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

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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #721 15346569
    Anonymous
    Anonymous  
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  • #722 15347928
    mkpl
    Level 37  
    The antenna of beauty. What do the neighbors say? I had a similar one outside my window (on the 3rd floor in a block of flats) and it caused my neighbors quite a stir and curiosity ...
  • #723 15349876
    Anonymous
    Anonymous  
  • #724 15351356
    mkpl
    Level 37  
    I have a similar situation, a block of flats forming a square. 4-floor blocks, but I live on the 3rd floor and I have the antenna on the inside of the square. Slim-jim antenna at a distance of 1m from the wall. I receive on SDR ~ 25km, while communications with trx 10W, I do 20km directly and open the converters within 150km.

    PSP and services are the bases easily from a distance of up to 30 km and mobile max 10 km (they have low power).
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  • #725 15352080
    Anonymous
    Anonymous  
  • #726 15352268
    czakos
    Level 12  
    The antenna has reached the madness is not the largest :) and no reception; / hands drop
    one big noise; / how to check if the antenna is suitable; / I flew at 445 MHz, even and nothing; / the last photo shows a fairly strong signal that appears from time to time, i.e. that it is broadcast but still noises and hum; /
    RTL-SDR - an SDR receiver from a cheap DVB-T tuner on a USB connector RTL-SDR - an SDR receiver from a cheap DVB-T tuner on a USB connector RTL-SDR - an SDR receiver from a cheap DVB-T tuner on a USB connector RTL-SDR - an SDR receiver from a cheap DVB-T tuner on a USB connector
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  • #728 15352339
    czakos
    Level 12  
    Such (nagoya uv 106) or somehow I know that it will not be crazy, but look at the 4th picture there on 169, every now and then someone is transmitting quite strongly also it is not interference and yet I hear the noise and when it gives a hum.
    RTL-SDR - an SDR receiver from a cheap DVB-T tuner on a USB connector
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  • #730 15353581
    czakos
    Level 12  
    I will add that the radio sounds like this doll, but it is on WFM and still hum on the NFM, maybe something is wrong? RTL-SDR - an SDR receiver from a cheap DVB-T tuner on a USB connector

    PS. The antenna cost me PLN 15 :P but I think I'll make a colleague above copper.
  • #731 15354778
    mkpl
    Level 37  
    NFM in which place? because it can be CTCSS (from 20 to at least 120Hz).
  • #732 15355131
    czakos
    Level 12  
    169,072 I have probably uploaded 4 photos earlier - the last one shows the phenomenon in question. But the program seems to work as it should, because at 439,318 I hear the guys talking, now you must wait patiently for the PSP. But what's the deal with waking up at 169 MHz because they are broadcasting something digitally every now and then? Because I don't get it anymore :)
    One more thing in the scanner that the frequencies in the sd sharp colleague Viking set the PSP range and okay scans but as I added another range, i.e. 439.318, it scans either the PSP or the latter and not both at the same time, I mean that I want to subject the found frequencies and that I deleted them and where they are suitable, he stopped and when they finish transmitting it continues to scan, I hope I made myself clear :)
    And which is better if I make a japole or a dipole, I will add that I live in a block, unfortunately, a horseshoe: / balcony for blocks ... And nagoya will be useful as a mobile scanner for sdr touch :) it's just a pity because Uniden with a telescopic antenna caught from the apartment while standing on the windowsill, I know that this is a typical device that is respectful and will perform better than from a tuner. And from another barrel someone heard about "baofeng" scanners, I think that's what it is called.
  • #733 15355620
    Anonymous
    Anonymous  
  • #734 15356283
    don_viking
    Level 21  
    Hello. CZAKOS what you receive on 169MHz I already wrote you a few posts earlier, this is Motorola's DMR digital transmission. You can hear this farting and it's normal. If you want to listen to normal modulation as I wrote earlier, you have to go below 166MHz. Attached is an audio sample of this DMR signal (MOTOTRBO), if you are receiving something like this, there is an emergency signal for sure because they use DMR on this frequency. You can see this signal on the waterfall in the photo.
    RTL-SDR - an SDR receiver from a cheap DVB-T tuner on a USB connector

    And if you ever become interested in digital modulations, I recommend that you look at the topic below.

    https://www.elektroda.pl/rtvforum/topic1562028-510.html
    Attachments:
  • #735 15356461
    ArturAVS
    Moderator  
    Chakos apparently does not reach the colleague that he is receiving DMR. Despite several admonitions to this modulation, he insisted on listening to the analog.
  • #736 15356478
    czakos
    Level 12  
    All :) thank you very much, dont Viking, and how to set it to scan the PSP frequencies that you set me in the frquency scanner and, for example, 439 where the guys transmit and I can hear clearly bodopisalem after PSP this range 439 MHz but as it gives a scan, it only scans PSP unless I click on this 2 position only scans this 2, i.e. when I scan the PSP, I will miss the 439Mhz transmission. best regards

    Added after 5 [minutes]:

    arturavs wrote:
    Chakos apparently does not reach the colleague that he is receiving DMR. Despite several admonitions to this modulation, he insisted on listening to the analog.

