Measuring Earth’s Orbit at 1420 MHz
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I asked ChatGPT how to do this, and here is its suggestion:
WR-650 Waveguide
WR-650 already covers 1.12–1.70 GHz, so 1.420 GHz sits comfortably in-band—you don’t need to resize the guide. What you do need is a simple, well-tuned coax-to-waveguide probe with a backshort…
WR-14 Waveguide
The WR14 waveguide (also known as WH14) is a rectangular waveguide used for millimeter-wave applications in the K-band. Here are the key technical specifications: Parameter Value Designation WR14 (WH14) Frequency…
WR-137 Waveguide
The WR137 waveguide is a rectangular waveguide commonly used in the C-band frequency range, particularly for radar, satellite communications, and radio astronomy work just below the hydrogen line. Here are…
WR-90 waveguide
The WR-90 waveguide is a rectangular waveguide commonly used for microwave signals, particularly in the X-band frequency range. Here’s a quick technical summary: Parameter Value Waveguide size (inside) 0.900 in…
Angular size of the Great Orion Nebula (M42)
Do you mean the angular size of the Great Orion Nebula (M42)?
SDRplay RSPduo and bias tee
Yes — the RSPduo does include a bias-tee on its Tuner 2 SMA port. (SDRplay) Here are some details and caveats:
Sampling / time resolution (“sample time”) and timing behaviour of the CosmicWatch muon detector.
Here’s what I found on the sampling / time resolution (“sample time”) and timing behaviour of the CosmicWatch muon detector: Key timing / sampling facts Summary & caveats So, in…
How does the flat sides of a corner reflector effectively channel the radio signal onto the waveguide?
That’s a neat question — it sounds a bit counter-intuitive at first! https://www.astronomy.me.uk/wp-content/uploads/2025/10/1000036614-161025.png Here’s why a corner reflector antenna doesn’t just bounce the hydrogen-line radio waves back out into space,…
Dimensions of horn antenna for hydrogen line radio astronomy
Yes — the dimensions of a horn antenna really matter for hydrogen line (1420 MHz, λ ≈ 21 cm) observing. The horn’s shape sets its gain, beamwidth, and impedance match,…