EXPERIMENTAL INVESTIGATION OF CHAFF TRANSMISSION IN THE 1300 TO 1800 MC FREQUENCY RANGE
Abstract
Efforts are being made to determine the feasibility of communicating between 2 ground points via chaff clouds employing the presently available AN/GRC-50 radio relay equipment of modest power (10 watts) operating in the 1300 to 1800 mc frequency range. Experimental efforts were divided into 2 phases. Phase I utilizes an aircraft to dispense chaff for transmitter-receiver separation of 4 to 6 miles. Phase II will use rockets to dispense chaff at an altitude of 200,000 ft and equipment separation from 100 to 150 miles. Progress is reported on the preliminary design of Phase I experiment and on the erection, checkout, and calibration of the M-33C radar and AN/GRC-50 radio equipment. Also, a single chaff drop was made and the chaff cloud tracked by the radar and illuminated intermittently by the AN/GRC-50 transmitting station. The measured value of minimum detectable signal for the AN/GRC-50 receiver was -140 dbw ! 3 db. The computed value for the average S/N expected at the receiver (for a 6-mile separation between transmitter and receiver and for 10 pounds of chaff dispensed over one terminal at 12,000 ft was 26 db. Measured fall rates varied from 30 to 250 ft per minute with an average of 125 ft per minute. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 1961
- Accession Number
- AD0268756
Entities
People
- L.h. Bauer