Unit 6-2
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- (a04) The an/tps-75 radar set provides information on aircraft for a radius of
- 240 nautical miles
- (ao5) the maximum degree of ground slope for the radar antenna pallet and equipment shelter is
- 6 degrees
- (a05) This north mark alignment insures that your antenna is oriented to within
- +- 1 degree of north
- (a06) What is the relationship of the STALO frequency to the xmit frequency in the an/tps-75 radar?
- the STALO is 32 MHz below the xmitted frequency
- (a06) The range and azimuth correlation of IFF and radar returns is accomplished in the
- post processor
- (a06) HOw many modes of communication are provided to the operator in the an/tps-75 radar by the communications system?
- 5
- (a07) The radar initialization function in the an/tps-75 is performed...
- automatically at the system power-up
- (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
- six system microprocessors
- (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?
- 32 MHz
- (a08) What are the PRT modes for the an/tps-75 radar?
- fixed, staggered, or burst
- (a08) In the an/tps-75 radar, a JATS jump signal is generated every
- 405 degrees of antenna rotation
- (a09) The STALO RF output from the an/tps-75 frequency generator is sent to the RF receivers for...
- RF to IF downconversion
- (a09) What type of amplifier is used in the an/tps-75 xmitters driver circuit?
- pulsed TWT amplifier
- (a10) What an/tps-75 circuit ensures the PFN output pulse has the same potential from PRT to PRT?
- PFN shunt regulator
- (a10) What two circuits generate the high voltage enabling pulse for the an/tps-75 FPA?
- trigger amplifier and PFN
- (a11) One purpose for the an/tps-75 radiate control interlock network is to...
- ensure a definite turn-on sequence for the transmitter
- (a11) How many faults are required to lock out the automatic reset circuit of the an/tps-75 radiate control interlock network?
- 4
- (a12) The an/tps-75 waveguide is pressurized and dehydrated to...
- keep out moisture and prevent arcing
- (a12) What is the pressure range in the an/tps-75 waveguide?
- 24-27 psi
- (a12) What is used to dehydrate the an/tps-75 waveguide air?
- a desiccant canister
- (a13) What type of antenna is used to recieve the side lobe reference signal in the an/tps-75?
- Omnidirectional
- [A04] 1. What is the only required input to the radar?
- 400hz primary power
- [a04] 2. With what does the radar set interface?
- AN/TYQ-23 operations module
- [a04] 3. In the transit configuration, what does the shelter package contain?
- All of the electronic equipment including the heat exchanger, two air conditioners, and the IFF/SIF antenna
- [a05] 1. Define radar screening.
- The blocking of all or a portion of the radar beam by an obstacle.
- [a05] 2. Give 2 reasons for clearing a zone around radar and communications antennas.
-
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 - [a05] 3. What item is required before a site survey is started for a CRC or CRE?
- A radar coverage diagram.
- [a05] 4. What is the major reason radar antennas are placed at the highest elevation?
- To prevent interference with the radiation pattern.
- [a05] 5. What is the maximum allowable ground slope for the radar equipment shelter?
- A maximum of 4 percent of ground slope
- [a05] 6. Explain why the distance between the radar antenna pallet and the equipment shelter is limited.
- Because the lengths of waveguide available and the bend limits of the flex waveguide limit the distance
- [a05] 7. State the purpose of truck stablizers.
- To eliminate the effects of the truck suspension as the antenna rotates.
- [a06] 1. By what means does the radar derive target height?
- Through the use of a stacked beam antenna and multiple receivers.
- [a06] 2. List the signals generated by the frequency generator.
- The phase coded 6.8 usec TS PULSE, the 32 MHz COHO, STALO,and the IF and RF TEST TARGETS.
- [a06] 3. Describe the output of the transmitter
- A phase coded 6.8usec pulse from the frequency generator amplified to approximately 3MW.
- [a06] 4. Why does the transmitter require liquid cooling?
- Due to the excessive heat buildup in generating the high power pulse.
- [a06] 5. Identify the type of antenna the radar set uses.
- A slotted waveguide, stacked-beam antenna
- [a06] 6. What unit generates and processes the JATS data?
- Signal Processor
- [a06] 7. Which processor develops radar and IFF/SIF target range and azimuth plotting and radar and IFF/SIF target correlation?
- Post Processor
- 8. What unit provides IF and RF test targets to balance and check out the equipment during testing?
- Frequency generator
- [a06] 9. What unit monitors the input line for overvoltage and undervoltage, correct frequency, and correct phase differences?
- The primary power protection unit.