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[Solved] DVB-T + FM + DAB Tuner and HDSDR Program Installation: Maximum Frequency Set at 1.600Hz

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  • #1 17249746
    Anonymous
    Level 1  
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  • #3 17249951
    groxit
    Level 7  
    Posts: 7
    I have the same tuner, I recommend using the replacement, SDR # (SDR Sharp). It works fine for me with this program. When you manage, let me know if you receive anything except VHF and squeaks on all bands (unfortunately I am silent, rather due to thick walls, because my own transmitters receive everything correctly).
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  • #4 17249997
    internick
    Level 36  
    Posts: 3081
    Help: 273
    Rate: 552
    Buddy @groxit, what's your external antenna?
  • #5 17250189
    groxit
    Level 7  
    Posts: 7
    For now, I have a simple two-element self-made stationary at home, it receives much better than this funny antenna added to the set, but inside the house I will not receive much more than the basic VHF and DVB-T from my city. In my spare time I will try to go outdoors with a tablet to scan the entire band in the hope of finding any amateur station. My final goal is to receive an ATV at 1.2GHz, but I won't get it without a super antenna.
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  • #6 17250222
    internick
    Level 36  
    Posts: 3081
    Help: 273
    Rate: 552
    @groxit I don't know if you know, but you either watch DVB-T or upload modified libraries to make it a scanner. Maybe the dog is buried here?
  • #7 17251450
    Anonymous
    Level 1  
  • #8 17251466
    internick
    Level 36  
    Posts: 3081
    Help: 273
    Rate: 552
    I always do this:

    - I am waiting for the drivers to be installed (for 7 I suspect that I need from the disc) [8.1 and 10 it downloads itself].

    - I overwrite them from the Zadig level

    And that's it.

    I configure SDRSharp: https://www.elektroda.pl/rtvforum/topic3182271.html
  • #9 17251527
    Anonymous
    Level 1  
  • #10 17251620
    internick
    Level 36  
    Posts: 3081
    Help: 273
    Rate: 552
    It will work, but you probably have chaff in the system.

    Try to start in SDRSharp, but without that ExtIO ...
  • Helpful post
    #11 17251886
    don_viking
    Level 21  
    Posts: 562
    Help: 14
    Rate: 136
    Hello my colleague norkil20 in the attachment you have a ready program and working in this band as you want.
    DVB-T + FM + DAB Tuner and HDSDR Program Installation: Maximum Frequency Set at 1.600Hz

    And you had this problem, from what I read you did not install the original drivers from the tuner board. After inserting the tuner, you should turn on and install the tuner controls. Then turn on the zadig. Headset for the R820T tuner "setup" and attached. I do not recommend setting such a large reception width because the program may hang. It is best to set 2.4MHz as in the picture below, then the program works more stable. Hope I helped with your problem.

    DVB-T + FM + DAB Tuner and HDSDR Program Installation: Maximum Frequency Set at 1.600Hz

    There is also a question of setting "ppm" frequency shift relative to the signal. In my photo it is "0" , but you have to set it up to receive stations correctly. The description of how to do this is in my manual.
    https://www.elektroda.pl/rtvforum/topic3182271.html
    Attachments:
    • setup.exe (5.43 MB) You must be logged in to download this attachment.
    • zadig.exe (4.92 MB) You must be logged in to download this attachment.
    • HDSDR.rar (1.83 MB) You must be logged in to download this attachment.
  • #12 17323777
    Anonymous
    Level 1  
  • #13 17329982
    don_viking
    Level 21  
    Posts: 562
    Help: 14
    Rate: 136
    Doesn't understand further what you mean when you say your bandwidth is narrow in terms of reception. Whether it's the width (range) seen in the spectrum, the receiving frequency, or the movement across the band. When it comes to the range seen on the spectrum, underneath it you have a slider with the name "ZOOM", there you adjust the visible range. As for the width of the received signal, in the "ExtIO" options you have the option of setting, it is best to give either 2MHz or 2.4MHz. If you want to search for anything in the range set and visible on the spectrum, use the lower counter. Use the upper counter when you want to search out of band. If you still do not know what it is for, you can write to PW, I will try to help if possible.
  • #14 17657187
    flinc
    Level 30  
    Posts: 1530
    Help: 91
    Rate: 150
    For morkil and HDSDR users
    Open ExtIO and set HFDirect Sampling to Qinput
    Frecfency Corection ppm 46 for RTL2832 R820T
  • #15 17658505
    don_viking
    Level 21  
    Posts: 562
    Help: 14
    Rate: 136
    flinc wrote:
    For morkil and HDSDR users
    Open ExtIO and set HFDirect Sampling to Qinput
    Frecfency Corection ppm 46 for RTL2832 R820T


    You only set it like this when you want to listen to KF and you have direct sampling done.
    After ours, you bypass the R820T2 processor and receive it on the RTL2832 chip itself.
    And the ppm is different in each case because it is a frequency shift depending on the frequency of the quartz or generator depending on the model. Also, this setting will always be different after connecting a different tuner.
  • #16 18454273
    Anonymous
    Level 1  
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Topic summary

✨ The discussion revolves around the installation and configuration of a DVB-T + FM + DAB tuner with the HDSDR software. Users report issues with setting frequencies, particularly a maximum limit of 1.600Hz, and suggest using alternative software like SDR# for better performance. Several users share their experiences with driver installation, including the use of ExtIO_RTL2832.dll and Zadig for driver management. There are mentions of external antennas and the need for proper frequency correction settings. Some users express frustration with the tuner's performance and consider the cost-effectiveness of purchasing a dedicated HDSDR tuner instead of modifying existing USB receivers.
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FAQ

TL;DR: Set your RTL2832U/R820T(2) to a 2.4 MHz sample rate; “It is best to set 2.4MHz.” Fix ExtIO and drivers via Zadig so HDSDR stops showing a 1.600 Hz limit and actually receives FM. For Windows 7 users converting DVB‑T sticks to SDR. [Elektroda, don_viking, post #17251886]

Why it matters: This helps you fix driver and ExtIO misconfigurations fast so HDSDR can tune VHF/FM correctly.

