United Kingdom (UK) Military Radio Bands III, IV and V
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In the UK, Military Band III typically covers the frequency range of 225 MHz to 400 MHz. This band is primarily used for military aviation, tactical communications, and secure data…
Radio Astronomy
Online calculator for determining radial velocities relative to local standard of rest
The following link goes to such a calculator (this link works as of 23 February 2025): https://www.gb.nrao.edu/GBT/setups/radvelcalc.html Further discussion on this subject can be found here (23 February 2025): https://astronomy.stackexchange.com/questions/41196/looking-for-a-routine-to-correct-for-local-standard-of-rest-lsr
How electrically conductive is aluminium and zinc spray paint
I asked this question to ChatGPT today, which gave following answer: Aluminium and zinc spray paints contain fine metal particles suspended in a binder, but their electrical conductivity is significantly…
All my articles published in the Journal of the Society of Amateur Radio Astronomy between 1 November 2024 and 22 February 2025.
Click on links below to download PDF versions of these articles: https://www.astronomy.me.uk/wp-content/uploads/2025/02/SARA-Journal-article-3-days-LRO-data-with-ezCon250124b-script-Rinearn3D-FINAL-270125@2300-revised-150225@2000-2.pdf https://www.astronomy.me.uk/wp-content/uploads/2025/02/SARA-Journal-article-Integration-Times-ezCol-FINAL-280125-revised-150225@2000-2.pdf https://www.astronomy.me.uk/wp-content/uploads/2025/02/SARA-Journal-article-on-2-WTMicrowave-Cavity-Filters-FINAL-revised-150225@2000-2.pdf https://www.astronomy.me.uk/wp-content/uploads/2025/02/SARA-Journal-article-on-1420-1427MHz-Chinese-Cavity-Filter-Andrew-Thornett-J-SARA-Nov-Dec-2024-2.pdf https://www.astronomy.me.uk/wp-content/uploads/2025/02/SARA-Journal-article-on-2500-hour-LRO-Milky-Way-hydrogen-map-060124-161124-Andrew-Thornett-J-SARA-Nov-Dec-2024-2.pdf https://www.astronomy.me.uk/wp-content/uploads/2025/02/SARA-Journal-article-on-Mapping-Milky-Way-arms-in-3-spatial-dimensions-Andrew-Thornett-J-SARA-Jan-Feb-FINAL-120125@2200-revised-150225@2000-2.pdf https://www.astronomy.me.uk/wp-content/uploads/2025/02/SARA-Journal-article-on-mapping-Milky-Way-data-to-sphere-Andrew-Thornett-J-SARA-Jan-Feb-FINAL-130125@2200-revised-150225@2000-2.pdf https://www.astronomy.me.uk/wp-content/uploads/2025/02/SARA-Journal-article-on-simple-weather-resistant-housing-Nooelec-SAWBird-H1-LNA-130125@2200-revised-1502225@2000-2.pdf https://www.astronomy.me.uk/wp-content/uploads/2025/02/SARA-Journal-article-on-Solar-Cooker-Dish-RT-Andrew-Thornett-J-SARA-Nov-Dec-2024-2.pdf https://www.astronomy.me.uk/wp-content/uploads/2025/02/SARA-Journal-article-plotting-interpolated-velocity-vs-galactic-longitiude-LRO-H1-2nd-map-data-Andrew-Thornett-FINAL-SENT-TO-RICH-220225@1930-2.pdf
Plotting 3D images with Rinearn3D using Ted Cline’s new ezGal250218e.py script 19/2/2025 to generate Rinearn3D mesh CSV data file from all viable ezRA NPZ and EZB data files 060124-011124
The ezGal510 plot needs a lot of data to fill, so it is hard to avoid data gaps. The plots below are based on a substantial data set collected using…
Ground Waves and Sky Waves in Sudden Ionospheric Disturbances (SIDs)
From John at SARA Feb 2025: Hello, The signals that we receive consist of a ground wave and a sky wave, the sky wave being reflected / refracted by the…
First attempt at plotting 3D images using Rinearn3D using Ted Cline’s new ezGal250218e.py script 19/2/2025
The ezGal510 plot needs a lot of data to fill, so it is hard to avoid data gaps. The purpose of the ezGal510 plot is to plot interpolated velocity against…
Initial data analysis from third Milky Way mapping exercise with LRO-H1 & LRO-H2 – 15/2/2025.
So far, only 4 elevations on both radio telescopes. Difference between this data and previous data is that each data reading is integration over approx. 4 minutes rather than previous…
SKAO Making Hydrogen Line (1420.405 MHz) Radio Telescopes from readily available household materials, seen at Astrofest 6 Feb 2025
I was very impressed with this very well developed project presented by SKAO on their stand at European Astrofest February 2025 in London, UK. Using items readily available in most…