Elektroda.com
Elektroda.com
X

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

Ganjor86 622126 1575
This content has been translated flag-pl » flag-en View the original version here.
  • #1
    Ganjor86
    Level 21  
    Hello, I was looking for news about the SDR radio today because I would like to buy one someday and I came across a topic about SDR reception on a DVB-T tuner for about PLN 60. The case is interesting because the costs are low and you can get some experience with SDR and if you get bored you can have a TV tuner. When the tuner is connected as in normal use, you can receive from 64-1700 MHZ and recently someone came up with the idea that if you connect the antenna to the first leg of the RTL2832 chip, you can also receive short waves! Here's the proof:





    A whole lot of other results Link

    Here is a topic on sp7pki Link

    On this forum someone wrote that direct connection of the antenna to the chip can burn the chip and it would probably be so, but if you used to connect the kf antenna, something like in the 83 post Link

    I think that due to the possibilities and the price, the topic is really worth developing. An additional advantage is that you do not need to use a sound card that is integrated on the computer's motherboard is very poor and the cost of buying a better sound card is greater than the DVB-T tuner.
  • #2
    Olek II
    Moderator
    Ganjor86 wrote:
    When the tuner is connected as in normal use, it can receive from 64-1700MHZ


    I haven't come across a DVB-T tuner that has a wider bandwidth like 860MHz. Can you provide the model?
  • #3
    Ganjor86
    Level 21  
    Not only LV5T tv but also a lot of others. In the link I gave to the sp7pki forum there is a specific discussion on this topic.
  • #4
    Olek II
    Moderator
    Technical data
    Not Only LV5T Deluxe tv tuner
    External tuner type
    USB interface
    DVB-T digital terrestrial TV tuner yes
    DVB-C digital cable TV tuner no
    DVB-S digital satellite TV tuner no
    Analog TV tuner yes
    HDTV 720p resolution
    Full cable band
    PAL vision system
    B / G, D / K audio system
    Recording format MPEG 2, MPEG 4
    Analog radio tuner yes
    No input data

    info from the website: http://www.oleole.pl/tunery-telewzyjne/not-only-lv5t-deluxe.bhtml#ixzz22mPQPXK2

    Nowhere does the manufacturer provide such a wide bandwidth. There is a spectrum of terrestrial television everywhere. Above 862 MHz, terrestrial TV does not work.
  • #5
    Ganjor86
    Level 21  
    But if people on another forum managed to get it started like that, maybe I will :)
  • #6
    Olek II
    Moderator
    I do not deny that it is enough to replace the soft one?
  • #7
    Ganjor86
    Level 21  
    The point is that you install sdr software (many people praise hdsdr) and some basic drivers. I don't know exactly how it works yet, but I will for sure find out :)
  • #11
    Ganjor86
    Level 21  
    And what kind of dongle because I heard that one is not equal to the other. And how with tenderness. Have you tried connecting the antenna to the first or second pin of the IC? Apparently, by connecting the sdr antenna there, it starts working on shortwave, but you would have to think about some protection against some surges. Maybe you try to connect a piece of cable there so that the signal is not too strong? I also know that it is possible to connect a small device to such a tuner that will lower the frequencies on which the tuner works by 100 MHz, i.e. to 0 Hz practically :) and is there an option to quickly make an sdr receiver out of such a dongle and then quickly make an sdr receiver again or does it involve uninstalling the drivers and installing new ones, and so every time he wants to change the use of embedding?
  • #13
    Ganjor86
    Level 21  
    Here Link the modification is described as for inputs below 30 MHz in RTL-SDR

    Added after 13 [minutes]:

    Link here a little more and probably more precisely about the operation of the tuner from 0 to 30 MHz and the problem with electrostatic charge is also described. What if you put a variable capacitor between this pin and the antenna? The distances are probably so large that the spark will not jump, and by changing the capacity of such a capacitor and using a long long wire, it would be possible to adjust the signal intensity :) well up? In addition, one switch and such a tuner could operate in two ranges from 0 to 30 MHz and the other range from 64 to 1700 MHz
    And here at 147kHz




    "This video is no longer available because the associated YouTube account has been deleted." / c2h5oh /

