Alex Pettit: Advantages of process of using SDR# with IFAverage plug-in, and Rinearn-3D for analysis of hydrogen line data 13/1/2025
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https://www.astronomy.me.uk/wp-content/uploads/2026/01/Alex-Pettit-SDR-IFAv-Rinearn3D-130125.pdf
Attending & talking at conferences, workshops & societies
NanoVNA
Radio observation in hydrogen line (1420MHz)
NanoVNA Mini-far-field antenna range from EuCARA Sept 2025
In September 2025, Jason Burnfield & myself delivered a workshop on creating and using a mini-far-field antenna testing range at home using a NanoVNA. Materials describing how this is done…
Biggest amateur hydrogen line horn antennas
In the amateur radio astronomy community, the “biggest” horn antennas for 1420 MHz hydrogen line detection typically follow the design principles of historical and specialized academic projects, balancing size with…
Is there any advantage to making a cantenna feed where the sides are not parallel?
Short answer: usually no for a classic cantenna, but yes in specific variants. Why standard cantennas use parallel sides A conventional cantenna is a cylindrical waveguide designed to support the…
Alex Pettit: SDR# > IFavg > HL3D > Rinearn-3D for Hydrogen Line Radio Astronomy
Useful information from Alex Pettit: H-Line 3D (HL3D) does following: 1) takes theIFavg file set, analyses the drift and slope of each file at ( user specified ) non H…
Dimensions of my WR-650 hydrogen line rectangular feed purchased from ebay Dec 2025
Dimensions of the commercial rectangular WR650 feed I purchased off ebay Dec 2025 are 164mm wide x 82mm high x 128mm deep, with monopole probe located 57mm from back plane.
Active@ Disc Image of Andrew Sutkowski’s Linux Disc Image containing GNU Radio, SDR Play support, ezRA, ez-radio-astro.
Process for installation on a your PC – this PC will be wiped by this process so ensure it does not contain data you wish to preserve. This image was…
What is name of telescope design where eyepiece on pier rather than the scope?
This design is called a coudé telescope (often written coudé focus). In a coudé system, mirrors redirect the light down the mount or pier so the eyepiece or instrument stays…
HMC849 RF SPDT Switch board
The HMC849 is a high isolation, non-reflective DC to 6 GHz SPDT (Single-Pole, Double-Throw) RF switch available in a 16-pin, 4×4 mm LFCSP surface-mount package. Data Sheet: https://www.astronomy.me.uk/wp-content/uploads/2026/01/Analog-Devices-HMC849a-data-sheet.pdf Key Pin…