used by the Security people at the NAMM Show
Here is the same RF spectrum filtered by a CNK Engineering Bandpass Filter. Notice the TV stations adjacent to Channel 27&28 are buried in the noise floor and the walkie-talkie signal is attenuated 40dB. We picked TV Channels 27&28 for illustration purposes so you could see the bandwidth of the filter, you would not want to operate your wireless microphones in the same frequencies with a TV Broadcast. Reducing adjacent signals within the tuning range of your wireless mic receiver improves it's sensitivity.
Here is the raw RF spectrum from 410 to 710 MHz on the plaza outside the Anaheim, California Convention Center at the 2016 NAMM Show. The markers show TV Channels 27&28
The RF Spectrum available to operate your Wireless Microphones is shrinking….
…..and the number of devices using that shrinking spectrum is increasing. Digital TV channel re-packing has crowded the available spectrum. To further complicate the matter, wireless broadband companies (the folks who provide the services for the smart phone in your pocket and the tablet you just sent the concert video on) already took the 700MHz band and after March 2016, the 600MHz part of the spectrum will be auctioned off for wireless broadband (LTE) use. TV stations will be moved and after a transition period, wireless microphones will no longer be allowed to operate in the 600MHz band. Small Cell LTE and DAS technologies will exaggerate the problem in large audience venues. In order to assure the best possible performance for your wireless microphones it is important to present only the signals of interest to your receiver. Nearby signals, although not on the channel your receiver is tuned to may reduce the sensitivity of your wireless microphone receiver. Lower receiver sensitivity means more signal dropouts and reduced operating range. CNK Engineering can help you get the best performance from your existing equipment and plan for the best way to transition to new equipment after the spectrum auction.
Make your wireless better Decades of RF engineering creating reliable communications equipment for military and space applications are behind CNK Engineering’s RF solutions. Our equipment is designed to be drop in compatible with your existing FM and Digital UHF wireless microphones and instrument link equipment.