RTL-SDR - an SDR receiver from a cheap DVB-T tuner on a USB connector

Even trivial, you only need to change during work, all the programs that I used allowed to change only after stopping. It is also badly described;



In-Phase = Direct Sampling from RTL I input a Quadrature = Direct Sampling x Q input. For higher frequencies it should be set to None. You can receive in the In-phase setting because the R802T2 has only one output connected to I, and Q is used by default for the lower band.

SP5IT wrote:

I have a problem with SDRsharp, new and old not colored version. It has always been.
Dongiel REALTEK 2832U, Windows 7x64, WinUSB (v6.1.7600.16385)
2 sound cards, onboard and USB DAC.
The program hangs after a few minutes of use under these circumstances:
1. The onbard default tab in Windows - OK
2. DAC default in windows - pauses
3. Default DAC in windows, RTL output on onboard - pushes

How do you get this carcass to run on board?
Michael

Have you tried to lower the Sample Rate?
For me, he often caught a push already at 2.56 MSPS, and at 2 - 2.4 it flashes OK.

In my case, it happened that something was going through the USB and the donglas lost communication and was just catching a breeze. Sometimes it was enough to hit the stop and play again and he would go, but it was longer or shorter and he was hanging again. It helped to restart the computer. I would like to add that for my computer, such an SDR, it is almost no load, even at max sampling. However, in each computer and with each receiver I have one problem. This is a millisecond audio interrupt. If I didn't set up the VAC and the audio computer, it doesn't help. Sometimes is more often, sometimes rarely, but it always is. It is not a problem for digital data, but all analog images are fragmented, because the program loses synchro. On a laptop, where there is a bare 10, it does not have much that is installed, but it can also interrupt at times.

Dongl is sitting in the USB port, which is loose and chatting. I also had such a problem and the extension cord helped to minimize the movement of the RTL I recommend ...

For me it was not a question of USB, because I kicked them out of the butt and soldered the wires directly to the PCB, because I also thought that maybe something in the connector. Certain programs or anti-virus may certainly cause the suspension.

Please tell me which software will allow you to watch terrestrial TV with the changed photo drivers?
HNY, Michał

SP5IT wrote:

which soft will allow you to watch terrestrial TV with replaced drivers with a picture?

No. DVBT drivers must be used to watch TV.

https://portable.info.pl/progdvb-portable/

On Linux it will go.

https://grylewicz.pl/pingwin-lubi-tv-dvbt-linuksie/

Wow, I don't know what the problem with this shredding of received pictures by fax, sstv, or noaa on a stationary computer: / I fired the antiviral, turned off the net, dozens of changes in the settings of the virtual cable and audio in general and nothing. This is an example of receiving a fax.

I noticed that Louis' DSD since 1.8.3 doesn't decode the voice on NXDN48 and NXDN96 is just gibberish. The older version 1.8.2 still decoded well and the voice was clear and clear. Does anyone still have a problem with this and does anyone know how to solve this problem so that the latest version decodes NXDN correctly? Writing to Louis doesn't get you anywhere because he doesn't answer the questions.

This version is the last to decode voice to NXDN48 and NXDN96.
https://github.com/LouisErigHerve/dsd/tree/7d3b4399531dee59e7219f04b685e9f55e431aed

And this next version is not. And all of the upwards no longer decode NXDN48 and NXDN96 voice purely.
https://github.com/LouisErigHerve/dsd/tree/b01dc12ee1d2aea5ae2fb50466cf4278e4aadd91

Below is a link to the description of the changes.
https://github.com/LouisErigHerve/dsd/commits/master

@don_viking the first two links; not found

Already corrected the links above and they should work.
I am giving them below as well.

This version is the last to decode voice to NXDN48 and NXDN96.
https://github.com/LouisErigHerve/dsd/tree/7d3b4399531dee59e7219f04b685e9f55e431aed

And this next version is not. And all of the upwards no longer decode NXDN48 and NXDN96 voice purely.
https://github.com/LouisErigHerve/dsd/tree/b01dc12ee1d2aea5ae2fb50466cf4278e4aadd91

Below is a link to the description of the changes.
https://github.com/LouisErigHerve/dsd/commits/master

Anyone have any idea what to do to prevent SDRConsole from shredding analog images? The case looks like this, I fired an anti-virus some time ago (although I do not know if it had an impact, because it did not work before) and yesterday I launched SDRSharp to receive pictures from NOAA and Meteor. I noticed that there was only a shift once during pickup. Earlier, it was so choppy on both programs that it would be a pity to talk. I put a check on KF as it will be. There was a nice surprise in relation to SDRSharp, because with FAXs it received correctly, or sometimes there was one skew, on SSTV it finally decodes pictures well, although sometimes it can also occasionally occur with one synchro loss. Unfortunately on SDR Console it's still the same and cuts all analog pictures. I don't know why this is happening, is it a matter of some settings, but what? Below is an example of SSTV reception from SDRConsole with image shifts and SDRScharp, without losing synchro.

