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
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astronomy.network The Website of Lichfield Radio Observatory (LRO)
Andrew Thornett, Lichfield, England, M6THO, andrew (at) thornett (dot) net
Author: Admin
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
Read moreComparing 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)
Read moreMeteorology-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
Read morePhased 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.
Read moreNormalising 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,
Read moreFormula 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?
Read moreDipole vs radio dish or horn
If your “two cables joined in the middle, held aloft on poles with a single feed down the centre” is
Read moreBritish Astronomical Association Hydrogen Line Group (BAA H-Line Group) Meeting 1st September 2025
The video from this meeting is available here:
Read moreNormalising data files from multiple systems in ezRA
Ted Cline – N0RQV:secret ezCon command option …………. -ezConAntXTVTLevelL 1.3 -3.2 (multiply all AntXTVT sample values and add) Use
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