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  1. Dear group, before contacting the right authorities at the armybase in Leesville, I thought let's ask on this forum first. For an upcoming documentary I will be doing sound. Filming will take place at Fort Polk in Leesville, Louisiana. I have never filmed at an army-base before let alone a US army-base (don't know if this is any different from other armybases). What kind of wireless-trouble could I get myself into, frequency-wise? Do I have to expect range-drops/losing reception caused by strong interference from army-transmissions? Anyone who filmed on that location before who could chime in? it would be very much appreciated. As I said, I will contact the supervising authorities who permitted us to film to ask about this, but any expert-info from the board would be of great help. My wireless kit is 4 x Audio-ltd 2040 in the 630 - 654 mHz band. Thanks so much, Diego
  2. I have been reading recently in TV Technology some articles or letters from people who are experiencing EMI interference from the new LED light bulbs that are starting to appear at Home Depot and other Hardware stores and lightning supply stores. These bulbs they tested emitted enough radiation out of the Bulb and associated wiring to knock ATSC channel 10 off the air in the vicinity of several hundred feet.. Frequencies in the 400 to 600 Mhz range were found to be emitted from the switching power supply contained in these bulbs. Has anyone noticed this interference reducing Wireless Mic sensitivity in production situations where we are seeing more and more LED fixtures showing up? Larry Fisher. Have you done any testing with spectrum analyzer to see if this will be an increasing problem in the future with more and more of these "dimmable" LED lamps being used in buildings or on sets? I just noticed all the streetlights in my neighborhood have been replaced with LED based lamps. Will this add to the noise floor of the VHF spectrum? Apparently Part 15 FCC approval is really not policed and is really granted without testing on the honor system.
  3. Hi Folks, At last months AES, Henry Cohen chaired a seminar entitled, "TVBDs and Geo-Location Databases: An In-Depth Look and Their Impact on Wireless Microphone Usage" with an all star group of panelists. Here's the write up from AES' website: Panelists : Jesse Caulfield, Key Bridge Global Joe Ciaudelli, Sennheiser USA Ira Keltz, Federal Communications Commission Michael Marcus, Marcus Spectrum Solutions Steve Mendelsohn, ABC NY Jets David Pawlik, Skadden Arps Edgar Reihl, Shure, Inc. James Stoffo, independent entertainment production RF coordinator Television band devices (TVBD) are a reality and the first of the geo-location databases directing TVBD operations are in the testing phase. Operating wireless microphones, IEMs, intercoms and cueing in this new environment requires understanding how the databases work and the rules governing both licensed and unlicensed wireless production equipment. This panel brings together a diverse group of individuals intimately involved from the beginning with TVBDs, databases and the new FCC rules as well as seasoned veterans of medium to large scale wireless microphone deployments to discuss how the databases operate, how to use the database for registering TV channel usage, and best procedures and practices to insure minimal problems. Because this topic will define the future of wireless mics for the foreseeable future, we asked Henry if we could video tape the seminar. Here are the links: Part 1: http://vimeo.com/32188941 Part 2: http://vimeo.com/32197887 Please note that due to union regulations at the Javits, we were limited to a single camera "anthropological" record of the event, and no audio feed - I had to post-sync the mp3 recording of the seminar to the video! But, there is an amazing amount of information and opinions expressed at the seminar. We are in the middle of writing an in-depth article on the new TVBDs and their effect on wireless mics which will appear in next month's Gazette, but in the mean time this video has a lot of information. One thing is clear: If you are eligible for a Part 74 FCC licence, GET IT! Peter Schneider Gotham Sound
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