Dielectric installed a broadband antenna and RF system to Educational Media Foundation (EMF)’s WJKL-FM in Puerto Rico. EMF worked closely with Dielectric on a broadband antenna design to support both WJKL on 105.7 FM and a planned second station (104.7 FM). The center-fed DCR-M accommodates both frequencies (with 1 MHz separation) through a special reduced bay-spacing design that eliminates the need for future field tuning.
Side-mounted to a mountaintop tower with a center of radiation at 118 feet AGL (1,787 feet above sea level), the DCR-M was specified to withstand the often stormy weather elements of Puerto Rico, which are amplified during hurricane season. The project was delayed due to several harsh storms including Hurricane Maria in 2017. The project was revived once power was returned to the remote site and the general infrastructure was restored.
“Dielectric’s robust antenna design meets the weight and wind-load specifications of our tower while building in the appropriate protections for continued operation in our harshest weather conditions,” said Kim Allison, director of site development, EMF/WJKL-FM. “This was of high importance considering the remote tower location.”
Dielectric worked closely with Sabre to develop a custom mounting system that could support the unique bay-spacing design. This included a standoff pole for the tapered tower architecture, and a bracket design that eliminated complex anti-rotation elements for the antenna bays. Dielectric also added its “funky elbow” design to reduce ground radiation from the DCR-M, through a robust inter-bay feed system that optimizes signal coverage without directing radiation downward from the tower.
Dielectric Vice President and General Manager Keith Pelletier notes that Dielectric worked closely with EMF, Sabre, and local contractors in Puerto Rico to ensure that timelines were met and logistics were well-coordinated. Everything was shipped in a single container to reduce costs, with Sabre designing the stand-off pole in short, modular sections to fit cleanly alongside Dielectric’s antenna.
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