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  1. Anonymous

    SDRSharp TETRA demod plug-in crash investigations

    An item with the same key has already been added.
    at mscorlib.dll.ThrowHelper.ThrowArgumentException (IL offset: 0x10)
    at mscorlib.dll.Dictionary`2.Insert (IL offset: 0x81)
    at SDRSharp.Tetra.dll.MM_protocol.ParseMMPDU (IL offset: 0x219)
    at SDRSharp.Tetra.dll.SduParser.Parse (IL offset: 0x67)
    at SDRSharp.Tetra.dll.PduParser.ResourcePDU (IL offset: 0xe6)
    at SDRSharp.Tetra.dll.PduParser.ParsePDU (IL offset: 0x55)
    at SDRSharp.Tetra.dll.TetraDecoder.Process (IL offset: 0x698)
    at SDRSharp.Tetra.dll.TetraPanel.DecodingThread (IL offset: 0x98)
    at mscorlib.dll.ThreadHelper.ThreadStart_Context (IL offset: 0x14)
    at mscorlib.dll.ExecutionContext.RunInternal (IL offset: 0x79)
    at mscorlib.dll.ExecutionContext.Run (IL offset: 0x0)
    at mscorlib.dll.ExecutionContext.Run (IL offset: 0x2b)
    at mscorlib.dll.ThreadHelper.ThreadStart (IL offset: 0x8)

    SDR# v1.0.0.1700, RTL-SDR, TETRA demodulator plug-in (hotfix #6), Windows 10 Home (64-bit) version 1809 (OS build 17763.316), .NET Framework version 461814 (On all other OS versions, including Windows 10 October 2018 Update: 461814)

    I started TETRA demod plug-in (config: increase PDU element verbosity checked, other options unchecked) and started baseband recording (RTL-SDR 0.25 MSPS, 8 bit PCM) and opened network info window. I also started logging call tab PDU text box to file (by using screen scraping utility which I coded with C#). When SDR# crashed it still was able to close the wav file correctly. I replayed the IQ file in SDR# and it also caused program crash. I opened log file and last line was (also when crash happens the last line seen in PDU textbox was the same as in log file):

    PDU encrypted:2 Data incorrect! Carrier:x TimeSlot:xx SSI:x D_Facility

    I did some experiments without IQ recording (with call tab textbox logging) and when crash happened, the last line in the log file was: ….. D_Facility

  2. Zoltan

    Apologize if my stream having some outage… The rtl-sdr dongle disconnects for some reason time to time and I had to restart OpenWebRX manually from terminal… Perhaps the RPi 3 USB having difficulties? I will try to connect an independent 5V for the rtl-sdr dongle later. If any of you guys have an idea / experience with similar problem please share. (RPi get stable 5V this is what I checked and improved recently but still halts once a day or so. )

    Thanks

  3. rehn

    Hi
    I bought a SDR dongle V3 from Electrokit in Sweden
    I have a problem i direct sampling mode.
    If I connect the dongle direct to my USB port I get nothing but the noise from the unit itself.
    With or without antenna connected.
    If I connect the dongle using extension cord I get some signal, but almost only very strong noise.
    It seems like its only the USB cord that function as antenna in direct sampling mode and the
    normal antenna connector is not used.

    Am I missing something, or is my unit broken ?

  4. Rehn

    Hi
    I bought a SDR dongle V3 from Electrokit in Sweden
    I have a problem i direct sampling mode.
    If I connect the dongle direct to my USB port I get nothing but the noise from the unit itself.
    With or without antenna connected.
    If I connect the dongle using extension cord I get some signal, but almost only very strong noise.
    It seems like its only the USB cord that function as antenna in direct sampling mode and the
    normal antenna connector is not used.

    Am I missing something, or is my unit broken ?

    regards
    John rehn

  5. AD5NL

    I really hope that we end up with something like this in the Western Hemisphere in the next few years. Listening to the websdrs, it basically sounds like an HF WARC band, but with zero noise.

  6. stamatis

    Hey. I bought an rtl-sdr the other day and it gets extremly hot after a few minutes of using it.
    Is there anything that I can do?

  7. Not Sure

    B210 user.

    Favourite, SDR Console (usability, appearance, layout). 56MHz bandwidth is either too much for USB, or crashes out the prog altogether. Probably needs to have a soft-core placed on the FPGA for demod-on-device, and save the USB link.