Quick Facts

Why does HDSDR show a maximum frequency of 1.600 Hz with my DVB-T stick?

This symptom appears when HDSDR isn’t connected to the RTL stick through the correct ExtIO and driver. Install the tuner’s OEM driver, replace it using Zadig, then use the RTL2832 ExtIO in HDSDR. In ExtIO, set 2.0–2.4 MHz bandwidth for stability. You should then tune 88–108 MHz and see FM peaks. “It is best to set 2.4MHz.” [Elektroda, don_viking, post #17251886]

How do I set up drivers on Windows 7 for RTL-SDR and HDSDR?

  1. Plug the tuner in and allow Windows 7 to install the OEM driver.
  2. Run Zadig and overwrite the driver for the RTL2832U device.
  3. Start HDSDR and select the RTL2832U input via the ExtIO plugin. “I overwrite them from the Zadig level.” [Elektroda, internick, post #17251466]

HDSDR shows the same spectrum peak no matter what frequency I tune. How do I fix it?

Align your tuner’s oscillator. Open ExtIO and adjust PPM correction so a known station sits exactly at its frequency. Use a 2.0–2.4 MHz bandwidth, because very large widths may hang the app. Then select the correct demod mode for the band, such as WFM for broadcast FM. [Elektroda, don_viking, post #17251886]

Should I try SDR# (SDRSharp) instead of HDSDR?

Yes. SDR# is a reliable alternative and a great diagnostic. If SDR# works, your drivers and hardware are fine, and the issue lies in HDSDR or ExtIO. One user reports the same tuner “works fine” with SDR#. [Elektroda, groxit, post #17249951]

What ExtIO settings are recommended for RTL2832U/R820T(2) in HDSDR?

Set the sample rate to 2.0–2.4 MHz for stable operation. Avoid very large widths, which can cause freezes. Calibrate frequency using the PPM control so stations align correctly. “It is best to set 2.4MHz.” [Elektroda, don_viking, post #17251886]

What does HF Direct Sampling (Q-input) do, and when should I use it?

HF Direct Sampling bypasses the R820T(2) tuner and feeds HF directly into the RTL2832. Enable Q-input only for HF after doing a direct-sampling mod. If you enable it for VHF/UHF, you will get silence. “You bypass the R820T2 processor and receive on the RTL2832 chip.” [Elektroda, don_viking, post #17658505]

How do I calibrate PPM in HDSDR?

Tune to a known station and open ExtIO. Adjust PPM until the station’s carrier centers on the exact frequency. Save the value so it applies on restart. “You have to set it to receive stations correctly.” [Elektroda, don_viking, post #17251886]

I only hear squeaks or silence indoors. Is my dongle faulty?

Likely not. Indoor attenuation can be severe. Use a better external antenna and try reception outdoors. A simple two‑element antenna performed far better than the stock one, and indoor results were limited to local VHF/DVB‑T. [Elektroda, groxit, post #17250189]

What hardware is inside my stick, and does it matter for HDSDR?

Many sticks use RTL2832U with an R820T2 tuner and a 28.800 MHz crystal. This combo works with HDSDR through the RTL ExtIO. Some boards include AMS1117 3.3 V regulators and small RF transistors at the input. These parts confirm typical RTL-SDR architecture and compatibility. [Elektroda, Anonymous, post #17323777]

My spectrum looks narrow or frozen. How do I expand or move across bands?

Use the ZOOM slider beneath the spectrum to change the visible span. In ExtIO, set 2.0–2.4 MHz to widen the real-time bandwidth. Use the lower frequency counter to scan within the visible span, and the upper counter to jump outside it. [Elektroda, don_viking, post #17329982]

Is reflashing the RTL2832U worth it to make SDR work?

Unlikely. A shop quoted ~200 PLN to reflash, and the user still couldn’t receive. They concluded it’s not economical and chose to buy a dedicated SDR dongle instead. Driver and ExtIO configuration, not reflashing, typically determine success. [Elektroda, Anonymous, post #18454273]

How do I quickly get FM broadcast stations working in HDSDR?

  1. In ExtIO, set the sample rate to 2.0–2.4 MHz.
  2. Select WFM demodulation and tune within 88–108 MHz.
  3. Calibrate PPM so a known station aligns exactly, then scan the band. [Elektroda, don_viking, post #17251886]

HDSDR still fails after reinstalling everything; what next?

Test with SDR# without ExtIO to isolate driver or hardware issues. Clean up drivers, then reinstall using Zadig before revisiting HDSDR. As one expert put it, “It will work, but you have chaff in the system.” [Elektroda, internick, post #17251620]
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