<div dir="ltr">Mine would not program without the volume control turned up.</div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Aug 23, 2016 at 6:14 AM, Jim Unroe <span dir="ltr"><<a href="mailto:rock.unroe@gmail.com" target="_blank">rock.unroe@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">On Mon, Aug 22, 2016 at 11:30 PM, Frederick R. McDougall<br>
<<a href="mailto:frmcdo@gmail.com">frmcdo@gmail.com</a>> wrote:<br>
> On my uv5rc unit the volume control does control the volume of the<br>
> speaker/mic.<br>
<br>
</span>As it should. The volume control controls the level of audio to the<br>
internal speaker and to a external speaker properly connect to the<br>
audio out lines.<br>
<span class=""><br>
> Thus it would also control the amplitude of the radio to<br>
> computer signal while reading the radio.<br>
<br>
</span>Incorrect. As I mentioned earlier, the radio communicates with the<br>
computer via a TTL level serial communication (+3.3 volts/0 volts).<br>
There is no speaker out or mic in audio involved. There aren't even<br>
any wires connected to the audio out or mic in because they are not<br>
needed or used for serial communications.<br>
<br>
It is not AFSK (audio frequency shift keying) like over-the-air<br>
digital communications. That would be an added complexity that isn't<br>
required.<br>
<br>
Jim KC9HI<br>
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