<-- Hi Tim: Unless you can find raw discriminator audio as your RX audio (and hence use DSP for presence of signal / ctcss decoding, etc.,) you will need a COS signal (that tracks PL) along with de-emphasized / speaker audio.I am setting up my first AllStar Link node.. I will be using a Raspberry Pi3, the URIx USB Radio Interface and an old Yaesu handheld HT. With this configuration, do you think its necessary to connect the COS line from inside the HT to the URIx ? or can I live reasonably well without it? I'd appreciate any inputs on this. Thanks.