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

Ganjor86 681049 1593
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  • #1082 16253136
    PalomaBlanka
    Level 10  
    Attached are screenshots of the SDRSharp software that I have used so far.
    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


    I tested the SDRSharper application you posted. Works OK.
    It did not require any configuration. Sound quality good.
    I do not know if there was better wave propagation today, but in those places that yesterday on SDRSharp I heard gibberish, here the sound quality is fine.
    Interestingly, I heard AntyRadio in good quality on 22MHz frequencies, and other radio stations nearby.
    One drawback, I do not see the scanner I like to use.
  • #1083 16259679
    Hajna
    Level 24  
    Well, unfortunately in SDRSharper. no scanner or plugin but there is Vfo and you can quickly switch between the 3 frequencies. In the picture of my SDR they are harmonics from the EC Zabrze chimney RTL-SDR - an SDR receiver from a cheap DVB-T tuner on a USB connector where there are a lot of transmitters and I have 500 m to the chimney. How can you, insert your SDR file because it's nice with plugins, maybe it will be helpful for other users.
  • #1084 16265990
    don_viking
    Level 21  
    This problem with harmonic distortion can be slightly reduced. It is enough to reduce the gain to almost the minimum in the tuner settings and turn off the AGC, and instead install an appropriate external amplifier with a bandpass filter at the antenna. This way I eliminated most of the harmonic distortions from the fm band. To eliminate computer and power interference, I recommend a HUB with external power.
  • #1085 16268339
    Hajna
    Level 24  
    don_viking thanks for the advice, but you already helped a lot in my posts and not only but also in this forum for which I am grateful to you. These harmonics do not bother me too much, because I turned them off in the scanner, but PalomaBlanka could make his SDR available because it has a very extensive one and it costs nothing, unless it has some mysterious powers. And we are here to help each other.

    Added after 25 [minutes]:

    don_viking I can insert SDR, DSD, Virtualkable, and other files that are helpful to max RTL dongle usage.
  • #1086 16269504
    don_viking
    Level 21  
    I think that there is no point in uploading files that I have shared in another topic and duplicating them at the same time. Just share a link to that topic and it is always visible under my posts. There are also links to pages with plugins provided at the bottom, so you can expand sdrsharp yourself as much as you want and you do not have to ask anyone. Below is a link to my manual.
    SDR tuner as a scanner. - Basic settings and configuration.

    And plugins for the older version of sdrsharp 13 I posted a post in this topic # 820
    I will also add that in this topic I have included a lot of attachments to the tuner, so I recommend reading the topic to all beginners in the use of the sdr tuner.
    Best regards.
  • #1087 16281370
    PalomaBlanka
    Level 10  
    On request @Hajna I post my 7zip compressed version of sdrsharp.
    Sorry to be late, but I had other activities.
    The application is very extensive with add-ons and I did it just to test them. Because, for example, two scanning plugins are not needed in most cases. I just "watched" some plugins because I don't even know how to use them.
    Please, if someone uses the extended version, it will be nice.
    However, I believe that it is better like @don_viking noticed, download and configure the necessary plugins himself.
    The general rule that applies to almost all of them is after copying the dll, add the appropriate line in the Plugins.xml file, which we do in Notepad or another text file editor, eg Notepad ++.
    You have to remember to read the Readme file attached to the plugin and the information on the download page, these are obvious things, but due to the fact that not all are advanced who try to play with sdr, it is worth remembering.
    I will not be smart because I am also a beginner.

