High Frequency
what is the frequency range of HF?
3-30 MHz
what is a signal transmitted from an earth terminal TO a satellite called?
uplink
what is modulation?
Changing of from one state to another
"Mixing" signals to form a new output
what height is a geosynchronous orbit above the equator?
22,300 miles
how is HF Beyond line of sight communications possible?
the signal bounces of the ionosphere to its destination
what paperwork is submitted to gain access to the satellite network?
Satellite Access Request (SAR)
a carrier wave (carrier spike) is
an unmodulated signal
What beam coverage type is used to cover 1/3 of the earth surface?
Global Beam coverage
what is the wavelength for 5 MHz
60 meters
what does IW stand for
integrated waveform
What is the formula to find the wavelength of a given frequency?
wavelength = velocity / frequency
wavelength = speed of light (c or 300,000 Kms) / frequency
what frequency range does KU operate in?
12-18 GHz
What does ALE do?
automatically determines the best predetermined frequency to use
What does the signal to noise ratio measure
the amount of desired signal compared to the background noise
a resonant antenna is used for what?
1 specific frequency
geostationary orbits are above which man made imaginary line
the equator
What is a Dipole?
a dipole is center fed with 2 radiating elements
How is the radiation affected by the size of the reflectors.
The larger the surface area (larger the reflectors) the more narrow the beam width. (more directional)
describe the radiation pattern from a whip antenna
looks like a doughnut. (ratiates perpendicular to the antenna 360 degrees.
What imaginary lines are used to measure the position of geosynchronous satellites?
Longitude