cell phones
- Thread starter spong8
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Foxinabox10
Active Member
The answer is yes. And unfortunately there is no legal way to stop the cell phones from interfering. The only way that I know of would be to scramble the signals in the airways, but that is illegal.
The way high-class professional shows get around it is they're are normally allocated special frequency bands that are much cleaner signal-wise and they have much better microphones that operate very well using a couple of different frequencies so that if one drops, the connection is still solid on the other.
The way high-class professional shows get around it is they're are normally allocated special frequency bands that are much cleaner signal-wise and they have much better microphones that operate very well using a couple of different frequencies so that if one drops, the connection is still solid on the other.
Yes and no. Cell phones cannot directly interfere with the wireless link between your mic transmitter and receiver, because they are in different frequency bands and your mic receiver filters it out. However, cell phones CAN inject noise into your mic lines and cause beeping in your system. Because of this, we usually lie to the audience and tell them that their cell phone "will interfere with the wireless microphones used in this production."
Professional shows do not have access to any frequencies that we do not have access to - they simply plan their system out better and use better equipment (read: more expensive equipment). They also, as Foxinabox said, sometimes have two transmitters on a person to minimize the risk of losing the mic.
Examples of wireless systems used in high-end professional shows include Lectrosonics Digital Hybrid Wireless systems and the Sennheiser 5000 series systems.
Professional shows do not have access to any frequencies that we do not have access to - they simply plan their system out better and use better equipment (read: more expensive equipment). They also, as Foxinabox said, sometimes have two transmitters on a person to minimize the risk of losing the mic.
Examples of wireless systems used in high-end professional shows include Lectrosonics Digital Hybrid Wireless systems and the Sennheiser 5000 series systems.
Foxinabox10
Active Member
Actually, mbenonis, many professional shows do have access to different frequencies, especially in high-show traffic areas like on Broadway. I talked to the sound operator when I saw 42nd Street and she said they were running over 70 wireless mics (including 13 implanted in people's shoes to pick up the tap) and because of the large number that they, and every other broadway show uses, they were given access by the FCC to more frequencies than the average sound engineer is given access to. All of their microphones had to be specially ordered to accomodate the different frequencies.
Things to try to help with interference issues...
ban cast members from using them during shows, AND make sure that they are turned off!
always make sure that your not trying to use an active TV channel in your area (it's bitten me in #$% a few times!)
keep receivers on stage as close as possible to transmitters (and away from the audience.)
keep any antenna cables as short as possible.
with multiple mics, try to use an active antenna splitter with a band filter.
try reading thru some of the FAQ / Knowledge Base on www.shure.com
you may pick up some hints there.
ban cast members from using them during shows, AND make sure that they are turned off!
always make sure that your not trying to use an active TV channel in your area (it's bitten me in #$% a few times!)
keep receivers on stage as close as possible to transmitters (and away from the audience.)
keep any antenna cables as short as possible.
with multiple mics, try to use an active antenna splitter with a band filter.
try reading thru some of the FAQ / Knowledge Base on www.shure.com
you may pick up some hints there.
saxman0317
Active Member
PhantomD
♂
We have 8 shure UT systems in our permanent wireless mic system.
Last year, we had trouble with a couple of them dropping out (read: the receivers and transmitters were beside each other, receiver on, transmitter transmitting, receiver reporting no signal).
Can somebody who is familiar with the specifics of the UT systems tell me whether actors using phones could have contributed to this? Doesn't sound likely - but anybody else who may have a reason for this strange problem is VERY welcome to contribute!).
Last year, we had trouble with a couple of them dropping out (read: the receivers and transmitters were beside each other, receiver on, transmitter transmitting, receiver reporting no signal).
Can somebody who is familiar with the specifics of the UT systems tell me whether actors using phones could have contributed to this? Doesn't sound likely - but anybody else who may have a reason for this strange problem is VERY welcome to contribute!).
Chaos is Born
Active Member
I seem to recall something about there needing to be a degree of separation between transmitter and receiver. Maybe the transmitter & receiver were too close to one another? Are there frequency controls? Could someone have bumped one?
Sounds like an unusual problem.
Sounds like an unusual problem.
MRlettherebelight
Member
i have heard, not sure if this is fact, that the transmitters can overload the recievers if they are too close together. do they work if they are further away.
Two receivers close together can't overload the receivers, but they *can* cause intermodulation, thus possibly causing noise on other channels. If they are more than a foot or two away from each other they should work fine (unless your frequencies are poorly coordinated, in which case you're going to have problems no matter what you do).
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