RADAR
ELECTROMAGNETIC WAVES
SOUNDERS
SPEED LOGS
The Atmosphere
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
A electromagnetic transmission that is line of sight and limited to transmission "horizon".
What is a ground wave.
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 atmosphere is sometimes viewed as two layers. One where the elements of the atmosphere are well mixed, and the outer layer where the elements are separated by their molecular weight. What is the name of this layer of separated elements?
What is the heterosphere?
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 sky wave reaches great distances due to its "bouncing" off an outer layer of the atmosphere. This "bouncing" off the atmospheric layer is ___________________.
What is refraction.
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
What is the area called between the furthest reach of a ground wave and the shortest distance of a sky wave?
What is the Skip Zone
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 frequency where transmitted waves will blast through the atmosphere regardless of their angle of incidence.
What is 30 megahertz.
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