The "luxury version" was in the Elektor package.
Such SDR USB sticks are available in several variants. The above representation was taken from an unofficial data sheet. Unfortunately, the Formosa-based manufacturer does not release sufficient information about the behavior of its chip. The USB module supplied by Elektor is a tuner manufactured by Rafael Micro with the designation R820T, the interior of which is shown schematically in the following circuit. Something like this is therefore also found in USB sticks based on the RTL2832. The IC RTL2832 itself has no integrated tuner that takes care of the restriction of the recorded frequency range. In the documentation, Elektor even advises not to process more than 2.4 MHz at the same time. A realistic bandwidth is therefore a restriction to a maximum of 2.8 MHz or a little less. So it is a radio in the sense of the word usage.Īccording to the documentation and the information in the datasheet, the chip can monitor a spectrum of up to 3.2 MHz in "real-time operation." Practical experience shows that when this bandwidth is used to the fullest, samples are lost. It is not possible to send with the module. The SDR kit described here is about reception. It can collect I/Q samples and send them directly to the host - a function that was intended by the chip manufacturer to decode FM radio.
Rumors have it that a Linux kernel developer discovered that the RTL2832 IC manufactured by RealTek is more than just a classic DVB-T decoder. The story of this radio module system known from the RTL-SDR blog began, as so often, with a coincidence.
In times of increasingly inexpensive DSPs and powerful microcontrollers, this is an all too sensible train of thought. The principle is that parts of the signal processing, which used to be done in hardware (electronic components) are done digitally in SDR. The term SDR as an acronym for Software Defined Radio should not really need any further explanation today. The affordable RTL-SDR Kit is an experimental platform that enables SDR reception with practicable hardware. If you have taken an amateur radio exam in the course of the last few years, you likely have come across the topic of software defined radio (SDR) several times in documents.
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