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The email blast from the head of my son and daughter's theater group relayed a frantic plea: "We need to raise $16,000 before the upcoming spring performances," Anya Wallach, the executive director of Random Farms Kids' Theater, in Westchester, New York, wrote in late May. If the money didn't materialize in time, she warned, there could be a serious problem with the shows: nobody would hear the actors.
Random Farms, and tens of thousands of other theater companies, schools, churches, broadcasters, and myriad other interests across the country, need to buy new wireless microphones. The majority of professional wireless audio gear in America is about to become obsolete, and illegal to operate. The story of how we got to this strange point involves politics, business, science, and, of course, money.
Story: https://www.wired.com/story/wireless-mics-radio-frequencies-fcc-saga/
(Score: 2) by All Your Lawn Are Belong To Us on Monday August 13 2018, @06:14PM (4 children)
Will they? You've researched that, then, and this new system won't bleed through harmonics into existing wireless mic systems?
This sig for rent.
(Score: 2) by RS3 on Monday August 13 2018, @06:52PM (3 children)
Hi again, I'm not sure of your experience with RF, HAM, etc., but these transmitters, by FCC rules, have quite clean RF output. I don't know the specs on RF sideband / harmonics, but it's very very low. I've had transmitters sitting next to each other on top of the receivers with the antennas 2" away and there is no kind of crosstalk or any perceptible interference, bleed, etc.- once the proper RF frequencies have been pre-selected so as to minimize the heterodyning. Again, additionally the receivers are extremely frequency-selective.
(Score: 2) by All Your Lawn Are Belong To Us on Monday August 13 2018, @10:05PM (2 children)
Again, I'm referring to the new spectrum owner's usage of the frequency. If they (the new owner's system) are transmitting right on top of your mic's frequency at a great enough power (with either the same modulation or a modulation that causes interference) your microphones will be useless. Unless you have specific data about who this new provider is, what they'll be transmitting, at what power levels and with what kind of transmission spread.
This sig for rent.
(Score: 2) by Alfred on Monday August 13 2018, @11:23PM
(Score: 2) by RS3 on Tuesday August 14 2018, @03:18AM
Oh, now I get what you're saying. You're saying if I continue to use an old wireless mic system which uses a frequency that is now allocated to someone else, that their transmitter will clobber my mic's transmitter's signal. Okay, I have no data, but my gut feel is: my mics, being within 0-100 feet (roughly 0 to 33 meters) of their receivers, will swamp whatever other transmitter there is due to the inverse-square law of received power versus distance. So yeah, if my mic pack uses 725 MHz, and an ambulance drives by using 725 (I have no idea who will be using it) my signal might get clobbered for a few seconds. Hopefully it was a singer hitting a bad note.
Again, if it's a fixed transmitter somewhere nearby that is swamping my signal, I can reprogram my frequency and likely avoid the interference.