Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
41 Cards in this Set
- Front
- Back
(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.
|