    I did not insist on anything but I just explore the secrets of the scanner, i.e. it is crawling. And I understood don_Viking's statement loud and clear ...
  • #737 15356590
    don_viking
    Level 21  
    Just in the "Frequency Scanner" tab, click on "edit scan rangrs", click on the box under the word "guard" and complete the items to the right. You can name it somehow. You enter the frequency - the first 437,000,000, the second 440,000,000, in the same way, you fill in the next windows horizontally, as in the guard row.
  • #738 15361174
    czakos
    Level 12  
    Everything flashes nice, the rest is a matter of the antenna, unfortunately, the Nagoya does not work on the balcony, especially on the windowsill :D but I am not deleting it yet. But my self-made copper wire dipole with a diameter of 2.5 mm is picked up by the PSP like this doll, taxi and railroad. I understand that tubes like the one used by my colleague Kamil will have a better reception? And whether the arms should be sideways or vertical, because now I have horizontal and it is flying. Best regards and thank you for your help, commitment and patience :) Now only experiments with the antenna ...
    The case is still this type of whether this fraquency scanner plugin scans, for example, all the frequencies that I give it for scanning and when it hits the reception, it will stop at the frequency where it transmits or will still scan because I had the impression that it is only a second and skips further. Because now, for example, I listen to only one frequency and I would like to set a few so that the program scans the entered frequencies and at the time of reception you can hear what someone says and after the transmission is finished, he would go back to scanning.
  • #739 15361287
    BOOM i ZONK
    Level 21  
    ummm nagoya is also well suited, on the exemplary GP 1/4 you only need to move away from the wall by at least 1/4 wavelength
  • #740 15361716
    czakos
    Level 12  
    Therefore, I do not delete it yet, I can only set the fraquency scanner to set that when I scan a given frequency, for example 140-150, if I get a reception at 148, I still scan and hear them, for example, with breaks. And my point is to set a few frequencies for scanning and where there is transmission, it stops there after the transmission is finished, it scans further because you can probably set it like that?
  • #741 15362065
    art212
    Level 8  
    Hello, has anyone been listening with the R820T2 on Windows 10? After plugging the dongle into the USB, the computer will only emit the sound of the connected device and the LED is on, but you can not see it at all, nor have the default drivers installed anywhere. Zadig cannot therefore replace the dedicated drivers. There was no such problem in Windows 7.
  • #742 15362254
    Anonymous
    Anonymous  
  • #743 15365562
    art212
    Level 8  
    But you installed original for DVBt reception first? I didn't have a plate in the set ...
  • #744 15376159
    Anonymous
    Anonymous  
  • #745 15377545
    czifeng
    Level 9  
    Hello,
    Colleagues, I just bought this tuner along with the antenna that was included (the small one).
    The reception is practically negligible .. even usually the radio (only 3 stations) I had uniden ubc69xlt before and I received it very nicely. What antenna do you recommend to receive the air band, services and everything cool? ;) I know that if there is something to everything, it sucks, but I don't care about receiving it, you don't know what :) The second thing is when it extracts SDR SHARP zip. it doesn't see my antenna..But when I run the program directly from zip. it's all fine .. Regards!
  • #746 15377638
    Tommy82
    Level 41  
    Well, this antenna from the kit can be used to scratch your head.
    But even on it, FM radio stations can be heard very well.
    This sdr is noise sensitive. Everything in this thread has been described.
    To receive the air band, the dipole is open as at the top of the side at @KamilOc

    I also used this to receive the air band

    http://www.barczak.com.pl/oferta/anteny-radiowe/antena-radiowa-ukf-sv-total.html
    The producer, as it turned out, is close to me.
    I had to shorten both the alu rod and the whip, but it is also the vertical open dipole that can be easily attached to the fairy tale and looks like a radio. There is an amplifier inside and we get rid of it and replace it with another one with a wider bandwidth.

    I used http://www.radioamatoripeligni.it/i6ibe/ads-b/ads-b.htm for ads-b
    in two variants, the first variant was screwed onto a standard dongle antenna (soldered in a brass spacer, the thread fit perfectly).
    The second variant used the same whip but was screwed into the counterweight base. From the first floor, from the balcony within the reach of Katowice, I had Tarnów and a piece of the Czech Republic on very good days, Krosno and Rzeszów, and when it was perfect, it happened that from a large ceiling it came from Ukraine.
  • #747 15384805
    czifeng
    Level 9  
    Ok, I made a dipole from a copper tube 15 (49.5cm) the antenna is positioned vertically. The problem is that I receive the signal every now and then from the 172 MHz band but I only hear noise ... Is it the fault of the program or the antenna? I only receive the air band (131MHz) very well and sometimes the railway, but very poorly (150MHz) RTL-SDR - an SDR receiver from a cheap DVB-T tuner on a USB connector
  • #748 15384823
    mkpl
    Level 37  
    You have too high a gain value and therefore the background obscures the signal.

    Uncheck RTL AGC and Tuner AGC and set the gain to the minimum and increase it until the background noise slightly jumps so that it does not exceed -50 to -55dB and you should hear more.
  • #749 15384970
    ArturAVS
    Moderator  
    Only as I remember correctly it is 49.5 cm, this is a 2m amateur band.
  • #750 15386912
    Jap
    Level 29  
    Hi
    I decided to run SDR on an old laptop with Win XP. And the stairs started because I am not able to install / replace the driver in Zadik for Bulkin interface 0 on WinUSB .... The drivers are installing but after a while another error appears. I would like to add that other drivers - lib type ... that can be selected in the Zadik window install without any problems.

    Anyone have an idea how to solve this?

    I wonder if it's not the fault of the WinXP version.
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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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