Calculating wavelength inside a cantenna at 1420 MHz (Hydrogen Line)
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Radio Astronomy
SARA Analytical Section if it’s website and 20m Skynet dish at Greenbank
SARA’s web Analytical Section … https://www.radio-astronomy.org/node/200 talks of the 20m dish telescope.
Cygnus A hydrogen source type from SARA Meeting 21/12/2025
@Rick K0GD Cyg A is a continuum source, so you won’t see it in hydrogen line. Instead you will just see an increase in power over the whole spectrum when…
Linear vs switched mode power supplies
Here’s a clear, practical comparison, with an emphasis on noise-sensitive and technical uses. Linear Power Supply (LPS) How it works Mains → transformer → rectifier → smoothing capacitors → linear…
Julian Palmer Design Monopole Probe Assembly for Cantenna 12/12/2025
Our intention is to design a cantenna where fine tuning can be achieved experimentally in the same device without needing to re-make the cantenna or physically cut bits off the…
Ku-Band Interferometry
From the Society of Amateur Radio Astronomy Mailing List 12/12/2025: We operated a Ku-band interferometer with two 1.2-m dishes placed on a 10-m baseline in east-west direction. It is dismantled…
Start Simply, Build Slowly – The Best Advice for Amateur Radio Astronomy
Drift scanning works well for hydrogen line work, even with small antennas or dishes and I would strongly recommend starting with that. With regards to pointing/compass, make line on the…