How does an FIR filter work in GNU Radio
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An FIR filter (Finite Impulse Response filter) in GNU Radio works by applying a weighted sum of a finite number of input samples to produce each output sample. Let’s break…
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How could I create the equivalent of the FM demodulator block in GNU Radio, if the block did not exist?
FM demodulation looks mysterious in GNU Radio because it’s one tidy block… but under the hood it’s actually very simple. FM is just information encoded as changes in instantaneous frequency.…
Flowchart and figures from Communication systems with GNU Radio book
https://gitlab.com/gnuradio_book/flowcharts
In GNU Radio there is an AM demod block. If this wasn’t there what processes would be required to achieve same function?
AM demod looks simple on the surface, but under the hood it’s doing a couple of neat little tricks. If the built-in AM demod block vanished overnight, you’d rebuild it…
When writing an GNU Radio flowgraph for AM radio why must radio signal Input be multiple by fixed signal source before filtering?
Ahhh yes, welcome to the “why are we multiplying things?” club 😄 — this is actually the heart of how a radio works. Short answer:You multiply the incoming RF signal…
Software for Hydrogen-Line Radio Astronomy (H-Line RA, 1420 MHz)
https://www.astronomy.me.uk/wp-content/uploads/2026/02/Software-for-H-Line-RA-180226-DRAFT-090226@2200.pdf https://www.astronomy.me.uk/wp-content/uploads/2026/02/Software-for-H-Line-RA-180226-DRAFT-090226@2200.pptx
John Berman VLF SID Receiver & Antenna
John’s description of how to make his VLF Receiver & Antenna: https://www.astronomy.me.uk/wp-content/uploads/2026/02/SID-Station-using-Spectrum-Lab.docx Spectrum Lab Meteor Configuration File: https://www.astronomy.me.uk/wp-content/uploads/2026/02/workingconfig-6-feb-2026.zip
Radio observation in hydrogen line (1420MHz)
SETI Horn of Plenty (Hydrogen Line Pyramidal Horn Design Antenna)
Calculating pyramidal horn gain for range of different apertures
https://www.astronomy.me.uk/wp-content/uploads/2026/02/Calculating-pyramidal-horn-gain-different-apertures-080226.pdf
Another look at reflections By: M. Walter Maxwell, W2DU/W8HKK, 1973-1999
This series appeared in the April 1973, June 1973, August, 1973, October, 1973, April 1974,December 1974, and the August 1976 issues of QST magazine.Copyright 1973,1974,1976, 1999 American Radio Relay League.…
How to use WHISPER TRANSCRIPTION software to obtain a transcription of a video file
Following is relevant to when you have a video or audio file, and you want to turn its speech into an editable text document (like a transcript): 🔧 Options for…