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…
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…
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…
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…
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…
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 ✅…
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…
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…
If your “two cables joined in the middle, held aloft on poles with a single feed down the centre” is a centre-fed wire dipole / inverted-V style tuned to 1420…
The video from this meeting is available here:
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