EMF installs a customized antenna in San Juan

WJKL (FM) receives a dielectric DCR-M with special design aspects

On our page Who buys what? Dielectric reported on installing an antenna for the Educational Media Foundation in Puerto Rico and pointed out some unusual aspects.

EMF installed a broadband DCR-M antenna for non-commercial WJKL (FM) in San Juan to serve WJKL on 105.7 MHz and a second station on 104.7 FM in the future.

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“The centrally fed DCR-M supports both frequencies (with 1 MHz spacing) through a special design with reduced shaft spacing, which makes the need for future field coordination superfluous,” the manufacturer explained in an announcement.

“EMF has also added a new, purpose-built two-station branch combiner that serves both transmission frequencies and eliminates intermodulation problems caused by signal mixing in the transmitters.”

The antenna is mounted on the side of a mountaintop tower with a radiation center at 118 feet above the ground. The design was developed with storms, including hurricanes, in mind.

“The project was in fact delayed due to several violent storms, including Hurricane Maria in 2017, which caused widespread devastation on the island,” said Dielectric. “The project was revived after the remote site was powered up and general infrastructure restored.”

Dielectric worked with Saber to develop a custom mounting system that can support the antenna’s unusual antenna spacing design.

“This included a spacer for the tapered tower architecture and a bracket design that eliminated complex anti-rotation elements for the antenna bays,” it said. “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 down from the tower.”

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