How does an FIR filter work in GNU Radio
Admin
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…
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…
How does X-400 coaxial cable compare LMR 400?
Here’s a comparison of Paradar X-400 Ultra‑low‑loss Coaxial Cable (often called X-400) versus standard LMR‑400 Coaxial Cable (Per Metre) (the well-known low-loss 50 Ω coax): 📡 Purpose & Positioning X-400…
Creating 3D images with ezRA and Rinearn 3D, and with H-Line 3D
https://www.astronomy.me.uk/wp-content/uploads/2026/02/How-to-run-Alex-Pettit-3D-project-using-Ted-Cline-scripts-ezRA-191124.docx https://www.astronomy.me.uk/wp-content/uploads/2026/02/Alex-Pettit-Rinearn3D_QuickSettings02-041225.docx https://www.astronomy.me.uk/wp-content/uploads/2026/02/Full-Instructions-for-creating-4D-images-in-ezRA-Rinearn3D-250125@2330.docx https://www.astronomy.me.uk/wp-content/uploads/2026/02/Instructions-from-Ted-Cline-on-using-ezCol-data-with-Rinearn3D-RinearnHow241021a.pdf
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
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