I tried adding second monopole onto 1420 MHz cantenna at 90 degrees to first monopole in attempt to improve signal, with 1.5 wavelength phasing cable on one monopole. I used…
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,…
Some concrete examples of small-scale / home interferometry projects that use open-source software, so you can see how people have actually tied the pieces together. Here are some examples you…
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…
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