Submit a Story/Contact

If you would like to submit something that relates to cheap SDR (a project, blog post, something interesting you have found), please email us at [email protected].

We will look at your submission and if we think it is a good fit for our blog make a summary 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 product samples for an honest review. If you are interested in writing a non-commercial guest post for us, please also contact us on the above email address.

Product/Shipping Support

If you have a general question about RTL-SDRs or SDRs or third party software we ask you to please ask in our forums. If you email us we may not respond to questions about third party software as this should be asked in the forum.

If you need troubleshooting support please first ensure that you have been through our Quickstart guide and the troubleshooting section on it, as well as our V3 users guide. Common questions like how to use the HF mode and how to activate the bias tee are explained on the V3 users guide. 

If you have a question about shipping of an item please first read the shipping policy on our store and see if it answers your question. The shipping information is just under our product listings. If it is a request for tracking details please first check your old/deleted/spam mails for the order confirmation email which contains the tracking details. There will have been two emails from our email at [email protected], the second of which contains the tracking details.

If you suspect a lost postal item please contact your local postal agency first and inquire there. They have more information than we have. If they confirm it as lost or not received after a long time then please let us know and we can open an investigation on this side as well. Usually we must wait at least 6 weeks from the date posted before we can open a lost parcel investigation.

For everything else such as confirmed lost postal items, warranty claims and support inquiries that aren't covered by the quickstart or troubleshooting guide then please contact us at [email protected]. We aim to always reply within 1-2 business days. If we don't respond within 3 business days then 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. Remember, if you have questions about third party software, please ask in the forums only.

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I followed all directions tried a few times. V4 does nothing but make noise. FM kind of works. AM gets one local station. I never had issue with the version 3. Also installed latest version of sdr#. deleted anything associated with the old sdr#. Guess i and many others got a bad dongle? I guess only thing to do is go back to the 3. That was actually fun. Got excited for nothing.

Martin Williams

New user here:
Haven’t managed to get Airspy to run, have followed all the instructions for a V3 install, Zadig installation successful I think, try to run SDRSharp.exe and get the attached error.
Am running Windows 10 (version 10.0.14393on a Sony Vaio laptop.
Any help anyone can give would be very much appreciated.

Airspy error 2024-05-27.PNG

For AIS and ADS-B reception I have purchased a new AIS and ADS-B but it does not work properly.

・Raspberry Pi 4 Model B

The procedure was carried out with reference to this section.

Operation test results.
Test results for the dongle are as follows.

hiroyuki@raspberrypi:~ $ rtl_test -t
Found 1 device(s):
 0: RTLSDRBlog, Blog V4, SN: 00000001

Using device 0: Generic RTL2832U OEM
Found Rafael Micro R828D tuner
RTL-SDR Blog V4 Detected
Supported gain values (29): 0.0 0.9 1.4 2.7 3.7 7.7 8.7 12.5 14.4 15.7 16.6 19.7 20.7 22.9 25.4 28.0 29.7 32.8 33.8 36.4 37.2 38.6 40.2 42.1 43.4 43.9 44.5 48.0 49.6
Sampling at 2048000 S/s.
No E4000 tuner found, aborting.

Is the dongle set up correctly?
If there is a problem, please tell us how to set it up.


There’s no problem….don’t use the -t ….it’s for the E4000 dongle only.


I purchased a RTL-SDR V4 for a Mac (Monterrey OS) and try Gqrx without been able to listen to a FM radio: I bought that USB Key to listen to new Digital Radio (DAB):
Grqx identify my RTLSDR Blog Blog V4: Despite that, I am not able to listen to an FM regular radio nor to a DAB radio

Ahmed Hassan

Install Zadig v2.5 or higher, choose the menu item to show all devices, select the RTL device and make sure you install the WinUSB driver that Zadig offers for you to install.

Tim Walters

I need simpler intructions. none of this works!


It doesn’t get much simpler than the guides on this site.

Graham Bennett

Hi have installed NTL433 plugin to my SDR#1919 and while plugin window opens ok I cannot start because only “wait” showing.
Any idea how to fix?

