2025
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Is there any advantage to using RF filters when detecting Jupiter radio emissions?
Yes — RF filters can significantly improve your ability to detect Jupiter’s radio emissions, depending on your setup and local RF environment. Here’s a breakdown of when and why they…
How physically big can a cavity RF filter be made? For example, is there an advantage to making a 50cm long cavity filter for 1420 MHz?
Short answer: you can make a cavity “as big as you like,” but past a sensible size you don’t gain performance—and you often make things worse (more spurious modes, weight,…
What are the advantages and disadvantages of adding more digits in an interdigital RF cavity filter?
Adding more digits (fingers or resonators) in an interdigital RF cavity filter has several important advantages and disadvantages, depending on what you are optimizing for (selectivity, insertion loss, bandwidth, physical…
What happens if I put two x RF DC-22MHz filters in parallel?
Short version: “Parallel” doesn’t help—and can make things worse. Here are the three ways people mean “parallel,” and what actually happens: If your goal is to move the −3 dB…
I have a mini circuits DC-22MHz filter. Would it be possible to slightly adjust range up by 2MHz with extra components?
Short answer: not really. Mini-Circuits “DC–22 MHz” parts are fixed, 50 Ω-matched, sealed networks (usually elliptic/Chebyshev LC). To move the cutoff up by ~2 MHz you’d need to reduce the…
How to run Linux under Windows
You’ve got three good ways to run Linux under Windows 11, depending on how much integration or isolation you want. Here’s a breakdown: 🥇 1. Use WSL 2 (Windows Subsystem…
Protected: Beta Test version of Ted’s new ezCol and ezCon for SDRplay 1/11/2025
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Pictures of meteors detected by radio meteor scatter at LRO
Pictures can be accessed via download of ZIP archive below: https://www.astronomy.me.uk/wp-content/uploads/2025/11/Pictures-for-Astronomy-Now-011125.zip