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28 Cards in this Set
- Front
- Back
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(a40) The triggers transmitted from the radar data transfer group in the an/tpn-24 are used to synchronize
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the display function each PRF period
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(a40) The interrogator set is synchronized to the an/tpn-24 ASR to
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enable display of real-time bracket video coincident with the ASR video
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(a40) The staggered PRF periods in the an/tpn-24 are broken down into frames, what is the total period of each frame?
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3810 us
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(a40) Frame sync pulses are produced in the an/tpn-24 every
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4th PRF period
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(a41) Which unit in the an/tpn-24 is used to control triggering of the ASR shelter display?
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Azimuth Converter 2A12A3
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(a41) Which unit within the an/tpn-24 is used to keep the display synchronized with the antenna?
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Azimuth encoder 2A38A4
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(a42) Which circuits within the xmitter of the an/tpn-24 are used to convert input power to a regulated 8.0kV?
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preregulator and high voltage power supply
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(a42) Which circuits within the an/tpn-24 xmitter are used to provide switching of the mode of operation?
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transmitter monitor and control
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(a43) In the an/tpn-24 xmitter preregulator and HVPS, what resonant frequency is selected to provide optimum purity of the output sine waves?
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1.35 times the main operating frequency of 10kHz
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(a43) The answer that best describes the input to the 8kV HVPS in the an/tpn-24 is produced when the input sign waves are
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175 degrees out of phase
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(a44) The trigger used to fire the thyratron switch in the modulator and post regulator circuit in the an/tpn-24 originates in what circuit?
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synchronizer-video processor
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(a44) In the an/tpn-24 xmitter, what is the duration and amplitude of the pulse applied to the magnetron cathode?
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1 usec., -27kV
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(a45) What is the frequency range at which the an/tpn-24 magnetron oscillates?
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2.7-2.9 GHz
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(a46) In the an/tpn-24, where is mode control accomplished when the CONTROL switch on the xmitter control-monitor panel is placed in the operate position?
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Radar Set Control
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(a46) In the an/tpn-24, how long is current reduced to the magnetron filament when the xmitter is initially turned on?
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30 seconds
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(a47) Which horn is used to produce the main low-angle beam in the an/tpn-24, and where is it located?
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1, positioned at the top of the vertical array
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(a48) What type of polarization is produced when the an/tpn-24 antenna polarizer rotor is moved to its second position?
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circular
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(a49) When beam switching in the an/tpn-24 is selected, ground clutter is eliminated
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in the quadrants selected and out to the range selected
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(a50) What is the normal frequency difference between the two xmitters in the an/tpn-24 that permit proper operation of the diplexer?
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93 MHz
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(a51) What portion of the an/tpn-24 antenna is not stored within the shelter for transport?
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beacon antenna
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(a52) what normal receiver mode in the an/tpn-24 provides a CFAR?
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wideband limiting mode
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(a53) The coherent oscillator in the an/tpn-24 is turned at what time?
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simutaneously with the arrival of the gated AFC IF signal
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(a53) Which receiver in the an/tpn-19 derives its reference signal from the clutter itself?
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noncoherent
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(a54) Which two videos are combined in the synchronizer video processor of the an/tpn-24 to provide the benefit of dual diversity operation?
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normal and normal
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(a54) Why is the normal A video blanked, in the an/tpn-24 video processor, at the beginning of each PRF?
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B channel transmit time
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(a54) In the an/tpn-24 video processor, what video is used instead of normal video when a block of clutter is detected by the clutter gate?
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Noncoherent MTI video
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(a55) How many xmitters are required to transfer the large volume of data from the ASR to the operations shelter?
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two (2)
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(a55) Which circuit in the microwave radio receiver mixes the local oscillator signal with the RF input to produce the IF signal?
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RF to baseband circuits
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