OPERATIONAL EVALUATION OF EDM VHF JAMMER USED AGAINST DRONE RP-71 AND MARKER BEACON RECEIVER AN/ARN-12

The final operational-evaluation test results are presented for the EDL VHF Jammer employed as a countermeasure against two airborne devices, the RP-71 Drone and the Market Beacon Receiver ANARN-12. The tests demonstrated that the jammer is successful against the drone but less effective against the beacon receiver. The jammer is a 100-watt AMFM transmitter in the range of 20 to 70 mc combined with an R-220 receiver and is mounted in a 14-ton truck. The transmitter covers a major part of the frequency range of the drone, 53 to 74 mc, and was field modified to match the frequency of the beacon receiver, 75 mc. he jammr obtains a range of 13 mi against the drone when the drone is only 1 mi from its ground-based control, a range that will increase as the drone, to be tactically useful, flies at greater distances from its control. Line-of-sight is necessary to jam the drone or intercept the signals of its control. The effective range of the jammer against the beacon receiver varies with altitude, but is less than 4 mi when the receiver is 2,500 ft in altitude. Author