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If you would like to submit anything you have found or made that relates to cheap SDR (a project, blog post, something interesting you have found), or you require product support for one of our RTL-SDR products, please email us at [email protected].

If we don’t respond within 3 business days the mail may have gone to our spam folder. Please try to email again using different keywords. We do check our spam filter once a week just in case, but some messages could still be missed.

We will look at your submission and if we think it is a good fit for our blog make a post about it, making sure to link and credit your original source. If you don’t have your own website or blog, don’t worry, just write about your project in an email and we will host any images or documents related to your project for you. Usually we will get to your submission within a few days.

Please note that we will not accept payments or incentives in return for any type of post except for samples for an honest review. But if you want to advertise on our site through banners please contact us.

If you are interested in writing a non-commercial guest post for us, please also contact us on the above email address.

You can also contact us at [email protected] regarding product support and warranty information for any products sold by us. Please also check the “Warranty” section on the store page at

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  1. virender

    Hi all,
    I have V3 dongle connected with 9 mtr rg 174 cable and end with some long copper wire. There is lot of interference at 1 hz to 9 hz in direct sampling mode. My question is how to remove these interference to get decent reception at HF also some suggestion to improving dynamic range at HF.

  2. roadrunner

    HDSDR Hardware support has a new RTL EXTIO USB DLL marked march 20,2017 get a scoop on it. It has better decimation. Decimation seems to match the R820T/T2 chip

  3. Joey

    Sometimes when I click on an article my browser gets redirected to malicious websites. This only happens on my mobile browser on

  4. Virender

    In SDR# while browsing on shortwave there is a FM Ghost signal appear (image of actual signal is here which is actually broadcasting at 91.1 Mzh then how can I remove it completely without ignoring and in other image there is a strong interference appear at 1Mhz to 3Mhz always. Is it natural at this frequency or may be other cause to this interference.


    RTL SDR software define Radio is a unique application and very useful receive FM Radio station very clear. SDR is also very useful to have updated weather forcasting information with taking pictures from the space and to know and predict the weater, Cyclone etc. Also to track Aircraft flying from one destination to other. I love to use RTL SDR and to monitor many application related to AMATEUR BANDS as receiver.

  6. JM

    If there is a working scanner plug in or stand alone I can’t seem to find a working one. Anyone (admin this is for you too!) have a working scanner plug in for SDR# or can recommend a program that works with the dongle that CAN scan?

  7. Virender

    Hi admin,
    Is there any direct replacement for rtl2832u chip to improve this dongle because it is main bottleneck in rtl-sdr? Such as mirics chip so that rt8202t2 can be used in full potential.

  8. virender

    Hello Admin,

    Today I checkout the RTLSDR store and buy a dongle. I want to know it arrival time at my locations. How much time It will take to reach at me.


    • admin

      You’d probably need to request the author of the Android driver and software to include a setting for it. If you email him let us know that we’re happy to help him if he needs more info.

  9. KD2OM

    This is what I get when trying to turn on the bias Tee so that I can use the Spyverter.
    My V3 dongle works fine with VHF.
    I also need to have the bias tee turned on all the time and I don’t have much interest in above 30 MHz. How is this done.

    sudo rtl-sdr/rtl-sdr/build/src/rtl_biast -b 1
    Kernel driver is active, or device is claimed by second instance of librtlsdr.
    In the first case, please either detach or blacklist the kernel module
    (dvb_usb_rtl28xxu), or enable automatic detaching at compile time.
    usb_claim_interface error -6
    [email protected] ~ $

    • Schm1tz1

      As admin said. rmmod the kernel driver, blacklist it or just compile rtl_sdr with the “detach” option by adding the cmake option “-DDETACH_KERNEL_DRIVER=ON”.

  10. Neil

    I’m using rtl-sdr. I receive NOAA sat signals and I’m able to extract images but not with Meteor M2. Is Meteor M2 up? I’ve been trying it for a month now but I still have no luck. The frequencies I’ve tried are 137.1 and 137.925. I’ve tried A) rtl_fm -f 137.925M -g 0 -s 384k – > meteor.raw B) rtl_fm -f 137.925M -g 50 -s 384k – > meteorv3.raw C) rtl_fm -f 137.1M -g 50 -s 120k – > meteor120.raw D) rtl_sdr -f 137100000 -s 900001 -g 0 -p 49 test13.raw and more without luck. I convert the raw file to wax using sox like this sox -r 192000 -e signed -b 16 -c 2 meteorv4.raw meteorv4.wav followed by sox meteorv4.wav meteorv130.wav rate 130000 then I open it in LRPTX.exe BSPK/QSPK DeWavulator. I never get the 4 dots in constellation even if I play with Symbol Rate. All I get is this – even on the parts of the wav file. What could I be doing wrong?

  11. Michael Fortner

    I am having a problem with my RTL-SDR RTL2832u R820T2 v3 and my Windows 7 computer. It was working fine until I tried installing SDRUno Monday evening and couldn’t get it to work with the dongle. No problem, I have SDR#, HDSDR, and RTL1090 that all work fine so I uninstalled SDRUno. Now, when I try any of those programs, they work for a few minutes, then freeze up and either shut down or just sit there until I try to kill the process. However, when I try reloading any of my SDR programs, nothing happens. I go into task manager and it shows the original program still running and the new one as well, and won’t let me kill the program. Even KillProcess.exe fails to kill it. I have to reboot the computer to start up any SDR programs again, only to have it happen again. I have Windows 7 SP1 with Microsoft .net and Visual C++ being the latest versions. I just got the dongle this month and now I can’t use it. HELP!

  12. Gabriele

    Hello , yesterday I bought the new rtl sdr com from your site on amazon and I do not know how it happened did so ordered twice, but I need one you can annullarmi an order ?

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