Unit 6-6
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- (a40) The triggers transmitted from the radar data transfer group in the an/tpn-24 are used to synchronize
- the display function each PRF period
- (a40) The interrogator set is synchronized to the an/tpn-24 ASR to
- enable display of real-time bracket video coincident with the ASR video
- (a40) The staggered PRF periods in the an/tpn-24 are broken down into frames, what is the total period of each frame?
- 3810 us
- (a40) Frame sync pulses are produced in the an/tpn-24 every
- 4th PRF period
- (a41) Which unit in the an/tpn-24 is used to control triggering of the ASR shelter display?
- Azimuth Converter 2A12A3
- (a41) Which unit within the an/tpn-24 is used to keep the display synchronized with the antenna?
- Azimuth encoder 2A38A4
- (a42) Which circuits within the xmitter of the an/tpn-24 are used to convert input power to a regulated 8.0kV?
- preregulator and high voltage power supply
- (a42) Which circuits within the an/tpn-24 xmitter are used to provide switching of the mode of operation?
- transmitter monitor and control
- (a43) In the an/tpn-24 xmitter preregulator and HVPS, what resonant frequency is selected to provide optimum purity of the output sine waves?
- 1.35 times the main operating frequency of 10kHz
- (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
- 175 degrees out of phase
- (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?
- synchronizer-video processor
- (a44) In the an/tpn-24 xmitter, what is the duration and amplitude of the pulse applied to the magnetron cathode?
- 1 usec., -27kV
- (a45) What is the frequency range at which the an/tpn-24 magnetron oscillates?
- 2.7-2.9 GHz
- (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?
- Radar Set Control
- (a46) In the an/tpn-24, how long is current reduced to the magnetron filament when the xmitter is initially turned on?
- 30 seconds
- (a47) Which horn is used to produce the main low-angle beam in the an/tpn-24, and where is it located?
- 1, positioned at the top of the vertical array
- (a48) What type of polarization is produced when the an/tpn-24 antenna polarizer rotor is moved to its second position?
- circular
- (a49) When beam switching in the an/tpn-24 is selected, ground clutter is eliminated
- in the quadrants selected and out to the range selected
- (a50) What is the normal frequency difference between the two xmitters in the an/tpn-24 that permit proper operation of the diplexer?
- 93 MHz
- (a51) What portion of the an/tpn-24 antenna is not stored within the shelter for transport?
- beacon antenna
- (a52) what normal receiver mode in the an/tpn-24 provides a CFAR?
- wideband limiting mode
- (a53) The coherent oscillator in the an/tpn-24 is turned at what time?
- simutaneously with the arrival of the gated AFC IF signal
- (a53) Which receiver in the an/tpn-19 derives its reference signal from the clutter itself?
- noncoherent
- (a54) Which two videos are combined in the synchronizer video processor of the an/tpn-24 to provide the benefit of dual diversity operation?
- normal and normal
- (a54) Why is the normal A video blanked, in the an/tpn-24 video processor, at the beginning of each PRF?
- B channel transmit time
- (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?
- Noncoherent MTI video
- (a55) How many xmitters are required to transfer the large volume of data from the ASR to the operations shelter?
- two (2)
- (a55) Which circuit in the microwave radio receiver mixes the local oscillator signal with the RF input to produce the IF signal?
- RF to baseband circuits