A Demonstration of the RTL-SDR Receiving WiFi and 2.4 GHz ISM with a Modded SUP-2400 Downconverter

Back in April we posted about how KD0CQ found that he could receive signals up to 4.5 GHz with an RTL-SDR by using a $5 downconverter for DirecTV called the SUP-2400. The RTL-SDR can only receive up to a maximum frequency of about 1.7 GHz, but the SUP-2400 downconverter can be modified to convert frequencies at around 2.4 GHz down into a range receivable by the RTL-SDR.

When we first posted the story the instructions for modifying the SUP-2400 to use as a downconverter weren’t uploaded yet, but they are now. The modification requires decent soldering skills as it involves desoldering a few small SMD components and bridging some points with wires.

Over on YouTube user T3CHNOTURK has uploaded a video showing the downconverter in action. With the SUP-2400 downconverter and RTL-SDR he is able to receive some WiFi at 2.447 GHz as well as signals from a wireless keyboard at 2.465 GHz

RTLSDR Receiveing wifi & 2.4 ghz ism band with moded SUP-2400 Downconverter

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I mean the MMDS downconverter


Can I use MMDS instead? If I would , am I going to need a power injector?


I see that the Outernet receiver uses the RTL-SDR.com dongle. Is this a V.3 dongle?




George Ou

Airspy only supports 5 MHz of usable bandwidth. Wi-Fi is at least 20 MHz wide, and 40 MHz or 80 MHz is now getting common. Is it possible for SDR# or GNURadio to rapidly hop between 4 frequency ranges to get a picture of what 20 MHz looks like? I realize that the performance drops since the samples are split 4 ways, maybe split 16 ways if we’re trying to look at an 80 MHz wide signal.


Not to mention 2.4 GHz also has the 13cm ham band, right below WiFi. I believe a couple of amateur satellites have downlinks in this range. For example FunCube2 (whenever its activated for amateur use).