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4 pin 3.5mm (2.5mm) plug connector layout
4 pin 3.5mm (2.5mm) plug connector
Yaesu / Vertex HT Microphone/SP Cable Pinouts

The VX-6R/E, VX-7R/E,VX-8R/E, VX-8DR, VX-120, VX-127, VX-170, VX-177 and all models that include the CT-91 adapter in their accessory list use a threaded, waterproof version of the same 3.5mm plug 

Pinouts for both, starting from the tip, are as follows:

Pin Function
Speaker
2 Cloning
3 Mic
Ground

Pin 2 is the clone RX/TX pin. Not used except in programming the Radio.

Speaker/mic cable for the Yaesu VX-170, VX-6R, VX-7R, VX-120 and others. This cable has the unusual and hard-to-find threaded 3.5mm 4-conductor connector with o-ring.

You should check that the connections match your particular radio. Connections used only for cloning or programming are usually NOT present in these cables.

Handhelds using the 3.5mm/2.5mm 2 prong connector including the FT-411, FT-470 , FT-530, FT-51R, FT-11R, FT-41R, FT-23R, FT-203R, FT-416, FT-703R, FT-109R, FT-109RH, FT-209R, FT-209RH, FT-709R, FT-709RH, FT-727R,

Pin Function
3.5 Ring Ground
3.5 Tip Rx audio
2.5 Ring Ground
2.5 Tip Mic Audio


Handheld models including the FT-10R, FT-40R, FT-50R, FT-60R, VX-1R, VX-2R, VX-3R, VX-5R, VX-110, VX-150, and any other model including the CT-44 adapter and MH34b4b speaker microphone in their accessory list utilize the non-threaded 4 conductor 3.5mm type microphone plug

Pinouts for speaker and mic are reversed on the vx-3r

There should be a 2.2k-ohm resistor between the mic and shield to activate the PTT

According to 10 reports in our database (5 positive and 2 negative) this pinout should be correct.

Is this pinout
Yaesu / Vertex VX and FT series Handheld Microphone / Speaker Mic visual pinout:click to enlarge
Source(s) of this and additional information: http://wiki.argentdata.com/index.php?title=Radio_Wiring, http://pinouts.ru/connector/4_pin_3.5mm_2.5mm_plug_connector.shtml
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