2-58. A total of how many test antennas are used in a tower
array?
1. One
2. Two
3. Three
4. Four
2-59. Which of the following test equipment is NOT nor-
mally used in collimation?
1. AN/SPM-9
2. AN/SPM-6
3. AN/SPG-51
4. AN/UPN-32
2-60. Shore-tower checks between overhauls may be
required by which of the following authorities?
1. PWO
2. CWAT
3. NAVSEA
4 . C E O
2-61. In track-receive axis collimation, what method is used
to determine the error between the track-receive axis
and the borescope axis of the AN/SPG-51C/D radar?
1. Angle-error null
2. Electronic null
3. Mechanical null
4. Tracking angle null
12
2-62. What minimum number of nulls and the borescope
readings should be taken to determine the collimation
error between the TR axis and the borescope axis?
1.
10
2.
20
3.
30
4.
35
2-63. What test equipment, if any, is required aboard ship
during track-transmit axis collimation?
1. AN/SPM-9
2. AN/SPM-6
3. AN/UPN-32
4. None
2-64. What method of measurement is used to detemine the
error between the CWI axis and the borescope axis of
the AN/SPG-51C/D radar?
1. Angle
2. Circle
3. Borescope plot
4. Beam-pattern plot
