BE_RadioCombinerGuide - FM HD Radio Combiner Guide FM HD...

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show in which hopeful contestants must choose one of the doors. Behind door number one is common amplification (also known as low-level combined), a proven implementation plan for lower powered stations but not a practical option for high-powered FMs. Behind door number two is separate antennas, which will fit the bill for some Class B and Class C stations but only if they have antenna infrastructure to spare. This methodology may include an entirely separate antenna, interleaved bays, or antennas that are dual fed. Behind door number three is high-level combining, a prevalent option for powerhouses that lack the wherewithal for a separate HD Radio antenna. There’s also door number four, a back door ap- proach to high-level combining known as mid-level combining. This is yet another possibility for a few Class B or C stations that have late-model transmitters not able to high-level combine HD Radio and FM. So, contestant, which one of these doors is the right one for your station(s)? Determining how and where to introduce HD Radio in the transmis- sion chain is an important first step. There’s simply no way around it: You will have to crack open one of these doors in order to take part in all the new opportunities opening up as a result of HD Radio. The key is to choose the most cost-effective, operationally-efficient system that will give you a reliable foothold on HD Radio now, plus unlock all that the future has to offer, such as Tomorrow Radio SM and text data functions. We suggest you start with the basic considerations: 1. operating power 2. availability of tower and transmitter space 3. cooling capacity 4. desired redundancy 5. implementation cost 6. operating costs 7. existing equipment compatibility with HD Radio 8. system complexity 9. whether to upgrade a single station or a cluster of stations It doesn’t hurt to add flexibility into the equation: 10. readiness for Secondary Program Services (Tomorrow Radio) 11. readiness for HD Radio text; Ethernet connectivity from the studio Then, review what you know about combiner methods . .. and bone up on what you might not know about those methods. What follows is a closer look at what’s behind each door. FM HD Radio Combiner Guide New transmitter w/headroom High Level Combine Analog transmitter with 10% power headroom? NO Separate Antenna Dual transmitter (split) YES NO Antenna for HD? YES >14 kW Analog FM TPO? Common Amplification (Low-level combine) <14 kW FM HD Radio Implementation Decision Tree Go to and click on “HD Radio Power Calculator” to determine power requirements Broadcast Electronics, Inc. • 4100 North 24th Street, P.O. Box 3606, Quincy, Illinois 62305-3606 U.S.A. Telephone: (217) 224-9600 • Fax: (217) 224-9607 • E-Mail: [email protected] •
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This note was uploaded on 01/31/2012 for the course EE 4002 taught by Professor Scalzo during the Fall '06 term at LSU.

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BE_RadioCombinerGuide - FM HD Radio Combiner Guide FM HD...

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