Tag: wifi

via HACKADAY: Does WiFi Kill Houseplants?

Spoiler alert: No. To come to that conclusion, which runs counter to the combined wisdom of several recent YouTube videos, [Andrew McNeil] ran a pretty neat little experiment. [Andrew] has a not inconsiderable amount of expertise in this area, as an RF engineer and prolific maker of many homebrew WiFi antennas, some of which we’ve featured on these […]

Why Wi-Fi Channels 12, 13, and 14 Are Illegal in the USA

Wireless routers have fourteen different channels they can use for 2.4 GHz Wi-Fi, but three of them are off limits. Channels 12 and 13 are allowed in low-power mode, while channel 14 is banned—and only allowed in Japan. Wi-Fi uses radio waves to communicate over short distances. Wi-Fi networks can operate on several different channels to help reduce interference. Each […]

via HACKADAY: Umbrella and Tin Cans Turned into WiFi Dish Antenna

There’s something iconic about dish antennas. Chances are it’s the antenna that non-antenna people think about when they picture an antenna. And for many applications, the directionality and gain of a dish can really help reach out and touch someone. So if you’re looking to tap into a distant WiFi network, this umbrella-turned-dish antennamight be just the […]

via the ARRL: NTIA Targets Portion of 3.4 GHz Band for Potential Wireless Broadband Use

The National Telecommunications and Information Administration (NTIA) has identified 3450 to 3550 MHz for potential wireless broadband use. Amateur Radio has a secondary allocation of 3300 to 3500 MHz, sharing the spectrum with government radars; the popular “weak-signal” frequency is 3456.1 MHz. The NTIA oversees the use of spectrum by federal government agencies. “America is […]

via HACKADAY: AI Listens to Radio

We’ve seen plenty of examples of neural networks listening to speech, reading characters, or identifying images. KickView had a different idea. They wanted to learn to recognize radio signals. Not just any radio signals, but Orthogonal Frequency Division Multiplexing (OFDM) waveforms. OFDM is a modulation method used by WiFi, cable systems, and many other systems. In particular, they […]

PODCAST: This Week in Amateur Radio #990

This Week in Amateur Radio #990 Here is a summary of the news trending this week. February 17, 2018 This weeks edition, is anchored by, Chris Perrine, KB2FAF, Rich Lawrence, KB2MOB, Don Hulick, K2ATJ, and Jessica Bowen,KB2VWX. Produced and edited (and a little anchoring too) by W2XBS. Running Time: 1:13:40 Download here: http://bit.ly/TWIAR990 Trending stories in […]

via HACKADAY: Simple Scanner Finds the Best WiFi Signal

Want to know which way to point your WiFi antenna to get the best signal? It’s a guessing game for most of us, but a quick build of a scanning WiFi antenna using mostly off-the-shelf components could point you in the right direction. With saturation WiFi coverage in most places these days, optimizing your signal […]

via HACKADAY: A Terahertz Modulator

We’re all used to the changes in the properties of radio frequency systems as the frequency increases and the wavelength becomes shorter. The difference between the way an FM radio and a WiFi adapter behave with respect to their environments, for instance. But these are relatively low frequencies in the scheme of electromagnetic radiation, as […]

via HACKADAY: Visualization of a Phased Array Antenna System

Phased array antenna systems are at the cusp of ubiquity. We now see Multiple-Input Multiple-Output (MIMO) antenna systems on WiFi routers. Soon phased array weather radar systems will help to predict the weather and keep air travel safe, and phased array base stations will be the backbone of 5G which is the next generation of […]

via HACKADAY: A Lot Of WiFi Power, A Yagi, And A Sniper’s ‘Scope

Do you remember the early days of consumer wireless networking, a time of open access points with default SSIDs, manufacturer default passwords, Pringle can antennas, and wardriving? Fortunately out-of-the-box device security has moved on in the last couple of decades, but there was a time when most WiFi networks were an open book to any […]