OPERATIONAL EVALUATION OF EDL TYPE 1 EXPENDABLE JAMMER AGAINST THE MARKER BEACON RECEIVER AN/ARN-12
Abstract
An evaluation of the EDL type I expendable jammer as a countermeasures device for use against airborne marker beacon receiver AN/ARN 12 is presented. The jammer is the first breadboard model of a compact 75-mc/s trans mitter capable of a power output of 5 to 9 watts, depending upon the battery voltage supplied. The antenna supplied with the equipment is a one-turn helix designed to produce a field intensity pattern the same as that of a marker beacon. A bench test demon strated the frequency stability of the jammer, and the AN/< WAS FIELD-TESTED TO DETERMINE ITS RECEPTIVITY TO THE JAMMER AND TO THREE MARKER BEACONS, THE CAA-TZH, the Wilcox model 492, and the AN/MRN-3A. Thereafter the EDL Type I expendable jammer was employed to attempt deception of a pilot using the AN/ARN-12 as he approached each of the marker beacons under varying circumstances of flight. The tests showed that the jammer was successful when the aircraft flew at altitudes of 2,000 feet or less, but that it would require greater power output to affect the AN/ARN-12 above that altitude. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1957
- Accession Number
- AD0340924