Unit 6-2

Front 1

(a04) The an/tps-75 radar set provides information on aircraft for a radius of

Back 1

240 nautical miles

Front 2

(ao5) the maximum degree of ground slope for the radar antenna pallet and equipment shelter is

Back 2

6 degrees

Front 3

(a05) This north mark alignment insures that your antenna is oriented to within

Back 3

+- 1 degree of north

Front 4

(a06) What is the relationship of the STALO frequency to the xmit frequency in the an/tps-75 radar?

Back 4

the STALO is 32 MHz below the xmitted frequency

Front 5

(a06) The range and azimuth correlation of IFF and radar returns is accomplished in the

Back 5

post processor

Front 6

(a06) HOw many modes of communication are provided to the operator in the an/tps-75 radar by the communications system?

Back 6

5

Front 7

(a07) The radar initialization function in the an/tps-75 is performed...

Back 7

automatically at the system power-up

Front 8

(a07) The serial communications interface, part of the radar control function in the an/tps-75, provides a link between the radar control unit and the

Back 8

six system microprocessors

Front 9

(a08) What is the frequency of the master clock signal provided by the frequency generator to the processor timing generator in the an/tps-75 radar?

Back 9

32 MHz

Front 10

(a08) What are the PRT modes for the an/tps-75 radar?

Back 10

fixed, staggered, or burst

Front 11

(a08) In the an/tps-75 radar, a JATS jump signal is generated every

Back 11

405 degrees of antenna rotation

Front 12

(a09) The STALO RF output from the an/tps-75 frequency generator is sent to the RF receivers for...

Back 12

RF to IF downconversion

Front 13

(a09) What type of amplifier is used in the an/tps-75 xmitters driver circuit?

Back 13

pulsed TWT amplifier

Front 14

(a10) What an/tps-75 circuit ensures the PFN output pulse has the same potential from PRT to PRT?

Back 14

PFN shunt regulator

Front 15

(a10) What two circuits generate the high voltage enabling pulse for the an/tps-75 FPA?

Back 15

trigger amplifier and PFN

Front 16

(a11) One purpose for the an/tps-75 radiate control interlock network is to...

Back 16

ensure a definite turn-on sequence for the transmitter

Front 17

(a11) How many faults are required to lock out the automatic reset circuit of the an/tps-75 radiate control interlock network?

Back 17

4

Front 18

(a12) The an/tps-75 waveguide is pressurized and dehydrated to...

Back 18

keep out moisture and prevent arcing

Front 19

(a12) What is the pressure range in the an/tps-75 waveguide?

Back 19

24-27 psi

Front 20

(a12) What is used to dehydrate the an/tps-75 waveguide air?

Back 20

a desiccant canister

Front 21

(a13) What type of antenna is used to recieve the side lobe reference signal in the an/tps-75?

Back 21

Omnidirectional

Front 22

(a12) What is used to dehydrate the an/tps-75 waveguide air?

Back 22

a desiccant canister

Front 23

[A04] 1. What is the only required input to the radar?

Back 23

400hz primary power

Front 24

[a04] 2. With what does the radar set interface?

Back 24

AN/TYQ-23 operations module

Front 25

[a04] 3. In the transit configuration, what does the shelter package contain?

Back 25

All of the electronic equipment including the heat exchanger, two air conditioners, and the IFF/SIF antenna

Front 26

[a05] 1. Define radar screening.

Back 26

The blocking of all or a portion of the radar beam by an obstacle.

Front 27

[a05] 2. Give 2 reasons for clearing a zone around radar and communications antennas.

Back 27

1. For safety (to prevent accidental damage to each antenna by vehicles and to provide a fire safety zone)
2. For efficient RF propagation and communications

Front 28

[a05] 3. What item is required before a site survey is started for a CRC or CRE?

Back 28

A radar coverage diagram.

Front 29

[a05] 4. What is the major reason radar antennas are placed at the highest elevation?

Back 29

To prevent interference with the radiation pattern.

Front 30

[a05] 5. What is the maximum allowable ground slope for the radar equipment shelter?

Back 30

A maximum of 4 percent of ground slope

Front 31

[a05] 6. Explain why the distance between the radar antenna pallet and the equipment shelter is limited.

Back 31

Because the lengths of waveguide available and the bend limits of the flex waveguide limit the distance

Front 32

[a05] 7. State the purpose of truck stablizers.

Back 32

To eliminate the effects of the truck suspension as the antenna rotates.

Front 33

[a06] 1. By what means does the radar derive target height?

Back 33

Through the use of a stacked beam antenna and multiple receivers.

Front 34

[a06] 2. List the signals generated by the frequency generator.

Back 34

The phase coded 6.8 usec TS PULSE, the 32 MHz COHO, STALO,and the IF and RF TEST TARGETS.

Front 35

[a06] 3. Describe the output of the transmitter

Back 35

A phase coded 6.8usec pulse from the frequency generator amplified to approximately 3MW.

Front 36

[a06] 4. Why does the transmitter require liquid cooling?

Back 36

Due to the excessive heat buildup in generating the high power pulse.

Front 37

[a06] 5. Identify the type of antenna the radar set uses.

Back 37

A slotted waveguide, stacked-beam antenna

Front 38

[a06] 6. What unit generates and processes the JATS data?

Back 38

Signal Processor

Front 39

[a06] 7. Which processor develops radar and IFF/SIF target range and azimuth plotting and radar and IFF/SIF target correlation?

Back 39

Post Processor

Front 40

8. What unit provides IF and RF test targets to balance and check out the equipment during testing?

Back 40

Frequency generator

Front 41

[a06] 9. What unit monitors the input line for overvoltage and undervoltage, correct frequency, and correct phase differences?

Back 41

The primary power protection unit.