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…
Radio observation in hydrogen line (1420MHz)
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…
Painting hydrogen line radio telescopes at LRO with metal-protective paint
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).
Converting between relative RMS power to dB in order to make performance estimates of radio telescope systems
Hi Andy, Just been watching the recent April 2026 Drakes lounge and in particular your piece where you talked about how you worked with Jason to make a conversion between…
Measurements of 150cm solar cooker radio telescope that forms LRO-H2.
I am grateful to Alex Pettit for helping me calculate the dimensions. LRO-H2 Hydrogen Line Radio Telescope: Measurements in cm: Diameter 150.00Depth 24.00Focal Length 58.59 Radius Depth x 0.00 y…
Is there any benefit to using any other type of feed other than cantenna or loop feed for a small amateur radio astronomy dish for hydrogen line work & is there any benefit to adding a sleeve balun on Loop Feed?
Does this mean in practice that there is no practical reason to need any other type of feed other than cantenna or loop feed for a small amateur radio astronomy…
Which are best parts of the Milky Way to observe to test Hydrogen Line Radio Telescope systems?
Information from Alex Pettit: Courtesy of Marcus Leech & CCERA: It is Spot On. Two Bright Areas Dec+40 dg RA 2030 hrs Dec+20 dg RA 0615 hrs On small systems,…
What is ideal diameter copper wire to use for building a loop feed for hydrogen line radio astronomy?
wire dia : #18 ga or so is fine .. Nothing is exact .. or perhaps reworded ” It is impractical to attempt to derive an equation for the electrical…