Архив за 11.10.2019

Is there any way to receive LF/VLF/ELF signals with an SDR? What kind of antenna would I need?

I've heard about some of the signals that come in at ultra low frequencies, like TACAMO signals or submarine communications, and they seem like they'd be interesting to try to receive. I have a Nesdr Smart, a SmarTee XTR, and a Ham-It-Up, but I don't know if the Ham-It-Up goes low enough. How would I go about receiving these low frequency signals?

submitted by /u/DuckEsquire
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gr-osmosdr does not seem to be installing correctly (GNU Radio).

Hi,

Running Ubuntu 18.04. I am new to linux btw.

The issue is that I do not see any RTL-sdr source blocks in GNU radio 3.7.11.

Current situation

I have installed librtlsdr, and my rtl sdr v3 dongle is detectable, for instance the command "rtl_test" identifies my sdr dongle successfully.

To add support for my dongle in GNU radio you need to install gr-osmosdr. I followed the guide below, section "GNU Radio source":

https://osmocom.org/projects/rtl-sdr/wiki/Rtl-sdr

And that's where I am at the moment, I have "installed" gr-osmosdr, but I do not see any rtl-sdr source blocks in gnu radio.

Observations

First observation is based on thread below:

https://forums.hak5.org/topic/34367-no-source-in-grc-after-installing-rtl-sdr-and-gr-osmosdr/

In my case, I cannot see any new rtl or osmosdr xml files in:

/usr/share/gnuradio/grc/blocks 

In addition, in:

/usr/local/share 

I do not see any files/folders relating to gr-osmosdr or GNU at all.

Second observation is that if I open up synaptic, gr-osmosdr does not have the "green" box checkmarked. In other words synaptic says that the package is not installed?

Third observation is that gr-osmosdr, when installing, failed to detect the librtlsdr package. I base this on the "make" output below when installing gr-osmosdr ("-- librtlsdr not found."). Feel free to go through it in case something else is strange.

