ЧТО ОЗНАЧАЕТ СЛОВО PRESELECTOR
механизм предварительного выбора
Для других целей см. Преселектор. Предселектор представляет собой радиотехнический термин для электронного устройства, которое вставлено между антенной и приемником, ограничивая диапазон частот, которые могут быть применены к нему. Настройка на требуемую частоту удерживает узкую полосу преселектора в центре на рабочей частоте, отклоняя или уменьшая сигналы нежелательных помех вне диапазона. Кроме того, преселектор может также защищать чувствительный вход приемника от повреждений, вызванных постоянными и сильными сигналами от соседних передатчиков. Он улучшает производительность почти любого приемника, но особенно полезен для тех, у кого широкополосные интерфейсы, подверженные перегрузке, такие как сканеры или средние приемники. Необходима дополнительная фильтрация, потому что передняя часть приемников, соответствующая усилителям мощности и микшеру, имеет ограниченный динамический диапазон. Эти схемы имеют ограничение на количество радиочастотной энергии, с которой они могут справиться без перегрузки. Если передние перегрузки, производительность приемника сильно снижена или даже повреждена.
Значение слова preselector в словаре английский языка
Определение преселектора в словаре - это система, которая автоматически соединяет вызывающего абонента с свободной линией.
КНИГИ НА АНГЛИЙСКИЙ ЯЗЫКЕ, ИМЕЮЩЕЕ ОТНОШЕНИЕ К СЛОВУ «PRESELECTOR»
Поиск случаев использования слова
preselector в следующих библиографических источниках. Книги, относящиеся к слову
preselector, и краткие выдержки из этих книг для получения представления о контексте использования этого слова в литературе на английский языке.
Short-Wave. Preselector. To improve reception greatly, insert this preselector
between antenna and receiver HOW TO WIND THE COILS *4l/2 T. No. 22 bare.
The circuit is extremely simple. Total cost of parts is less than five dollars Top
view.
2
RF Front-End: World Class Designs: World Class Designs
Preselector. The circuit in Figure 6.8 is a VHF preamplifier that uses two JFET
devices connected in cascode, i.e., the input device (Q1) is in common source
and is direct coupled to the common gate output device (Q2). In order to prevent ...
3
RF Components and Circuits
receiver. preselector. The circuit in Fig. 4.8 is a VHF preamplifier that uses two
JFET devices connected in cascode, i.e. the input device (Q1) is in common
source and is direct coupled to the common gate output device (Q2). In order to
prevent ...
4
Operator and organizational maintenance manual, radar set ...
Table 5-3. Preselector Servo Alinement Procedures — Continued 3 4 1- Synchro
B2 2— Rl holddown screws 3 - Resistor Rl 4— B2 hold-down screws Table 5-U-
Stabilizer Vernier Adjustment Procedures Step Operation Corrective procedure.
United States. Dept. of the Army,
1979
5
Modern Communications Receiver Design and Technology
Antenna 455 kHz IF Amp Detector Mixer Tracking preselector (LO) LO Local
oscillator 500 kHz 30 MHz Figure 4.1 Simple block diagram of a general
coverage single conversion superheterodyne receiver. Note that the preselector
tracks ...
6
Microwave Measurements, 3rd Edition
RF input YIG filter Mixer X1 X1X1X1 X2 X2X2X2 X3 X3X3X3 X4 X4X4X4 IF
output Local oscillator Figure16.9 Microwave spectrum analyser with a tracking
preselector Notonlydoesthisonesignalmixwitheachoftheharmonics
ofthelocaloscillator ...
R.J. Collier, A.D. Skinner,
2007
7
The Technician's Radio Receiver Handbook: Wireless and ...
6.1 Use of a preselector or preamplifier with a receiver. RECEIVER the radio's
front-end tuning to the mixer, it will appear in the output as a valid signal. A cure
for all these problems is a little circuit called the active preselector. A preselector
...
8
Integrated Microwave Front-Ends with Avionics Applications
The total dimensions of the preselector are 5 in. × 2 in. × 0.5 in. Figure 10.4(b)
illustrates the frequency response of the tunable preselector for various varactor
tuning voltages. As the filter tunes from 962 to 1213 MHz, the 3-dB BW varies
from ...
9
WIDE DYNAMIC RANGE VHF
PRESELECTOR.
Simultaneous operation of a transmitter and receiving device in close proximity to each other results in receiver desensitization and distortion due to cross-modulation effects.
Joseph M. GIANNOTTO, Eugene J. Chabak, ARMY ELECTRONICS COMMAND FORT MONMOUTH N J.,
1966
10
Quantitative Analysis of Cognitive Radio and Network Performance
Preselector settings = PSS = log ( f high f low ) log 1 + BW 2 1 − (11.1)
BW 2 where: PSS Number of preselector settings available Lowest frequency
covered by preselector Highest frequency covered by preselector flow fhigh BW ...
НОВОСТИ, В КОТОРЫХ ВСТРЕЧАЕТСЯ ТЕРМИН «PRESELECTOR»
Здесь показано, как национальная и международная пресса использует термин
preselector в контексте приведенных ниже новостных статей.
Caterpillar 789D Mining Truck: Test Drive
We started out with the preselector in 5th gear, then threw it into 6th as we approached the 789D's top speed of about 35 mph. Each gear ... «PickupTrucks.com, Июн 15»
Vincent Black Shadow & Linto 500 head H&H Classic Auctions bill
... this Ferret seems like a bargain considering the lifetime intimate relationship you'll have with the preselector gearbox and all the friends you'll ... «Gizmag, Апр 15»
The Ill-Fated 1930s Racing Tech That's Mounting a Comeback
The 1931 Bugatti Type 51 (shown here at the 2007 Goodwood Revival Meeting) was one of many vehicles that used the preselector manual ... «Wired, Фев 15»
Barry O'Farrell's demise features in suspicious ALP Wollongong …
Cunningham MP Sharon Bird, whose electorate overlays the state seat Wollongong, said as a preselector on Saturday she could not comment ... «Sydney Morning Herald, Дек 14»
Spectrum analyzer spans 6GHz for less than $3000
Devine explained that using a preselector would have made achieving their SFDR goals easier, but the tradeoff would have been lower DANL ... «EDN.com, Июн 14»
Labor split by selection fallout
Mr McMahon won 128 preselector votes against Mr O'Brien's 101 votes after preferences, while a former staffer to Environment Minister Tony ... «The Australian, Апр 13»
Battle for Barton will be decided by mosque's support
His brother Kamel Mousselmani is an ALP preselector. Barton bid: Former Hurstville mayor Steve McMahon. Photo: John Veage. The group ... «Sydney Morning Herald, Апр 13»
Former ACT Lib Senator now eligible to vote in preselection
Mr Winnel, local party's greatest fund-raiser managed to register as a preselector on February 28 on his fourth attempt. Mrs Reid declined to ... «The Canberra Times, Мар 13»
Voting in doubt at two more branches
''I really have sympathy for all members who find out they are not eligible to be a preselector. It is disappointing for them, for me and for the ... «The Canberra Times, Фев 13»
Rare Daimler barn find
... six-cylinder engine allied to the traditional fluid flywheel and preselector transmission. The Sports Special had twin-carburettors and 85bhp to ... «Classic Cars for Sale, Янв 13»