Compared to the GPIO filters discussed in another article in this issue, Mini-Circuits’ 1415-1425 MHz cavity filters are at a significantly higher price point (around $700 at the time of…
Dr Andrew ThornettLichfield Radio Observatory – www.astronomy.me.uk GPIO Labs produces a selection of filters and low-noise amplifiers designed specifically for observations of the neutral hydrogen spectral line at 1420 MHz.…
Working configuration file on Spectrum Lab Software: https://www.astronomy.me.uk/wp-content/uploads/2026/02/LRO_VLF_Config_works-with-134cm-aerial-LRO-PC-10-210226@1800.zip Plot from Spectrum Lab showing the 5 stations being monitored & photo of the 134cm VLF aerial:
I am grateful to the help of John Berman on this project – I based the arrangement at LRO on his design. It uses Spectrum Lab Spectrum Analyser software, and…
For a VLF receiving loop, the exact wire length is usually far less critical than people expect. At VLF (about 3–30 kHz): So you are not building a resonant half-wave…
Success with detection! Bits and pieces arrived to make new aerial – and attached are test screenshots from Spectrum Lab – 6 stations seen clearly. This time, for some reason,…
Note this post doesn’t look any question about whether the paint affects signal reception. It only addresses whether the paint will work with a paint sprayer. **Hammerite** paint can be…
The name “Soapy” in SoapySDR (and the associated Soapy drivers) comes from the idea of making SDR hardware support clean and simple — as in “soap makes things clean.” SoapySDR…
This question is relevant to considering how close two observers need to be to each other in order to observe the same muon cascades, and hence obtain similar muon detections/have…
This is one of those things that sounds boring until it suddenly explains all your noise problems. Alright — let’s break it down in human terms. 🎙️ Unbalanced microphone input…
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