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Amateur television (ATV) repeaters are used by amateur radio operators to transmit full motion video. The bands used by ATV repeaters vary by country, but in the US a typical configuration is as a cross-band system with an input on the 33 or 23 cm band and output on 421.25 MHz or, sometimes, 426.25 MHz (within the 70 cm band ).
In same-band repeaters, isolation between transmitter and receiver can be created by using a single antenna and a device called a duplexer. The device is a tuned filter connected to the antenna. In this example, consider a type of device called a band-pass duplexer. It allows, or passes, a band, (or a narrow range,) of frequencies.
Diplexing is used to prevent intermodulation and keep reflected power to a minimum for each input transmitter and frequency.While diplexers can combine a relatively wide bandwidth, the major limitation comes with the antenna itself, which must be sufficiently wideband to accept all of the signals being passed through it, and transfer them to the air efficiently.
Emma McKeon, Australia's most decorated Olympian, announced her retirement from competitive swimming on Monday. McKeon holds the Australian record of 14 Olympic medals — six of them gold — won ...
Indexes ended lower on Thursday as traders focused on the coming jobs report. The data is expected to show the US economy added 214,000 new hires, a steep uptick from October's reading.
On February 2, 2019, Homebrew version 2.0.0 was released. [24] On September 21, 2020, Homebrew version 2.5.2 was released with support for bottle taps (binary package repositories) via GitHub Releases. [25] Version 3.0.0 was released almost exactly two years after 2.0.0, on February 5, 2021, and added official support for Macs with Apple ...
The Thermopop 2 features an auto-rotating, 1 ¼ inch backlit display, the ability to provide you with a temperature reading within 2-3 seconds, and an IP67 weather resistance rating. You won’t ...
A microwave cavity or radio frequency cavity (RF cavity) is a special type of resonator, consisting of a closed (or largely closed) metal structure that confines electromagnetic fields in the microwave or RF region of the spectrum. The structure is either hollow or filled with dielectric material. The microwaves bounce back and forth between ...