8-41E: Antenna to Display Interface Flashcards
Antenna Systems (4 cards)
8-41E2
On a basic synchro system, the angular information is carried on the:
A. DC feedback signal.
B. Stator lines.
C. Deflection coils.
D. Rotor lines.
ANSWER B
Usually, 3 stator lines carry the angular information from the antenna to the indicator.
8-41E3
What is the most common type of antenna position indicating device used in modern RADARs?
A. Resolvers.
B. Servo systems.
C. Synchro transmitters.
D. Step motors.
ANSWER A
Early RADARs used synchro systems that were geared at a ratio of around 10:1 and required a cam and microswitch system at both the antenna and the indicator to insure that the antenna was in step with the indicator. Today, modern RADARs relay on a resolver circuit , which constantly keeps antenna alignment in sync with the indicator readout.
8-41E4
Which of the following statements about antenna resolvers is correct?
A. Most resolvers contain a rotor winding and a delta stator winding.
B. Resolvers consist of a two rotor windings and two stator windings that are 90 degrees apart.
C. The basic resolver contains a rotor winding and two stator windings that are 90 degrees apart.
D. Resolvers consist of a “Y” connected rotor winding and a delta connected stator winding.
ANSWER C
The resolver is a rotor-winding and two stator windings that are ninety degrees apart, continously yielding information on the travels of the rotating antenna.
8-41E6
RADAR antenna direction must be sent to the display in all ARPAs or RADAR systems. How is this accomplished?
A. 3-phase synchros.
B. 2-phase resolvers.
C. Optical encoders.
D. Any of the above.
ANSWER D
The modern ARPA RADAR system might employ synchros, resolvers, and optical encoders to reference the physical RADAR antenna direction to the scanned display. Any of these are found in ARPA systems.
