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Hi John,<br>
<br>
"Is this thing on?" Thats the stupid mistake I made, I think. I
went back and tried VAC again, selecting speakers at the output. It
worked. The bone-headed thing I probably did was not raise the
volume when I first tried it. So now I have audio on the computer
speakers, which are much better quality than the dinky one I have
plugged in the radio. <br>
<br>
There is a definite delay, but its slight enough that I have
trouble working out where is has the greater delay.<br>
I think I'll leave it on the PC speakers until I can get a better
one for the direct connection.<br>
<br>
73, Andy - KF5JLJ<br>
<br>
<div class="moz-cite-prefix">On 10/11/2014 10:15 PM, John Laur
wrote:<br>
</div>
<blockquote
cite="mid:CAE653vXMhnwG5iSScc=Cqhr0K-DW752UqTBqOs7-H1O4=a4rZQ@mail.gmail.com"
type="cite">
<div dir="ltr">Hello, Andy
<div><br>
</div>
<div>You do not actually need VAC installed to get audio to play
to the PC speakers. Simply select the PC sound card as the
output in PowerSDR's VAC setup screen. </div>
<div><br>
</div>
<div>PowerSDR's "VAC" feature and the "Virtual Audio Cable"
software are completely separate and independent things though
they are complimentary when used to route audio to other
applications such as digital modes programs like fledge.</div>
<div><br>
</div>
<div>However, if you are able to use the radio's native audio
input and output I would encourage you to do so. There are a
number of advantages including offering lower latency and no
danger of buffer overrun/underrun.</div>
<div><br>
</div>
<div>My understanding of this is somewhat limited, and not to go
too far off topic, but for anyone who did not know this, the
actual reason that audio goes back to the radio is because the
audio interface is clock-locked to the master 122.88MHz
oscillator used for the ADC/DAC.Therefore there is never any
clock skew between the incoming/outgoing IQ data and the
incoming/outgoing audio. Because of this, the hardware and
software can use small, fixed buffers and do not have to worry
about the complexity of matching the different clock domains
(and the associated problems that would entail) Though I do
understand there is some effort being made to address the
issue of buffer underflow/undreflow in the VAC interface right
now which will be a very welcome change!</div>
<div><br>
</div>
<div>73, John KF5SAB</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Sun, Oct 12, 2014 at 2:44 AM, Andrew
Howell <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:andy@gamubaru.com" target="_blank">andy@gamubaru.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="">***** High Performance Software Defined Radio
Discussion List *****<br>
<br>
</span>
Steve, George and Tim,<br>
<br>
Thanks. I've got VAC installed, but still no audio. I can
route the received audio into FLdigi and MixW2 just fine.
But directing the output (playback) to the speakers does not
work. I'm kind of surprised that PowerSDR doesn't have this
all built in.<br>
<br>
Going to the windows control panel I can test the speakers.
They work fine. Any ideas?<br>
<br>
Andy KF5JLJ
<div class="HOEnZb">
<div class="h5"><br>
<br>
On 10/11/2014 7:19 AM, AD0ES wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
***** High Performance Software Defined Radio
Discussion List *****<br>
<br>
This is a very detailed description of VAC setup:<br>
<br>
<a moz-do-not-send="true"
href="http://kc.flex-radio.com/KnowledgebaseArticle50230.aspx"
target="_blank">http://kc.flex-radio.com/KnowledgebaseArticle50230.aspx</a><br>
<br>
Steve AD0ES<br>
<br>
On Oct 11, 2014, at 6:21 AM, George Byrkit wrote:<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
***** High Performance Software Defined Radio
Discussion List *****<br>
There is, I think, a path within PowerSDR that would
use VAC or its equivalent to pipe the<br>
received audio around within Windows, but that's
'advanced' configuration that I've not<br>
done myself.<br>
</blockquote>
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