Radio Astronomy
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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.…
Peter East’s three articles on hydrogen line radio astronomy
https://www.astronomy.me.uk/wp-content/uploads/2025/12/Peter-East-Hydrogen-Line-Radio-Telescope-1.pdf https://www.astronomy.me.uk/wp-content/uploads/2025/12/Peter-East-Hydrogen-Line-Radio-Telescope-2.pdf https://www.astronomy.me.uk/wp-content/uploads/2025/12/Peter-East-Hydrogen-Line-Radio-Telescope-3.pdf
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 ..
Effect of small hardware changes on 1m class hydrogen line radio dishes on removing radio frequency interference (RFI).
The following information is from Alex Pettit 23/12/2025: For Example, in this case where local RFI is seen from an adjacent monitor to the receiver. The following 3 plots show:…
How much voltage would I loose on 5v linear power supply 5m cable to my LNA?
To work this out properly we need one key missing detail: the cable conductor size (wire gauge or cross-section) and ideally the current drawn by the LNA. That said, I…
How linear power supplies work
Andrew, yes it appears to be pretty much the type of power supply that I was referring to. Although I generally dislike Amazon listings as far as technical information details,…
Is there a better RF switch than HMC849?
Whether a “better” switch than the HMC849 exists depends entirely on the specific application requirements, as different switches are optimized for different parameters. The HMC849 is a specific high-performance, non-reflective…
HMC8038 RF Switch Data Sheet and specifications
https://www.astronomy.me.uk/wp-content/uploads/2025/12/HMC8038-RF-Switch-Data-Sheet.pdf https://www.astronomy.me.uk/wp-content/uploads/2025/12/HMC8038-RF-Switch-Specifications.pdf