Why is there a local microphone input?
This feature has its roots in our earliest development models. We used a DTMF microphone as the “test receiver” for a quick and easy test set-up. This feature found its way into the finished design for no other reason than “it was there”. We added a PTT and audio output which allow the local microphone port to function as a 5th T/R port, if desired. Even though they make relatively few trips to their site, many users enjoy having the convenience of a local microphone when they are working on their system.
