CO OZNACZA SŁOWO PRESELECTOR
Preselector
W innych zastosowaniach zobacz Preselector. Preselekcja jest terminem radiowym dla urządzenia elektronicznego, który jest włożony pomiędzy antenę a odbiornik, ograniczając zakres częstotliwości, które mogą być zastosowane do niego. Dostrajanie żądanej częstotliwości utrzymuje wąską szerokość pasma preselektora na środku częstotliwości częstotliwości, odrzucając lub redukując niepożądane sygnały zakłócające poza pasmo. Dodatkowo preselektor może chronić wrażliwe wejście odbiornika przed uszkodzeniem spowodowanym przez statyczne i napięciowe i silne sygnały z pobliskich nadajników. Poprawia wydajność niemal każdego odbiornika, ale jest szczególnie przydatna dla tych, którzy mają szerokopasmowe front-endy, które są podatne na przeciążenie, takie jak skanery czy przeciętne odbiorniki. Potrzebne jest dodatkowe filtrowanie, ponieważ przednie odbiorniki, dopasowane przez wzmacniacze i miksery RF, mają ograniczony zakres dynamiczny. Obwody te mają ograniczenie do ilości energii RF, którą mogą obsługiwać bez przeciążania. Jeśli przeciążenie front-endu, wydajność odbiornika jest poważnie ograniczona lub nawet uszkodzona.
Definicja słowa preselector w słowniku
Definicja preselektora w słowniku to system, który automatycznie łączy dzwoniącego z wolną linią.
KSIĄŻKI POWIĄZANE ZE SŁOWEM «PRESELECTOR»
Poznaj użycie słowa
preselector w następujących pozycjach bibliograficznych Książki powiązane ze słowem
preselector oraz krótkie ich fragmenty w celu przedstawienia kontekstu użycia w literaturze.
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 ...
WIADOMOŚCI, KTÓRE ZAWIERAJĄ SŁOWO «PRESELECTOR»
Sprawdź, o czym dyskutuje się w prasie krajowej i zagranicznej oraz jak jest stosowane słowo
preselector w wiadomościach.
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, Cze 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, Kwi 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, Lut 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, Gru 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, Cze 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, Kwi 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, Kwi 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, Mar 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, Lut 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, Sty 13»