microHAM USB-III: CAT- and Sound Interface with soundcard

The USB-III CAT interface contains an own soundcard, which is connected via USB to the computer. So you don't need separate audio cables to the computer anymore, the original sound card of your computer remains free for other applications. The sound card of the USB-III device offers two distinct advantages over standard cards: a lower noise level and a higher dynamic range (typ. 87dB). This makes this sound card much more suitable for demanding amateur radio applications. All connections to and from the computer and radio are isolated either by transformers or optically. Control lines exist for CAT, PTT, CW/FSK and Squelch.

The USB-III interface works with all computers with USB connector. 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.

What is Pseudo-FSK/Pseudo-CW?

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) 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 USB-III interface detects the presence or absence of the tone and uses this information to key the FSK or CW line to the radio.

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.

  • No COM or LPT port necessary, just one USB port
  • Complete "Computer <-> Radio" electrical isolation
  • Integrated computer control port for all radios CI-V, FIF-232, IF-232, RS-232
  • Squelch input for signaling to computer
  • No external power adapter required
  • Strong RFI immunity
  • Quick change connectors
  • Two controls for TX and RX audio
  • Pseudo-FSK, Pseudo-CW keying for certain programs (fldigi)
  • LEDs for easy visual feedback of CAT, CW, PTT, SQL
  • Metal/Aluminum case, powder coated and silk screened
  • Free, time unlimited firmware/software upgrades via internet
Technical data
  • USB: USB 2.0 Full speed , USB 1.1 compatible
  • CAT RXD, TXD, max. 57600 Bd
  • CW: open collector, driven from DTR, max 30V/400mA
  • PTT: open collector, driven from RTS, max 30V/400mA
  • FSK: open collector, driven from DTR (requires EXTFSK from MMTTY. or pseudo FSK from fldigi)
  • SQL input: close to ground or high (two inputs) to activate. Wired to CTS
  • Size: 103 mm x 28 mm x 101 mm (BxHxT)
  • Weight: 220 gr (without cables)
  • USB-Interface II
  • CD-ROM with driver software, manual
  • USB cable (A/B)

Important: Cable to radio needs to be ordered separately!

USB-III Interface

Order No.
USB-3 microHam USB-III CAT & Soundcard Interface 139.00 € 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