-- Build type not specified: defaulting to release. -- Extracting version information from git describe... -- Configuring Boost C++ Libraries... -- Boost version: 1.65.1 -- Found the following Boost libraries: -- thread -- system -- chrono -- date_time -- atomic -- Could NOT find PkgConfig (missing: PKG_CONFIG_EXECUTABLE) Checking for GNU Radio Module: RUNTIME * INCLUDES=/usr/include * LIBS=/usr/lib/x86_64-linux-gnu/libgnuradio-runtime.so GNURADIO_RUNTIME_FOUND = TRUE Checking for GNU Radio Module: BLOCKS * INCLUDES=/usr/include * LIBS=/usr/lib/x86_64-linux-gnu/libgnuradio-blocks.so GNURADIO_BLOCKS_FOUND = TRUE Checking for GNU Radio Module: PMT * INCLUDES=/usr/include * LIBS=/usr/lib/x86_64-linux-gnu/libgnuradio-pmt.so GNURADIO_PMT_FOUND = TRUE -- Could NOT find PkgConfig (missing: PKG_CONFIG_EXECUTABLE) -- Could NOT find GNURADIO_IQBALANCE (missing: GNURADIO_IQBALANCE_LIBRARIES GNURADIO_IQBALANCE_INCLUDE_DIRS) -- Could NOT find PkgConfig (missing: PKG_CONFIG_EXECUTABLE) -- Could NOT find PkgConfig (missing: PKG_CONFIG_EXECUTABLE) -- Found gnuradio-uhd: /usr/include, /usr/lib/x86_64-linux-gnu/libgnuradio-uhd.so -- Could NOT find PkgConfig (missing: PKG_CONFIG_EXECUTABLE) -- Found gnuradio-fcd: /usr/include, /usr/lib/x86_64-linux-gnu/libgnuradio-fcd.so -- Could NOT find PkgConfig (missing: PKG_CONFIG_EXECUTABLE) -- gnuradio-fcdproplus not found. -- Could NOT find GNURADIO_FCDPP (missing: GNURADIO_FCDPP_LIBRARIES GNURADIO_FCDPP_INCLUDE_DIRS) -- libosmosdr not found. -- librtlsdr not found. -- libmirisdr not found. -- Could NOT find PkgConfig (missing: PKG_CONFIG_EXECUTABLE) -- Could NOT find LIBHACKRF (missing: LIBHACKRF_LIBRARIES LIBHACKRF_INCLUDE_DIRS) -- Could NOT find PkgConfig (missing: PKG_CONFIG_EXECUTABLE) -- Could NOT find LIBAIRSPY (missing: LIBAIRSPY_LIBRARIES LIBAIRSPY_INCLUDE_DIRS) -- Could NOT find PkgConfig (missing: PKG_CONFIG_EXECUTABLE) -- libbladeRF not found. -- Could NOT find SoapySDR (missing: SoapySDR_DIR) -- libfreesrp not found. -- Could NOT find Doxygen (missing: DOXYGEN_EXECUTABLE) -- -- Checking for module SWIG -- Disabling SWIG because version check failed. -- -- The build system will automatically enable all components. -- Use -DENABLE_DEFAULT=OFF to disable components by default. -- -- Configuring Python support support... -- Dependency PYTHONLIBS_FOUND = TRUE -- Dependency SWIG_FOUND = FALSE -- Dependency SWIG_VERSION_CHECK = FALSE -- Disabling Python support support. -- Override with -DENABLE_PYTHON=ON/OFF -- -- Configuring high resolution timing... -- High resolution timing supported through clock_gettime. -- -- Configuring Osmocom IQ Imbalance Correction support... -- Dependency GNURADIO_IQBALANCE_FOUND = FALSE -- Disabling Osmocom IQ Imbalance Correction support. -- Override with -DENABLE_IQBALANCE=ON/OFF -- -- Configuring sysmocom OsmoSDR support... -- Dependency LIBOSMOSDR_FOUND = FALSE -- Disabling sysmocom OsmoSDR support. -- Override with -DENABLE_OSMOSDR=ON/OFF -- -- Configuring FUNcube Dongle support... -- Dependency GNURADIO_FCD_FOUND = TRUE -- Enabling FUNcube Dongle support. -- Override with -DENABLE_FCD=ON/OFF -- -- Configuring FUNcube Dongle Pro+ support... -- Dependency GNURADIO_FCDPP_FOUND = FALSE -- Disabling FUNcube Dongle Pro+ support. -- Override with -DENABLE_FCDPP=ON/OFF -- -- Configuring IQ File Source & Sink support... -- Dependency GNURADIO_BLOCKS_FOUND = TRUE -- Enabling IQ File Source & Sink support. -- Override with -DENABLE_FILE=ON/OFF -- -- Configuring Osmocom RTLSDR support... -- Dependency LIBRTLSDR_FOUND = FALSE -- Disabling Osmocom RTLSDR support. -- Override with -DENABLE_RTL=ON/OFF -- -- Configuring RTLSDR TCP Client support... -- Dependency GNURADIO_BLOCKS_FOUND = TRUE -- Enabling RTLSDR TCP Client support. -- Override with -DENABLE_RTL_TCP=ON/OFF -- -- Configuring Ettus USRP Devices support... -- Dependency UHD_FOUND = 0 -- Dependency GNURADIO_UHD_FOUND = TRUE -- Disabling Ettus USRP Devices support. -- Override with -DENABLE_UHD=ON/OFF -- -- Configuring Osmocom MiriSDR support... -- Dependency LIBMIRISDR_FOUND = FALSE -- Disabling Osmocom MiriSDR support. -- Override with -DENABLE_MIRI=ON/OFF -- -- Configuring HackRF & rad1o Badge support... -- Dependency LIBHACKRF_FOUND = FALSE -- Disabling HackRF & rad1o Badge support. -- Override with -DENABLE_HACKRF=ON/OFF -- -- Configuring nuand bladeRF support... -- Dependency LIBBLADERF_FOUND = FALSE -- Disabling nuand bladeRF support. -- Override with -DENABLE_BLADERF=ON/OFF -- -- Configuring RFSPACE Receivers support... -- Enabling RFSPACE Receivers support. -- Override with -DENABLE_RFSPACE=ON/OFF -- -- Configuring AIRSPY Receiver support... -- Dependency LIBAIRSPY_FOUND = FALSE -- Disabling AIRSPY Receiver support. -- Override with -DENABLE_AIRSPY=ON/OFF -- -- Configuring SoapySDR support support... -- Dependency SoapySDR_FOUND = 0 -- Disabling SoapySDR support support. -- Override with -DENABLE_SOAPY=ON/OFF -- -- Configuring Red Pitaya SDR support... -- Enabling Red Pitaya SDR support. -- Override with -DENABLE_REDPITAYA=ON/OFF -- -- Configuring FreeSRP support support... -- Dependency LIBFREESRP_FOUND = FALSE -- Disabling FreeSRP support support. -- Override with -DENABLE_FREESRP=ON/OFF -- -- ###################################################### -- # Gnuradio enabled components -- ###################################################### -- * FUNcube Dongle -- * IQ File Source & Sink -- * RTLSDR TCP Client -- * RFSPACE Receivers -- * Red Pitaya SDR -- -- ###################################################### -- # Gnuradio disabled components -- ###################################################### -- * Python support -- * Osmocom IQ Imbalance Correction -- * sysmocom OsmoSDR -- * FUNcube Dongle Pro+ -- * Osmocom RTLSDR -- * Ettus USRP Devices -- * Osmocom MiriSDR -- * HackRF & rad1o Badge -- * nuand bladeRF -- * AIRSPY Receiver -- * SoapySDR support -- * FreeSRP support -- -- Building for version: v0.1.4-127-g4d83c606 / 0.1.5git -- Using install prefix: /usr/local -- Configuring done -- Generating done -- Build files have been written to: /home/daniel/gr-osmosdr/build 

Would appreciate any pointers.

