At 20 kHz you’re really designing a resonant system, not just adding a tuner box. For your kind of radio astronomy / interferometry work, the most practical approach is a…
From Brian Coleman: Hello Andrew, Looking at your photo the feed looks much too close to the dish. You need to calculate the focus point of the dish. The phase…
Yes—central obstruction from your feed does matter for a hydrogen line (1420 MHz) dish, but how much it matters depends on your goals and geometry. What central obstruction does When…
In principle yes, but in practice it’s very unlikely—and that’s why nearly all known astrophysical masers come from small, simple molecules. Why small molecules dominate masers Most astronomical masers involve…
For CosmicWatch in hardware coincidence mode, the criterion is actually very simple and quite tight: Hardware coincidence (detector-to-detector cable) 👉 So the effective “limit” is: Two pulses must occur within…
Feed removed from LRO-H2 today 19/3/2026 – this is the cantenna I have been using since I got the 150cm solar cooker dish: Feed-less dish: Brian Coleman’s H-Line feed on…
Dear All, Below is a reminder of the dates and times of the next monthly practical amateur radio astronomy online meetings. Please note the change to the start time of…
A muon hodoscope doesn’t just count how many muons hit it — it also tells you which direction they’re coming from, with pretty good accuracy. That turns out to be…
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