The is designed specifically for hydrogen-line (21 cm, ~1420 MHz) reception by combining a SAW band-pass filter with low-noise amplifier stages. According to the manufacturer’s published specs: 📶 Bandwidth /…
In the United Kingdom, the L-band around the 1420 MHz hydrogen line is formally recognised and protected for passive scientific use, meaning emissions by other services are prohibited or very…
Yes — a radio telescope reflector can be made from separate hexagonal panels that are not electrically bonded together, provided certain conditions are met. This is actually very common in…
Designing a simple cavity filter for 1420 MHz (the neutral hydrogen line at 1420.405 MHz) is very practical for radio astronomy front ends, especially to reduce out-of-band interference before amplification.…
https://www.astronomy.me.uk/wp-content/uploads/2026/02/ZHL-1217HLN_dashboard.pdf
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.…
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…
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…
The answer isn’t “magic DSP.” It’s architecture. And a bit of ruthless engineering discipline. Modern SDRs don’t actually have “less noise” in the physics sense — they have more stable,…
Admin