I had a computer headset with a boom mic that no longer worked. I think the small wires inside the molded plugs had broken.
I had always been impressed with the audio quality of these relatively cheap Logitech headphones and microphone. The mic naturally has a strong mid-range peak that I think lends itself very well to HF work and getting heard in a pile-up. But that’s just my theory.
I had been successful wiring up my Kenwood MC-50, using pinouts I found on the Internet. The mic jack for the FT-857 is an RJ-45. The pinout for the FT-857 is as follows:
1 – FAST Scan
2 – Ground
3 – PTT
4 – MIC +
5 – MIC Gnd
6 – +5 Volts DC
7 – Up
8 – Down
The tricky part is figuring out which pin is pin1! I used an old CAT 5 network cable, and I used the following pins: 2, 3, 4, 5 and 6. On my cable, these were white/brown, green, white/blue, blue, and white/green. Color codes can vary, so double check. If looking at the microphone jack directly, pin 1 is all the way to the right.
The following site was very helpful to me in getting pin outs for Kenwood and Yaesu: G4WPW Microphone Connections
Here’s what I ended up doing and after a few HF contacts, and some on the local repeaters I’m convinced it works pretty well.