How well does a steel dish work at 1420 MHz?
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At 1420 MHz (the hydrogen line at 21 cm wavelength Hydrogen line), a steel dish performs essentially as well as any other good conductor—provided the geometry and surface quality are…
Airspy R2 vs Airspy mini specifications
Engineering-style comparison of the two—useful if you’re deciding for SDR work like interferometry or radio astronomy. Compared devices Key specifications comparison Feature Frequency range 24–1700 MHz native 24–1800 MHz (similar…
Plots of data collected using Brian Coleman’s self-made hydrogen-line feed placed at correct (I think…but maybe not?) focal point on the LRO-H2 telescope (150cm Solar Cooker Radio Telescope) & pointed towards either outer Milky Way (1 spiral arm seen) or inner Milky Way (2 spiral arms seen) 16 May 2026
Lichfield Radio Observatory, UK. Azimuth 168 degrees. Elevation 75 degrees. I have tested various distances of the feed from the centre of the dish over several weeks and concluded that…
My 150cm LRO-H2 hydrogen line radio telescope is pointed azimuth 168 degrees, elevation 75 degrees, and collecting data by 24-hour transit scans. Which Milky Way parts does it pass through when trace shows one or two arms?
To solve this question, I think of my dish as fixed on the sky at az 168° / el 75°. Over 24 hours, the Earth’s rotation sweeps different parts of…
If anyone is having trouble with BlurXterminator plug-in for Pixinsight after the recent update (May 2026) this is what you have to do to get it working again
If anyone is having trouble with Blurxterminator in Pixinsight after the update this is what you have to do to get it working again by replacing the Tensorflow file in…
The Rational Resampler in GNU Radio is a DSP block used to change a signal’s sample rate by a precise fractional (rational)
Stephen Arbogast has noted an error in the BAA GNU Radio for Amateur Radio Astronomy meeting last Monday and sent me the following information: A rational re-sampler block does not…
Measuring Solar Differential Rotation with JSol’Ex software and the Sol’Ex Spectroheliograph.
This is a condensed summary of key ideas discussed in Cedric Champeau’s blog post of the same name, found at https://melix.github.io/blog/, and where further detailed information on this subject can…
Can I make single distributable out of GNU Radio script with relevant parts GNU Radio?
Results of Microsoft Copilot AI search 15/5/2026. I do not know whether this works. Yes, it is possible to create a single distributable executable or package from a GNU Radio…
Is there any record available of how brightness supernova 2026 in ngc 5907 has changed?
From Microsoft Copilot 15/5/2026. I have not verified the accuracy of this information: Yes — there are publicly available records tracking how the brightness of Supernova 2026kid in NGC 5907…
Photo of Supernova 2026kid in NGC 5907 from Lichfield Radio Observatory 14/5/2026
Supernova 2026kid is a Type II supernova that was discovered in the galaxy NGC 5907 on April 22, 2026. It is located in the constellation Draco and has a redshift…