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TV band devices or TVBDs are unlicensed radio frequency devices operating in the vacant channels or white spaces between US television channels in the range of 54 to 698 MHz. The rules defining these devices were announced on November 4, 2008, and published by the U.S. Federal Communications Commission (FCC) on November 14, 2008.
Dexcom was founded in 1999 by Scott Glenn, John Burd, Lauren Otsuki, Ellen Preston and Bret Megargel. [3] [4] In 2006, Dexcom received U.S. Food and Drug Administration (FDA) approval and launched the Dexcom STS Continuous Glucose Monitoring System, which is a three-day sensor that provides up to 288 glucose measurements for every 24 hours ...
Corner reflector UHF TV antenna from 1954 with bowtie dipole driven element. A corner reflector antenna is a type of directional antenna used at VHF and UHF frequencies. [1] [2] It was invented by John D. Kraus in 1938. [3] [4] It consists of a dipole driven element mounted in front of two flat rectangular reflecting screens joined at an angle ...
Canada had a similar analog TV termination date set to September 1, 2011 (except in some remote northern regions). [citation needed] It was feared that the US switch-off would cause millions of non-cable- and non-satellite-connected TV sets to "go dark". Viewers who did not upgrade, either to a television with a digital tuner or a set-top box ...
Since a rabbit ears antenna only covers the VHF bands, it is often combined with a UHF loop mounted on the same base to cover all the TV channels. This of course also depends by country and region: for example in the UK and Ireland, terrestrial TV broadcasts are only on the UHF band, meaning that a loop antenna is necessary and the rabbit ears ...
A solution built by U.S. firm GlySens, aimed to remove the need for an external reader by creating a sensor that could be implanted under the skin, that directly transmitted glucose values to an external app. As of August 2023, this undertaking has stalled and the system has not been approved anywhere and the company is defunct.
Slotted array UHF television broadcasting antenna. As shown by H. G. Booker in 1946, from Babinet's principle in optics a slot in a metal plate or waveguide has the same radiation pattern as a driven rod antenna whose rod is the same shape as the slot, with the exception that the electric field and magnetic field directions are interchanged; the antenna is a magnetic dipole instead of an ...
A digital TV converter box. A digital television adapter (DTA), commonly known as a converter box, DTV converter , or decoder box, is a television tuner that receives a digital television (DTV) transmission, and converts the digital signal into an analog signal that can be received and displayed on an analog television set.