Moxon dimensions for radio scatter at BAA Radio Beacon and GRAVES
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Here are practical, build-ready Moxon dimensions for the two bands. I’m using standard Moxon A-E notation (A = overall width; B = tip gap between element ends; C = feedpoint…
Radio Astronomy
Common Ferrite Types (and Their Useful Ranges)
Common Ferrite Types (and Their Useful Range)Ferrite MaterialﾠTypical Trade NameﾠEffective Range (MHz)ﾠTypical Use#31ﾠFair-Rite mix 31ﾠ1 – 300 MHzﾠWideband RFI suppression (HF/VHF)#43ﾠFair-Rite mix 43ﾠ25 – 300 MHzﾠVHF suppression#61ﾠFair-Rite mix 61ﾠ200 –…
Why mesh 5-10mm is fine for 21cm hydrogen line dishes
Example at the 21 cm Hydrogen Line For your 12-ft (3.65 m) dish, assuming ideal design efficiency η0=0.7\eta_0 = 0.7η0=0.7: RMS Surface Error (σ)ﾠσ / λﾠEfficiency (η/η₀)ﾠNet η 1 mmﾠ0.005ﾠ0.999ﾠ0.70…
External power from a low-noise amplifier (LNA) can potentially cause problems with an SDR (Software Defined Radio)
External power from a low-noise amplifier (LNA) can potentially cause problems with an SDR (Software Defined Radio), depending on how the power is supplied and whether the SDR’s RF input…
Stressed dish antennas for radio astronomy
A stressed dish (or stressed-skin parabolic reflector) is a lightweight reflector design where the parabolic surface is formed by tension and stress in the materials, rather than machining a rigid…
Why is there a slope of Easy Radio Astronomy (ezRA) ezCol data collection from my radio telescopes?
The screenshot below shows data collection on ezCol from both LRO-H2 Monopole 1 and LRO-H2 Monopole 2 (2 orthogonal polarisations on same cantenna waveguide on same 150cm parabolic reflector used…
“First Light” on LRO-H2 (150cm Parabolic Solar Cooker Radio Telescope at Lichfield Radio Observatory) with two orthogonal monopoles in the cantenna prime focus waveguide 27/9/2025 @ 10:35 BST (UTC+1)
At last! Go this 2nd monopole installed on the cantenna at 90 degrees to first – so now I can collect vertically and horizontally polarised 1420 MHz data – given…
SDRplay RSPDuo & radio interferometry
Short answer — yes you can do radio interferometry with the SDRPlay RSPDuo software defined radio, but with caveats. Downloads to go with this post mentioned in text below: https://www.astronomy.me.uk/wp-content/uploads/2025/09/sdrplay_windows_package.zip…
Result of Processing all LRO1+2+3 data using -ezConGalCrossingGLatNear 0-5 (change default 5degs to 0-5degs) 21/9/25
Ted Cline who has written ezRA has now added a new feature which gives users the ability to limit data used in analyses to a narrow range +/- near galactic…
An attempt at creating a ready-to-run GNU Radio Companion flowgraph + Python calibration script, tuned for 1420 MHz hydrogen line work.
A ready-to-run GNU Radio Companion flowgraph + Python calibration script, tuned for 1420 MHz hydrogen line work. Downloads to go with this post: https://www.astronomy.me.uk/wp-content/uploads/2025/09/interferometer_polarimetry_bundle.zip https://www.astronomy.me.uk/wp-content/uploads/2025/09/RSPduo_Interferometer.zip https://www.astronomy.me.uk/wp-content/uploads/2025/09/RSPduo_Interferometer_Flowgraphs.zip Here is a working…