Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
49 Cards in this Set
- Front
- Back
|
WHAT IS THE PURPOSE OF THE SYNCHRONIZER IN A RADAR SYSTEM?
|
CONTROLS SYSTEM OPERATING AND TIMING
|
|
|
WHAT IS THE PURPOSE OF THE MAJORITY OF CIRCUITS IN A RADAR SYSTEM?
|
TIMING AND CONTROL
|
|
|
A SELF-SYNCHRONIZED RADAR SYSTEM OBTAINS TIMING TRIGGER PULSES FROM WHAT SOURCE?
|
TRANSMITTER
|
|
|
WHAT TYPE OF MULTIVIBRATOR CAN BE USED AS A RADAR MASTER OSCILLATOR?
|
FREE-RUNNING
|
|
|
IN AN EXTERNALLY SYNCHRONIZED RADAR, WHAT DETERMINES THE PRR OF THE TRANSMITTER?
|
THE MASTER OSCILLATOR
|
|
|
WHAT BASIC CIRCUITS MEET THE REQUIREMENT OF AN EXTERNALLY SYNCHRONIZED MASTER OSCILLATOR?
|
SINE-WAVE OSCILLATOR, SINGLE SWING BLOCKING OSCILLATOR, AND MASTER-TRIGGER (ASTABLE) MULTIBRATOR
|
|
|
NAME A DISADVANTAGE OF SINE-WAVE OSCILLATOR SYNCHRONIZERS.
|
IT REQUIRES ADDITIONAL SHAPING CIRCUITS
|
|
|
WHICH OF THE BASIC TIMING CIRCUITS PRODUCES SHARP TRIGGER PULSES DIRECTLY?
|
BLOCKING OSCILLATORS
|
|
|
WHAT ARE THE 2 BASIC TYPES OF TRANSMITTERS?
|
KEYED OSCILLATOR & POWER-AMPLIFIED CHAIN
|
|
|
WHAT CONTROLS TRANSMITTER PULSE WIDTH?
|
THE MODULATOR
|
|
|
IN ADDITION TO A FLAT TOP, WHAT CHARACTERISTICS MUST A MODULATOR PULSE HAVE?
|
STEEP LEADING AND TRAILING EDGES
|
|
|
WHAT TYPE OF MODULATOR IS MOST COMMONLY USED IN MODERN RADAR SYSTEMS?
|
LINE PULSED
|
|
|
WHAT 3 TYPES OF STORAGE ELEMENTS MOST OFTEN ARE USED IN MODULATORS?
|
CAPACITOR, ARTIFICIAL TRANMISSION LINE, OR PULSE FORMING NETWORK
|
|
|
WHAT CHARACTERISTIC IS DETERMINED BY THE TIME REQUIRED FOR A VOLTAGE WAVE TO TRAVEL FROM THE INPUT END OF AN ARTIFIED TRANMISSION LINE TO THE OUTPUT END AND BACK AGAIN?
|
PULSE WIDTH
|
|
|
WHAT TYPE OF TUBE BEST MEETS THE REQUIREMENTS OF A MODULATOR SWITCHING ELEMENT?
|
THYRATRON
|
|
|
WHAT MODULATOR ELEMENT CONTROLS THE RATE AT WHICH THE STORAGE ELEMENT CHARGES?
|
THE CHARGING IMPEDANCE
|
|
|
WHAT IS THE FREQUENCY RANGE OF MAGENTRON OSCILLATORS?
|
600-30,000 MEGAHERTZ
|
|
|
WHAT 2 FORMS OF INSTABILITY ARE COMMON IN MAGNETRONS?
|
MODE SKIPPING AND MODE SHIFTING
|
|
|
WHAT IS THE EFFECT ON MAGNETRON OPERATION IF HTE MAGNETIC FIELD STRENGTH IS TOO HIGH?
|
THE MAGNETRON WILL NOT OSCILLATE
|
|
|
WHAT IS THE TYPICAL FREQUENCY RANGE ABOTU THE CENTER FREQUENCY OF A TUNABLE MAGNETRON?
|
±5 percent
|
|
|
WHAT IS THE PRIMARY ADVANTAGE OF POWER-AMPLIFIER TRANSMITTER OVER KEYED-OSCILLATOR TRANSMITTERS?
|
FREQUENCY STABILITY
|
|
|
WHAT TYPE OF KLYSTRON IS USED AS THE FINAL STAGE OF A POWER-AMPLIFIER TRANSMITTER?
|
MULTICAVITY KLYSTRON
|
|
|
WHAT TRANSMITTER COMPONENT ALLOWS THE RADIATION OF A LARGE NUMBER OF DISCRETE FREQUENCIES OVER A WIDE BAND?
|
FREQUENCY SYNTHESIZER
|
|
|
WHAT IS THE RESULT OF PULSING A PULSED RF AMPLIFIER WHEN NO RF IS PRESENT?
