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Impedance is the resistance to a non-DC current. It is the equivalence to resistance which a DC current and both are measured in ohms. Astatic D-104 microphones from back in the tube radio days is considered a high impedance microphone. An old D-104 with a crystal voice element checks in at around _4000 ohms_* which is considered pretty high impedance. The Yaesu MD-1 is an example of a low-Z desktop microphone for a solid state base ham radio transceiver. The impedance of this microphone is _????_ ohms* which is pretty common for solid state era microphones for the Kenwood, Icom, and Yaesu radios.There were different microphone element types used over the years during the development of the microphone which changed dramatically going into the modern solid state era. Originally many of the mass produced microphones used a crystal element which was both fragile and very high impedance. Later there were other ceramic element types used. ...more...Turner produced many different microphone types over the years and specifically produced microphones for ham radio earlier in the company history. The Turner 254HC was produced by Turner for ham radio and is high impedance, or hi-Z, at _????_ ohms using a ???? microphone element. Later Turner produced many models of Citizen Band microphones including the model ??? desktop microphone which had a 9v battery under the base. This is a powered microphone which is considered low-Z at _600_* ohms.Ohms resistance can be measured with a meter if you know the correct connector pins to use. ...more...Older high impedance microphones can be adapted for use on modern solid state amateur radio transceivers. ..more...