RADAR
ELECTROMAGNETIC WAVES
SOUNDERS
SPEED LOGS
RADIO
100
This refers to the distance the RADAR is "looking", or the distance to a target.
What is RANGE.
100
A complete change in the current; from positive to negative and back to positive.
What is a Cycle
100
The abbreviation is SONAR
What is SOund Navigation And Ranging
100
A type of mechanical speed log.
What is a paddle wheel or taff rail log.
100
This is when someone intentionally interferes with a broadcast signal.
What is Jamming.
200
What does "RADAR" stand for?
What is RAdio Detection And Ranging
200
1,000,000 cycles per second.
What is Megahertz - GHz
200
Describes the shape of the wave as it, or "sounding" as it gets deeper.
What is conical.
200
Results when the source of waves is moving.
What is the Doppler Effect.
200
The base signal of all transmitting radio systems.
What is a carrier wave.
300
10 cm wave length / 3 GHz
What is S - Band RADAR
300
The relation between frequency and wavelength.
What is inversely proportional
300
This refers to the weakening of the wave energy.
What is attenuation.
300
The type of frequency received from behind the ship as it moves forward.
What is lower frequency.
300
A process of modifying the wave length to encode information on the radio wave.
What is frequency modulation.
400
A RADAR functioning mode that is not Stabilized.
What is Head Up RADAR.
400
The flow of electrons
What is electicity
400
Effects the accuracy of the sounding. Can be caused by rolling or pitching.
What is angle of incidence.
400
The type of speed log arrangement that is useful for both speed of advance and in docking.
What is dual axis.
400
One of the most influential factors regarding the distance a ground wave can effectively travel.
What is antennae height.
500
The Gain adjustment on RADAR, abbreviated STC.
What is Sensitivity Time Control
500
A range of frequencies between 30 MHz and 300 MHz. Used for some radio communications.
What is very high frequency - VHF
500
Roughly, the speed of sound through water.
What is 1500 m/s.
500
This is the reference for speed when depths are too deep for echos to return from the ocean bed.
What is speed through the water.
500
The ability of the receiver to reproduce the original characteristics of a received signal as clearly and complete as possible
What is fidelity.
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