MICROHAM USB INTERFACE III
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Description
The Microham USB interface III is a low cost, high performance USB interface that provides high quality build-in sound card for digital modes, with optically isolated transceiver CAT control, CW and PTT. These USB Interfaces provide a solution to the lack of available Serial (COM) ports on laptop and newer desktop computers for controlling your radio.
The Microham USB interface III includes full optical isolation of all control signals (radio control, CW, PTT and Squelch) and built-in USB sound card with front panel level controls for transmit via your transceiver's Accessory audio input and the constant level (pre-volume control) audio output.
Microham USB Interfaces have built-in hardware support for your radio - you no longer need additional level converters like CT-62, IF-232, FIF-232, CT-17. USB Interface III includes support for CW keying (DTR) and PTT (RTS) as well as a detector/driver for pseudo-FSK and QSK CW on the soundcard's right audio channel for use with FLDIGI on any platform. USB Interface III uses same cable as USB Interface II or DIGI KEYER.
The interface is suitable for connecting any type of transceiver that has a CAT port. For example, Yaesu, Kenwood, Icom, Elecraft, Ten-Tec.
MicroHAM USB Interface III box contains: device, USB A/B cable, clip on ferrit rfi filter
The device is compatible with a wide range of radios, so you need to create a radio-specific cable, it is not supplied in the box. Cabling and device setup can be downloaded here: http://www.microham.com/contents/en-us/d137.html
Driver software and user manual can be downloaded here: http://www.microham.com/contents/en-us/d29_downloads.html
Microham USB interface III block diagram:
Microham USB interface III features:
Microham USB interface III specifications:
| Power Consumption | USB < 200mA, Transceiver, < 100mA @ 13.8V. |
| Radio Port | RxD, TxD, max. 57600 Baud |
| Levels | jumper selectable TTL, inverted TTL, open collector bus or RS-232 |
| CW | open collector, driven from DTR or audio detector, max 30V/400mA |
| PTT | open collector, driven from RTS, max 30V/400mA |
| FSK | open collector, driven from DTR (MMTTY with EXTFSK) or audio detector (FLDIGI/pseudo-FSK) |
| SQL | input, closed to ground or high (two inputs) to activate. Wired to CTS |
| Audio Out (left) | |
| Output Level | 1.3V p-p max. |
| Response | 100 Hz - 10 KHz +1dB/-3dB |
| Second Harmonic | -80 dB (typical) |
| Third Harmonic | -70 dB (typical) |
| D/A Sample rates | 32000, 44100, 48000 Hz |
| Audio Out (right) | Internal Pseudo-FSK/QSK CW detector.Drives CW and FSK outputs |
| Audio In (left) | |
| Input Level | 4V p-p max. |
| Response | 300 Hz - 3 KHz +/- .5 dB (typical) |
| Absolute Noise Floor | -90 dB @ 600 Ohms |
| Dynamic Range | 87 dB (typical) |
| D/A Sample rates | 8000, 11025, 16000, 22050, 32000, 44100, 48000 Hz |
| Dimensions | W 103mm (4 1/8") x H 28mm (1 1/8") x D 101mm (4") |
| Weight | 1100 g (2.4 lbs.) |
| Requirements | |
| Minimum | 800 MHz IBM PC compatible computer with Windows 2000, 64 MB RAM, CD-ROM, USB1.1 port, Transceiver, logger or control software (any) |
| Recommended | 1.6 GHz PC with Windows XP or higher, 256MB RAM, CD-ROM, USB2.0 port, Transceiver with computer port, logger or control software (any) |
| Also Supported | Apple G4 or later with OS X 10.4 or later and current LINUX distributions. |
| Note | Windows 98 (any version) is not supported |
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