3B Flashcards
Satellite communications often operate within the ___ ___ ___ range because of its ability to pierce the atmosphere and reach space.
Super High Frequency (SHF)
Within the SHF part of the spectrum there are five common bands into which SATCOM terminals typically fall:
C, X, Ku, K and Ka-Bands
___-Band was one of the first and original range of frequencies used in satellite communications.
C
It can operate on satellites such as, INTELSAT, EUTELSAT, DOMSAT, and PANAMSAT.
C-Band
The C-Band typically uses the frequency range of
4 GHz – 8 GHz
How is C-Band polarized?
Linearly or circularly
Due to C-Band’s frequencies being in the lower end of satellite communications, it
employs a ___ wavelength and often ___ parabolic dishes/feed horns.
longer
larger
C-Band is highly resistant to ___ fade effects making it desirable in challenging environments, but it offers lower throughput compared to higher frequency bands.
rain
This frequency band is also utilized for weather radars, Wi-Fi version 802.11a, TV networks, and some radio networks in the 5 GHz range.
C-Band
___-Band is primarily used in military applications
X
How is X-Band polarized?
Circularly
The X-Band typically uses the frequency range of
8 GHz-12 GHz
This band is used in satellites
such as Defense Satellite Communication System (DSCS) II/III, North Atlantic Treaty
Organization (NATO) 3/4, and Wideband Global SATCOM (WGS).
X-Band
Other applications that use
this band are civil, military, and government weather radars, air traffic control, and vehicle speed detection for law enforcement.
X-Band
Ku-Band uses the frequency range of:
12 GHz – 18 GHz
What does KU stand for?
Kurz Under
This band is highly utilized by various satellites including, INTELSAT, EUTELSAT, DOMSAT, and PANAMSAT.
Ku-Band
This band falls into the lower part of the original NATO K-band.
Ku-Band
Other applications that use this band are digital television, radio astronomy, radio navigation, and commercial aircraft.
Ku-Band
While this band offers more
throughput and a smaller terminal footprint than its predecessors, it can be affected by ___ ___ and requires more precise pointing due to its narrower focus beam.
rain fade
K-Band utilizes the frequency range of
18 GHz – 27 GHz
K-Band has high atmospheric
attenuation and is not useful for:
long distance communications
Ka-Band uses the frequency range of
27 GHz – 40 GHz
How is Ka-band polarized?
Circularly
Ka-band’s main usage is for ___ communications.
satellite
It will work on the WGS (military) constellation and on INTELSAT and EUTELSAT (commercial)
constellations.
Ka-Band
Ka-Band’s total bandwidth is more than ___ times that of C-band, and its total throughput is the highest out of the discussed frequency bands.
five
Due to K-Bands very short wavelength, ___ ___ causes significant reliability issues.
inclement weather
