In SDR# (SDR Sharp), dynamic averaging is a running average of successive FFT spectra. It smooths noise and stabilises the display, but it is not a fixed integration time. Instead,…
The following has come from ChatGPT. (An ASCII text version of this post is available for people who have difficulty reading this page at https://www.astronomy.me.uk/calulat8ng-attenuation-of-muons-in-lead-ascii-text-version) Assessing the results from LRO…
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This experiment was suggested to me at the last SARA online meeting. Here are the results – I started with zero and build up to 5, and to confirm went…
An X-Band feed has been installed on the 20m Skynet dish at Greenbank Observatory May 2026. What can we observe with it? Dimitry UA3AVR sent 14 May 2026: X-band on…
At 1420 MHz (λ ≈ 21 cm, the Hydrogen line), painting a steel dish with Hammerite (or similar metal paint) makes essentially no meaningful difference to RF performance, as long…
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…
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…
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…
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…
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