microHAM micro KEYER III Digital Mode and Radio Control Interface

The microHAM micro KEYER III Digital Mode and Radio Control Interface is the world’s first USB interface to feature high dynamic range, 24-bit audio processing for all modes and is the most powerful all-in-one USB interface, the only one to support digital, voice and microphone switching in one box and features two separate channels supporting transceivers with two audio outputs (main and sub receivers). 

The microHAM micro KEYER III works with most Windows, Mac and Linux-based logging and transceiver control applications for CW, Voice, FSK and Digital Modes and includes a CAT radio control interface that supports standards like RS-232, CI-V, Kenwood and Yaesu TTL. A powerful CW memory keyer using K1EL's WinKey, a digital voice Keyer for SSB, two-channel audio processing for transceivers with dual receivers, automatic microphone selection and a buffer/sequencer for amplifier or LNA control are all features included in the micro KEYER III.

The built-in 24 bit USB sound card offers a variety of benefits such as improved signal-noise ratio, greater dynamic range (>105dB), lower noise floor and improved weak signal decoding compared to standard 16-bit audio interfaces, USB enabled transceivers or even the micro KEYER II, the predecessor to the micro KEYER III. The use of an external USB radio control interface leaves the computer's sound card free to perform its duties for the operating system like system sounds or video and bypasses the onboard 16-bit USB audio limitation of the computer.

Connection to a computer only requires one USB cable and the connection to a transceiver requires a transceiver-specific DB37 cable (sold separately). 

Note: Linux-based programs require the use of DJ5QV’s mhuxd Router application.

Items Included

• micro KEYER III

• 6.5 ft. (2M) USB A/B Cable

• RJ-45–Foster 9 Male Microphone Adapter 

micro KEYER III Additional Features

- Computer Free Operation (Keyer, Sequencer etc.)

- Full Galvanic Isolation of All Devices (Computer, Radio, Amplifier etc.)

- Asynchronous Data Transfer by USB

- Does Not Require Special Drivers (Standard USB Audio Class Device)

- Internal Oscillator with Low Phase Noise -145dBc/Hz @1kHz

- Large Dynamic Range: 110 dB typical, (105 dB Min.)

- Separate and Simultaneous Useable USB Audio Inputs for Line-In and Microphone

- Low Noise Floor: Less Than 10 µV peak-to-peak eff

- Additional Optical S/PDIF Input and Output

- iLink Connection for Integration with Other microHAM Devices

- Real-time Control On Built-in OLED Display

- Silent Switching of All Signals Without Relays

- Digital Signal Processing of All Analog Signals, Including Microphone Inputs

- 1 Watt AF Amplifier for Monitor and Side-tone

- Configurable Blue Back-lit Two Row LCD Display

- OLED Display for Various Settings, Tuning Display and More

- Sequencer for LNA, PTT via OptoMOS Switch Without Relays

- Separate Power Supply with Protection Circuit

- Separate On/Off Switch

- Additional CI-V CAT Connection for Operation of a Suitable Amplifier or Other Devices

- Additional Serial Port (iLink) for Integration of Other Devices, Like SteppIR or Ultrabeam Antenna Controllers, or Tuners

- Works With FH-1/FH-2 Keypad for Keyer Memory Recall

- Backward Compatible: Uses the Same DB-37 Cable As The Original micro KEYER

CAT Control

- Two Independent CAT Ports for Use by Two Independent Applications (Logger, DigiMode-SW)

- Baud Rate up to 57k, Including Handshake Control

- Built-in Level Converters for CI-V, FIF-232, IF-232 or RS-232

- CAT Control Support for Most Manufacturers Like Elecraft, Icom, Kenwood, Ten-Tec, Yaesu and Others

- Tracking of An SDR Receiver Operated in Parallel (Kenwood or Icom Protocol)

Phone Features

- Connect Two Microphones (Headset, Handheld Mic)

- Manual or Automated Microphone Selection

- All Settings are Manageable Through the Menu, No Jumpers to Set

- Set Individual Parameters Like Gain, Bias Voltage, Emphasis, ALC for Electret and Dynamic Microphones

- Monitor For Transmit Audio, e.g. For Recording the Contest Signal or Documentation of DX

- Digital Voice Recorder/Keyer with 9 Tracks Per Bank, Each Up to 120s Duration with Unlimited Banks

Digital FSK/AFSK/PSK Features

- Low Distortion by Using 24-bit AD Conversion with High Dynamic Range

- Two Audio Channels for Two Separate Receivers

- Low Noise Floor 

- Transmit/Receive Switch on MK-III Front Panel

- Separate PTT Output for Digital Modes to Mute Microphone Input

- Highly Reactive RTTY Tuning Scope with Crossed Ellipses

- FSK Keying Without Jitter is Supported by Real Hardware UART

- Precision Sampling for True 45.45 Baud at RTTY

- Continuous Diddle Characters Without Stutter

- Word Length of 5/6/7/8 Bit Length, with 1/1.5/2 Stop Bits

- Precise Sampling for Audio Based P-FSK Keying

CW Morse Code

- Genuine v3 WinKey™ Chip for Precise Keying

- Front Panel Key Speed Control

- Paddle Connection with De-Bounced Contacts

- Optical Display of Keying Speed

- Sidetone for Paddle Keying

- Monitor for Transmitted Telegraphy Signal, e.g., for Recoding During a Contest

- Automated use of Serial Contest Numbers

- Memory Keyer with Optional PS/2 Keyboard

Specifications

• USB: 2.0 Full speed, Isolated

• FTDI USB: Serial

• UAC1 Asynchronous Downstream, Max. 24-bit/48kHz, Asynchronous/Synchronous Upstream, Max. 24-bit/96kHz

Power consumption:

• USB - Less Than 10mA

• Power Supply – 450mA @ 13.8 VDC (Maximum 16 VDC)

Radio Port:

• RxD, TxD - 57600 Baud, RTS/CTS Handshake Supported

• Levels: FIF-232, IF-232, CI-V, RS-232

• Aux Port: TTL – RxD, TxD, No Handshake – Maximum 19200 Baud

• CI-V Port: Open Collector Bus - 19200 Baud 

CW/FSK/PTT1/PTT2:

• Open Collector, Maximum 30V/400mA

PA PTT, LNA PTT:

• OptoMOS: 300 VAC/VDC @ 0.1A

Foot Switch, PTTIN:

• Active When Closed to Ground, Maximum Load: 1 mA at 5V

Monitor:

• Mono, 1 Watt @ 4 Ohm Speaker

Audio Line Output:

• 600 Ohm, Maximum 1.5V peak-to-peak

• A/C Coupled

Audio Mic Output:

• 600 Ohm, Maximum 370mV peak-to-peak

• A/C Coupled

Audio Line Input:

• 10K Ohm, 5V p-p

• Dual Channel (Stereo)

Dynamic Range:

• Min. 105 dBA, typical 110 dBA

• THD: 0.0009%

• IMD + Noise: 0.004%

• A/C Coupled

Dimensions:

• W 9.134 in. (232mm) x H 1.732 in. (44mm) x D 4.139 in. (105mm) 

Weight:

• 2.87 lbs. (1.3 kg)