Dave Donaldson KC3OSG

Over the past four months I’ve purchased five RTL-SDR BLOG V4 dongles. My idea was to continue adding to the pile, and then to gift all but two of them (one to be a spare as I’m aware these are a limited model) to my friends.

So I’ve put them all through some serious HF performance testing.

I’ve got five wire antennas — a 173 foot NREF (Non-Resonant End-Fed), a 71 foot NREF, plus 20, 40 and 80 meter half-wave dipoles.

I’ve got four radios — an Icom IC-7300, a Yaesu FTDX-10, an Icom IC-718 and a Yaesu FT-840. None of my radios are slouches and they represent a decent spread of design types — dual conversion super heterodyne, direct conversion SDR and of course the hybrid super heterodyne and SDR designs. I also have an AirSpy HF+ Discovery and a Collins 32S-1 transmitter.

My original goal was to use my FT-840, my IC-718 and my Collins 32S-1 as 100 watt transmitters/exciters, along side of the V4 as the receiver.

Over these months I’ve settled on HDSDR as my favorite SDR application as looks and works exactly like a ham radio. It has a stable, non-docking layout with keystroke shortcuts for ALL functions, large calibratable S-meter, squelch, customizable presets from a Frequency Manager, multiple one-click and fully automatic notch filtering, drag-and-drop bandwidth settings and rig control through OmniRig. It works perfectly with all four of my test radios.

All I can say is…WOW. I’m totally amazed, and I emphasize amazed with these SDRs. The are truly spectacular.

Now here comes the honest-to-God truth…the RTL-SDR BLOG V4 performs as well, and in some cases clearly better than any of my radios – flat out – period.

I have directly (but randomly) compared each of these V4’s with all antennas, against all of the four radios on all HF bands (on SSB only) and I am here to tell you [sadly I’ll admit] your SDR’s out performed them all, in all but one instance. And I don’t remember what that was because it was early in my less than than perfect and somewhat subjective testing.

The physical conditions were all the same – in my yard, in the middle of the Michaux State Forest in PA, along the Appalachian Trail, in a 3/4 acre clearing. The antennas are all below 37 feet, the 24/40 meter dipoles are only at 17 sloping down to 12 feet off the ground, the 173 foot NREF is at 37 sloping down to 22 feet and the 80 meter dipole is 34 sloping down to 12 feet high. So nothing special there.

There are few if any higher power AM broadcast stations nearby — only one at 1KW daytime only and one 5KW FM six or seven miles away.

In one case, with only one of the V4s, for some strange reason I was able to see and hear a ham talking to Europe easily at S4 to S5 (calibrated to match the IC-7300’s S-meter with my Rohde & Schwarz CMU200 Communications Test Set), with a noise floor at S3. The spectral display on HDSDR showed the 3.830 MHz signal at 10-12 dB over the noise floor – and get this, that same signal could not be heard nor did it even show up at all on either the DX-10 or the 7300 using the same bandwidth, preamp ON or OFF, and same antenna.

Clearly this V4 was different, and I can’t figure out why.

I repeated this testing over more than an hour, and substituted three of the other V4s and those two radios over and over, several times, using three antennas.

So all I gotta say is…well done.

And oh…one more thing…can you tell me why this one V4 is soooo much more sensitive than the other three?

Obviously I’m not going to gift this one away to anybody, ever.

I didn’t change anything when comparing these. I just stopped the HDSDR app, unplugged and plugged in the next one, and launched HDSDR. No values or ports or cables were different.

Tim Walters

I am not a software engineer. I ONLY have a doctorate in music composition. I need much simpler intructions!

Jose O Arrom

Two questions: purchased RTL-SDR blog v4. I’m would like to get an adapter to connect it to my USB-C port for use with Windows. Is it possible to use and adapter, and which one? I have seen several apps for running SDR software on an iOS Apple tablet, are these legitimate? I would need a similar adapter. Thanks.

Jose O Arrom

Thank you!