    Well, I have to buy something like that.
  • #15
    bogi
    Level 29  
    Does this scanner work for someone on Not Only TV LV5TDelux?
  • #16
    Ganjor86
    Level 21  
    many people work :) type in google model of your dongle and add rtl sdr and look for the answer :)
  • #17
    bogi
    Level 29  
    After reading the above info, I am going to buy Not Only. But I wanted confirmation before purchase that it works.
  • #18
    gilong
    Level 18  
    and could this system be used as a dds generator? what it has to be treated right? I wonder if it is possible to separate the signal from the generator and connect it to another sdr receiver
  • #19
    maryjusz75
    Level 1  
    Hello.
    I have such a tuner (not only) and confirm its use as a broadband receiver. I'm using it to listen. I only have a problem because I can't pick up frequencies around 150 MHz for reasons unknown to me. And these are what I care about the most (lower - 148 MHz and higher - 160 MHz it catches perfectly). I do not know if it is my tuner fault or some error in the settings. When starting up, I used numerous online tips. Anyone have a similar problem? The next hole is around 300 MHz, but that doesn't bother me.
  • #20
    mkpl
    Level 37  
    Gentlemen ... Maybe the name of the system that this receiver is based on?

    Probably leg 1 is the input of the ADC converter (if the IQ demodulation is done by software), and if the hardware is the input of this demodulator, it can be concluded that we are dealing with a typical superheterodyne earlier.

    Security is quite simple. You must first find out what signal levels are there and add either 1 degree on the transistor or possibly give a diode, e.g. 1n4148 from ground to pin and from pin to power, thanks to which we short all electrostatic charges.

    Generally, such a receiver has quite fast analog-to-digital converters, which is its advantage (wide bandwidth of the received signal).

    I personally work out a classic SDR with mixers on NE602 + IF from TV and TV head. It cannot be cheaper and the sensitivity should also be quite decent. The wideband phase shifter by 90 degrees remained to be worked out (solutions on flip-flops fall off because the digital camera is basically only unit jumps with a spectrum that can not occur in the radio)
  • #21
    Ganjor86
    Level 21  
    maryjusz75 wrote:
    Hello.
    I have such a tuner (not only) and confirm its use as a broadband receiver. I'm using it to listen. I only have a problem because I can't pick up frequencies around 150 MHz for reasons unknown to me. And these are what I care about the most (lower - 148 MHz and higher - 160 MHz it catches perfectly). I do not know if it is my tuner fault or some error in the settings. When starting up, I used numerous online tips. Anyone have a similar problem? The next hole is around 300 MHz, but that doesn't bother me.

    As far as you know, if you have a hole, you can't help it :( If I were you, I'd do this: sell this tuner and buy it on Allegro or even better on ebay, another dongle from the R820T has probably only one hole and a wider range of reception. You can find everything in google.
  • #22
    Ganjor86
    Level 21  
    www.wykop.pl/ramka/1341289/rtlsdr-czyli-odbieraj-niemal-wszystko-z-tunera-dvb-t/
    A handful of information for people not very familiar with the topic, there is also a description of installing the tuner on windows and linux in this link.
  • #24
    Anonymous
    Anonymous  
  • #25
    Ganjor86
    Level 21  
    www.sp7pki.iq24.pl/default.asp?grupa=3538&temat=136325 see here :) and if you do not find the information you need, ask in this topic.
  • #26
    bogi
    Level 29  
    I also struggled a bit with the installation under XP. Installation condition
    Microsoft .NET Framework 3.5. It also does not work with the higher version.
  • #27
    Anonymous
    Anonymous  
  • #28
    r03c10
    Level 11  
    And I would like to know what antenna is required to receive frequencies other than 88-108 MHz? I would be particularly interested in the 118-140MHz range. My guess is that an ordinary antenna attached to the LV5TZ, for example, is not enough. Or maybe someone managed to pick up something other than the radio on it? I am asking because in SDR # it elegantly receives FM, but in the remaining bands only noise, even when connected to an external TV antenna.
  • #29
    SP5ANJ
    R.I.P. Meritorious for the elektroda.pl
    Hello.
    r03c10 wrote:
    I would be particularly interested in the 118-140MHz range.

    This should help with the reception.

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

    Quote:
    I am asking because in SDR # it elegantly receives FM, but in the remaining bands only noise, even when connected to an external TV antenna.

    The so-called band TV is not 118-140MHz.

    You can assume that TV antennas have 85% bandwidth above 500MHz.


    Best regards.
  • #30
    zabex
    Level 22  
    Hello. I bought a dongle from the R820T a few days ago and I am pleasantly surprised. On the original antenna I receive FM, air band, ADS-S, NOAA etc ... As these signals are weak, I would like to buy an amplifier like this: http://p.alejka.pl/i2/p_new/42/05/wamplifier -fp-6-l-5-2400-mhz_0_b.jpg and (as I am interested in different bands) to build a Discone antenna.
    Has anyone tested such a solution? How do such antennas work in the case of band reception, e.g. 137-138MHz and ADS-B?