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3 pin stereo plug connector layout
Разъем 3 pin stereo plug
at the radio
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The connector exists out of a combined 2,5- and 3,5 mm jack. The 2,5mm one is used as ground and for an external speaker, the 3,5mm one powers the PTT switch and microphone.


2,5mm jack connector

Pin Function
1 (tip) External speaker signal
2 (ring) GND
3 (sleeve) GND

3,5mm jack connector

Pin Function
1 (tip) Not connected
2 (ring) Microphone (should be AC coupled)
3 (sleeve) PTT switch (pulled low to GND when pressed, otherwise floating) 
           1 ------------------ /|
2,5mm jack                     | | SPEAKER
           2 ---+---+--------+- \|
                |   |        |
           3 ---      /      |
                     / ---|  |
                    |        |   __
           3 -------          --/  |
3,5mm jack                     (   | MICROPHONE
           2 --------||---------\__|
                    + 10µF
                      capacitor
           3

 

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Источник(и) этой и дополнительной информации: http://kenweb1.kenwoodusa.com/KenwoodPortal/KenwoodComm/Resources/AMA_Connectors/Connector.pdf
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