Screen shielding fabrication to reduce RFI:
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On SARA Mailing list from Alex Pettit 27/12/2025 re screen shielding fabrication to reduce RFI:
December 2025
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…
Normalising files from multiple systems in Easy Radio Astronomy Software (ezRA)
Ted Cline – N0RQV:secret ezCon command option …………. -ezConAntXTVTLevelL 1.3 -3.2 (multiply all AntXTVT sample values and add) Use per file (or batch files) to normalise.
Design feedhorn to give an attenuation of 10 to 12 dB towards the rim of the dish.
Andy, For parabolic dishes you want to design your feedhorn in such a way that it has an attenuation of 10 to 12 dB towards the rim of the dish.…
Ideal focus position for Discovery Dish feed (hydrogen line)
From Alex Pettit 23/12/2025, published on SARA Mailing List, sara-list@googlegroups.com Performance Exceeds anything I’ve seen in the ‘out of the box’ beginner systems ..