On Sat, Jun 8, 2019 at 12:56 PM Don Goodrich don.goodrich@cheerful.com wrote:
Certainly the computer volume control has no influence but since the data is being communicated to/from the radio over the external radio audio port, the radio volume control needs to be set midrange for the cable to "hear" the outbound data.
Don Goodrich don.goodrich@Cheerful.com AF7DG
The digital data is proviced on connections that have nothing to do with the connections for the analog speaker audio or the analog microphone audio. In addition to the audio wires (that aren't included in the programming cable since they are not necessary to have for programming) and the data wires, there is even a connection that provides DC voltage (5V or 3.3V depending on the radio) to power external devices.
http://www.miklor.com/COM/UV_Technical.php#spkrmic
Jim KC9HI