Pyramidal Horn Antenna Gain Calculator
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Link below to URL of webpage with such a calculator: https://www.everythingrf.com/rf-calculators/pyramidal-horn-antenna-gain-calculator
What thickness of monopole probe in cantenna matches 50 ohm impedance of hydrogen line radio telescope?
There isn’t a single magic thickness that by itself gives 50 Ω — but in practice, for standard rectangular waveguide probe feeds, there is a very reliable working range that…
How does thickness of monopole probe in a waveguide affect impedance?
Short answer: a thicker monopole probe looks electrically “fatter,” which lowers its impedance and broadens the match. Longer, more intuitive version 👇 What’s going on physically A monopole probe in…
How to calculate F/D ratio of radio dish?
F/D is purely geometric. Once you know any two of diameter, focal length, or depth, you can calculate it. Definitions: D = dish diameterf = focal length (vertex to focus)d…
How do I find F and D if I don’t know them? (Focal length and diameter of a radio dish)
Short, honest answer first: you can’t get absolute F or D from the dish shape alone without at least one real measurement. A parabola has no inherent scale. But —…
What is design working temperature of Nooelec NESDR Smartee software defined radio?
The (Nooelec NESDR Smartee) USB SDR dongle does not have a publicly listed official “design or operating temperature range” in its published specifications from Nooelec. The manufacturer datasheets and product…
I am looking for a GNU Radio flowgraph on Github or elsewhere that shows me how to incorporate ability to choose between SDRs whilst running the program.
Here are some open-source GNU Radio flowgraphs / projects on GitHub that you can study or adapt when you want to choose between different SDR hardware sources (e.g., RTL-SDR, USRP,…
How do the dimensions of the hydrogen line horn made by SETI League & listed on astronomy.me.uk compare to the ones in https://lweb.cfa.harvard.edu/~npatel/hornAntennaAASposterPDF2.pdf and https://www.ece.mcmaster.ca/faculty/nikolova/antenna_dload/
Here’s a side-by-side comparison of horn-antenna dimensions for hydrogen-line (≈1420 MHz, λ ≈ 21 cm) observation from SETI League / astronomy.me.uk recommendations and the academic designs referenced in the Harvard/McMaster…
What is maximum flare angles of hydrogen line horn antennas before the antenna develops problems?
Short answer first, then the nuance. TL;DR (rule-of-thumb) For 1420 MHz hydrogen-line pyramidal horns: That’s why almost all serious 21 cm horns cluster around 15–25°. What “problems” actually appear —…
Two successive massive complex SIDs today 1/2/2026, representing a sequence of multiple solar flares arriving at Earth
Just to finish off my posts on sudden ionospheric disturbances, there were two massive complex ones closely following on from each other today, representing a series of solar flares hitting…