Radio Astronomy
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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.
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!
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.
Nooelec SAWBird H1+ Premium Low Noise Amplifier and 1420 MHz (Hydrogen Line) Filter Barebones Version Datasheet
Datasheet can be downloaded from link below – this was accessed 4/1/2026: https://www.astronomy.me.uk/wp-content/uploads/2026/01/Nooelec_Sawbird_H1_Barebones_Datasheet_Revision_1040126.pdf
Using large 4-5 metre mesh dishes for hydrogen line radio astronomy
These mesh dishes are certainly fine for the Hydrogen line and are probably good up to about 3 or 5 GHz. If you want to learn more about the performance…
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…
Internet resources on hydrogen line radio astronomy
Here are some good internet resources — guides, tutorials, and reference material specifically useful for getting into hydrogen-line (21 cm, ~1420 MHz) radio astronomy: 📘 Amateur & Practical Guides •…