Question about Sennheiser 100/500 G2 Series Wireless Combo Kit EW150ENGG2C Microphone

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Frequency clash i run sound for my school and we just recently got 8 Sennheiser ew 100 g2 wireless microphones. they are brand new and all have the same frequency. Now....i know how to set it but since we have 8 i decided just randomly coming up with numbers is a bad idea(we have a feedback issue as it is) so i was hoping someone out there might have an idea of how i should assign frequencies (also note that there will be a total of 12 microphones running at once for the show) to minimize feedback and signal crossing.

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Download Sennheiser intermodulation software called SIFM
http://www.sennheiser.com/sennheiser/home_en.nsf/root/professional_wireless-microphone-systems_sifm-software...after learning where your open TV stations are, (with the freq finder http://www.sennheiserusa.com/findfrequency/default.asp)
you can insert numbers at least 200 khz apart (never the same distance though!) in to SIFM for intermod calculation)
I dont know about your feedback problem but this is how you set yourself up for clean transmition. here is some info on intermod..
http://www.sennheiser.com/nordic/icm_no.nsf/resources/User_Manual_pro_US.pdf/$File/User_Manual_pro_US.pdf

Posted on Jul 15, 2009

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There are different frequencies available and being used in each location.

To get a basic idea of which frequencies are available in your area, try this online tool:
http://www.sennheiserusa.com/findfrequency/
or use the literature provided with the Sennheiser gear (usually a useful chart comes with the wireless gear).

Also, remember that your transmitting frequencies need to be spaced apart a minimum of .400 MHz (or 400 kHz).

Frequency selection shouldn't cause feedback problems though. If you select a frequency for a mic that a local TV station is already using to broadcast, it will cause RF Interference (Radio Frequency). You'll probably hear static noises, pops, or since your Sennheiser has a Squelch feature, just drop-outs in audio.

So first consult the available charts to find a set of frequencies that should be available in your area. Then, if one of your mics is experiencing such an issue, try moving it .400 MHz to the nearest unused frequency and see if the RFI goes away. Repeat until the RFI no longer manifests.

Posted on Jul 06, 2009

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