(F)Element 8-45 Equipment Faults-2

Question 1

A circuit card in a RADAR system has just been replaced with a spare card. You notice the voltage level at point E in Fig. 8F12 is negative 4.75 volts when the inputs are all at 5 volts. The problem is

Answer 1

The 50 K resistor has been mistakenly replaced with a 25 K resistor.

Question 2

A defective crystal in the AFC section will cause:

Answer 2

Bright flashing pie sections on the PPI

Question 3

The RADAR display has sectors of solid video (spoking). What would be the first thing to check?

Answer 3

For interference from nearby ships.

Question 4

45F4 In the circuit contained in Fig. 8F12, there are 5 volts present at points B and C, and there are zero volts present at points A and D. What is the voltage at point E?

Answer 4

-1.5 Volts.

Question 5

If the TR tube malfunctions

Answer 5

The receiver might be damaged.

Question 6

The indicated distance from your own vessel to a lighthouse is found to be in error. What circuit would you suspect?

Answer 6

Range ring oscillator.