Hello, I bought rtl-sdr v4 but I can't run it on linux opensuse tumbleweed please help


Good morning
Please advise how I can enable the SPF5189z LNA power supply via the LTR-SDT.COM V4 connecting cable?

Dzień dobry
Bardzo proszę o podpowiedź w jaki sposób mogę uruchomić zasilania LNA SPF5189z przez kabel łączący LTR-SDT.COM V4?


How to turn on the power supply via a direct connection or via a cable between LTR-SDT.COM V4 – SMA-F antenna connector => SMA-F OUT +5V LNA SPF5189z?


Hello, I am the developer of RForAll, an app for scanning and analyzing radio frequencies on MacOS. I always recommend the RTL SDR V3 dongle, and I would like to make my application natively compatible with the V4. Could you please contact me at my email [email protected]? A while ago, I sent an email to admin but didn’t receive a response. I suppose you are very busy, but I need to ask them a few questions. Thank you.


I’ve downloaded the newest software for the V3 dongle and I don’t see a .bat file anywhere???


Hey there! Just dropped you an email about my RTL-SDR project. Excited to share and potentially feature on your blog. Let me know what you think


Just tried to install Zadig 2.8 driver on my new Win11. Using RTL2832UHIDIR. Installer times out. I will be using on HDSDR. HDSDR does not show the RTL-Dongle as an input option. The driver for Zadig is not installing.



V4 works on Windows 10?
Have a link with drivers?

Ross Williams


I’ve been using my V3 dongle with a longwire antenna and a nooelec balun to listen to HF and shortwave broadcast with great success. I recently purchased the V4 dongle to take advantage of the built in upconverter but have been unable to make it work.

I have followed the quick start guide to the letter and have no clue what I’m missing. My V3 dongle still works just fine. Any help would be appreciated.


Can you tune any other frq using V4? For example commercial FM, if not, first replace .dll file from rtl-sdr github, and if you are using with V3 for V4 don’t use direct sampling mode option. If you are SDR# user try other programs like SDR++, HDSDR or SDRConsole

R vd meer

There is a other option ,download from this website
It is de sdrsharp with all plugins automaticly installed.
Tried it on my v3 and its working without any problems.
I use windows 10 64 bits with all updates installed.


Hi, I have used sdr eeprom (from sdr#) to change the product name with -p command. But now the sdr v4 don’t work correctly anymore, sdr# see the dongle but only noise no any radio station even on the commercial FM band. I already try to restore back the original string of the product but no solution. I think the sdr eeprom tool incluse in the sdr# have write the eeprom on some wrong address. You can help me? can i have the original dump of the eeprom and the correct tool to rewrite it on the dongle? Thanks.


Try to restore with program RTLTool Distribution


Hi! I just wanted to let you know that there is a small typo in the last paragraph of the Spot RTL-SDR Blog V3 Clones section of the Store page. The word “reputable” is written as “repurable”.


hello! i followed the directions as best as i could. i cant get it to work. sdrsharp wont see the dongle. always says no device detected. all of the instructions are outdated. its now 1919 not 1913. did the whole zadig driver on bulk data 1 not zero etc still no joy. any suggestions?


Hello, since when has this been like this? This is suddenly the same for me under Windows 11 32H22, the 2832U driver is simply no longer installed and is rejected by Windows! Just like that. Also no help from RTL-SDR.Com can be seen. A pity. I have both sticks, V3 and new, v4 and both no longer work. Zadeg claims with every installation >Driver successfully installed!<???


As already reported, Zadec always says driver is installed. However, SDRSharp says: No device found! Unfortunately I misclicked on the first WINDOWS 11 error message. Now they are no longer displayed. It said: “Driver does not meet the compatibility requirements and will therefore NOT be installed.”
There is also no driver in the device manager. So Zadec is “lying” here…!?

If I pull the stick out of the USB-A interface, the device manager reacts and rebuilds the display. Even when I plug the stick back in, it reacts exactly the same, but it doesn’t work without the driver. As I said, I had it working in build 22H2!?? So what could this be?




How do I change serial number on rtl-sdr

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