    Best for weak stations, HDSDR, (uses EXTIO.dll).

    Best for bandwidth, HDSDR, can select 32MHz bandwidth (no 56MHz option), get overruns, but works fine just the same. Doesn’t look like EXTIO supports 56MHz.

    Tx support, SoDaRadio. But frustrating Linux only. If using B210, can add a mixer, use both TX’ers and actually run a 10GHz station on the cheap. (which I plan to).

    Cubic, never, ever worked, even with soapy.

  8. Not Sure

    Very interesting indeed.

    I went the other way, and bought a Com-on-air device (PCMCIA), so I had to buy an adapter to mount that in my PC. AND I had to run it under 32 bit image. Not cheap.

    However, the performance was lacking, so I opened it, and soldered a suitable external antenna connector to improve range.

    But WOW did it work well. And sorry to say its functionality looked somewhat more ‘refined’ than your demo. The downside being that it only dumped to a .wav file or something – long time since I’ve used it. But in the built-up place that is the UK – there were LOTS of unencrypted handsets to listen to, and the Com-on-air changed freq with the handsets too.

    I saw that someone paid a developer to pipe that output to audio in real time, and not just dump to a file. Almost considered that too, but you know how life gets in the way…

    I will try this with my ettus device, given that I saw a .grc file in your video for it.

    • Corrosive of SignalsEverywhere

      The com-on-air is some NICE hardware. I agree 100% and the scanning is superb but man is it expensive.

      You know you can listen in near-real time with that. I paid a developer to modify it years ago.
      https://github.com/KR0SIV/dedected

      Just re-compile the above into the folder over top of your existing installation.
      That’ll do live playback and it’ll start on the US band.

      It’s an older video but I do have a demo of the com-on-air card as well.
      https://www.youtube.com/watch?v=MycM38SjHjg

      oh, I see you’ve already found the software XD Yeah that was me.

      I’m working to improve the dect2 software to auto-follow the handset freq. Hopefully that will go as planned.

  9. John

    Hmmm.. I searched for ‘radwave’ in the Google play store just now, but no sign of it.
    It may be getting updated. I’ll try again later.

    • Damon

      Alex,
      I’ve installed it on my Samsung Galaxy S7 last night. I first searched ‘rtl-sdr’, but it didn’t come up. So when I searched for ‘Radwave’ it popped right up.
      I know this is a beta, but I already love this for looking at push to talk and DMR signals.

    • admin

      It’s showing as active in the Play store, although it strangely says that it’s incompatible with my Galaxy S8. Try the link in the post above which directly links to the Play store page. Also look on radwave.com, although that just directs the download back to the Play store.

      • AMS

        It shows as beta for my LG V30. I’m surprised that google thinks that the S8 isn’t compatible since it has the same basic chipset (if you are in North America anyway). I ordered a USB-C to USB-A 3.0 adapter so I’ll be interested in testing this out with my RTL-SDR v3. I had another app that I used with my older Xperia Z2 but it didn’t have the features I needed. DSD+ decoding was promised but never showed up. Hopefully the developer of this app will eventually get DSD decoding operational.

  10. KevinP

    if you havent gotten an answer yet. Here’s what worked for me.
    do the following one line at a time……
    cd pkg-rtl-sdr
    cmake -G “Unix Makefiles”
    make
    make install

  11. michael

    Since its only USB 2, obviously 20MHz of 56MHz can’t be streamed, what is the point? When using the full and width in Matlab does it save to the RAM and then it pulls the data off asynchronously?

    • Stefan

      You are right – you can’t stream the full bandwidth over USB. But you can implement your own software on the Pluto itself and stream only your demodulated/decoded data to a PC, if you like. The Pluto-SDR is such a nice piece of hardware, very affordable and very friendly.

  12. Tony Levand

    Hi,
    Whats the dynamic range of the KerberosSDR for DF? Is it better than the old Doppler units? On 2 meters, how weak a signal and how strong a signal can the direction finder work. Do I have to start the hunt with a Yagi and HT and drive until the unit gets a bearing? Can I drive up to a 50 watt transmitter?

    Thank you,
    Tony

  13. Lucas

    And can they do digital voice listening? Using to receive only. What software will I need on my Android device in order to monitor digital voice? (Already have sdr touch and driver)