I can't seem to figure out what the purpose of this is. It appears to me to be a USB sound card, at which point, as I understand it, you could use vox and be good to go. If this has an output of some sort for dedicated PTT it would seem to be more like a CM108, which combines the sound card and some I/O. What I don't understand is why not use a USB sound card and a CAT interface, then PTT, QSY, etc are all covered.
Hi Jon,
There is a HUGE difference between capabilities listed in a sales/marketing product description and detailed documentation (which would explain how to select those different modes of operation). Keep in mind that the usb2rig is sold without any documentation.
The PCB pictures linked by John, WB2OSZ shows a 3x3 solder pad with pcb-printing sufficient to explain its usage.
While the layout on the PCB differs from the digirig, the 3x3 solder pad is in fact the same as for the digirig version 1.9 (same 3 configuration options).
Also in common with the digirig are two separate 2-pad solder jumpers. The one labeled 3.3V is used to provide power for the isolation circuit of the TX500 from Lab599 (most people will not need that, but some may be confused about that solder pad and 3.3V versus 5V logic levels). The one labeled ATT provides audio input attenuation (20dB in the digirig).
As for PTT, the similarity with the digirig suggests that PTT is driven by RTS on the serial port. Some product descriptions I have seen for the usb2rig mention vox (without being clear whether they expect vox in the radio to be used or whether the usb2rig has an internal vox circuit).
There are no jumpers or solder pads to change behavior of PTT, suggesting that just like the real digirig it is firmly tied to RTS on the serial port.
73,
Thomas
KK6FPP
