Some time ago I bought one of these small and light 2 in 1 tablets with Windows 10. The device was very small in size but the battery lasts very long. With only 1,7kg the weight was not too high for my portable ops. I did not take it into the field yet. The reason was simple: The tablet has one USB-port only. I need one port for the USB cat lead and another one for the USB-soundcard to connect my existing PC-interface made by Alan, M0AQC. After a long search on the internet I did not find a simple FT-817 interface with one USB lead, CAT-control and built-in soundcard. So what did I do? I built an interface that meets my requirements by myself.

I found the website from Dan, YO3GGX. He had the idea to put a cheap chinese USB CAT-interface, a USB soundcard and a USB-hub in one single box and solder everything together. I did it this way too, but for the audio path I used 2 600 ohm 1:1 transformer, which I ordered in China. They cost only 4€ incl. shipping and they work just fine. I trigger my PTT via CAT, not via the sound outlet of my FT-817. Not sure why Dan used the PTT which comes in the audio socket.

Here are his "manuals", from this documents you get the idea how to build your own interface:

FT-817 DIY Data Modes miniature USB interface

FT-817(ND)/FT-857/FT-897 DIY Data Modes miniature USB interface version 2

My USB soundcard came from China for 1 Euro shipped (!), the USB-hub was 3 Euro and the CAT-interface was 5 Euro shipped from Hong-Kong. The plastic box came from Conrad Electronic and was rather expensive with 3 Euro. The 8 pin mini din connector was taken from the USB-CAT interface and the 6 pin mini din connector for the sound in/out was also around 1 Euro. The whole project was about 15 Euros in total.

Here are 2 useful links for the sound in/out module:

I tested the interface after I assembled everything and PY1ON came back to me. Brazil, 9377.9 km (5827.1 mi). That was a nice moment, when the hard work paid off.

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0 # Erich 2016-10-27 16:40
Warum PTT über Sound.
Ich habe ähnliches gemacht. Speziell für den FT-840. Und der wird von verschiedenen OM's benutzt die den eigenen PC vewenden. Darum empfehle ich denen zB fldigi zu verwenden das ein 1000Hz PTT Signal auf dem rechten Kanal ausgibt. Natürlich man hat kein CAT dafür ist es sehr leicht für Ungeübte das in Betrieb zu nehmen.
Habe auch 2 Stk NF 600:600 genommen und für das PTT ein 600:600 mit Mittelanzapfung.
Es steht und geht alles, bin aber grad in HS und kanns noch nicht fertig publizieren.
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