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FAQ

Satellite-based search-and-rescue, Part 2: Ground segment and transmitter beacons

March 15, 2022 By Bill Schweber

A sophisticated satellite-based system allows pinpointing a person’s location in a dangerous, isolated situation on land or sea. It thus hopefully speeds their subsequent rescue in many cases. Over one million emergency beacons are in use worldwide, all operating at 406 MHz (with some exceptions, called out below). Cospas-Sarsat does not manufacture or sell beacons. […]

Filed Under: Aerospace and Defense, Applications, FAQ, Featured, microcontroller Tagged With: FAQ

Satellite-based search-and-rescue, Part 1: The overall system

March 14, 2022 By Bill Schweber

A sophisticated satellite-based system allows pinpointing a person’s location in a dangerous, isolated situation on land or sea. It thus hopefully speeds their subsequent rescue in many cases. You’ve undoubtedly seen or read stories about someone miraculously recused at sea or in some relatively uninhabited, remote part of the Earth, without a way to call […]

Filed Under: Aerospace and Defense, Applications, FAQ, Featured Tagged With: FAQ

Reaction wheels ensure satellites maintain the right attitude: Part 2

March 3, 2022 By Bill Schweber

Electrically driven reaction wheels use conservation of angular momentum to keep a satellite pointed in the right direction, eliminating the need for fuel-powered and limited thrusters. Part 1 was an introduction to reaction wheel basics. This part continues the investigation into their performance and construction. Physics and analysis Although the basic principle of reaction wheels […]

Filed Under: Aerospace and Defense, Applications, FAQ, Featured, Uncategorized Tagged With: FAQ

Reaction wheels ensure satellites maintain the right attitude: Part 1

March 2, 2022 By Bill Schweber

Electrically driven reaction wheels use conservation of angular momentum to keep a satellite pointed in the right direction, eliminating the need for fuel-powered and limited thrusters. Orbiting satellites usually must maintain a precise and stable orientation for various reasons:  to keep their cameras or radar pointed at their Earth targets or to keep their telescopes […]

Filed Under: Aerospace and Defense, Applications, FAQ, Featured Tagged With: FAQ

Saving energy with MCU power management

February 15, 2022 By Masamitsu Muratani

MCU low-power features such as built-in energy harvesting help optimize applications where long battery life is important. Masamitsu Muratani, Renesas The spectacular growth of the Internet of Things (IoT) is driving the need for devices that are smarter, faster, and can last for long periods on small and inexpensive batteries. To meet such requirements, Renesas […]

Filed Under: Applications, Embedded, FAQ, Featured, IoT Tagged With: FAQ, renesaselectronicscorporation

How to extend, boost and repeat Wi-Fi signals

February 4, 2022 By Jeff Shepard

Since the U.S. Federal Communications Commission (FCC) limits Wi-Fi transmitter power, it’s often necessary to increase the range of Wi-Fi signals using some signal boosting/extending technology. But transmit power is only half of the equation. Wi-Fi connections are always bidirectional and symmetrical. When working to extend Wi-Fi signals, the bidirectional nature of the connection is […]

Filed Under: Applications, FAQ, Featured, microcontroller, Wifi, Wireless Tagged With: FAQ

The basics of Wi-Fi security and encryption

February 3, 2022 By Jeff Shepard

Wi-Fi security has significantly improved over the years from initially being more aspirational than real until today, where Wi-Fi 6 security is considered to be on a par with the security of 5G telephony. This FAQ will answer several questions related to Wi-Fi security and encryption: What’s the difference between WEP, WPA, WPA2, and WPA3? […]

Filed Under: 5G, Applications, FAQ, Featured, Security, Wifi, Wireless Tagged With: FAQ

What to consider when selecting a Wi-Fi antenna

February 1, 2022 By Jeff Shepard

Antennas are a critical part of the link budget in all wireless communications applications, including Wi-Fi. In addition to the numerous antenna performance and link budget issues in wireless communications, there are general architectural challenges. The architectural options are the focus of this FAQ, including; long-distance versus local Wi-Fi and the use of directional vs. […]

Filed Under: Applications, FAQ, Featured, Wifi, Wireless Tagged With: FAQ

Wi-Fi by the numbers

January 31, 2022 By Jeff Shepard

This FAQ briefly reviews the generations of Wi-Fi and backward compatibilities, looks at the different frequency bands used by the latest Wi-Fi specifications, and reviews the bandwidths offered by various Wi-Fi implementations. The first five generations of Wi-Fi focused on evolutionary and incremental advancements and backward compatibility. Wi-Fi 6 changed that trajectory and is a […]

Filed Under: Applications, FAQ, Featured, Wifi, Wireless Tagged With: FAQ

Designing voice recognition into IoT devices

January 25, 2022 By Vikram Shrivastava

More and more user interfaces now consist of a conversation. New development hardware makes it easier to ‘talk’ to devices without physically touching anything. Vikram Shrivastava, Knowles Corp. More and more IoT devices these days will understand what you say when you talk to them. Voice is still in the early phases of adoption, however, […]

Filed Under: Applications, FAQ, Featured, IoT Tagged With: FAQ, knowlescorporation

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