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How bad a problem is intermodulation of RF at 1418-1422 MHz in UK?
In the UK, true in-band transmissions at 1418–1422 MHz are essentially nonexistent because this sits inside the internationally protected 1400–1427 MHz passive band allocated to radio astronomy and Earth-exploration (passive).…
How wide is cut off bandwidth for Nooelec SAWBird H1 LNA?
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 /…
How much of 1420 MHz band is protected in UK?
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…
Are there any variable capacitors on Amazon covering 10 uF?
I searched available parts online — but there really aren’t any continuous mechanical variable capacitors around ~10 µF on Amazon, eBay, or typical component suppliers. Mechanical variable capacitors (rotary types)…
How many pF in 1nF capacitor?
There are 1,000 picofarads (pF) in 1 nanofarad (nF).• 1 nF = 1,000 pF• 1 pF = 0.001 nFThis is a straightforward conversion based on the metric system where the…
Airspy Software-defined radios and radio astronomy
There **are numerous online references linking AirSpy software-defined radios (SDRs) with software-defined radio use in radio astronomy, both in project guides and community discussions about detecting astronomical signals. Here are…
Can a radio telescope parabolic mirror be made with number hexagons not electrically connected?
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…
Live observation from LRO-SIDS5 on 1/3/2026 @ 20:19
This is a live observation from my new 134cm VLF/SIDs aerial which directly feeds into the computer soundcard.
My presentation for SARA RTOP Meeting 1/3/2026
I asked for help on whether my design and dimensions of the single-cavity hydrogen-line Cavity Filter are correct. https://www.astronomy.me.uk/wp-content/uploads/2026/03/SARA-RTOP-My-Presentation-010326.pdf