The EAN113-3 monitor antenna is for communicating over short, medium and long range distances in the 2-30 MHz frequency range. Corrosion resistant materials are utilized throughout the antenna system, making long life possible in any climate.
The EAN113-3 is a multisectored circular array consisting of sixteen log periodic curtain antennas. Eight of the curtain antennas are horizontally polarized, the remaining eight are vertically polarized. The horizontal curtains are modified versions of the LPH-0406 log periodic antennas. Each prefabricated curtain consists of 21 dipoles supported by droppers from 2 horizontal catenaries. The modification process reduces the lower frequency coverage from 3 MHz down to 2 MHz by the addition of a termination assembly. Below three MHz, the gain rolls off and the radiation patterns broaden. Above 3 MHz the antenna is full sized, naturally resonant, efficient, and provides near constant radiation characteristics with frequency. The vertical curtains are modified versions of the LMV-0207 log monopole antennas. Each curtain consists of 11 triangular shaped radiating elements. The modification reduces the lower frequency from 3.5 MHz down to 2 MHz by the addition of a termination assembly. Below 3.5 MHz the gain begins to roll off and radiation patterns broaden. Above 3.5 MHz the antenna is full sized, naturally resonant, efficient, and provides near constant radiation characteristics with frequency.