Price: $425.00

Manufacturer: MH-DIGI KEYER-II
Availability: IN STOCK
Warranty: microHAM

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Figure 1: DIGI KEYER II™ block diagram

  • No serial or parallel port required:

– just one USB cable between your computer and microKEYER II
– Fully integrated: Sound Radio Control, true FSK, CW and PTT
– Computer sound card is not used

  • Complete “Computer Radio” electrical isolation

– transformer isolation between sound circuits and radio
– optical isolation between USB port and of ALL digital signals:
Radio Control, CW, PTT, FSK, PA PTT, & LNA PTT

  • Standard Sound Device – no custom drivers:

– The microHAM CODEC is an industry standard device recognized by Windows, Apple OS 10 and LINUX.
There are no custom device drivers to install and no compatibility problems with your favorite applications.
– Sound card connection for micro2R

  • Ultra low noise:

– The sound circuits are designed with special attention to low noise
– The receive noise floor in DKII is lower than any value priced
sound card or similar amateur product.
– Dynamic range rivals that of professional products.
– Special circuit design maintains full dynamic range and low noise floor
with all radios
– both high level and low level outputs.

  • Compatible with most standard Windows software

– special microHAM USB Device Router creates as many virtual COM ports
as needed to function fully with your favorite programs
– customizable presets allow instantly changing configuration
when switching programs

  • Supported by MacLoggerDX on Mac OS X

– supports cocoaModem and other Macintosh applications.

  • Integrated control port for all radios: CI-V, FIF-232, IF-232, RS-232

– fully supports Elecraft, Icom, JRC, Kenwood, Ten-Tec, and Yaesu radios

  • Dual Channel Receive:

– supports dual receive with transceivers like the Icom 7800, Yaesu
FT-9000, FT-5000, FT-2000, FT-1000D/MP/Mark V, Kenwood TS-2000 and Elecraft K3.
– independent, front panel level controls for each receiver

  • Front Panel Level Adjustments:

– Pots for Transmit level, Main Receiver level and Sub receiver level
– no need to fumble with Windows Mixer to control levels

  • Integrated K1EL WinKey™ chip with extended capabilities

– front panel speed knob
– nine (9) user programmable memories
– internal paddle buffer for improved reliability.

– PS/2 keyboard support for direct CW generation.

– PS/2 keyboard/keypad support for instant CW message playback
– PS/2 keyboard/keypad CW work without a computer connection
– auto PTT
– selectable side tone
– all parameters are stored in EEPROM and reloaded on power up

  • FSK keying output

– capable of sending 5/6/7/8 bits and 1/1.5/2 stop bits
– PS/2 keyboard support for direct FSK transmission without a computer
– PS/2 keyboard support for instant FSK message playback
– PS/2 keyboard works without a computer connection

  • Sound card Right channel audio detector and FSK/CW driver

– FSK output for FLDIGI “pseudo-FSK” and cocoaModem OOK mode
– Provides a “hard keyed” CW output for software that generates only audio (sidetone) CW

  • Independent keying buffers for Power Amplifier and LNA switching

– extended range solid state output for low voltage T/R lines or QSK
– relay isolated output for vintage PA with negative voltage T/R lines
– Bypass LNA before activating both PTT circuits for EME or scatter

  • Footswitch input with programmable functions

– programmable PTT activation delay in 1ms steps
– selectable muting of CW and/or FSK when footswitch is closed

  • Squelch input for signaling to computer

– two inputs, one is active low, second is active high

– ideal for Echolink and remote interfacing applications

  • No external power adapter (where the radio provides auxiliary power)

– No noisy DC to DC converters
– USB and Sound chip are powered from the computer USB port
– Controller is powered from transceiver or transceiver power supply

  • Strong immunity from RFI

– integrated chokes and filters for best RFI immunity
– advanced shielding and circuit design to suppress RFI generation

  • Input/Output connectors

Computer: USB, Radio: DB15, Paddle: 6.3 mm, Sub RX: 3.5mm
PS/2: MiniDIN6, u2R: 2×3.5mm

  • Metal/Aluminum case, powder coated and silk screened
  • Free firmware/software upgrades via internet


USB: USB 1.1 and 2.0 compatible

Power consumption:
USB – less than 100mA
Transceiver side less than 200mA at 13.5V (max. 16V)

