Radio Astronomy
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How to use directional coupler to provide reference signal in Easy Radio Astronomy software (suggestions by ChatGPT 27/12/2025)
The following are suggestions from ChatGPT (effectiveness not verified, 27/12/2025): Easy Radio Astronomy (ezRA) expects a stable reference channel so it can compare amplitude and/or phase changes against the sky…
Using directional couplers to provide reference signals for hydrogen line radio astronomy
Andy, A directional coupler is a device which allows RF to pass along one path in either direction with very low insertion loss while tapping off a reference signal at…
Screen shielding fabrication to reduce RFI:
On SARA Mailing list from Alex Pettit 27/12/2025 re screen shielding fabrication to reduce RFI:
RF Reference Signals using very low insertion loss 20+ dB isolation directional couplers fed with an active noise source of known noise power and spectral characteristics.
From Robert Meade, SARA mailing list 24/12/2025: Rather than using Dicke switching of the RF path between the antenna and a resistor as a noise source with PIN diodes, physical…
Processing LRO-H1 (Ptarmigan Array Radio Telescope) Data 25/3/2025-25/12/2025 – Milky Way Map 25/3/2025-25/12/2025 using one month drift scans at each elevation
Hi All I hope you have enjoyed Christmas Day – I have just processed the first part of my data set using one month per drift scan elevation = the…
Designing & Constructing a Cantenna (Circular Waveguide Antenna / Tuned Cylindrical Waveguide) for hydrogen line radio astronomy (1420 MHz)
Here is what you need to build your own Cantenna: Doing the math:Use an online calculator, such as the one at https://www.jefatech.com/products/cnfbst?keyword=cantenna, or https://www.changpuak.ch/electronics/cantenna.php, https://www.wikarekare.org/Antenna/WaveguideCan.html to check can size and…
Installing & Testing USB Relay on Ubuntu
Prerequisites Before testing the USB relay, ensure you have the following installed: Installation Steps bash Copy Code sudo apt-get update sudo apt-get install git python3 libhidapi-dev libhidapi-hidraw0 python3-pip bash Copy…
Hydrogen line observations From frugal to advanced Astropeiler & Wolfgang Hermann(Hydrogen1)
https://www.astronomy.me.uk/wp-content/uploads/2025/12/Hydrogen-line-observations-From-frugal-to-advanced-Astropeiler-Wolfgang-HermannHydrogen1.pdf