Digirig’s audio cable looks like this:
GX pin 1 (MIC) → 3.5mm TRRS ring 1 (RIG_AFIN)
GX pin 2 (PTT) → 3.5mm TRRS ring 2 (RIG_PTT)
GX pin 4 (GND) → 3.5mm TRRS sleeve (GND)
1/4" TRS tip (PHONES) → 3.5mm TRRS tip (RIG_AFOUT)
Please report results of your homebrew builds or voice your interest in this cable added to the store.
Looks interesting, but I probably would not be interested in getting a cable for my TS-820s.
My foray into using it for PSK with a homebrew interface many years ago was frustrating as my radio had a tendency to blow a fuse during the middle of a QSO. Easily replaceable and available, but I made the decision that the radio really did not like Digital duty cycles and just use it for SSB/AM now.
I’ll see if I can dig up the schematics for that homebrew rig and see how it matches your wiring. Who knows, maybe my original set up was wrong.
It is nice to see you continue supporting this device and developing cables for new ratio types.
73
Randy KAØAZS
I would like to see such a cable in the shop 
This would make it much easier for me to bring my TS-120V back in service
73, Stephan
On the Kenwood hybrid groups.io I learned that these rigs work fine on digital modes but it is necessary to run at low power because of the high duty cycle. Check out Kenwood-hybrids@groups.io
73
Doug KF0PCW
I’ll probably build this cable, and use it on a Kenwood TR-7400A transceiver and a Midland 13-513 (220MHz) transceiver. Will check the pinouts on the mic connectors. Will need appropriate ferrite chokes. Thanks for posting.
I got a setup to work enabling my Yaesu RJ-12 Digirig to send/receive data for my Kenwood TS-820S. Pic below. A few notes:
Connecting the ground/mic/PTT from your Digirig input connector type works perfect.
The radio input from the Kenwood to the Digirig must go through the 3.5mm speaker output on the rear of the rig. Using a 1/4 in pin adpater to use the front headphones output does not work, at least on my setup.
EDIT: The PTT works fine in MAN mode for RTS and the right COM port. If there are software issues triggering PTT you can still get it to work fine in VOX mode.
As stated earlier, these tubes are sensitive to duty cycles so dont leave them on FT8 etc. all day. 15 min transmit 15 min rest is probably a good idea.
Thanks for the report.
With radio’s VOX enabled, are you certain you key up with Digirig’s PTT by RTS?
You can test it by shorting sleeve to ring2 on Digirig’s end of the cable.
My fault…PTT works fine in MAN mode, I had the wrong PTT setting in software. Changed to RTS and right COM and all works well. Thanks.
One more thing…since digital modes are 100% duty cycle you should monitor power usage with the meter in IP mode and try to stay below 110mA in transmission or the tubes can get hot QUICK
