USB CAT and AUDIO Mode
The provided USB CAT functions (Computer Aided Tuning) in combination with the
integrated USB Audio Interface enable you to:
• Use standard HAM software to control many aspects of the receiver (tuning,
modes, PTT). This is enabled by an emulated serial COM port using the well-
documented protocol of Yaseu FT-817 receivers.
• Streaming of the mcHF audio to your PC by use of a virtual microphone interface
via USB. You can use this with any audio recording software or HAM software
accepting soundcard input.
• Transmitting audio from the PC via USB to the mcHF. Use with any soundcard
compatible HAM software or audio tools.
• Use the mcHF as SDR RF frontend for SDR software such as HDSDR, SDR# and
others accepting sound card in- and output. That means you not only can receive
IQ data but also transmit (e.g. with HDSDR). Bandwidth is limited by the A/D
conversion and sample rate in the mcHF (which is 48khz/16bits per sample).
All of this requires just a single USB cable which is plugged into the Mini-USB port of the
mcHF.
Provided functionalities
• USB Audio In (RX, 48kHz sample rate, both channels have same signal), default
signal except in DIQ (Digital IQ) mode on mcHF
• USB IQ In (RX, 48kHz sample rate, left channel is I, right is Q), DIQ (Digital IQ)
mode on mcHF required
• USB Audio Out (TX, 48kHz sample rate, left channel is used), DIG (Digital Audio)
mode on mcHF required
• USB IQ Out (TX, 48kHz sample rate, left channel is I, right is Q), DIQ (Digital IQ)
mode on mcHF required
• CAT control via FT-817 protocol using the virtual COM port, baud rate setting is
ignored, any baud rate will work.
• USB CW Key control via DTR of virtual COM Port (DTR == 0 -> no carrier, DTR ==
1 -> CW carrier, requires use of PTT via CAT), can be used in parallel to a
connected CW keyer
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