Does any of you know an android application that will connect me to the airspy server? The only Questasdr I found crashes when trying to connect to the server

Recently, SDR came out for android, look in google or on github. I tested and on Android 11 in the Xiaomi Redmi Note 9 phone I have, almost everything flashed. There is an option to choose SpyServer, so that's what you mean, because it's an Airspy network.

greetings

That was exactly what it was about

Hi. On a well-known commercial portal, I recently noticed DVB-T tuners with a frequency range extended from the bottom - the limit was lowered from about 480 kHz to 100 kHz. Do they really "go down" so low, or is it just a publicity stunt? Or maybe in the popular ones, with a lower range of 480 kHz, you can also go lower, even to, for example, 20 kHz. I read somewhere that the lower limit can be lowered by feeding the signal from the antenna directly to the pin of the integrated circuit. I'm trying to make an SDR receiver and I'm looking for a device with the widest bandwidth and at the same time budget.

Post the screenshot you are talking about

Here I have such an offer https://allegro.pl/oferta/rtl-sdr-v3-odbiornik-sdr-0-1mhz-1-7ghz-13575795459

megid wrote:

I recently noticed DVB-T tuners with a frequency range extended from the bottom - the limit was lowered from about 480 kHz to 100 kHz.

megid wrote:

I read somewhere that the lower limit can be lowered by feeding the signal from the antenna directly to the pin of the integrated circuit.

In the case of RTL, this is nothing new, it is called Direct Sampling. It is true that the sensitivity of the receiver decreases, but it allows operation from about 10kHz (eg VLF), but in practice there are very large interferences.
I described such a receiver; https://www.elektroda.pl/rtvforum/topic3730066.html and its successor with much better dynamics; https://www.elektroda.pl/rtvforum/topic3944129.html#20352286.

This is a dummy clone of the original RTL-SDR v3. Go to the project page, you'll see what a clone looks like inside. RTL-SDR v3 does not go below 500kHz due to the BiasTee circuit. Everything is explained on the project page. Each of the receivers on the RTL2832 below some 24MHz usually uses the direct-sampling method which is a prosthesis. Buy yourself a good RSP1A clone, you will spend about PLN 300 for a good one and you will have decent reception and better dynamics.

lysy1980 wrote:

Buy yourself a good RSP1A clone

Mine works very well, it's a pity that after switching to linux I can't get it to work, in Win it's much better than RTL.

I haven't used it on Linux. But I think in general it has too much software for Linux just for RSP1A
https://www.sdrplay.com/some-guidance-for-linux-and-gnu-radio-users/

/ /

lysy1980 wrote:

This is a dummy clone of the original RTL-SDR v3. Go to the project page, you'll see what a clone looks like inside. RTL-SDR v3 does not go below 500kHz due to the BiasTee circuit. Everything is explained on the project page. Each of the receivers on the RTL2832 below some 24MHz usually uses the direct-sampling method which is a prosthesis.

Do you have a link to this project page? I looked at the KONEKTOR5000 website, but I can't see much there. I think direct-sampling is also used, although they call 500 zlotys for it. What is the reason for this limitation to 500kHz - is it caused by software or the use of high-pass filters?

Well, as the name suggests - the project is called rtl-sdr can be found on Google.
The connector is a reseller of receivers that really has no idea how it works - just read their descriptions in the store or on Allegro.

rtl-sdr.com

@lysy1980 I have a clone under Linux running GQRX. Dump1090 did not fire because I use RTL-SDR for this.

Hey I have this question. I am currently testing various antennas for SDR RTL. I found a logarithmic-periodic antenna I bought some time ago. The antenna almost new bought from Dipol store It turned out to be a disappointment. I wonder if converting it to a polywave dipole with different arm lengths but joined together. into one antenna . And positioning it vertically, is there a chance for reasonable reception ? I live in an apartment building but located the highest in my town. Having a 2-story attic. And the polywave dipole I made works quite well.
And I will immediately ask
In connection with the dimensions of my attic. I am wondering what to choose, having a choice. Large antennas but placed under the roof and rather normal on the roof.
Digression
Once due to several broadband antennas placed in the attic Piorum blew a hole in the roof 2 times in the same place. Fortunately, the neighbors changed and the new ones do not know about these adventures .

On google find logarithmic antenna calculator

@waniah
But she is directional. I once hooked up to a TV logarithmic dump 1090 and it even picked up something but narrowly. Do you have a specific target or generally for listening because if the latter it's pointless.

For listening I use a set of dipoles of different lengths, properly trimmed for specific frequency ranges. I found on the web some diagrams of dipoles combined into a set. For now I am experimenting.


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