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

Ganjor86 681418 1593
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  • #301 13984288
    BOOM i ZONK
    Level 21  
    Everyone has to answer this question for themselves. In my opinion, the price alone beats all hardware scanners. Another thing is the emissions, you can choose the color ... You can freely set the width of the received signal, you are not tied to one frequency of transformation. And you can see what is happening across the whole band (3.2MHz). Filters, plugins, gadgets, scanners.
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  • #302 13985688
    Thunder6995
    Level 13  
    Well, buddy, you've hit the crux of my thoughts :!:
    I am considering getting a scanner, but only for "fun".
    I was thinking about a certain Yaesu model, because it has many possibilities, but for the pleasure of using SSB etc and the lack of "holes" you have to pay almost a thousand zlotys for a used one!
    I am not saying that the price is unbeatable, because if someone really needs it, he will buy it without hesitation, but if someone else would like to listen only once in a while and without the need to walk with it, as long as SDR will provide the same opportunities then there is nothing to wonder about.
    And to clarify my question - are we able to hear more on a scanner (i.e. a portable, broadband radio receiver) up to PLN 1,200 than on the aforementioned RTL2832U + R820T tuner operating as SDR? :?:
  • #303 13985804
    Tommy82
    Level 41  
    Thunder6995
    Get yourself a RTL2832U + R820T and don't fret ;)
    In practice, it's a few 4-packs.
    Play, figure it out, listen to what's squeaking around. If you find that you need more, you will hit higher. A few nozzles are not money and it really works.
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  • #304 13985902
    Thunder6995
    Level 13  
    And after such an answer, a person realizes that he has stopped thinking rationally and is wondering about some bullshit, as if he had no major problems ;)
    You're right - that's 1/20 of the target price I was trying to get!
    Thank you for the cold rationalism poured out on your head and for effective motivation!
    I warmly greet you!
  • #305 13986112
    Anonymous
    Anonymous  
  • #306 13986162
    Thunder6995
    Level 13  
    My friend I demand - we are very happy that you did something ...
    But seriously - you would write something about it. Any observed conclusions, the frequencies at which you use it, for example a subjective assessment of the reception on the amplifier compared to the circuit without its use, its schematic, just any information :)
  • #307 13986346
    Anonymous
    Anonymous  
  • #308 14003626
    Jezzman
    Level 21  
    A little question from another bag.
    Is it possible to repair the tuner not only tv, the damage lies in the complete lack of signal on various antennas, it does not even receive local radio stations that it received on a piece of wire. Yesterday it worked properly even with an antenna amplifier, today it has already died ...
    The tuner is based on the FC0013 chip and unfortunately it does not have this protective diode on the input.
  • #309 14003728
    lysy1980
    Level 33  
    You need to get FC0013 or soatje you KF pickup using DIRECT SAMPLING
  • #310 14003791
    Jezzman
    Level 21  
    lysy1980 wrote:
    You need to get FC0013 or soatje you KF pickup using DIRECT SAMPLING


    Hmm, replacing FC0013 is not profitable in my opinion because it is better to buy a new tuner. To receive KF I have to redo something or add to this dongle ??
  • #311 14003864
    OK2STO
    Level 20  
    On KF it is best to do a converter, you have to knock on the electrode, there is a schema there, I did s TA 7358 myself and a smirk.
    Jard
  • #312 14003922
    lysy1980
    Level 33  
    Direct sampling is also OK. The converter will not work for Jazzman, because it has a damaged tuner system.
    Jazzman, google the modification I mentioned.
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  • #314 14005413
    TM85
    Level 27  
    Has anyone thought of an MMIC based preamplifier? A few old GIGASETS are falling over me and the receiver was on the receiving path.
  • #315 14005511
    BOOM i ZONK
    Level 21  
    What do you mean by MMIC? This is a symbol ?? Maybe there is some LNA, but it probably has sensible parameters in the frequency range that is not useful for us. And with the documentation of the system, it's hard - MarneSzanse
  • #316 14005577
    TM85
    Level 27  
    MMIC
    http://pl.wikipedia.org/wiki/MMIC
    For example, MAR-3; ERA -2 from Mini Circuits
    It works from DC to a dozen or so GHz.
    Very simple application, good parameters, rated for 50 ?.
    And most importantly, he sits at hand in Gigaset, perhaps similar fleas are somewhere in the LNA SAT.
  • #317 14005677
    BOOM i ZONK
    Level 21  
    Ah I was thinking about the Infineon PMB series. As for MAR, if the plates from mesh antennas work, he can do it.
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  • #318 14007938
    weeb
    Level 11  
    Hello!
    I have a question about the tuner scanner not olny tv.
    When it is connected to a lab with SDR software, whether in the car or at home, you can hear what is happening in the area on the included antenna, while when connected to an xperi or a tablet, you can hardly hear someone nearby, no matter if it's home or car. What could be the reason??
  • #319 14008996
    kriss51
    VIP Meritorious for electroda.pl  
    weeb wrote:
    Hello!
    I have a question about the tuner scanner not olny tv.
    When it is connected to a lab with SDR software, whether in the car or at home, you can hear what is happening in the area on the included antenna, while when connected to an xperi or a tablet, you can hardly hear someone nearby, no matter if it's home or car. What could be the reason??


