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

Ganjor86 685426 1593
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #331 14297413
    mkpl
    Level 37  
    Had a goodness multiplier so active? It should definitely improve the signal quality.
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  • #333 14301824
    methyl
    Level 16  
    Maybe the picture shows the operation of the preselector more clearly.
    80M band. antenna LW + Un-Un 9: 1 yesterday, around 20?

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

    Without the preselector, the reception of the 80 would be impossible for me, except with a narrow bandpass filter.
    I don't think I need any further comment :D


    The most important thing is to power the computer from a transformer power supply !!
    Power the converter from an akku / battery or a transformer power supply !!
    Give preselector or bandpass filters!

    There are a few other "tricks" but these are the most important.

    All these things change the listening experience tremendously, especially low frequencies.
  • #334 14307160
    mkpl
    Level 37  
    Interesting this idea with winding the air coil as a toroid.
    It works fine for you until I envy ... my receiver is breaking something (disconnects in the system) ...

    An interesting trick is to make a coupled choke for the power supply and separately for the signal lines. Then the problem of computer and power disappears :)

    I also recommend such a layout.
    RTL-SDR - an SDR receiver from a cheap DVB-T tuner on a USB connector

    It allows you to adjust the preselector bandwidth in a wide range and attenuates it practically to zero (the preselector in the passband does not attenuate the signal).
  • #335 14307271
    methyl
    Level 16  
    What did I use to get a relatively clean signal on the HF?
    I could not get around the computer from the transformer power supply.
    I used to combine with chokes, filters, power distribution, mass distribution and it gave a lot, but the change of power supply to the computer gave more without all these filtration.

    The muck went on USB data cables and these cannot be filtered. After winding a few coils on the ferrite, the transmission failed. It muffled everything :D

    Now I fight with antennas on the roof, I test various configurations and matching and tuning systems to improve the signal strength, especially its relation to noise, which is more important.

    Aaaa, when you pack the USB dongle into one can with the converter, both sections must be shielded well. Give the signal with a concentric. Supply voltages not from USB, but externally and block HF condoms and chokes.

    Otherwise, the muck generated by the USB dongle will go to the converter and make a noise.
    In the donglu itself there is also the possibility of tuning to reduce interference.

    best regards
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  • #336 14309935
    mkpl
    Level 37  
    Quick idea. Raspbery + TV card and all powered by a linear power supply.
    I will have a moment to check this set.
    The advantage of such a system is that we give the whole thing directly to the antenna and send the signal via wifi
  • #337 14322214
    Jezzman
    Level 21  
    Gentlemen, I have a little question.
    I have a receiver on the R820T and a slightly strange problem, when I use an SDR connected to a laptop or stationary, a certain frequency is received without any problems on a regular telescopic antenna, and the same set is connected to the tablet via a USB OTG cable and the SDR Touch application and the same unfortunately the frequency is no longer picking up. Is there any way to improve this "gadget" so that it can receive on a tablet as on a desktop computer?
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  • #338 14331881
    OK2STO
    Level 20  
    This is how I made this receiver from the magazine, from what I found in the basement, I did it a little, the coils tuned at the input classic, almost toroids, also classic tunes are 7812 and 7805, at the UHF input they are a potenciometer as an attenuator,
    I did mix as my colleague Methyl wrote above.
    The receiver is blinking, only 0.5 - 2.0 MHz is lower sensitivity.
    Jard

    Added after 1 [minutes]:

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  • #339 14338250
    tepek
    Level 12  
    This set-top box from China came to me today, SDR works, but I would like to check how it receives TV. Could someone post a link to the software?
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  • #341 14338450
    lysy1980
    Level 33  
    If you didn't get the board in the set, you can use PROG DVB 6 or newer for viewing, or Splash Lite, of course after installing the drivers that are included somewhere in this thread.
  • #345 14339923
    tepek
    Level 12  
    Hmm the cheapest adapter with shipping 18 PLN. All in all, I am in no hurry and I ordered from China (aliexpress.com) for one dollar; Mr.

