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96.00 EUR (80.00 EUR + VAT)
Availability: On stock
Average Rating: Not Rated
Manufacturer: Microham


MicroHAM USB Interface II includes full optical isolation of all control signals (radio control, CW, PTT and Squelch) and high quality audio isolation transformers with level trimmers (screwdriver adjust) to permit connecting a computer sound card to your radio's rear panel audio input and constant level audio output for use with digital mode software or echolink. 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.  The drivers include support for software CW keying (DTR) and PTT (RTS) - there is no need for additional keying interfaces.

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 II 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. If necessary, we can manufacture these cables and you can ask for our unique quotation! Cabling and device setup can be downloaded here: http://www.microham.com/contents/en-us/d137.html

You can check the MicroHAM USB Interface II front panel layout and back panel connenctors by clicking here!

Driver software and user manual can be downloaded here: http://www.microham.com/contents/en-us/d29_downloads.html

MicroHAM USB Interface II block diagram:

MicroHAM USB Interface II features:

No COM or LPT port necessary, just one USB port and sound card

Complete "Computer <-> Radio" electrical isolation
- bidirectional transformer isolation of sound card and rig
- optical isolation of ALL digital signals -> Radio Control, CW, 2xPTT, FSK, PA from USB port

Integrated computer control port for all radios CI-V, FIF-232, IF-232, RS-232
- fully supported Icom, Kenwood, Ten Tec, Yaesu and other radios
- no separate level converter required
- based on FTDI chip

Squelch input for signaling to computer
- two inputs, on is activated when is closed to ground, second when senses 5-8V power 

No external power adapter
- Computer part is powered from USB
- Radio part is powered from transceiver or transceiver power supply

Strong RFI immunity 
- integrated chokes and filters for best RFI immunity
- advanced shielding and circuit design for RFI product suppression

Quick change connectors
- USB, Sound Card - 2 x 3.5mm (1/8")
- Radio - DB15

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

MicroHAM USB Interface II specifications:


USB USB 2.0 Full speed , USB 1.1 compatible
Radio Port 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)
SQL input, close to ground or high (two inputs) to activate. Wired to CTS
Dimensions W 60mm (2.4") x H 25mm (1") x D 80mm (3.2")
Weight 500 g


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