    I have a question on which frequency range it is easiest to hear a decoded voice. I mean checking the dsd, because at the moment it decodes me with errors or in the ranges where the frequencies are encrypted, you know, I won't hear anything sensible.
    Attachments:
  • #1088 16281412
    Hajna
    Level 24  
    Similarly, I haven't heard anything from PalomaBlanka, but it shows the channel and, for example, Nd12009-9, everything is encrypted, so far I don't have a dongle because my neighbor borrowed it but he already ordered it because he was also listening.
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  • #1090 16283805
    PalomaBlanka
    Level 10  
    Popróbowałem na najbliższym SR7LDD działający TX: 438,2250 MHz
    Natomiast RX: 430,6250 MHz cisza, ale pewnie krótko słuchałem.
    Niestety sypie błędami:
    Quote:
    +DMR slot1 BS DATA ERR3 DCC=5 MBC Header ERR11 ECC FAIL
    +DMR CACH ERR slot2 BS DATA ERR3 DCC=12 PI Header ERR11 ECC FAIL
    +DMR CACH ERR slot1 BS DATA ERR3 DCC=1 PI Header ERR13 ECC FAIL
    +DMR slot1 BS DATA ERR3 DCC=1 PI Header ERR14 ECC FAIL
    +DMR slot1 BS DATA ERR3 DCC=12 PI Header ERR11 ECC FAIL
    +DMR CACH ERR slot2 BS DATA ERR3 DCC=5 MBC Header ERR14 ECC FAIL
    +DMR CACH ERR slot1 BS DATA ERR3 DCC=5 MBC Header ERR12 ECC FAIL
    +DMR slot1 BS DATA ERR3 DCC=5 MBC Header ERR14 ECC FAIL
    +DMR slot1 BS DATA ERR3 DCC=1 PI Header ERR12 ECC FAIL
    +DMR CACH ERR slot2 BS DATA ERR3 DCC=12 PI Header ERR14 ECC FAIL
    +DMR CACH ERR slot1 BS DATA ERR3 DCC=1 PI Header ERR14 ECC FAIL
    +DMR CACH ERR slot2 BS DATA ERR3 DCC=1 Idle ERR26
    +DMR slot1 BS DATA ERR3 DCC=1 PI Header ERR14 ECC FAIL
    +DMR CACH ERR slot2 BS DATA ERR3 DCC=12 PI Header ERR15 ECC FAIL
    +DMR CACH ERR slot1 BS DATA ERR3 DCC=1 PI Header ERR11 ECC FAIL
    +DMR slot1 BS DATA ERR3 DCC=1 PI Header ERR10 ECC FAIL
    +DMR slot1 BS DATA ERR3 DCC=12 PI Header ERR13 ECC FAIL
    +DMR CACH ERR slot2 BS DATA ERR3 DCC=12 PI Header ERR11 ECC FAIL
    +DMR CACH ERR slot1 BS DATA ERR3 DCC=1 PI Header ERR12 ECC FAIL
    +DMR slot1 BS DATA ERR3 DCC=1 PI Header ERR12 ECC FAIL
    +DMR slot1 BS DATA ERR3 DCC=1 PI Header ERR11 ECC FAIL
    +DMR CACH ERR slot2 BS DATA ERR3 DCC=1 PI Header ERR14 ECC FAIL
    +DMR CACH ERR slot1 BS DATA ERR3 DCC=1 Idle ERR33
    Sync: no sync

    Zdekodowany sygnał ma taką postać jak w załącznikach.
    Powstają również pliki z rozszerzeniem src lecz nie mogę ich dodać. Forum zabrania.
    Attachments:
  • #1091 16285320
    internick
    Level 36  
    @PalomaBlanka record a file with properties: .wav (PCM in plugin), 48kHz, 16-bit, mono.

    I mean what's humming, or the "raw" output of the drive that you are listening to.

    Use the AudioRecorder plugin as a tool. You set all options under the Configure button. You set the storage location by selecting Folder Select.

    Just let this file be a little MB, i.e. it comes from a listening session lasting more than 30 seconds.

    If you have a scanner plugin, add more interesting ranges and check what's up in the grass: https://docs.google.com/spreadsheets/d/1M34el...Udz_XY1YRo/pub?single=true&gid=51&output=html
    Attachments:
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  • #1093 16307037
    PalomaBlanka
    Level 10  
    internick wrote:
    @PalomaBlanka record a file with properties: .wav (PCM in plugin), 48kHz, 16-bit, mono.

    I mean what's humming, or the "raw" output of the drive that you are listening to.


    I have recorded the files as mp3. In wav format, even with short listening sessions, I got from 1 to 2GB!
    After all, such files cannot be attached.
    If mp3s are not suitable, I will shorten the ones in wav format, for example cutting out the silence.
    Attached are two of today's mp2 files
    Attachments:
  • #1096 16307805
    internick
    Level 36  
    @PalomaBlanka is supposed to be WARKOT (read: BRUM) what the repeater outputs at the output, not the voice from the decoding.
  • #1097 16308353
    PalomaBlanka
    Level 10  
    I think it will be ok now.
    I am attaching wav files with a bruum drone.

    By the way, I have questions:
    01. What can the recorded baseband be useful for, not the audio itself.
    02. I wanted to install and run another instance of SDRSharp (without unnecessary extras). Unfortunately, the application does not see the dongle. Should I reload the drivers? Will the old version also work then?
    03. I have many frequencies and ranges entered in the Frequency Scanner, can I copy it to this new installation and how?
    Attachments:
  • #1098 16308372
    internick
    Level 36  
    It's better, but still not as it should be:

    "Input file is not a 48 kHz or 96 kHz .wav file
    WAV header processing error - aborting "
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  • #1099 16309384
    PalomaBlanka
    Level 10  
    Is this what the output files should look like? Attachment.

    I think so. Hear what they say!
    However, I hear with noises on the headphones. Can it be eliminated and how?

