Unit 5-4

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(816) What type of multiplexing is used in the closure, analog, digital, and video/trigger/data channels?: Time division multiplexing
(817) The most common type of modulation used in remoting is...: Amplitude modulation (AM)
(818) Which converter is used in both the precision approach radar (PAR) shelter and radar approach control (RAPCON) remoting equipment to convert the parallel 32-bit data words to serial data and back again?: Digital-to-digital (D/D)
(818) In the AN/GPN-22 precision approach radar remoting system, which channel is not remoted to the radar unit?: Video/Triggers/Data
(819) Where are the modulated subcarriers that represent the various types of inputs to the remoting circuits summed?: Remoting common channel
(819) In the remoting section of the precision approach radar, what are the four stages of the line receiver?: High voltage protection and balance adjust circuits, equalizer circuits, output amplifier and gain adjust circuit, and output buffer.
(820) The precision approach radar (PAR) indicator system indicates an aircraft's...: elevation, range and azimuth
(820) Azimuth and elevation cursors are curved on the precision approach radar (PAR) indicator to...: compensate for PAR offset from runway.
(820) Where is the reference reflector displayed on the precision approach radar (PAR)indicator system?: Azimuth portion only
(821) The main function of the refresh memory in the precision approach radar (PAR) indicator system is to...: maintain a flicker-free presentation for the display.
(821) In the precision approach radar (PAR) indicator the top and bottom half of the display respectively presents elevation and azimuth data versus...: range data
(822) With the exception of the signal generator mode, what position should the trigger switch be left in on the AN/UPM-145 Radar Test Set?: RF.
(822) The AN/UPM-145 output frequency can be adjusted between...: 8.4 to 10.0 GHz.
(822) On the front panel of the AN/UPM-145 the potentiometer indentified as FINE, in the attenuation section, provides continuous attenuation adjustment of the test set radio frequency (RF) output signal level from...: +7dB to -15dB.
[816] What are the three basic methods of multiplexing?: (1) Frequency division.
(2) Time division.
(3) Phase division.
[816] Define multiplexing as related to computer operation.: Multiplexing is the process of transferring data trom several storage devices that operate at relatively low transfer rates to one storage device that operates at a high transfer rate so the high-speed device is not obliged to wait for the low-speed devices.
[816] Describe the types of multiplexing used in PAR remoting.: Frequency and time-division multiplexing combine more than one signal on one line buy assigning different frequencies and by allotting specific time intervals, respectively.
[817] In AM modulation, what varies the carrier amplitude?: The frequency and intensity of the modulating signal intelligence.
[817] In a 3-tone FSK message containing binary digital information, what does the frequency of 12kHz represent?: A sync pulse that indicates the start of a new message.
[817] What two types of modulation does the analog data undergo?: (1) PCM (Pulse code modulation)
(2) AM (Amplitude modulation)
[818] In the AN/GPN-22, what type of mutiplexing is used on all the signals being remoted?: Frequency-division multiplexing.
[818] Why use a D/D converter?: To serialize the parallel data for efficient frequency-division multiplexing, and to retun the computer data to parallel form.
[818] What are the five channels used for remoting? Why not use more or less then five channels to remote information?: The 5 channels are Voice, closure, analog, digital, and video/data/trigger.
The fewer channels the better, although, the five channels are natural groupings of similar data, so less than five channels would not be advantageous.
[818] What channel is not multiplexed?: The voice channel
[819] Above what frequency are the video frequencies attenuated?: 4MHz
[819] What frequency is the microwave carrier, and what signal modulates it?: 8GHz or 15GHz.
The composite signal.
[819] If the cable remoting distance is changed, how can the new frequency compensation requirements be met?: Strap the line driver and receiver to the nearest 1,000 feet, and use the +/- 500-foot adjustable circuit in the receiver for any further requirement.
[820] Why are the cursors curved?: Because of the offset between the PAR and actual touchdown.
[820] How is decision height shown on the display?: A cursor intersecting the elevation cursor at decision height.
[820] What is signified by the distance between the designate symbol home position and the first range mark?: Distance to touchdown data.
[820] What does the reflector symbol represent, and where is it shown on the display?: An azimuth reference; on the azimuth half of the display.
[821] What component acts as the buffer between the TDC and display indicator?: The refresh memory
[821] What signal initiates each sweep, and how often?: The MPX (MultiPleX) trigger; it occurs at the beginning of every PRF (Pulse Repetition Frequency) period.
[821] How does the display indicator know where to paint the designate symbol?: The ball tracker provides X and Y position data.
[821] Describe how to "acquire" a target.: With the ball tracker, place the designate symbol over the target and press the ACQUISITION button. X and Y data from this is sent to the TDC (Target Data Computer), which then searches for the target.
[822] What is the maximum input to the AN/UPM-145 with a pulsed radar system?: 50+ dBm
[822] What is the purpose of the PRF potentiometer?: It provides for continuous control of internal test set trigger pulse repetition rate from 50 to 5,500 PPS (Pulses Per Second).
[822] What is the purpose of the FM functional group?: To provide frequency modulation of the test output.
[822] On the AN/UPM-145 what is the purpose of the mode switch?: Provides for selection of test set mode of operation (radar, signal generation, or self-test mode).
[822] The frequency out of the test set can be adjusted between what values using the course and fine controls?: 8.4 to 10.0 GHz
[822] What are the available pulse widths out of the AN/UPM-145 Test Set?: 0.12 to 5.00 usec in 0.01 usec steps.

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Number of cards 41