|
OSCILLATIOINS AT AN UNDESIRED FREQUENCY
|
|
|
WHAT TYPE OF SWITCHES ARE USED AS DUPLEXERS?
|
ELECTRONIC
|
|
|
WHAT TUBE IN A DUPLEXER HAS THE PRIMARY FUNCTION OF DISCONNECTING THE RECEIVER?
|
TR TUBE
|
|
|
HOW MAY THE TR TUBE IONIZATION SPEED BE INCREASED?
|
APPLY KEEP-ALIVE VOLTAGE
|
|
|
THE ACTIONS OF THE TR AND ATR CIRCUITS DEPEND ON THE IMPEDANCE CHARACTERISTICS OF WHAT LENGTH OF TRANSMISSION LINE?
|
QUARTER-WAVELENGTH SECTION
|
|
|
DURING WHICH OF THE TRANSMIT OR RECEIVE CYCLES ARE BOTH THE TR AND ATR TUBES OF A PARALLEL CONNECTED DUPLEXER IONIZED (ARCING)?
|
TRANMIT
|
|
|
IN A SERIES CONNECTED DUPLEXER, WHAT TUBE (TR OR ATR), IF ANY, FIRES DURING THE RECEIVE CYCLE?
|
NEITHER FIRES
|
|
|
TO PROPAGATE ENERGY DOWN AN ARM OF HYBRID RING DUPLEXER, THE 2 FIELDS AT THE JUNCTION OF THE ARM AND THE RING MUST HAVE WHAT PHASE RELATIONSHIP?
|
180 DEGREES OUT OF PHASE
|
|
|
WHAT IS THE GREATEST LIMITING FACTOR IN A RECEIVER'S DETECTABLE RANGE?
|
NOISE
|
|
|
WHAT TYPE OF RECEIVER IS MOST OFTEN USED IN RADAR SYSTEMS?
|
SUPERHETERODYNE
|
|
|
WHAT IF FREQUENCIES ARE NORMALLY USED IN RADAR RECEIVERS?
|
30 OR 60 MEGAERTZ
|
|
|
WHICH COMPONENT OF THE RECEIVER PRODUCES THE SIGNAL THAT IS MIXED WITH THE RECEIVED SIGNAL TO PRODUCT THE IF SIGNAL?
|
LOCAL OSCILLATOR
|
|
|
WHAT RECEIVER CIRCUIT ACTUALLY PRODUCES THE IF FREQUENCY?
|
MIXER
|
|
|
THE IF AMPLIFIERS ARE CONNECTED IN WHAT AMPLIFIER CONFIGURATION?
|
CASCADE
|
|
|
WHICH RECEIVER COMPONENT CONVERTS THE IF PULSES TO VIDEO PULSES?
|
DETECTOR
|
|
|
WHICH OF THE 2 TYPES OF AUTOMATIC GAIN CONTROL, AGC OR IAGC, IS MOST EFFECTIVE IN RADAR USE FOR THE NAVY?
|
IAGC
|
|
|
IMMEDIATELY AFTER THE TRANSMITTER FIRES, STC REDUCES THE RECEIVER GAIN TO WHAT LEVEL?
|
ZERO
|
|
|
HOW DOES FTC AFFECT RECEIVER GAIN, IF AT ALL?
|
FTC HAS NO EFFECT ON RECEIVER GAIN
|
|
|
WHAT TYPE OF TARGET HAS A FIXED PHASE RELATIONSHIP FROM ONE RECEIVING PERIOD TO THE NEXT?
|
STATIONARY
|
|
|
WHAT IS THE PHASE RELATIONSHIP BETWEENT EH DELAYED AND UNDELAYED VIDEO?
|
OPPOSITE
|
|
|
WHEN A LARGE SIGNAL AND A SMALL SIGNAL ARE APPLIED TO A LIN-LOG AMPLIFIER AT THE SAME TIME, WHAT IS THE EFFECT ON THE SMALL SIGNAL?
|
AMPLIFICATION IS REDUCED
|
|
|
WHAT HAPPENS TO THE OVERALL GAIN OF A LIN-LOG AMPLIFIER AS EACH STAGE SATURATES?
|
DECREASES
|
|
|
A MONOPULSE RECEIVER HAS HOW MANY SEPARATE CHANNELS?
|
3
|
|
|
IF A TARGET IS ON THE BEARING AXIS OF THE RADIATED BEAM, WHA TIS THE INPUT TO THE BEARING IF CHANNEL?
|
0
|
|
|
WHAT CHARATERISTIC OF THE BEARING AND ELEVATION OUTPUT SIGNALS DETERMINES THE DIRECTION OF THE ANTENNA MOVEMENT?
|
PHASE
|
|
|
WHAT SIGNAL IS USED TO SYNCHRONIZE THE COHERENT OSCILLATOR TO A FIXED PHASE RELATIONSHIP WITH THE TRANSMITTED PULSE?
|
COHO LOCK PULSE
|