    How did I do it?
    I started a new installation of SDRSharp. I have installed a minimum number of plugins.
    I don't know why DSDPlus is not visible in the tabs now, I have to start manually from the "sdrsharp-x86" directory.
    On the old, extended version, I reviewed all SDRSharp, Virtual Audio Cable and Windows directories related to sound, but the resulting files appeared to me in such quality - 37500 Hz / 16-bit / 2 channels.

    Is it OK?
    Attachments:
  • #1100 16312544
    internick
    Level 36  
    There is no way to judge it. Maybe it can be better. May not. Record me what I am asking you for. It will at least see how many bugs you have.
  • #1101 16314514
    BOOM i ZONK
    Level 21  
    Use the AudioRecorder quoted by internick a few posts above. But it probably doesn't work with the new versions of SDRSharp, so use the older one, for example: THIS
  • #1102 16315681
    don_viking
    Level 21  
    Or simply while running DSD Plus you click the letter R while holding the shift key. To finish the recording, do the same, click R while holding shift. The recorded file is in the DSD Plus directory as wav. The description in the program window can be seen in the attached photo, it is about the last two lines of the entry start and end of recording.
    RTL-SDR - an SDR receiver from a cheap DVB-T tuner on a USB connector
  • #1103 16320681
    PalomaBlanka
    Level 10  
    As of today, the signal from the converter is decoded by DSD + as the result files, I attach:
    03_DSD-test
    02_DSD_dmr02
    These files can be listened to later. So OK? However, I do not always hear decoded conversations during the listening session. Should it be like that? Is the quality of the attached recorded calls good?


    AudioRecorder saves files in the format recommended by @internick, i.e. wav, PCM, 48kHz, 16-bit, mono I attach a sample
    01_AudioRecorder 19-32-29 Unknown 438.225 MHz
    The file is encoded. Is it supposed to be like that? AudioRecorder should save the raw file?

    I noticed that there is often a frequency shift after the dongle is turned on and warmed up. Of course I correct it, as it had a big impact on the quality of the broadcasts listened to. Should it be so, that corrections are made each time it is started?

    The decoding problem seems to be resolved. On this repeater, which I listened to, transmissions are not very frequent, I was limited in time, that's why I wrote so rarely.

    Please explain what is this signal emitted by the relay, which lasts a few seconds and its representation in the terminal window looks like it is on.
    Quote:

    DSD + 1.101pt
    wav / mp3 file generation interval = 0 minutes
    Enabling output audio AGC
    Setting unvoiced speech quality to 3 waves per band
    Scaling factor set is 64
    Damping level set is 10
    Viewport size set is 20
    MP3 ABR set is 15 kbps
    Source audio waveform window origin set to (10,10)
    Source audio waveform window dimensions set to 200x300
    Source audio waveform window update period set to 100 ms
    Event log window origin set to (50.50)
    Event log window dimensions set to 400x500
    The event log window font height set is 15
    Channel window origin set to (90,90)
    Channel window font height set to 15
    Appending synthesized audio to file 'DSD_dmr02.wav'
    12 radio records loaded
    2 group records loaded

    audio input device # 1 = 'Line 3 (Virtual Audio Cable)'
    audio input device # 2 = 'Microphone (Realtek High Defini'
    audio input device # 3 = 'Line 1 (Virtual Audio Cable)'
    audio input device # 4 = 'Line 2 (Virtual Audio Cable)'

    audio output device # 1 = 'Speakers (Realtek High Definiti'
    audio output device # 2 = 'Line 1 (Virtual Audio Cable)'
    audio output device # 3 = 'SAMSUNG (High Definition Audio'
    audio output device # 4 = 'Line 3 (Virtual Audio Cable)'
    audio output device # 5 = 'Line 2 (Virtual Audio Cable)'

    audio input device # 1 (Line 3 (Virtual Audio Cable)) initialized
    audio output device # 1 (Speakers (Realtek High Definiti) initialized

    D-STAR decoding enabled
    NXDN4800 decoding enabled
    NXDN9600 decoding enabled
    DMR / MotoTRBO decoding enabled
    P25 Phase 1 decoding enabled
    X2-TDMA decoding enabled
    ProVoice decoding enabled

