Modelling a 3 m dish at 1420.405 MHz in two ways: You’ll see: Diagrams: • Unblocked beam 2D: • Prime-focus (blocked+struts) beam 2D: • Beam cuts for 3m dish (this…
This comes up a lot in both radio astronomy and satellite communication when using prime-focus reflectors. On a prime-focus parabolic dish, diffraction effects mainly arise from: 1. Feed Support Legs…
There are several open-source software tools and libraries for interferometry / correlator / radio astronomy work. Depending on how much of the pipeline you want (just correlation, calibration + imaging,…
The “loss surface area” from a prime-focus feed is just the blocked (shadowed) aperture from the feed assembly (feed + support struts). You can estimate it with: So: Ablocked≈Afeed+N w D2,Fraction blocked=AblockedAdishA_\text{blocked}…
The weight of a 6 ft × 4 ft sheet of plywood depends on its thickness and the wood species/density. Let’s go step by step: 1. Area of sheet 6…
Weight of a 5 ft × 5 ft sheet of fine aluminium window screening. Let’s work it out step by step: 5 ft×5 ft=25 ft^2. 25 ft^2×0.035 lb/ft^2≈0.875 lb. That’s…
Great 👍 let’s pin down what’s pulling in xterm. On Windows GNU Radio Companion (GRC), that usually comes from a block that has its “Command” field hard-coded to xterm -e…
For a 30 cm jumper at 1420 MHz (H I line), RG174 and RG316 are effectively neck-and-neck—both cost you ~⅓–½ dB pre-LNA. Quick comparison (30 cm @ ~1.5 GHz) That…
That error message — “unable to scan ip19” — isn’t a standard GNU Radio error on its own. It usually comes from an underlying hardware driver or device source block…
That error message — “unable to scan ip19” — isn’t a standard GNU Radio error on its own. It usually comes from an underlying hardware driver or device source block…
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