    And while waiting for the adapter ... this attached antenna is worth nothing, I thought to cut the cable and connect it to the antenna cable. Will it be an exam?
  • #346 14339947
    kriss51
    VIP Meritorious for electroda.pl  
    tepek wrote:
    this attached antenna is worth nothing, I thought to cut the cable and connect it to the antenna cable. Will it be an exam?


    Of course, there will be a much better antenna on the roof with an amplifier than the one included in the set. Unless you live very close to the transmitter, you will pick up something there. The original antenna works like you would attach a piece of wire instead of it.
  • #347 14340113
    lysy1980
    Level 33  
    What you write about will do the exam. The antenna from the set is not bad, I personally used it for some time in my new home on the RG174 cable at a distance of about 20 km from the transmitter (RTCN PIASKI) with an LCD TV and received all MUXes without any problems. At work, I sometimes use this antenna with a USB tuner, it also works without problems, the distance from the transmitter is about 25 km.
  • #349 14340234
    lysy1980
    Level 33  
    Do you know that if you have drivers for SDR reception installed, the TV will not work?
  • #351 14340425
    tepek
    Level 12  
    lysy1980 wrote:
    Do you know that if you have drivers for SDR reception installed, the TV will not work?

    I know and I've already dealt with it. After uninstalling the drivers from sdr, disconnect the decoder before restarting the computer. After the reset, install the original drivers first, and then connect the decoder (I did the opposite, so windows 8.1 installed some own drivers that did not work.)
  • #352 14353915
    darek89a
    Level 9  
    Hello, I have a question, how to play stations in the AM band on the DVB-T LV5TDelux tuner, I installed the sdr sharp program, but I only catch FM stations there
  • #353 14354302
    lysy1980
    Level 33  
    What do you mean when you write AM stations? The range of long and medium waves?
    AM is not a band, but a kind of modulation. It can be used, for example, on long and ultra-short wavelengths.
  • #354 14354310
    darek89a
    Level 9  
    These are commercial stations that can be caught on an ordinary radio
  • #355 14354377
    lysy1980
    Level 33  
    It is not possible without the purchase or construction of an appropriate converter, appropriate antenna and installation of drivers and software for SDR reception.
  • #356 14354426
    darek89a
    Level 9  
    drivers and program I have a DVB-T LV5TDelux tuner for sdr and how to make such a converter and how to connect to the tuner
  • #357 14354445
    kriss51
    VIP Meritorious for electroda.pl  
    darek89a wrote:
    and how is such a converter made and how to connect to the tuner


    Connect the converter to the power supply, its input to the antenna, and the output to the DVB-T antenna input. There are many converter diagrams in this topic and in general on the web.
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Topic summary

The discussion centers on using inexpensive DVB-T USB tuners, particularly those based on the RTL2832U chipset combined with various tuner modules like the R820T and E4000, as software-defined radio (SDR) receivers. These devices, originally intended for digital TV reception, can be repurposed for wideband SDR reception from approximately 25 MHz up to 1.7 GHz, covering amateur radio bands, FM broadcast, airband, ADS-B, and more. Modifications such as direct antenna connection to the RTL2832U chip pins enable reception of lower frequency bands (below 30 MHz), including shortwave, though precautions against electrostatic discharge and signal surges are necessary. Upconverter circuits based on chips like LA1186, LA1185, and TA7358AP are commonly used to extend reception down to HF and VLF bands by frequency shifting signals into the tuner's range. Various software solutions including SDR# (SDR Sharp), HDSDR, and dump1090 are recommended for Windows and Linux platforms, with driver installation often requiring tools like Zadig to replace default DVB-T drivers with RTL-SDR compatible ones. Users report challenges with driver installation, device recognition, and antenna selection, especially for frequencies outside the FM broadcast band. Amplifiers such as the FP6L and antennas like Discone or long wire are suggested to improve reception quality. Mobile and embedded platforms like Raspberry Pi and Android devices with USB OTG support are explored for portable SDR setups. The community shares detailed schematics, installation guides, and troubleshooting tips, emphasizing the cost-effectiveness and versatility of RTL-SDR dongles for radio experimentation and monitoring.
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