Please note that not all microphones are wired the same way.
For example, just because two different microphones are 4 pin does not mean that they are wired the same, even if they are the same brand! Different manufacturers may wire their microphones differently. Generally, a radio manufacturer will wire their microphones the same so that the microphones are interchangeable between their radios, however, this is not always the case.
An example of when two microphones are both 4 pin but wired differently: Cobra 4 Pin radios are wired 1) Shield 2) Audio 3) Transmit 4) Receive while Midland 4 Pin radios are wired 1) Audio 2) Shield 3) Receive 4) Transmit. There are some radio brands that have the same general wiring (such as Cobra and Uniden) but that is not always the case.
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