How to generate a disc image from my Raspberry PI 4B?
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You can get a Raspberry Pi disk image in a few different ways depending on what you mean: 1. Downloading an official Raspberry Pi OS image If you simply want…
What difference does choice of material make with regards to construction of antennas?
Material choice affects an antenna’s efficiency, bandwidth, durability, and mechanical practicality. Here’s a concise breakdown of what really matters: 1. Electrical Conductivity This is the biggest factor. High-conductivity metals (copper,…
Is it benefitial to ensure that low noise amplifier and filter (LNA) for hydrogen line observing is at a constant temperature?
Andrew Thornett: I could see potential benefit for having LNA at constant temperature. The easiest way to achieve that is to cool it below any likely outside temperature – avoiding…
What is most expensive low noise amplifier and/or filter available for hydrogen line radio astronomy?
Short answer: the most expensive single-component front-end parts used for 1.420 GHz (H-line) work are cryogenic HEMT/InP LNAs and the associated cryogenic front-end systems (LNA + cryostat + cryocooler). Top…
Pulsars don’t have a single “pulsar frequency” the way spectral lines do.
Pulsars don’t have a single “pulsar frequency” the way spectral lines do — instead they emit broadband radio noise with periodic pulses, and what we observe are: Here are the…
Ted Cline’s Python command to set up basic tools for RA on Linux
sudo apt install git cmake build-essential gqrx-sdr cubicsdr libsoapysdr-dev soapysdr-tools gr-osmosdr uhd-soapysdr
Description of SAWBird H1+ LNA from Nooelec’s own website 23/11/2025
This might be of interest to folks interested in amateur hydrogen line radio astronomy – it is the description of the SAWBird H1 directly from Nooelec’s website today 23/11/2025: https://www.nooelec.com/store/sawbird-h1.html…
What’s Different Between different Nooelec versions of the RTL-SDR device?
There are quite a few different Nooelec RTL-SDR dongle versions, and the differences mostly come down to tuner chip, frequency range, stability / oscillator, size, and extra features like bias-tee.…
How to run snap update on Linux Ubuntu when error comes up to say Snap can’t update as it is currently running?
How to run snap update on Ubuntu when says can’t update it as running? Quick answer – summary of discussion below: Use a Loop to Stop All Snap Apps in…