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Overview of MaxxCasting by Geo-Broadcast
Solutions John Kean
Senior Technologist NPR Labs – National Public Radio
Feb. 5, 2013
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Background
Many are familiar with on-frequency repeaters (boosters) ◦ Most recall stories of unsatisfactory performance
Distorted audio (multipath)
Weak coverage
Interference to primary transmitter’s signal
◦ Some were problematic and were turned off
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MaxxCasting
An FM repeater system, but that is where similarity ends…
Brings some new technologies to repeater networks to resolve performance issues ◦ Research into parameters that determine multipath interference
◦ Advanced geographic tools to intelligently design repeater networks
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What is MaxxCasting?
Multiple lower-power, lower-height transmitters ◦ Placed strategically for desired zone
◦ Spaced optimally to provide coverage fill-in (major roadways, building penetration)
Frequency and modulation synchronized with primary transmitter using Harris Synchrocast®
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Harris Broadcast Synchrocast®
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NPR Labs’ Role
Design parameters ◦ RF Lab simulations of
primary transmitter and MaxxCast repeater signals Both mobile
(Rayleigh) fading and fixed signals
Process audio with professional broadcast hardware
Received with standard consumer car and home radios
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NPR Labs’ Role
Listener tests ◦ Measure consumers’
opinions of MaxxCast design parameters
◦ Conducted at Towson University, designed and supervised by Dr. Ellyn Sheffield
◦ Listener keep-on, mean opinion scores
◦ 19,000 data points
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Design Parameters
Listeners evaluated ◦ mono and stereo
modes
◦ Speech, music, voiceover
◦ Time-of-arrival between signals
◦ RF ratios between signals
◦ Compiled as tables, then surface charts
3
7
12
2004
816
Time (uS) D/U (dB)
Keep-On Scores - Primary Stereo - Booster Mono
90%-100%
80%-90%
70%-80%
60%-70%
50%-60%
40%-50%
30%-40%
20%-30%
10%-20%
0%-10%
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Advanced RF Design Tool
Terrain-sensitive analysis of field strength
High-resolution Shuttle Radar Topography – city block level
Able to consider signals from multiple MaxxCast transmitters (nodes)
Population counts with US 2010 Census data
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Current Coverage
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Escondido Coverage
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6-Node Maxxcast Network Added
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Escondido Coverage 6-Node MaxxCast
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KPRI(FM), Population Example
Indoor Service (65 dBu @ 2m)
Portable Service (74 dBu @ 2m)
Present Station 913.137 410,749
With Escondido MaxxCast
1,046,797 526,915
change 133,660 (+14%) 116,166 (+28%)
Notes: MaxxCast population counted after deduction for interference 2010 U.S. Census
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Interference Effects of 6-Node MaxxCast
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Interference Effects of 6-Node MaxxCast
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GBS MaxxCasting Why Do Stations Need MaxxCasting?
There are 94 million persons in the top 15 Arbitron metro markets
Those top 15 markets have radio revenue of $4.8 billion
Many of those markets full signal stations are not covering up to 15% of the markets’ potential listeners
Therefore, those stations are not reaching 14 million potential listeners
Therefore, those Stations are missing out on $.720 billion in potential revenue
How much of those potential revenues should belong to you?
INCREASE COVERAGE, LISTENERS, RATINGS AND REVENUE WITH MAXXCASTING