    Mono audio decoding initiated; press Esc to exit ...
    Sync: + DMR
    + DMR CACH ERR slot1 BS DATA ERR1 DCC = 1 Idle
    + DMR CACH ERR slot2 BS DATA ERR3 DCC = 4 TLC
    Sync: + DMR
    + DMR slot1 BS DATA ERR3 DCC = 1 PI Header
    Sync: + DMR
    Sync: + DMR
    + DMR CACH ERR slot1 BS DATA ERR3 DCC = 1 Idle
    Sync: + DMR
    + DMR CACH ERR slot1 BS DATA ERR1 DCC = 1 Idle
    Sync: + DMR
    Sync: + DMR
    + DMR slot2 BS DATA ERR3 DCC = 8 Rate 1 Data
    Sync: + DMR
    + DMR slot2 BS DATA ERR3 DCC = 8 PI Header
    Sync:+DMR
    +DMR CACH ERR slot1 BS DATA ERR3 DCC=9 Voice Hdr
    Sync:+DMR
    +DMR CACH ERR slot1 BS DATA ERR3 DCC=13 Rate 3/4 Data FEC FAIL
    Sync:+DMR
    +DMR slot1 BS DATA ERR3 DCC=11 Voice Hdr
    Sync:+DMR
    +DMR slot2 BS DATA ERR3 DCC=5 MBC Header
    Sync:+DMR
    +DMR CACH ERR slot1 BS DATA ERR3 DCC=4 Data Header
    Sync:+DMR
    +DMR CACH ERR slot1 BS DATA ERR2 DCC=1 Idle
    Sync:+DMR
    +DMR slot1 BS DATA ERR3 DCC=6 Voice Hdr
    Sync:+DMR
    +DMR CACH ERR slot1 BS DATA ERR2 DCC=5 MBC Header
    Sync:+DMR
    +DMR CACH ERR slot1 BS DATA ERR3 DCC=13 TLC
    Sync:+DMR
    +DMR slot2 BS DATA ERR1 DCC=1 Idle
    Sync: no sync
    Sync:+DMR
    +DMR CACH ERR slot1 BS DATA ERR3 DCC=13 Rate 3/4 Data FEC FAIL
    Sync: no sync
    Attachments:
  • #1104 16337670
    kamilalek1
    Level 13  
    I am looking for a sensitive sdr receiver
    While browsing aliexpress, I found two receivers
    https://pl.aliexpress.com/item/Best-RTL-SDR-r...micro-R820t/32722511183.html?isOrigTitle=true
    and
    https://pl.aliexpress.com/item/100KHz-1-7GHz-...M-FM-DSB-LSB-CW/32650041997.html?isOrigTitle= true

    What is the difference between them and is it worth paying almost $ 15 more for this expensive model?
    Alternatively, what other receivers you recommend, I mainly care about the band from 225kHz to 180mHz or up to 500MhZ
    If the device also had a signal broadcasting function, it would be great

    Moderated By c2h5oh:

    Regulations point 3.1.18. Do not send links that will cease to be active after some time. This will make the discussion meaningless.

  • #1105 16337690
    lysy1980
    Level 33  
    You provided links to toys, the topic of which was discussed in one of the posts of this topic, they do not differ in any way from the receiver-toys which is mentioned in this whole topic.
    You are looking for a sensitive, stable and professional SDR receiver and if you still want to transmit, prepare a few hundred dollars. If not, get yourself a converter or use the DS method for a receiver for several dozen zlotys and you have the same what you want to buy.
  • #1106 16337797
    kamilalek1
    Level 13  
    I am willing to pay up to $ 200 for broadcastable SDR or up to $ 100 for non-broadcast SDR.
    Will I get something in this price range or should I get more USD.
  • #1107 16337803
    lysy1980
    Level 33  
    I haven't been familiar with the topic lately, but it seems to me that "forget". 300 + $ for the receiver itself in the form of a KIT will probably be. Rather, without such a frequency span.
  • #1109 16337873
    lysy1980
    Level 33  
    Interesting enough and I think the price is OK. But ... it's 99% Chinese clone, because HACK RF is probably open source and open hardware. In DE it costs over 350E.
    It also seems to me that a BTS GSM simulator can be made on this.
    The disadvantage of Chinese clones is one thing, you never know what quality they used passive elements, and whether the active elements are not coming from production line rejects. Another thing is that Aliexpress can include such faults in terms of quality that it's a waste of words, the only advantage is that after proving that you bought a crap other than in the photo or in the description, you can get a refund of the entire sum or part of it. It is harder to prove functionality inconsistent with the description, because the fact that it perceives worse than the original is not an argument, but it does.
  • #1110 16346739
    internick
    Level 36  
    PalomaBlanka wrote:
    ... Is the quality of attached recorded calls good? ...


    No, there are tons of bugs in the broadcast.

    Some of them are certainly due to the fact that radio amateurs cannot get along by themselves. And they ask to increase the power of the radio in order to understand the interlocutor.

    And the second reason is that the signal is too loud in your VAC.

    In the old DSD you can see the% and if it should be 7-8%, you have 15-16%.
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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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