January 2026
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Dimensions of my WR-650 hydrogen line rectangular feed purchased from ebay Dec 2025
Dimensions of the commercial rectangular WR650 feed I purchased off ebay Dec 2025 are 164mm wide x 82mm high x 128mm deep, with monopole probe located 57mm from back plane.
Active@ Disc Image of Andrew Sutkowski’s Linux Disc Image containing GNU Radio, SDR Play support, ezRA, ez-radio-astro.
Process for installation on a your PC – this PC will be wiped by this process so ensure it does not contain data you wish to preserve. This image was…
What is name of telescope design where eyepiece on pier rather than the scope?
This design is called a coudé telescope (often written coudé focus). In a coudé system, mirrors redirect the light down the mount or pier so the eyepiece or instrument stays…
HMC849 RF SPDT Switch board
The HMC849 is a high isolation, non-reflective DC to 6 GHz SPDT (Single-Pole, Double-Throw) RF switch available in a 16-pin, 4×4 mm LFCSP surface-mount package. Data Sheet: https://www.astronomy.me.uk/wp-content/uploads/2026/01/Analog-Devices-HMC849a-data-sheet.pdf Key Pin…
Video recording from BAA Hydrogen Line Radio Astronomy Sub-Group Meeting 5 January 2026
This was a wonderful meeting, with membership of the group increasing in every meeting!
Radio Astronomy Cartoon: Electrocuted by the LNA
(C) Andrew Thornett 5/1/2026 All rights reserved.
Cantenna Design for Hydrogen Line Observations
A cantenna, essentially a form of circular waveguide, is a practical tool used in radio astronomy to detect the hydrogen line (1420.405 MHz). Here’s a comprehensive overview of its design…
Testing coaxial relay & internal resistor in Nooelec SAWBird H1 Barebones LNA 04/01/26
This was a test inside house so hydrogen signal not detected.