Detecting the hydrogen line at 1420.4058 MHz is a popular project among amateur radio astronomers, and several software-defined radios (SDRs) are suitable for this purpose when paired with appropriate antennas…
Detecting the 21 cm hydrogen line (the characteristic emission from neutral hydrogen in the Milky Way) requires a radio antenna sensitive to that wavelength. The wavelength of this emission is…
This page has been created with the help of ChatGPT 11/1/2025. Compare performance and attenuation standard LMR-600 and flexible LMR-600 coaxial cables: The LMR-600 Standard and LMR-600 Flexible are both…
Filter arrangement 1: Ptarmigan Dipole Array ==> WT Microwave 1418-1422 MHz Cavity Filter ==> Nooelec SAWBird LNA ==> RTL-SDR Blog V3 Software Defined Radio. Filter arrangement 2: Ptarmigan Dipole Array…
Insertion Loss in Nooelec SAWBird H1: The Nooelec SAWbird+ H1 is a self-contained low-noise amplifier (LNA) module designed for hydrogen line detection around 1420 MHz. It features two ultra-low-noise amplifiers…
These plots have been produced using data from Lichfield Radio Observatory (LRO) between 29 May 2024 and 18 August 2024, processed using new functions in latest version of Ted Cline’s…
Shows very low power levels on my system compared to the two comparators. Andy
From: ‘Alex P’ via Society of Amateur Radio Astronomers <sara-list@googlegroups.com>Sent: 04 January 2025 10:28To: Society of Amateur Radio Astronomers <sara-list@googlegroups.com>Subject: Re: Adapter attenuation ~ 0.15 dB / adapter Please ‘Review’…
From: ‘Alex P’ via Society of Amateur Radio AstronomersSent: 04 January 2025 10:28To: Society of Amateur Radio AstronomersSubject: Re: Adapter attenuation ~ 0.15 dB / adapter
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