5A Flashcards
___ allows the antenna to continuously peak on the satellite’s beacon with minimal drifting.
Satellite tracking
Without tracking on antennas, ___ would constantly have to check and adjust terminals to keep a nominal signal-to-noise ratio.
operators
The following describes which antenna?
- 2.4-meter (8ft) dish with an offset feed
- It operates in all four bands (C, X, Ku, Ka)
- reflector consists of an aluminum support structure, reflector center hub, eight (8) reflector panels (matched marked) cut from one piece of aluminum, and four (4) backplane struts.
- All reflector panels are calibrated by the manufacturer (if one is damaged the whole antenna must be replaced).
- Each band has its own feed horn and LNA mounted on the feed boom.
- The Tri-Band HPA must be mounted to the feed boom for C, X, Ku Bands.
- The HPA must be changed out for Ka-band use.
Small Aperture Antenna (SAA)
The following describes which antenna?
- 3.9-meter (13ft)
- completely self-contained transit (transport) case-based antenna subsystem
- The antenna is capable of non-simultaneous operation in the C,
X, Ku, and Ka frequency bands. - The antenna is contained in nine (9) ruggedized transport cases weighing a total of 1,862 pounds.
- is equipped with all the appropriate interfaces and control capabilities to support continuous AN/TSC-179 GMT operations.
- The GMT hardware integration kit is contained in four (4) additional transport cases weighing a total of 652 pounds.
Large Aperture Antennas (LAA)
The following describes which antenna?
- a large aperture antenna at 4.9 meters (16ft) diameter
- is designed to operate over C-, X-, and Ku-bands.
- operates worldwide with any spacecraft of the Defense Satellite
Communications System (DSCS), DSCS III, North Atlantic Treaty Organization (NATO), NATO IV, and Skynet. - The GMT includes a Tri-band HPA, X-band LNA, waveguide, and mounting brackets for the operation of the this antenna.
- The Antenna Control Unit (ACU) mounted in Case C or F will control the antenna.
- Requires 3-4 personnel to set up and tear down and can take 45min to 1 hour.
LAMDA (Large Aperture Multi-Band Deployable Antenna)
The following describes which antenna?
- The Trailer Mounted AS-4429/TSC Communications Antenna is commonly referred to as the Trailer Mounted Antenna (TMA)
- is a 4.9 meter (16ft), offset fed, trailer mounted, high gain, X-band antenna
- It requires 3-4 personnel to set up and tear down and can take 45min to 1 hour.
LHGXA (Lightweight High Gain X-Band Antenna)
The following describes which antenna?
- is a trailer mounted, 6.1 meter (20ft), center fed, high gain, X-
band antenna - It requires 6-8 personnel to set up and tear down and can take up to 1 to 2 hours.
OE-361 QRSA (Quick Reaction Satellite Antenna)
The following describes which acquisition and tracking principle?
___ is the primary tracking mode used in the ACU. It works by storing azimuth, elevation, and polarization. It uses geosynchronous satellite data gathered during step track and forms an ephemeris model. By using the ephemeris model combined with active tracking, ___ can predict where the satellite is in the event of signal loss.
OpTrack
The following describes which acquisition and tracking principle?
During ___ the antenna is moved to the initial satellite location and will search for any signal that breaches the established signal threshold. If it finds a strong signal, the antenna will begin to ___ (hill climb) looking for the strongest signal. If no signal meets or exceeds the threshold, the antenna will complete a box scan and ____ (hill climb) to the highest signal found. If no signal is found after the box scan, the antenna will give an indicator, “NO SIGNAL FOUND,” and return to the initial satellite location.
Step Track
The following describes which acquisition and tracking principle?
___ is an enhanced version of Optrack. Once the user enters in initial azimuth, elevation and polarization of the satellite, the antenna will jog to set position. Once it reaches the set position, it will begin an optrack or step track.
Position Track
The following describes which acquisition and tracking principle?
___ is also an enhanced version of Optrack, with the same concepts as position track. What makes ___ different is that instead of azimuth and elevation settings being entered, the geostationary satellite’s latitude and longitude are entered. Once it reaches the set position, it will begin an optrack or step track.
Geo Track
The following describes which acquisition and tracking principle?
___ works off the concept that geosynchronous satellites maintain a consistent rotation daily, which allows a record of the satellite’s position to be stored. After enough stored memory is acquired, the antenna will repeat its tracking principles day by day.
Memory Track
