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;
32 Cards in this Set
- Front
- Back
|
Define each band of the electromagnetic spectrum
|
ELF- up to 300hz. one way subs comm
Voice Frequency-300hz-3mhz VLF-3mhz-30mhz LF-30mhz-300mhz MF-300mhz-3khz HF-3khz-30khz VHF-30khz-300khz UHF-300khz-3ghz SHF-3ghz-30ghz EHF-30ghz-300ghz |
|
|
Frequency
|
Nº of waves cycles per second
|
|
|
Wavelength
|
Distance in space occupied by one cycle of radio wave at any given instant
|
|
|
Ducting
|
Trapping of an RF wave between 2 layers of the earth atmosphere
|
|
|
Refraction
|
the bending of an RF waves as the waves pass trough mediums of different density
|
|
|
Multiplexing
|
method for transmitting two or more signals over common carrier
|
|
|
modulation/demodulation
|
taking voice or sounds and change them into radio waves. demodulations is the reverse.
|
|
|
Bandwidth
|
Difference between lower & upper frequencies.
|
|
|
keying
|
Inserting noise or data onto frequency
|
|
|
Azimuth angle
|
angle measured clockwise from true north in the horizontal plane.
|
|
|
Elevation Angle
|
angle between the horizontal plane and the line of sight
|
|
|
Radio waves
|
an energy wave generated by a transmitter
|
|
|
propagations path
|
the way in which waves travel though the atmosphere
|
|
|
USB-upper sideband
|
all frequencies above the carrier. voice comms
|
|
|
LSB-Lower sideband
|
all frequencies below the carrier.
|
|
|
CW-continuous wave
|
on/off keying
|
|
|
AM-Amplitute modulations
|
varying amplitude of signal
|
|
|
FM-Frequency modulations
|
varying frequency of signal
|
|
|
PRI-Pulse repetition Interval
|
time between pulse
|
|
|
PRF-Pulse repetition Frequency
|
frequency rate of pulse transmitted
|
|
|
RF-Radio Frequency
|
rate of oscilation between 30khz-300ghz
|
|
|
BW-bandwidth
|
Specified for each radar
|
|
|
CW-Cotinuous Wave
|
Detect change in frequency reflected from target
|
|
|
PW-Pulse Width
|
Duration of pulse
|
|
|
Scan Rate
|
movement of a radar bean to cover define pattern
|
|
|
Air search
|
Position, course, speed of Airtarget
|
|
|
Surface Ssearch
|
Detect bearing of surface target
|
|
|
Fire control
|
provides positional data on target
|
|
|
OPELINT and TECHELINT
|
operational Intelligence-concerned with operational aspect. location, movements, tactics. Technical Intelligence. Concerned with technical aspect of foreign non-communications emitters
|
|
|
Half-duplex
|
Both sides of comms. One at the time
|
|
|
Duplex
|
Both sides of comms simultaneously
|
|
|
Simplex
|
Single channel. one way comms
|
