Sensors 6

Question 1

What are the components of the AN/APS 504?

Answer 1

1. Antenna
2. Waveguide pressurization system
3. Power supply
4. Receiver/Transmitter
5. Remote Radar Interface Unit (RRIU)
6. Nav Training System Computer
7. Synchronizer Processor Converter Unit (SPCU
8. Pilot’s control panel
9. 20.1’’ LCD
10. ATS control

Question 2

Describe Rx/Tx

Answer 2

a. 9375 +/- 7 MHz or 9310 MHz
b. Min 80 KW, normal 100 KW
c. RADAR uses lower sideboard

Question 3

Describe antenna

Answer 3

a. 14 x 42 inch flat plate planar array
b. 360 degrees rotations capability
c. IRU gives attitude to keep antenna stationary (up to 20 degrees from horizontal) when turning, you keep your image.
d. Manual tilt control = +/-16 degrees

Question 4

Describe Power Supply

Answer 4

a. 115V DC that inverters change to AC

b. RADAR has 5 Circuit Breakers

Question 5

Describe RRIU (Remote Radar Interface Unit)

Answer 5

a. Transmits ctrl signals to RADAR

b. Takes inputs from NTS and PCU

Question 6

Describe SPCU (Synchronizer Processor Converter Unit)

Answer 6

a. Overall RADAR system timing+ctrl
b. Supplies Tx with command + ctrl sigals
c. Rx video inputs from Rx
d. Produces PRF

Question 7

Describe the waveguide Pressurization System

Answer 7

a. 20 PSI (max) N2 in waveguide to prevent arcing and electrical fires

Question 8

Range Selection/RPM…

Answer 8

3nm			30 RPM
6nm
12nm			
25nm
50nm NP
50nm WP		12 RPM
100nm
200nm			7.5 RPM

Question 9

What is the difference between the 50NP and the 50 PW?

Answer 9

50nm NP = HIGH PRF is for target definition and good target detection at close range by providing more target returns per scan.

50nm WP = LOW PRF keeps the average power high, provides the time to receives returns at longer ranges improving long range target detection.