    When you use a tablet or xperi, the settings in the program are the same as in the laptop? It's about RF-gain (receiver sensitivity). Please check all settings.
  • #320 14010554
    weeb
    Level 11  
    kriss51 wrote:
    weeb wrote:
    Hello!
    I have a question about the tuner scanner not olny tv.
    When it is connected to a lab with SDR software, whether in the car or at home, you can hear what is happening in the area on the included antenna, while when connected to an xperi or a tablet, you can hardly hear someone nearby, no matter if it's home or car. What could be the reason??


    When you use a tablet or xperi, the settings in the program are the same as in the laptop? It's about RF-gain (receiver sensitivity). Please check all settings.


    I did not find w.Sdr on android RF gain is only gain control anyway, there are not many settings there
  • #321 14015892
    agmap
    Level 11  
    Only set Regina's car to the maximum and it will receive strong. It strengthens a bit differently than on a pcet, which is why the car does not work very well.
  • #322 14174939
    oki188
    Level 22  
    Welcome.
    In my area, I have had high interference in the 20 to 30MHz band for a long time.
    Is it possible to use such a tuner that I can connect it to an external directional antenna + netbook and use the set as an antenna analyzer to locate the source of interference?
    Best regards.
  • #323 14177794
    Ganjor86
    Level 21  
    And wouldn't it be better to locate with a small radio and not run with a laptop?
  • #324 14267633
    Daniel_GSM
    Level 25  
    Colleagues how to improve the sensitivity of the receiver?
    I can hear very little :( for example, when it comes to a taxi, I only hear the headquarters and not the cars.
    I have an old Alinco DJ-190 at home and I can hear everyone on a short antenna on it ...
  • #326 14268292
    Daniel_GSM
    Level 25  
    The program is SDRSharp - maybe something needs to be changed in the program?

    I connected the antenna with the Alinco DJ-190. Of course, I can hear everything nicely on the radio and unfortunately not on SDR - only strong stations.
  • #328 14270699
    methyl
    Level 16  
    You shouldn't have such a significant difference in sensitivity.
    SDR RTL is less sensitive because I have various hand towels and scanners myself and I can see it too, but while for SDR you have something that is a relatively effective antenna, the difference between the devices should be felt only in the noise level, but the signal should be received.

    With these sliders for sensitivity in the program setting, you should not overdo it, because the effect will be opposite to the intended one. I suggest that you do not turn on the gain option at all in the "RTL AGC" and "Tuner AGC" fields, because this only results in an increase in noise and deterioration of the noise-signal ratio.

    Slider max at 70-80% and a sensible antenna fired outside the apartment as high as possible.
    A better option than using the amplifier in the "dongl" itself, which has a high level of noise, is to turn the gain in it to a minimum and to attach an appropriate external amplifier, which can be purchased in some electronics stores, "LNA".

    I will also mention that some DVB-T USB receivers do not have ESD protection in the form of a diode at the antenna input. The effect is that after a few games with a longer wire, the receiver circuit breaks down and the sensitivity of the device drops terribly. It should be checked.

    best regards
  • #329 14281199
    OK2STO
    Level 20  
    Hi, for everyone, I found a project for SDR receiver 100kHz- 2GHz s RTL SDR donglem, I found it very well done, it's in magazines:
    http://www.radiosovet.ru/magazine/epe_2014/, numbers 10,11,12, to pursue,
    and it's made to do it and to beginners.
    No. 10 and 11 is technician, 12 is SDR software.

    Jard
  • #330 14286063
    methyl
    Level 16  
    Thanks for the info OK2STO! A really cool project with some nice features.
    Uses the factory USB DVB-T receiver inserted inside.

    I would like to add that the magazines from this year are on the "C2H5Omik" hamster.

    It's worth downloading from some source and watching it.


    By the way, I once promised to check the operation of the converter for ne612 in a system with a signal connection on one leg and connection via an impedance matching transformer, to both inputs of the mixer.
    So in the first case, despite the use of the gain stage on the 1st transistor, it was worse. Weaker signal and more noise. This layout with transformers is very good. A colleague kriss51 in the post "243" posted such an arrangement. I did with a simpler input filter and no high-pass output. I paste the diagram below. Out of the tested ones, this one wins with the signal level and small amount of garbage.

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

    In the picture, the power supply of the chip is simplified to such an extent that I forgot about the 3rd leg (mass). I am writing so that there are no misunderstandings :D

    The second thing. If you want to have a clean listening session to the HF, then you must have a narrow preselector at the input, or instead of a low-pass filter, you need to provide switchable bandpass filters. Otherwise, unmerciful muck. On the 80, without the preselector, I only have clamor and distortions. After tuning with the antenna preselector, I have stereo ;)

    Preselector I recommend this:

    http://sp-hm.pl/attachment.php?aid=6802

    As for the simplicity of execution, it is divine and not only my opinion.

    Best regards !
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Topic summary

The discussion revolves around the use of RTL-SDR (Software Defined Radio) receivers, specifically utilizing inexpensive DVB-T tuners like the RTL2832U and R820T models. Users share experiences regarding the capabilities of these tuners to receive a wide range of frequencies, including AM, FM, and shortwave bands. Concerns about potential damage to the tuners when connecting antennas directly to the RTL2832 chip are raised, along with suggestions for protective measures such as using diodes. Various software options for SDR, including SDR# and HDSDR, are discussed, along with installation issues and driver compatibility. Users also explore antenna options, modifications for improved reception, and the effectiveness of different setups for receiving signals across various bands.
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