GNU Tutorials
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LNA vs LNB
They sound similar, but they serve different purposes in the signal chain: LNA (Low-Noise Amplifier) LNB (Low-Noise Block Downconverter) ✅ In short:
ChatGPT suggestions on how to fix deaf SDR Play with GNU Radio at 1420 MHz where 100 MHz in same setup seems fine
Short answer: at 1420 MHz you’re probably running out of front-end signal, not software. FM at ~100 MHz is insanely strong so it “looks fine,” but your L-band setup needs…
Fast Fourier Transformation (FFT)
Reproduced from Wikipedia 9/9/2025. Fast Fourier transform A fast Fourier transform (FFT) is an algorithm that computes the discrete Fourier transform (DFT) of a sequence, or its inverse (IDFT). A…
Why is there a central spike in frequency plots from many software defined radios?
From Ted Cline 9/9/2025: The spike at frequency zero is just a consequence of the fact that your signal does not have an average of zero. The value at “frequency…
Comparing Software Defined Radios for Radio Astronomy
Here’s a compact, practical comparison of the popular low-to-mid cost SDRs you named (RTL-SDR v3/v4, ADALM-PLUTO, Ettus B210, LimeSDR family) plus a few other often-used SDRs (HackRF, Airspy, SDRplay) produced…
Meteorology-Relevant Facility at Harwell Campus
Here’s your image of Harwell Campus to set the scene: Meteorology-Relevant Facility at Harwell Campus RAL Space (Science and Technology Facilities Council) stands out as the key facility at Harwell…
Phased Arrays vs Aperture Synthesis
Great question! Phased arrays and aperture synthesis are closely related in radio astronomy and antenna engineering, but they’re not identical. Here’s a clear breakdown: Phased Arrays Aperture Synthesis Relationship ✅…
Normalising data produced by Easy Radio Astronomy Software Suite (ezRA) from multiple telescope systems to allow them to be combined to generate combined plots and maps.
This is very much a work in progress, so there isn’t a definitive answer from this post……. Andy Hi Ted, I asked ChatGPT to have a go at this and…
Formula for speed of light, and why it is a constant
What is the formula for the speed of light? Why is it considered a constant if there is a formula? Great question! Let’s unpack it step by step: 1. The…