How to choose a right microphone
Selection of the correct microphone type is one of the most important decisions we have to make on the setting up equipment process. Our company offers a variety of solutions in this field from hi-tech models of Knowles, to the manually produced specifically for our 600-Ohm these dynamic microphones. And as far as special order we are able to set the communication by almost any parameter that if operating conditions set does not differ significantly from the generally accepted standard following selection scheme should be regarded as a reasonable compromise for money and 99% have no reason to look for more sophisticated and more expensive construction:
- For aviation headsets used in flight on certified civil aircraft that meet the requirements of the GA (General Aviation), ie eg. Cessna 172, reference solution is electret microphone with an impedance of 2.2 kOhm. The microphone is connected to the specially prepared by our company preamplifier ensuring backwards compatibility with all radios and intercoms used in civil aviation. It should be noted that the use of a condenser microphone is possible because the GA standard also forces on certified aircraft engines manufacturers to use special electromagnetic distortion suppression installation.
Where a standard electret condenser microphone will not work?
If the aircraft does not have the suppression equipment, it has an open cabin design, is unusual and previously used communication solutions have not worked, you can rethink the changes in the standard microphone to another, tailored to the specifics of the operation field. But be aware that this change may result in loss of compliance with the GA standard and for example, the lack of compatibility with the other manufacturers headsets. If you choose other than standard electret microphone, we recommend prior consultation with the technical department of our company.
- For headphones and headsets used: in powered paragliding flights (PPG), in an environment of increased noise level, to cooperate with portable FM radio stations on the UHF and VHF, where machines generating electromagnetic interference (eg. internal combustion engine with spark ignition), in the area exposed to strong air blast the preferred solution is 600 Ohm dynamic microphone. This type of microphone is more directional characteristics than the condenser microphone and should therefore be placed close to the mouth.
- Some manufacturers, such as. Company Yaesu / Vertex recommends the use of radio for its dynamic microphones with a resistance of 150 ohms. In case of doubt also we recommend prior consultation with our technical department.
- A separate topic are the sets for military solutions. In this case, the standard are microphones whose resistance falls within the range of several to tens of Ohms. We strongly advise against the use of military equipment for the civilian area.