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What can I do to prevent audio overload of a transmitter? If I turn the gain down enough to prevent overload, the gain isn't high enough to prevent hiss and noise.


This reply was posted to this question on the RAMPS group:

Most wireless systems, even some "pro" systems do not have a limiter-compressor in the transmitter. This forces you to do exactly what you are describing, which is to attenuate the mic input to prevent the occasional overload. All the Lectro transmitters for the last 15 years have a shunt FET limiter before the input preamp. The nice thing about the shunt limiter is that it is out of the audio circuit until a potential overload comes along, then the excess signal is shunted away. The limiter has a range of 25 to 30 dB. At usual gain settings, the transmitter won't overload until after the typical electret lavaliere microphone is already clipping.  

Interestingly, the Vega microphones from years ago had a very effective limiter using an LED/LDR (Light Dependent Resistor). Vega referred to it as a "soft compressor" and it was. Though it wasn't effective when the transmitter gain was set low, for real world use, it was very nice sounding and, in my opinion, one reason Vega was the number one pro wireless. More interestingly is the fact that most current wireless mics have taken a giant step backwards by leaving limiter-compressors out of the bag of design tricks. Check the specs on the data sheets to see if there is an input limiter-compressor. Chances are there isn't one. The COMPANDER used in all current wireless mic systems has nothing to do with the input limiter by the way. The input limiter is in addition to the compander and additionally increases the usable dynamic range.

Posted 1 year agoby LectroAdmin