Radio observation in hydrogen line (1420MHz)
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Installing & Testing USB Relay on Linux Ubuntu
Prerequisites Before testing the USB relay, ensure you have the following installed: Installation Steps bash Copy Code sudo apt-get update sudo apt-get install git python3 libhidapi-dev libhidapi-hidraw0 python3-pip bash Copy…
Parabolic dish focal ratios & spillover angles
From Alex Pettit 2-3/12/2025: Its related to the Feed Beam Pattern and the Shape ( f/D Depth ) of the dish. “All” f/D 0.35 dishes perform similarly regardless of diameter…
Applying the Nyquist theorem to radio astronomy
Great question — this is a very common confusion when first applying the Nyquist theorem to radio astronomy. You do not need a 2.8 GHz sample rate to observe the…
I have installed usbrelay softwate on Ubuntu for my 4 relay control board (which works on Windows). Running the command usbrelay detects device but can’t open it.
I have installed usbrelay softwate on Ubuntu for my 4 relay control board (which works on Windows). Running the command usbrelay detects device but can’t open it. If usbrelay sees…
Batch file used at LRO to process data Nov 2025
REM Identify data folder structure. REM The folder structure should be LRO folder with sub-folder called data. Save .txt data files in data and any .ezb and .npz data files…
British Astronomical Association Hydrogen Line Sub-group meeting 1/12/2025
https://files.ad.thornett.net/astronet/BAA_H-Line_Meeting_011225.mp4
Comparing RTL-SDR v3 and v4 software defined radios
Here’s what’s inside — i.e. the chips used: In short: R820T2 tuner + RTL2832U demodulator/ADC. Since you’re already familiar with SDR and radio-astronomy, here’s a summary of the key components…
Dave Bracey’s Hydrogen Line 3D modelling of Milky Way arms
From Dave’s brilliant data set suppled 27/11/2025 – (c) Dave Bracey 2025 – all rights reserved. Taken using Dave’s 150cm homemade backyard radio telescope in Bromyard, England, UK, 2025.
How does the radio frequency SAW filter in a Nooelec SAWBird LNA and filter?
In the SAWBird line of LNAs (e.g., for 1420 MHz, GPS, L-band), the SAW filter is the component that provides the ultra-narrow preselection that makes these modules so effective for…