Scaling hydrogen horn elements
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The SETI League provides a set of dimensions to build a hydrogen horn. This has two components – the waveguide element at the far end which must have specific dimensions…
What are the other frequencies beside 22 GHz which have bright masers open to amateurs to observe, and what bandwidth is required to observe them?
There are several maser transitions accessible to amateur radio astronomers, although 22.235 GHz water (H₂O) is by far the most popular because the sources are strong and the equipment is…
Bandwidth required on cavity filter for water masers
Eduard Mol on one of the SARA meetings/online videos shows plot of W3ORS5 of water maser at 22 GHz. The plot shows LSR velocity km/s from -70 to -20 on…
On my Samsing A34 I have power saving which is stopping apps. That is fine. But I would like to exempt Microsoft Authenticator is that possible?
Yes. On a Samsung Galaxy A34 you can exempt Microsoft Authenticator from Samsung’s battery restrictions, although it depends slightly on the One UI version. The setting you want is Unrestricted…
Drop in muon counts seen on LRO UKRAA PicoMuon Muon Detector on Saturday 11/7/2026
Before we all watched England successfully get through to the semi-finals of the FIFA world cup, this change in detection rate was seen on my PicoMuon detector. Other observers on…
Airspy HF+ vs Airspy HF+ Discovery specifications
Airspy HF+ Discovery and Airspy HF+ are closely related, but the HF+ Discovery is the improved second-generation design. For weak-signal work (including radio astronomy experiments) the Discovery is generally the…
Choices available for RF filters for amateur water maser radio astronomy (22 GHz).
The 22 GHz astrophysical maser is a water (H₂O) maser. The principal water maser transition is: This corresponds to the 6₁₆ → 5₂₃ rotational transition of water vapour. Water masers…
URLs for designs for cubesat analogue for teaching purposes
If you’re looking for educational CubeSat analogue/mock satellite designs that can be built and used on the ground, these are among the best open resources: For someone interested in building…
Latest working version of ezColGR – provides FFT 512 bins with Airspy Mini and saves data in ezRA text file format 10/7/2026
Click on link to download: https://www.astronomy.me.uk/wp-content/uploads/2026/07/LRO-H5-ezColGR-Flowgraph-100726.zip