How an inductor works
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An inductor is one of the simplest components in electronics, but its behaviour comes from a deep physical effect: a current creates a magnetic field, and changing that current induces…
How resonant radio frequency circuits work
How Resonant RF Circuits Work: Resonant RF (radio-frequency) circuits—also called LC resonant or tuned circuits—use an inductor (L) and a capacitor (C) to create a natural oscillation at a specific…
How does the radio frequency SAW filter in a Nooelec SAWBird LNA and filter?
In the SAWBird line of LNAs (e.g., for 1420 MHz, GPS, L-band), the SAW filter is the component that provides the ultra-narrow preselection that makes these modules so effective for…
What is spillover vs ground reflection in radio astronomy?
In a radio telescope’s noise budget, spillover and ground reflection are two distinct ways unwanted radiation enters your receiver. They’re related but not the same: Spillover Spillover is receiver noise…
How to generate a disc image from my Raspberry PI 4B?
You can get a Raspberry Pi disk image in a few different ways depending on what you mean: 1. Downloading an official Raspberry Pi OS image If you simply want…
What difference does choice of material make with regards to construction of antennas?
Material choice affects an antenna’s efficiency, bandwidth, durability, and mechanical practicality. Here’s a concise breakdown of what really matters: 1. Electrical Conductivity This is the biggest factor. High-conductivity metals (copper,…
Is it benefitial to ensure that low noise amplifier and filter (LNA) for hydrogen line observing is at a constant temperature?
Andrew Thornett: I could see potential benefit for having LNA at constant temperature. The easiest way to achieve that is to cool it below any likely outside temperature – avoiding…
What is most expensive low noise amplifier and/or filter available for hydrogen line radio astronomy?
Short answer: the most expensive single-component front-end parts used for 1.420 GHz (H-line) work are cryogenic HEMT/InP LNAs and the associated cryogenic front-end systems (LNA + cryostat + cryocooler). Top…
Pulsars don’t have a single “pulsar frequency” the way spectral lines do.
Pulsars don’t have a single “pulsar frequency” the way spectral lines do — instead they emit broadband radio noise with periodic pulses, and what we observe are: Here are the…