Month: October 2025

For 1420 MHz (the H I line at 1420.4058 MHz), the “best” cavity filter depends on where you place it

Good — that’s a nice setup for remotely switching antennas, receivers, or feed chains. Let’s outline how to get both

Ultra-wideband (UWB) cavity filters are specialized RF/microwave filters that maintain the low loss, high power handling, and excellent selectivity of traditional cavity

Short answer: use the quietest DC you can. In practice that means: Why (and how) Hydrogen-line work is extremely sensitive

What is a practical way of generating low resolution images of Milky Way using interferometry with 2 x 150cm dishes

Here’s a concise, technically balanced comparison of SAW (Surface Acoustic Wave) filters and Cavity (Resonator) filters — especially relevant to radio astronomy, RF front-ends,

The attachments mentioned in the discussion below are available in following downloadable ZIP archive: https://www.astronomy.me.uk/wp-content/uploads/2025/10/Comparing-dish-sizes-performance-H-Line-311025.zip Here’s a practical comparison for

If you compare the Intel Core i7‑1065G7 with the first-generation desktop/server era Intel Core i7‑930 (or broadly the 1st-gen “Nehalem” i7s) you’ll find major architectural, process, power-efficiency and

The Mini‑Circuits ANNE‑50L+ is a very good choice for many purposes—let’s evaluate it specifically for your radio astronomy calibration use case (receive-only, around ~1.42 GHz).

Excellent and subtle question — and one that’s very relevant for radio astronomy calibration.Short answer: not all 50 Ω dummy loads