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…
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…
I have posted this recommendation from Doug. Although I have purchased one of these cards, I cannot personally vouch for how effective it is, now how it compares to other…
I used Hammerite silver paint – took 4 x 1 litre tins to cover all telescopes front and back (except back of mounted 150cm solar cooker dish which is sprayed).
I have successfully replicated the experiment in the Comic Watch manual showing change in rates measured as result of radioactive test source (radioactive rock from ebay) on top of detectors…
Two detectors in coincidence mode, one on top of other. Radioactive rock test sources from ebay – large and small ones – plus I have some pieces of lead which…
Untested advice from ChatGPT: The following comes from ChatGPT. I am unable to verify the content from personal experience. I have entered this advice onto this blog as part of…
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