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

Ganjor86 716044 1593

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Can I turn a cheap DVB-T USB tuner into an SDR receiver, and how can I make it receive shortwave too?

Yes: with an RTL2832U-based DVB-T dongle you can use it as an SDR receiver after replacing the stock DVB-T drivers with the prepared Zadig/libusb drivers and running SDR software like SDR Sharp or HDSDR [#11182116] In normal mode these tuners work roughly from 24 MHz up to about 1700 MHz, so VHF/UHF services, airband, CB, ADS-B, etc. are fine [#13168529] [#12073526] For shortwave below that range, do not connect the antenna straight to the RTL chip; direct sampling is possible but is considered risky and can damage the RTL28xx [#12073526] The safer and better-performing solution in the thread is an upconverter on the antenna input, e.g. based on TA7358/LA1185/LA1186, which users report can extend reception down to roughly 100 kHz–40 MHz [#13135481]

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#1591 21336401 06 Dec 2024 22:01

Gismot Gismot

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Post #1591
21336401 06 Dec 2024 22:01

SDR RECEIVER Tuner Model: RSP1C
.

After connecting to the computer in the device manager, the tuner is detected. Windows has installed the drivers itself.
fe .

Replace drivers with Zadig software: .

.
On the available guides in the device selection are:
Bulk-In, Interface (Interface 0)
Bulk-In, Interface (Interface 1)

It is not available. So I selected Unknown Device #1

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Then I downloaded the sdrsharp software. .
I clicked on the file: install-rtlsdr
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The program does not detect the tuner:
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https://www.elektroda.pl/rtvforum/topic3182271.html
.

The next steps taken were:
- installation of the tuner drivers
https://www.elektroda.pl/rtvforum/topic4033245.html
tuner still does not work, Zadig does not detect it as Bulk-In, Interface (Interface e.g. 0)
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#1592 21336436 06 Dec 2024 22:25

rosomak19 rosomak19

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Post #1592
21336436 06 Dec 2024 22:25

Gismot wrote:
Windows itself installed the drivers.
.
Perhaps here you have the answer , was to cancel and install ZADIG
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#1593 21336481 06 Dec 2024 22:49

Gismot Gismot

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Post #1593
21336481 06 Dec 2024 22:49

I have removed the drivers:
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Installation using Zadig:
<br/span> .

Same effect, the program does not detect the tuner.
#1594 21336675 07 Dec 2024 06:00

ArturAVS ArturAVS

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Post #1594
21336675 07 Dec 2024 06:00

SDRPlay is not RTL-SDR. You need a properly crafted version of SDR Sharp. There is one on the forum somewhere, by the way, I'll check with myself later. Which Windows?

Windows 7 Ultimate;

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Attached is the Sharp SDR version for RSP and the corresponding Zadig. Run by clicking on the SDRSharp.exe file. You can also use SDR Console v3, the best is the dedicated SDR UNO program for the original RSP. This version of SDRSharp also works on Win10 32/64 bit (W7 also), on others I have not checked. You have a description of SDRPlay here; https://www.elektroda.pl/rtvforum/topic3944129.html#20352286 From the pictures I found on the web, it looks like your version does not have a static protection diode on the input. If you have an antenna that is not shorted for DC then you can damage the receiver (I damaged mine like this for the 0-30 MHz band).

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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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FAQ

TL;DR: A US$13 RTL-SDR dongle with an R820T tuner covers 24-1762 MHz “Band 24-1762 MHz (no holes)” [Elektroda, zabex, post #12073526] and can be pushed to ≈100 kHz with a 50 MHz up-converter [Elektroda, sb8gapi, post #13074101]

Why it matters: One stick lets hobbyists scan HF, VHF, UHF and ADS-B without big radios.

Quick Facts

• R820T native span: 24–1762 MHz [Elektroda, zabex, post #12073526] • Direct-Sampling mod: ≈0.1–28 MHz [Elektroda, methyl, post #13657048] • Typical dongle cost: US$13–15 incl. whip [Elektroda, Ganjor86, post #12076142] • PC spec: USB 2.0 + ≥1.2 GHz CPU [Elektroda, Serwis1, post #13206155] • TA7358 up-converter parts ≈ PLN 15 [Elektroda, sb8gapi, post #13074101]

What frequencies can an un-modified RTL-SDR with R820T cover?

About 24 MHz to 1.76 GHz without gaps [Elektroda, zabex, post #12073526] That spans airband, AIS, ACARS, ADS-B, VHF FM, UHF trunked, LTE and more.

How do I install drivers on Windows XP?

Plug dongle, let Windows load Realtek driver.
Run Zadig v2.1 XP, Menu → Options → List All Devices, choose "Bulk-In Interface 0".
Click Install WINUSB driver. After 5 s SDR# sees “RTL-SDR/USB”. [Elektroda, lysy1980, post #13511327]

Why does SDR# show a spike at centre frequency?

That DC spike is the tuner’s zero-IF leakage. Enable “Correct IQ” to notch it [Elektroda, zabex, post #13333858]

I get no DVB-T after installing SDR drivers—normal?

Yes. WINUSB replaces Realtek’s TV driver. Switch USB port or reinstall OEM driver when you need DVB-T reception [Elektroda, lysy1980, post #13511327]

What’s the simplest way to receive 0–30 MHz?

Add a 50 MHz HF up-converter using TA7358 or LA1185. It mixes HF to 50–80 MHz, cost under PLN 15 and sensitivity beats direct sampling [Elektroda, sb8gapi, #13074101; Elektroda, zabex, #12073526].

Can overheating freeze the dongle?

Yes. R820T can reach >60 °C and USB disconnects appear. Resoldering the USB plug and adding small heatsinks stopped lock-ups [Elektroda, mkpl, post #13635115]

Which antenna works best for wideband scans?

An outdoor TV log-periodic or discone on 50 Ω feed covers 50–1300 MHz. For HF add Mini-Whip or 20 m long-wire plus the up-converter [Elektroda, methyl, post #13657048]

Edge case: why does FM broadcast appear at 30 MHz?

Strong local FM images alias into 26–40 MHz when the front-end overloads. Use 88–108 MHz notch or reduce RF gain [Elektroda, mkpl, post #13583266]

Can I scan automatically like a hardware scanner?

Yes. Install the ‘Frequency Manager Scanner’ plug-in for SDR#; it hops user lists at 20 channels /s and logs activity [SDRSharpPlugins].

Is spectrum-analysis possible?

RTL-SDR plus ‘RTL-Power’ or ‘Spektrum’ sweeps 24 MHz–1.7 GHz, 2 MHz steps, ~30 dB dynamic range—handy for EMC checks [majek, 2013].

Statistic: how much HF noise reduction after shielding?

Wrapping the PCB in copper foil cut spur floor by 6 dB [Elektroda, mkpl, post #13636615]

How do I add HF direct sampling without removing the tuner?

On R820T boards, wire a 1:10 transformer to RTL pins 4-5, select “Direct Sampling Q” in SDR#. This keeps VHF/UHF intact [Elektroda, BOOM i ZONK, post #13914702]

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