TM 11-5840-281-12-1
1-14.
SYSTEM PRINCIPLES OF OPERATION. (CONT)
When the height finder function is used, the operator can determine the altitude of an aircraft (off the approach end of the
active runway) that is within the scan and servo limits of the elevation antenna (O to 35 degrees in elevation and 30
degrees in azimuth).
When the precision approach or final approach function is used, the operator can guide the aircraft along the proper
glidepath and courseline to within 20 feet of the touchdown point. Azimuth and elevation information is continuously
displayed on the crt display using a beta scan presentation. The display also provides the operator with range
information, so that the exact position of the aircraft can be determined at any instant during the final approach.
1.15.
COMPONENT PRINCIPLES OF OPERATION.
RECEIVER-TRANSMITTER
The receiver-transmitter generates and receives the rf signals used in the operation of the radar set. The transmitter
section generates pulsed rf energy that is routed to the rf section. The rf section emits this pulsed rf energy from the
azimuth and elevation antennas. The return signal from a target is then picked up by the antennas and routed through
the rf section to the receiver section. The receiver section then processes and amplifies the signal into a radar video.
The radar video is then routed from the receiver section to the control-indicator, where It is displayed on the crt. The
time between pulses of the transmitter allows the rf energy transmitted during one pulse to reach the target and return
before the next pulse is transmitted.
1-17
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