Radio Frequency Coordination For Events AES PNW Section

Radio Frequency Coordination For Events AES PNW Section, Seattle WA April 2016

James Stoffo

UHF Spectrum 2000 -2020

Full power TV Distant / low field strength TV signal: cochannel operation possible Exclusive mic channels Shared white space channel Now Ch 14 Ch 37 Ch 51 Downlink Naturally occurring White Space channel. Higher activity as more TVWS devices enter the market Guard band: unlicensed operation of unlicensed TVWS & mics Duplex Gap for licensed mic use. High noise floor possible Uplink Duplex Gap for unlicensed TVWS Possible strategies in the UHF band as we know it… 6 | Future? UHF TV band 470 -698 MHz

We won’t know until the auction is over and FCC issues complete results. ► ■ 3 year transition period. Keep searching for news stories: “FCC auction wireless microphones white space” etc.

Part 74 Licensing The Part 74 License will allow Licensed operation of wireless mics, wireless in ear monitors, and wireless communications in the following Users whobands. routinely work with 50 or more Frequenices Transmission Power 54 MHz - 72 MHz 50 m. W 76 MHz - 88 MHz 50 m. W 174 MHz - 216 MHz 50 m. W 470 MHZ - 698 MHz 250 m. W frequencies are eligible to apply for and be protected under the FCC’s Low Power Broadcast Auxiliary (LPBA) Part 74 License providing immediate access to the white space database and offering the right to reserve necessary frequencies for a production or event.

Geo-location Database shows which TV channels are reserved for wireless mics and comms Registering event protects you from interference on non-reserved channels Licensed users get immediate access Unlicensed users need FCC approval first 30 -day advance notice required Expect them to be very selective

Geo-location Databases Currently active databases: http: //keybridgeglobal. com http: //whitespaces. spectrumbridge. com/whitespaces/home. aspx https: //prism. telcordia. com/tvws/home/contour_vis. shtml https: //www. google. com/get/spectrumdatabase/ Professional Wireless Systems License Assistance www. part 74. com

Spectrumbridge results for reserved mic channels in 98109

http: //www. winradio. com/home/g 33 wsm. htm

Intermodulation Analysis System

RF Explorer http: //rfexplorer. com

Clear Waves Software http: //rfexplorer. com/white-space-finder/

Frequency Coordination

Intermodulation Distortion (IMD)

Metal Trays Reduce IMD

RF Level Comparison, In. Trays and Out

IAS Demo

IAS Frequency Coordination Report

Get Creative Test Your Assumptions Keep Records, Track Changes Watch This Space