Radio Port: RxD, TxD – max. 57,600 Baud
Levels: TTL, inverted TTL, open collector bus, RS232

CI-V Port: open collector bus, max. 9600 Baud

CW: open collector bus, max 30V/400mA

FSK: open collector, max 30V/400mA
– supported 5/6/78bit data length, 1/1.5/2 stop bit, up to 300 Baud

PTT: open collector, max 30V/100mA

PA PTT: selectable by jumpers
– open collector, max. 48V/0.8A
– relay contact, max. 48V AC/DC 1A

LNA PTT: selectable by jumper
– open collector, max. 48V/0.8A
-relay contacct, max. 48V AC/DC 1A1

Foot Switch: active when closed to ground, max load: 1 mA at 5V

PTT IN: active when closed to ground, max load: 1 mA at 5V

Audio Out:
– single channel (left)
– output impedance:600 Ohm

– output level: 1.5V p-p (max)
– AC coupled
– 3dB bandwidth: 0.2 – 3KHz typical
– Sampling rates: 32000, 44100, and 48000 Hz

Audio In:
– dual channel (stereo)
– input impedance: 50k Ohm

– input level: 4V p-p (max)
– AC coupled
– 3dB bandwidth: 0.2 – 3KHz typical
– sensitivity: 60mV p-p for full scale ADC readout

Dimensions: W 165mm x H 44mm x D 110mm

Weight: 1100g (2.4 lbs.)

DIGI KEYER front specs

  1. POWER:
    YELLOW color indicates when power is applied to the “Radio” connector.
  2. CW SPEED:
    WinKey speed control. Range (MIN, MAX) is defined by software
  3. CW:
    LED flashes with CW output
  4. Q-CW/P-FSK:
    LED flashes with Right channel Audio output when properly configured for ON/OFF Keying
  5. TX:
    Transmit Audio Level
  6. FSK:
    LED flashes with FSK output
  7. PTT:
    LED lights when PTT is active
  8. RX MAIN:
    Adjusts receive audio level from the main receive (left) channel.
  9. LINE:
    LED lights the sound card Line input is selected and flashes when the mic input is selected.
  10. SC:
    LED lights when an application opens the internal sound card for output.
  11. RX SUB:
    Adjusts receive audio level from the sub- receive (right) channel.
  12. SQL:
    LED light when SQUELCH is open (if supported by the transceiver)

DIGI KEYER back specs

  1. RADIO:
    DB15F connector for radio interconnection – a detailed description is in Appendix A
  2. MIC:
    3.5mm jack for microphone input from micro2R
  3. USB:
    USB B connector for computer connection. Connect the supplied USB A-B cable.
  4. SUB RX:
    3.5mm jack for connecting audio from a second receiver
  5. PS/2:
    MiniDIN6 for PS/2 keyboard, PS/2 numeric keypad, resistive Keypad, or Aux CI-V output.
  6. PTTIN:
    RCA for PTT Out (Amplifier PTT) from transceiver
  7. PA PTT:
    PTT output for Power Amplifier
  8. OUT:
    3.5mm jack for output to micro2R
  9. PADDLE:
    6.3mm (1/4″) stereo female for paddle input.
  10. FOOTSW:
    input for optional foot switch (manual PTT)
  11. LNA PTT:
    PTT output for controlling Low Noise Preamplifier or Receive antenna switching

Additional Radio Cables


DB15-EL-K2 1m long – For Elecraft’s transceivers: K2/100TBA
DB15-EL-K3 1m long – For Elecraft’s transceivers: K3TBA
DB15-IC-8 1m long – For Icom’s transceivers: 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-756/Pro/ProII, ProIII, IC-7600, IC-761, IC-765, IC-7700, IC-775, IC-781, IC-910$110.00
DB15-IC-13 1m long – For Icom’s transceivers: IC-703, IC-706, IC-706mkII, IC-706mkIIG, IC-718, IC-78, IC-7000, IC-7200, IC-7410, IC-9100$110.00
DB15-IC-7800 1m long – For Icom’s transceiver: IC-7800TBA
DB15-IC-RS8 1m long – For Icom’s transceivers: 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/ProII/ProIII, IC-7600, IC-761, IC-765, IC-775, IC-7700, IC-7800, IC-781, IC-910 with micro BAND DECODER or Piexx InterfaceTBA

select one of the brands below to view the full product list