These are effectively a higher performance version of a diplexer, typically with a narrow split between the two frequencies in question ( typically around 2 %-5 % for a commercial two-way radio system ).
22.
The principle that multiplexer filters may be matched when joined together by modifying the first few elements, thus doing away with the compensating resonators, was discovered accidentally by E . J . Curly around 1968 when he mistuned a diplexer.
23.
A " diplexer " allows two transmitters on different frequencies to use one antenna, and is common in installations where one repeater on 2 m and a second on 440 MHz share one feedline up the tower and one antenna.
24.
W262CE has an effective power of 130 watts, while all of the others ( including WNCC itself ) are at or very close to 115 watts at the same height, indicating that they all share a single radio antenna through a diplexer.
25.
In that situation, the diplexer consists of a lowpass filter connecting ports L and S and high pass filter connecting ports H and S . Ideally, all the lowband signal power on port L is transferred to the S port and vice versa.
26.
The antenna feed is usually considered to be all the components between the beam-shaping part of the antenna and the receiver's first amplifier ( called the RF front end, the feed horn, orthomode transducer, polarizer, frequency diplexer, waveguide, waveguide switches, rotary joint, etc.
27.
This is usually to enable two signals to be transmitted simultaneously on the same communications channel, or to allow transmitting on one frequency while receiving on another . ( This specific use of a diplexer is called a duplexer . ) The same device can be used to separate the signals again at the far end of the channel.
28.
Currently, the wireless communication is still performed with " half-duplex ", where either the signals are transmitted or received at different time frames, if at the same frequency ( typically in radar ), or the signals are simultaneously transmitted and received at different frequencies ( realized by a set of filters called a diplexer ).
29.
Stations can transmit HD Radio through their existing antennas using a diplexer as on AM, or are permitted by the FCC to use a separate antenna at the same location, or at a site licensed as an analog ratio of signal strength to each other so as not to cause destructive interference with each other at any given location where they may be received.
30.
A new magnetron was developed; this operated at 54 cm ( 470 MHz ) with a pulse-power increased to 15 kW . A gas-discharge transmit-receive device ( a diplexer ) was developed for isolating the receiver from the direct transmitter pulse, thus allowing the use of a common transmitting-receiving structure . ( A similar development had been made for the " RUS-2 " common antenna, but this would not have been suitable for the microwave " Rubin " .)
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