How to change a username in Linux
Admin
Good question — changing a username in Ubuntu is possible, but it needs care to avoid breaking permissions or SSH keys. Below is the safe, step-by-step method for renaming a…
How to switch your Linux keyboard layout to US (United States)
Here’s how to switch your Linux keyboard layout to US (United States), either temporarily or permanently. 🧩 Option 1 – Temporary switch (immediate effect) Run this in a terminal: That…
Comparison SDRplay RSPdx and RSPduo
Here’s a comparison of the SDRplay RSPdx vs RSPduo (and notes about the newer RSPdx-R2), aimed at how they differ for radio astronomy, HF/VLF/LF work, and general SDR use. If…
Instructions on how to install gr-radio-astro (contains set of GNU Radio modules required for DSPIRA GNU Radio Projects) & stand alone USB Flash Drive with preinstalled software & installing on a Raspberry PI
The following is an extract from the WVURAIL/gr-radio-astro Github repository giving installing instructions for this important pre-requisite needed to use DSPIRA GNU Radio GRC flow-graphs. I have also included instructions…
Problems running DSPIRA GRC (GNU Radio Companion) flow-graphs due to missing gr-radio_astro out-of-tree (OOT) module in GNU Radio installation
I am experiencing errors when I try to tun DSPIRA GRC (GNU Radio Companion) flow-graphs due to missing gr-radio_astro out-of-tree (OOT) module in my Windows GNU Radio installation. What is…
Stressed dish antennas for radio astronomy
A stressed dish (or stressed-skin parabolic reflector) is a lightweight reflector design where the parabolic surface is formed by tension and stress in the materials, rather than machining a rigid…
Block diagrams of proposed GNU Radio Interferometer 4/10/2025
https://www.astronomy.me.uk/wp-content/uploads/2025/10/rspduo_interferometer_full_block_diagram_annotated_251004_172229.pdf https://www.astronomy.me.uk/wp-content/uploads/2025/10/rspduo_interferometer_simplified_block_diagram_251004_171113.pdf
Comparison between the RTL‑SDR Blog V3 and RTL‑SDR Blog V4,
Here’s a detailed comparison between the RTL‑SDR Blog V3 and RTL‑SDR Blog V4, along with practical implications (especially for your antenna-wire setup). If you like, I can summarise a “which…
Adjusting spectrum display’s Y-axis (dB range) in SDRConnect
In SDRconnect the controls for adjusting the dB scale / Y-axis (reference level, dB range) are under the “Primary SP display settings” section in the left panel. (SDRplay) Here’s exactly…
Adjusting spectrum display’s Y-axis (dB range) in SDRUno
In SDRUno, the spectrum display’s Y-axis (dB range) can be adjusted so you can see more (or less) of the signal rather than just the top. Here’s how: 👉 In…