Cheers

submitted by /u/radio_lurker
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rtl_test on Raspberry Pi, losing samples?

Hi

I'm using a Raspberry Pi 4b (1GB) as an rtl_tcp server, with my Nesdr Smartee dongle. It actually appears to be working fine (connecting remotely with SDRSharp) but when I was setting it up I noticed that rtp_test is reporting errors:

pi@raspberrypi:/ $ rtl_test Found 1 device(s): 0: Realtek, RTL2838UHIDIR, SN: 00000001 Using device 0: Generic RTL2832U OEM Found Elonics E4000 tuner Supported gain values (14): -1.0 1.5 4.0 6.5 9.0 11.5 14.0 16.5 19.0 21.5 24.0 29.0 34.0 42.0 Sampling at 2048000 S/s. Info: This tool will continuously read from the device, and report if samples get lost. If you observe no further output, everything is fine. Reading samples in async mode... Allocating 15 zero-copy buffers lost at least 3956 bytes 

This doesn't just happen for the first few seconds, it continues indefinitely.

It also happens even at the lowest sample rates, and whether I connect to USB 2 or USB 3.

Is this normal, or does it suggest a driver or device issue?

Thanks

submitted by /u/plummet555
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Comment on RTL-SDR Tutorial: Following Trunked Radio with Unitrunker by Anonymous

Close SDR# first. It can’t open the device if it’s being used by another program.

RTL-SDR Discussion • Re: SDR has clear strong signal, 2 Meter ham rig has bad signal using same antenna

Besides possible antenna connection problems something could have blown out the front end receive transistor/fet of your handy talky. I would think even the lowly uv5r would have a better receiver than a dongle.

Statistics: Posted by nospam — Fri Oct 11, 2019 7:20 pm


SDRPlay automated reception

Hey guys,

I just received my RSP1 (the original, without the a) cause I wanted to be able to filter out stuff and have better reception basically for automated reception of the weather sats. But I want to give it a try as well with WeFax, etc.

Anyone can guide me into the right direction as to how to achieve this with this device? Preferably with a RPi, which is what I've been using so far.

I've compiled play_sdr as a replacement for rtl_fm, but then I get stuck with sox cause if I'm right, play_sdr only wants to write a file and thus I can't pipe it.

Anyone can get me on the right track here?

submitted by /u/theakito
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RTL-SDR Discussion • sdr uno hdsdr how are filters set?

I think sdruno works with hdsdr, right? If so I'm wondering how the programming of all those bandpass filters is managed? Is the desired frequency information sent via usb up to the rsp1 unit that then selects the proper bandpass?

Statistics: Posted by nospam — Fri Oct 11, 2019 6:30 pm


How to do batch sampling with a script?

I am using RTLSDR on macOS with Cubic SDR, it works great and is very intuitive.

Now I want to do a frequency envelope analysis which where I need to basically 3-d plot intensity versus frequency and time. I can probably figure out the math to do that part (or get help). But I need data.

The data I need is 1-second samples across the entire frequency range.

What tools are available for loop over the frequency range and save the samples for each band?

submitted by /u/fulldecent
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Troubleshooting Help • Re: R820T2 dongle faulty connection

Hello! Make note that in my case, the SMA female connector from the RTL-SDR dongle is somehow a little bit too long and it's creating a short circuit into the SMA male connector from the antenna. You can use a file to remove half a milimeter of this connector.

Statistics: Posted by Aldebaran — Fri Oct 11, 2019 6:18 pm


Rtl-sdr with Raspberry Pi

I am using the rtl2832u with a raspberry pi3. I'd like to use the sdr to be able to detect cellphone signals. I don't need to know the exact location, or information being transmitted. I'd like to specifically pick up the channel the cellphone is using to talk to the base station. (not sure how to find this) I'd like to also limit myself to the GSM Band (850Mhz). If someone can point me in the right direction to a tutorial or more info I'd greatly appreciate it. But essentially I'd like to write a python script that will use the sdr and simply (maybe not so) output - 'Cell signal detected' when a nearby cell talks to the base station. I also imagine that I would want to limit the radius of detection.(maybe I can limit this via the python script)

-Let me know if you have any questions

submitted by /u/bboieddie
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