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microHAM USB Interface II


microHAM USB Interface II

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About microHAM USB Interface II

The new USB-II interface by microHAM is an enhancement to the popular USB-interface.

This interface offers the usual level converters for nearly all CAT interfaces, electrically isolated lines for PTT and CW keying, an input for a squelch signal and electrically isolated audio interfaces. This makes this device ideally suited for all users who wants to run digital modes from the soundcard.

The microHAM USB-II device works with all computers with USB interface, drivers are available for Windows 98SE/ME/2000/XP, Apple Macintosh OS8/OS9/OS-X and Linux. MS-DOS is not supported.

Unlike common computer mass market "USB to Serial adapters" our USB Interfaces are carefully designed for maximum immunity from strong RFI and at the same time be "RF quiet". Each data line is low pass filtered for minimum interference. The only known product of USB chipset clock is a beat at 144.030MHz.


  • 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)
  • SQL input: close to ground or high (two inputs) to activate. Wired to CTS
  • Size: L-100 mm x H-25 mm x D-80 mm
  • Weight: 220g (without cables)


We aim to dispatch all parcels within 24hrs. We are normally able to dispatch parcels SAME DAY where orders are received before 2.00pm Monday to Friday.


Whilst we try our best to ship same day, we cannot guarantee delivery time. You will however receive tracking details as soon as your order has been processed.


Please note that we do not process orders over the weekend, so orders placed after 2pm on Friday will not ship until Monday.


Please allow an extra processing day for international orders to enable us to complete export/import custom clearance declarations.

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