DigiKeyer-2 external soundcard with CAT interface

More than just a soundcard interface - DigiKeyer-2

Significant differences to the predecessor microHam DigiKeyer:
- Winkey Chip for precise morse keying added
- Foot switch added
- Support for pseudo-FSK (fldigi) and OOK (Audio On/Off keying by cocoaModem)
- AF output for integration with the Micro-2R SO2R station controllers

The DigiKeyer-2 is much more than an interface, because it is an own, self contained soundcard. Together with the other integrated components like CAT interface and PTT/FSK/CW keyer this is a very versatile interface for all special modes. Use RTTY, Fax, SSTV, Echolink, PSK31, MFSK, Olivia, WSJT, APRS and many more, everything which is supported by a soundcard.

What is Pseudo-FSK/Pseudo-CW/OOK?

For 'real' FSK keying one would normally require a true UART chip in the computer (parallel to serial converter, COM-Port). With a virtual COM port such a device is simulated by the USB driver, but only with some problems. Depending on the load of the computer the timing of keying can vary (jitter) or be delayed (latency). This leads to not very clean telegraphy keying. With RTTY/FSK the characters might be illegible on the receiving side due to timing errors.

Now some multi mode programs (e.g. fldigi or cocoaModem (MacOs)) have found a good solution to this USB driver issue. Instead of toggling a handshake line of the virtual comport, an audio signal is sent (or not) to the right channel of the soundcard output. An additional hardware decoder within the interface detects the presence or absence of the tone and uses this information to key the FSK or CW line to the radio. With cocoaModem this mode is called OOK, Audio On/Off Keying

This leads to a much more precise timing with FSK and CW. Especially when using high speed telegraphy or QSK this is very beneficial. When using RTTY/FSK you can be sure that all characters are sent with the proper and consistent baudrate.

Of course the radio must support FSK keying to use this function with RTTY. When using AFSK this problem does not exist.

  • With the integration of a high-quality soundcard you have several advantages:
  • The internal soundcard remains free for other tasks, e.g. system sounds
  • No noise like often seen with soundchips on the motherboard
  • Developed by radio amateurs for radio amateurs: much better dynamic range and less noise as with simple consumer cards
  • No need to change soundcard connections on your PC
  • Two line-in channels for AF from Main and Sub VFO (where supported)
  • Better AF quality with notebooks, where the microphone input does not offer the right impedance
  • Support for practically all OS due to native USB soundcard drivers
  • Only one cable between interface and PC: a standard USB cable
  • microHAM USB Device Router and microHAM Device Configurator are compatible with all 32bit and 64bit versions of Windows 7, Windows 8, Vista, XP, 2000 and 2003.

Of course all connections between radio and PC are electrically isolated to avoid noise loops. Between the DigiKeyer-2 interface and the PC just a standard USB cable is required. And also from interface to the radio it's only one cable, which usally connects to the rear connections of the radio. This greatly simplifies station setup.

The integrated CAT interface transmits frequency and other information between PC and radio, most manufacturers are supported: Icom, Kenwood, Yaesu, Elecraft, JRC, and TenTec. Depending on type a level conversion is done by the interface.

With just one cable between DigiKeyer-2 and radio all connections for CW, PTT and FSK keying are done. Further the interface offers two more time delayed PTT lines for power amplifier and pre-amp keying.

A connection on the rear side of the DigiKeyer-2 is used for a PS/2 keyboard (full or 10 Keypad, see below). With this keyboard pre-defined texts can be recalled for digital modes like RTTY and for CW.

A special AF output serves to connect to the Micro-2R SO2R station controller by microHam. This allows you to integrate the DigiKeyer-2 perfectly into your SO2R station.

The cable between DigiKeyer-2 and radio is individual to each radio model and must be ordered separately. We offer cables for most radio models. If the interface will be used on several radios, just order one cable for each radio.
Weight 1.1kg, Size 165 x 44 x 110mm. We offer an optional 10 keys keypad MK-KEYPAD, see below.

