Yaesu FT-891 Sound Card Interface Cable

The Yaesu FT 891 Transceiver has the capability to connect to a computer and operate data modes. Yaesu sells a cable but it does not come set up for plug and play operation. For what it is, the cable also seems expensive.

The connector on the cable is the same type as the PS2 style keyboard or mouse. After a quick search on amazon, I found several cables. I ordered a 6 foot male to male so the cut off end could be kept as a spare. If you order a non Yaesu cable make sure all pins are connected in the cable.

Ring out each pin with a multi meter. Use a label maker to mark the wires.
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Pin out of the connector looking at the back of the transceiver. This is were your cable plugs in.

For this project, I decided to install audio isolation transformers. These are 1:1 audio transformers and isolate the radio from the computer. These are relatively cheap and can be acquired from amazon or an electronics website.

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1:1 Audio Transformers
The extra terminal is for the DAKY wire. This is not needed and is for future use.
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Label your connections. This is often left out and a year from now you may forget how you wired it.
For the cable that attaches to the FT-891, plastic ties are being used for strain relief.
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FT-891 Interface cable ready for final testing.
First test was successful. Turned on the radio and Ukraine was the first to decode.
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Links

https://km4nmp.com/2019/03/30/yaesu-ft-891-review/

https://km4nmp.com/2019/07/21/getting-started-with-wsjt-x-and-the-yaesu-ft-891-transceiver/

https://km4nmp.com/2019/07/27/connecting-trx-manager-to-the-yaesu-ft-891/

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