Production Sound & Video

Spring 2021

Issue link: http://digital.copcomm.com/i/1351135

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and manufacturers came together to address the issues. These discussions were initiated by the manufacturers of DMX lighting control devices, and all affected crafts and manufacturers were invited to participate, including Local 728, Local 600, and the Technical Trends Committee of Local 695. Various solutions were discussed and models of "coordinated behavior" were identifi ed, primarily by drawing on the practical experiences of our counterparts in the world of theater. With so many theaters nestled so close together on Broadway, the stage industry had overcome the challenge of running fi fty channels of wireless microphones, several channels of production communication, DMX control, and Wi-Fi, all without stepping on one another's toes. The concept of "coordinated behavior" contains the practice of frequency coordination, along with the practice of using all transmitters at their lowest acceptable power level. As the 2.4 GHZ and 5 GHz bands are open to any properly manufactured Intentional Radiator, the committee could only recommend 'best practices.' Shortly thereafter, a practical solution was achieved by the manufacturers— the companies making wireless video for the camera departments would only operate in the 5 GHz band, and the DMX devices would be only in the 2.4 GHz band. In terms of coordination, a simple phone call in pre-production between those crafts using the unregulated portions of the radio spectrum can effectively reduce the risk of interference between them. Along with identifi cation of frequency groups used, if participants agree to transmit at the lowest acceptable ERP (radio energy transmitted from the antenna), multiple departments can and do share the Wi-Fi bands. It is also paramount to note that these unlicensed Intentional Radiators are not allowed to cause interference to any licensed operation such was wireless microphones in the UHF (Ultra-High Frequency) band. The FCC recently released a new online process for obtaining the Part 74 license, called Form 601 in the FCC's Universal Licensing System (ULS). It is cross-platform and should run on any modern HTML 5 browser. Thanks to Bill Ruck in San Francisco and our own Laurence Abrams and Tim Holly, Local 695 is again sponsoring completely rewritten Step-by- Step Application Guide with detailed instructions from start to fi nish. If you have to obtain a license, please let us know your experience using the guide so we may improve it in future editions and make it as easy as possible to use. In order to contribute to our database of entertainment professionals holding their FCC Part 74 licenses, please let us know if you hold a license. Send contact info and license number to fcclicense@local695.com

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