I agree with you Jim. For years I've operated digital modes with a direct connection between the IN's and OUT's of the sound card to the radio. Using the VOX to control the T/R sequence {and any radio worth it's salt has a good VOX, although many don't} does the trick nicely.
Now, if you end up with humm or buzz that indicates that you have other issues that need to be addressed in your station. These are typically RFI or ground loops. Addition of transformers for isolation is a Band-Aid fix as the typical transformers have serious ringing when not correctly terminated. Also they are very prone to introduction of humm from power supply sources. With this approach, using available free software, one can record audio direct from the receiver and play it back direct to the transmitter to give other stations an idea of how their signal sounds at your QTH. I've done this many times to assist others in getting an idea of how their transmitter and audio path sounds on the air. 73 Bob, K4TAX ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html