Order No.
DK-2 microHam DigiKeyer-2 Soundcard Interface 260.00 € Buy now
Info freight charges
DB15-IC7800 DB15-IC8 DB15-IC13 DB15-TS6 DB15-TS9 DB15-TSMINI6 DB15-TS990 DB15-FT450 DB15-FTMINI8 DB15-FT736 DB15-FT847 DB15-FT890 DB15-FT920 DB15-FT950 DB15-FT990 DB15-FT1000M DB15-FT1000D DB15-FT9000 DB15-TT-OM DB15-EL-K2 DB15-EL-K3 DB37-AL100 DB38-AL100

List of cables for microHAM "digiKEYER", "USB-2" and "USB-III" interfaces

microHAM Cable
Order No.
DB15-IC7800 Cable for Icom IC-7800, IC-7850, IC-7851 59.40 € Buy now
DB15-IC8 Cable for various Icom (List) 59.40 € Buy now
DB15-IC13 Cable for various Icom (List) 59.40 € Buy now
DB15-TS6 Cable for various Kenwood (List) 59.40 € Buy now
DB15-TS9 Cable for various Kenwood (List) 59.40 € Buy now
DB15-TSMINI6 Cable for various Kenwood (List) 59.40 € Buy now
DB15-TS990 Cable for TS-990 59.40 € Buy now
DB15-FT450 Cable for Yaesu FT-450, FT-991 59.40 € Buy now
DB15-FTMINI8 Cable for various Yaesu (List) 59.40 € Buy now
DB15-FT736 Cable for FT-736 59.40 € Buy now
DB15-FT847 Cable for FT-847 59.40 € Buy now
DB15-FT890 Cable for FT-890, FT-900 59.40 € Buy now
DB15-FT920 Cable for FT-920 59.40 € Buy now
DB15-FT950 Cable for FT-950, FT-DX3000D, FT-DX1200 59.40 € Buy now
DB15-FT990 Cable for FT-990 59.40 € Buy now
DB15-FT1000M Cable for Yaesu FT-1000MP, FT-1000MP MkV, FT-1000MP MkV Field, FT-2000, FTDX-5000(List) 59.40 € Buy now
DB15-FT1000D Cable for Yaesu FT-1000D 59.40 € Buy now
DB15-FT9000 Cable for Yaesu FT-DX9000 59.40 € Buy now
DB15-TT-OM Cable for TenTec Omni VI, Omni VI+ 59.40 € Buy now
DB15-EL-K2 Cable for Elecraft K2 59.40 € Buy now
DB15-EL-K3 Cable for Elecraft K3 59.40 € Buy now
40062.15M SUB-D 15-pin single connector, Male 2.80 € Buy now
Info freight charges

DigiKEYER List of cables and schematics

DB15-IC8 Icom IC-707, IC-725, IC-726, IC-728, IC-729, IC-735, IC-736, IC-737, IC-738
IC-746, IC-746Pro, IC-7400, IC-756, IC-756Pro, IC-756ProII, IC-756ProIII
IC-761, IC-765, IC-775, IC-7600, IC-7700, IC-781, IC-910
DB15-IC13 Icom IC-703, IC-706, IC-706mkII, IC-706mkIIG, IC-718, IC-78, IC-7000, IC-7100, IC-7200, IC-7300, IC-7410, IC-9100 Schematic
DB15-TS6 Kenwood TS-140, TS-440, TS-450, TS-680, TS-690
TS-711, TS-790, TS-811, TS-850, TS-940, TS-950
TS-140, TS-680 - benötigt Kenwood IF-10C
TS-711, TS-811 - benötigt Kenwood IF-10A
TS-940 - benötigt Kenwood IF-10B
DB15-TS9 Kenwood TS-570, TS-590S, TS-870, TS-2000 Schematic
DB15-TSMINI6 Kenwood TS-480HX, TS-480SAT Schematic
DB15-FT450 Yaesu FT-450, FT-991 Schematic
DB15-FTMINI8 Yaesu FT-100, FT-817, FT-857, FT-897 Schematic
DB15-FT736 Yaesu FT-736 Schematic
DB15-FT847 Yaesu FT-847 Schematic
DB15-FT890 Yaesu FT-890, FT-900 Schematic
DB15-FT920 Yaesu FT-920 Schematic
DB15-FT950 Yaesu FT-950, FT-DX3000D, FT-DX1200 Schematic
DB15-FT1000M Yaesu FT-1000MP, FT-1000MP MkV, FT-1000MP MkV Field, FT-2000, FT-2000D, FTDX-5000, FTDX-5000D, FTDX-5000MP Schematic
DB15-FT1000D Yaesu FT-1000D (requires ROM Version 6.0 or higher) Schematic
DB15-FT9000 Yaesu FT-DX9000, all Versions


10er Tastatur

The 10 Keypad is directly connected to the microKEYER and allows control of various CW functions, like recall of stored standard buffers, adjusting speed and many more. The RTTY functions require a full PS/2 keyboard (a USB keyboard will not work!).

Order No.
MK-KEYPAD 10 keypad 25.40 € Buy now
Info freight charges