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These newer HTs seem to have a different pinout than the older Yaesu HTs. The older HTs used a single 3.5mm TRRS plug - these use a two-plug connector, with a 2.5mm jack and a 3.5mm jack, similar to the Kenwood/Baofeng style, but with the two plugs closer together.
What are the the different contacts on these two plugs, and how would you trigger PTT?
This doesn't quite answer your question, but may get you closer.
This cable at Mobilinkd works on the FT-65R HT. They describe it as working with any radio that uses a uses a Motorola M1 style connector. You may be able to back into the information you want through that Motorola M1 lead.
I've actually had the same question myself, so I'll update this thread if I find more information.
ok. so here's what i have figured out. the large jack (3.5mm) has the external speaker output at the tip of the jack.the last ring is the ground,obviously for that audio output. Now, for the mic/ptt switch i have found this :connected a bare bone 2.5mm stereo mini jack at the other input. I connected the GND (last ring) with the tip of the jack through a 1K resistor (for safety of not shorting anything) and VOILA..the tranceiver light went to red and transmission begun! eureka! .now if you connect in series with the switch a typical mic from a mobile handsfree headset instead of the 1k resistor as load, (mine was ~960 ohm) you get it working. The yaesu ft-25 i tested has a 3.3V voltage acros the head of the jack and the Gnd.
