Building a horn antenna tuned for the 21 cm (1420.405 MHz) hydrogen line is a popular and effective way to do amateur radio astronomy. A horn antenna is especially good…
WR-650 already covers 1.12–1.70 GHz, so 1.420 GHz sits comfortably in-band—you don’t need to resize the guide. What you do need is a simple, well-tuned coax-to-waveguide probe with a backshort…
Yes — the RSPduo does include a bias-tee on its Tuner 2 SMA port. (SDRplay) Here are some details and caveats:
Yes — the dimensions of a horn antenna really matter for hydrogen line (1420 MHz, λ ≈ 21 cm) observing. The horn’s shape sets its gain, beamwidth, and impedance match,…
I am just about to use the following file on the Solar Cooker Radio Telescope (LRO-H2) as part of a test of a system to collect data in ezCol .txt…
Collated document I have put together, which I think might tell people how to do this……no promises! I got it working once, but twice might be too much to ask!!…
This will not be Milky Way as inside and Doppler shift on the 1420 MHz line too big – about 190 km/s (calculated from the difference in frequency on plot…
Two monopoles at 90 degrees in cantenna One connects to splitter immediately Two connects via coax either 1/4 wavelength or 5/4 wavelength (more practical length = 26.5cm x 66% (velocity…
From: A. C.Sent: 06 October 2025. Andrew, I was going to mention but I forgot, in the after RTOP meeting yesterday you asked what the High Z antenna connectors in…
Successfully detected Radio 2 with this today. https://www.astronomy.me.uk/wp-content/uploads/2025/10/Working-Simple-display-SDRplay-RSPduo-GRC-File-051025.zip
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