="d3a4", MODE:="0666"
# ASUS U3100MINI_PLUS_V2 (FC0013)SUBSYSTEMS=="usb", ATTRS{idVendor}=="1b80", ATTRS{idProduct}=="d3a8", MODE:="0666"
# Dexatek DK DVB-T Dongle (Logilink VG0002A) (FC2580)SUBSYSTEMS=="usb", ATTRS{idVendor}=="1d19", ATTRS{idProduct}=="1101", MODE:="0666"
# Dexatek DK DVB-T Dongle (MSI DigiVox mini II V3.0)SUBSYSTEMS=="usb", ATTRS{idVendor}=="1d19", ATTRS{idProduct}=="1102", MODE:="0666"# Dexatek DK 5217 DVB-T Dongle (FC2580)SUBSYSTEMS=="usb", ATTRS{idVendor}=="1d19", ATTRS{idProduct}=="1103", MODE:="0666"
# MSI DigiVox Micro HD (FC2580)SUBSYSTEMS=="usb", ATTRS{idVendor}=="1d19", ATTRS{idProduct}=="1104", MODE:="0666"
# DigitalNow Quad DVB-T PCI-E card (4x FC0012?)SUBSYSTEMS=="usb", ATTRS{idVendor}=="0413", ATTRS{idProduct}=="6680", MODE:="0666"
# Leadtek WinFast DTV Dongle mini D (FC0012)SUBSYSTEMS=="usb", ATTRS{idVendor}=="0413", ATTRS{idProduct}=="6f0f", MODE:="0666"
# Genius TVGo DVB-T03 USB dongle (Ver. B)SUBSYSTEMS=="usb", ATTRS{idVendor}=="0458", ATTRS{idProduct}=="707f", MODE:="0666"
# GIGABYTE GT-U7300 (FC0012)SUBSYSTEMS=="usb", ATTRS{idVendor}=="1b80", ATTRS{idProduct}=="d393", MODE:="0666"
# DIKOM USB-DVBT HDSUBSYSTEMS=="usb", ATTRS{idVendor}=="1b80", ATTRS{idProduct}=="d394", MODE:="0666"
# Peak 102569AGPK (FC0012)SUBSYSTEMS=="usb", ATTRS{idVendor}=="1b80", ATTRS{idProduct}=="d395", MODE:="0666"
# SVEON STV20 DVB-T USB & FM (FC0012)SUBSYSTEMS=="usb", ATTRS{idVendor}=="1b80", ATTRS{idProduct}=="d39d", MODE:="0666"
# SVEON STV21 DVB-T USB & FMSUBSYSTEMS=="usb", ATTRS{idVendor}=="2b80", ATTRS{idProduct}=="d3b0", MODE:="0666"

Building and Install gr_osmoSDR

cd ../../ git clone git://git.osmocom.org/gr-osmosdr cd gr-osmosdr/ mkdir build cd build/ cmake ../ -Wno-dev make sudo make install sudo ldconfig

Building and Install Gqrx with command line.

git clone https://github.com/csete/gqrx.git gqrx.git
cd gqrx.git
mkdir build
cd build
cmake ..

make
sudo make install

If you want to build the code using the Qt development environment then follow the steps below

cd ../../
git clone https://github.com/csete/gqrx.git cd gqrx qtcreator ./gqrx.pro

A new window will open (the QT compiler).

When it opens click the build menu then the build all option.

QT Compiler

you should see The process "/usr/bin/make" exited normally.

Plug in your RTL dongle.

Now run gqrx.

gqrx

Select Yes

GQRX Should now be open. On the first run you will be prompted for a device listing.

Select your SDR (in my case RTL dongle)

 In the device drop down menu select "ezcap USB 2.0 DVB-T/DAB/FM Dongle", then continue to the main GQRX window.

Select File->Start DSP. You should now be receiving something.

Tune to a local radio station between 88-108Mhz FM.

select Wide FM Stero as the Mode Type.

Now connect a proper external antenna to your RTL dongle or Softrock HF/VHF kit.
Hope you have lost of fun ;-)

Here is a video of GQRX using the 100Khz to 17Ghz RTL dongle in direct conversion mode.

How to configure your direct conversion dongle.

Here is the screen-shot of the configuration on Linux for Gqrx

1. Device Select other
2. Device String rtl=0,direct_sample=2 (possibly 0/1/2) (This number could differ depending on which pin was wired via balin)

 

 

Device String rtl=0,direct_sample=2

Here is a picture of the 100KHX to 1.7Ghz rtl dongle

100Khz to 1.7Ghz RTL direct conversion dongle

They are available at http://www.giga.co.za/ocart/index.php?route=product/product&path=59&product_id=178