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GRC uses a block diagram (a flow graph) to represent your project. You can find a simple starter project on the video below. With GRC, though, it isn’t that important (in most cases) to understand that, just like you can use a video card without knowing exactly what signals are on the PCI express bus.
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Just know that the I and Q signals can combine to express any waveform and, conversely, any waveform can break up into a series of I and Q values. However, you don’t need to directly understand the theory behind quadrature signals to get started with GRC. If you aren’t familiar with expressing signals as I and Q components (sometimes known as quadrature data), that’s a big topic (with a great 3D explanation, one from Tektronix, and another one from National Instruments). However, radio devices will more likely provide complex numbers with an I and Q component. For an audio device, the samples will be real numbers. The first is some input device (a source) that is sampled at some sampling rate. There are several key building blocks that combine to make SDR possible. UPDATE: Don’t miss the follow-up post that uses SDRPlay to build a GNU Radio based receiver. It even has the ability to read and write data to the file system, so you can use it to do many DSP applications or simulations with no additional hardware.
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GRC has a signal generator block and interfaces to your sound card. This is a mostly graphical approach, allowing you to thread together modules graphically and build simple GUIs to control you new radio.Įven though you usually think of GRC as being about radios, it is actually a good framework for building any kind of DSP application, and that’s what I’ll show you in the video below. If Python is still not up your alley (or even if it is), there’s an even easier way to use GNU Radio: The GNU Radio Companion (GRC). GNU Radio provides a wealth of Python functions that you can use to create sophisticated SDR application (or, indeed, any DSP application). That’s the idea behind GNU Radio and SDR.
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Not many people could build a modern PC from scratch, but nearly anyone can get a motherboard, some I/O cards, a power supply, and a case and put together a custom system.
After all, SDRs require lots of digital signal processing (DSP) at high speeds.
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However, there is a big gap from being able to use off-the-shelf SDR software and writing your own.
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