Thanks for the replys. I will check the squelch settings. Could one of you explain your meaning of "Coordination." I have always try to set all the mics with plent of space in between them on the freq band, and used the scan feature to find open freqs. Thanks Nick
... once you hit 3 or more it is possible to generate an IM product that is the same as or very close to one of the frequencies that you are trying to use. ... You need to calculate these or use only the preset frequencies in the same group for a mic system. Adding another frequency range may make the preset groups at least partially unusable.Lee
Lee, What tool does one typically use to determine the 'best set of non-interfering frequencies' for multiple mics, taking into account the effects of IM distortion. Excel? Purpose built?It also sounds like you are saying that some (all?) manufacturers have done this work for you already, and you are safe to just use the manufacturer's presets within a given group (which I think means manufacturers frequency band, e.g. Sennheiser Band A). Is that correct? As simple as that?
Yes, it can be as simple as that. It can also get much more complex as you add additional frequency ranges...
Two other questions: is the IMD generated in the transmitter, receiver, or both?If in the receiver (for mics), can the problem at least partially be resolved by spreading out the receivers, e.g. a few stage right, a few stage left, a few at FOH,... Obviously this is a hack compared to proper coordination, but I'm trying to understand the physics involved.
IMD happens in the head end electronics (input) of the receiver.Spreading out the receivers won't really help but a properly deployed antenna splitting system and appropriate RF gainstaging can help tremendously.Lee
IM can happen at any gain stage in the RF system, but the most common mode is inside the transmitters. Two transmitters very close together will each have the other leaking into their transmitter stage creating the IM products. If you have access to a scanner or spectrum analyzer, look at a couple of mic transmitters, then hold them both in 1 hand and see what happens to the RF spectrum.Mac
Hi Nicholas,1) Signal and pilot indicators together usually indicate that another nearby mic is on and tuned too close in frequency. If not, or if it continues with the antennas disconnected, the receiver may be malfunctioning.2)You must coordinate frequencies with the other nearby mics. A minimum frequency separation of 350KHz for G3 is a good rule of thumb.3) Adjust the squelch on your receivers.4) Always mute wireless channels when not in use. It is standard best practice when mixing.
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