Dielectric Introduces HD Plus� Digital FM AntennaNovember 29, 2022
by -- DielectricDielectric Communications is pleased to announce the introduction of the HD Plus FM antenna, which achieves a level of analog and digital signal isolation necessary for in-band on-channel (IBOC) broadcasts without the isolator required by the majority of separate antenna systems recently approved by the FCC for high definition radio operation.
The HD Plus� antenna can easily be integrated alongside existing analog FM antennas, allowing the station the ability to continue its analog broadcast while also adding a digital broadcast of the same signal at the same frequency. IBOC broadcasts are transparent to radio audiences using analog receivers, while those with digital receivers benefit from improved audio quality.
With the HD Plus�, special design considerations between the analog and digital antenna bays provide for isolation that exceeds 40 dB, over 10% more than the 36 dB required by the FCC. With such excellent isolation from the antenna, the need for a supplemental isolator in the system is effectively removed. This not only lowers the initial equipment expenditure, but removes a component which has until now proven to be a reliability concern.
�The HD Plus� antenna represents the latest innovation resulting from Dielectric's continual efforts to develop reliable, cost-effective solutions for broadcasters,� said John Chapman, VP and General Manager of Dielectric�s Broadcast Platform products. �It provides an efficient means of implementing high definition radio using an existing analog antenna.�
Infinity Broadcasting in Chicago is broadcasting with a Dielectric HDR antenna. In this case, the broadcaster had both limited tower space to install an antenna and very limited room in which to house the combiner system. To accommodate the customer�s unique requirements, Dielectric designed two station branch combiners that required less than half of the floor space of a four-station constant impedance combiner. Using the two separate combiners, one pair of stations is fed to a DCR-M antenna and the second pair of stations is fed to an HDR-M antenna. Given the inherent isolation between the two antennas they are interleaved, and share the same tower aperture. This creative solution proved to be not only a very good technical solution to the limited space available, but was also a very cost effective answer to a difficult challenge.
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