Yaesu SCU-17 CAT- and sound card interface with built-in sound card
The Yaesu SCU-17 is an interface to run with digital operating modes for almost all current Yaesu transceivers. The SCU-17 works as a USB sound card, therefore only one USB cable is required between interface and computer. The interface isolates all signals galvanically to avoid potential ground loops. In doing so the audio-in and audio-out, PTT, FSK and CAT signals are transmitted. The key signals are seperated by Opto-isolators, the audio signals by coupling transformers.
The SCU-17 is protected by a metal box to avoid irradiation problems by HF. There are two control knobs on the front panel for the NF-levels (Input, Output). This way the modulation level is adjusted in seconds without having to bother with the sound card dialog of the computer. Furthermore the front panel has three LEDs displaying the status of 'Power', 'PTT' and 'FSK'. The SCU-17 uses the USB port as the power supply.
Shipment already includes several cables, which simplifies the use with current Yaesu transceivers. Some models require an optional cable. The SCU-17 is designed in a way that even transceivers with a classic RS-232 interface can be connected to modern computers via USB.
Installation requires to download and install the "Virtual COM Port Driver" from the website of Yaesu company. Caution: Install prior to connecting the interface to your computer! Drivers can be found on www.yaesu.com under 'Products', 'FT_DX1200', 'Files', 'SCU-17 USB Driver (Virtual COM Port Driver)'.
SCU-17 and FT-891
The FT-891 requires two connections to the computer:
- CAT function: A USB cable directly from the TRx to the Computer, not included in shipment.
- Audio/PTT: A 6 pin Mini-DIN cable from the TRx to the SCU-17, from there on via USB to the computer. These cables are included in the shipment of the SCU-17.
PTT keying of the FT-891 is either done by by CAT command or by keying the PTT line on the DATA socket, depending on what the digimode software supports.
- Included in Shipment of the SCU-17:
- Yaesu SCU-17 interface
- Printed user manual (english)
- USB A/B-cable
- NF-cable 2x 6pin Mini-DIN
- Serial cable 2x 9pin D-Sub
- 2x 3.5 mm stereo jack
|FT-817ND||Option CT-62 needed|
|FT-857D||Option CT-62 needed|
|FT-891||Optional USB A/B cable required|
|FT-897D||Option CT-62 needed|
|FT-991A||See footnote |
|FT-2000 (Variant 1)||Option SCU-21 needed|
|FT-2000 (Variant 2)||self-made with CT-39/A needed|
|FT-991A||See footnote |
|FT-DX5000 (Variant 1)||Option SCU-21 needed|
|FT-DX5000 (Variant 2)||self-made with CT-39/A needed|
|FT-DX9000 (Variant 1)||Option SCU-22 needed|
|FT-DX9000 (Variant 2)||self-made with CT-39/A needed|
Of course, with self-made cables you can connect virtually all other transceivers, of other manufacturers as well. The pin configuration of the SCU-17 interface is specified properly in the user manual.
Note about supplied cables
If someone requires spare cables for the SCU-17, those supplied are relatively simple to replace. The cable pinout is also documented in the manual of the SCU-17.
- USB A/B cable: This is a normal USB cable with Type A and Type B connectors, e.g. WiMo ref. 40072.18
- 6pin MiniDIN cable: Both sides identical pinout, like WiMo ref. 40103
- 9pin serial cable: straight connected, like WiMo ref. 40060.FF
 Other transceivers by Yaesu
Other transceivers by Yaesu, like the FT-991A or FT-DX3000 do not require a soundcard modem like the SCU-17. This is because these transceivers are equipped with a USB interface which offers the same functionality (i.e. CAT control, audio input/output).