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  • #3295

    I apologize if this has been asked before, but is it possible to use a sound interface like the RA-35 from Masters Communications to connect the transmitter and receiver to the RPi? I am using one for another pi based project for audio in and out, COS, and PTT all via a single USB connection and would like to do something similar with this build. If not, I’ll work on making the connections necessary to access the GPIO pins.

    Thank you!


    Aaron, N3MBH
    Forum Administrator

    Hello Matt,


    It appears the RA-35 from Masters Communications is a similar device to a DMK Engineering URI or a USB RIM Lite using a modified sound codec to extend it’s GPIO pins. Is that correct?

    If so there has been some development progress made in the 2.2.x backend code to support this. I don’t have plans to roll it out until the 3.0 redesign is completed as I need to have UI elements to allow configuration to the average user. But initial testing has been positive.

    So far I have only tested this with the DMK Engineering URI and USB RIM Lite but other CM108/CM119 devices should work. On the SVXLink side the support for this only handles a couple pins and they refer to them as Hidraw devices.

    COS Pins Supported:

    PTT Pins Supported:
    GPIO1, GPIO2, GPIO3 or GPIO4

    I’d have to verify that the pins on CM119A chip for the RA-35 schematic match up to the expected functions pins supported above. If so than support for the RA-35 should be possible in a future release, unless you’d like to try the development code with some guidance.

    Aaron – N3MBH / WRFV871

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