Page:Electronics Technician - Volume 7 - Antennas and Wave Propagation - NAVEDTRA 14092.pdf/113

2-35. The adjustable stub on the AS-390/SRC uhf antenna is used to adjust what antenna characteristic?

1. The counterpoise angle
2. The input impedance
3. The radiation angle
4. The feed point

2-36. The OE-82B/WSC-I(V) antenna group uses what type of polarization?

1. Vertical
2. Horizontal
3. Right-hand circular
4. Left-hand circular

2-37. The AN/WSC-S (V) shore station antenna consists of what number of OE-82A/WSC-1 (V) assemblies?

1. 1
2. 2
3. 3
4. 4

2-38. What does the acronym LPI stand for?

1. Low power interference
2. Low probability of intercept
3. Low phase intercept
4. Last pass intercept

2-39. The reflectors for the AN/WSC-6 (V) are mounted on three-axis pedestals and provide auto tracking using what scanning technique?

1. Conical
2. Peripheral
3. Vertical
4. Horizontal

2-40. Antenna tuning is accomplished using what piece or pieces of equipment?

1. Couplers
2. Tuners
3. Multicouplers
4. All the above

2-41. Antenna multicouplers are used to match more than one transmitter or receiver to what number of antennas?

1. 1
2. 2
3. 3
4. 4

2-42. The AN/URA-38 antenna coupler is an automatic tuning system primarily used with which radio transmitter?

1. AN/WSC-3
2. AN/URT-23
3. AN/URC-8O
4. AN/FRT-84

2-43. The AN/SRA-57 coupler group operates in which of the following frequency ranges?

1. 2-6 Mhz
2. 4-12 Mhz
3. 10-30 Mhz
4. 40-60 Mhz

2-44. How many channels are provided with the AN/SRA-12 multicoupler?

1. 4
2. 5
3. 6
4. 7

2-45. What type of radar would use a truncated paraboloid reflector that has been rotated 90 degrees?

1. A surface search
2. An air search
3. A navigation
4. A height-finder

2-46. Of the following methods, which is NOT used to feed a cylindrical paraboloid reflector?

1. A linear array of dipoles
2. A slit in the side of a waveguide
3. A thin waveguide radiator
4. A quarter-wave stub

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