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<p>"The DAC problem is related to audio phase not launch delay. So
the audio will sound bad even with the proper launch delay."</p>
<p>I am just shooting from the hip on this, but would it be possible
to insert a preamble into the simulcast stream that the DAC's
would each reproduce and some additional circuitry or code could
monitor and use to correct the audio phase at each RTCM?</p>
<p>I am sure I am oversimplifying, but, thoughts?<br>
</p>
<p>Joe<br>
</p>
<br>
<div class="moz-cite-prefix">On 3/14/2017 10:33 AM, Tim Sawyer
wrote:<br>
</div>
<blockquote
cite="mid:CAG3ht9tQiQgy05TJTSNfYg1t4hxep0u587bmgG2UeLS6P-ZLnw@mail.gmail.com"
type="cite">
<div dir="ltr">The delta should be less than 83uS for voice is
what I read. Digital (i.e. P25) needs to be even less, not that
that's what your dealing with here. Of course the signal
strength comes into play as well. The overlap areas are defined
as areas where the signal is within 10dB.
<div><br>
</div>
<div>The Radio Mobile program can accept these figures and plot
the simulcast interference. It takes some doing to figure out
but well worth the effort. I've found it amazingly accurate. I
might have an example plot to share if anyone is interested. </div>
<div><br>
</div>
<div>The DAC problem is related to audio phase not launch delay.
So the audio will sound bad even with the proper launch delay.</div>
<div><br>
</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Mon, Mar 13, 2017 at 8:10 PM, Hayden
Honeywood <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:haydenph91@gmail.com" target="_blank">haydenph91@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">
<div class="gmail_extra">Thanks for your thoughts Jesse
and Tim.</div>
<div class="gmail_extra"><br>
</div>
<div class="gmail_extra">Ah, perhaps that was my issue, I
was setting the delay, doing a 99 to save to EEPROM but
not rebooting. Perhaps I need to try this next.
Basically the test you have described Jesse is what I am
doing at home. </div>
<div class="gmail_extra"><br>
</div>
<div class="gmail_extra">I believe from what I have read
and understand from Joe's messages, Tim that some error
in the launch delay is OK at voice. I read somewhere
over 110uS it starts to become a problem.</div>
<div class="gmail_extra"><br>
</div>
<div class="gmail_extra">I certainly can get away with no
PL encoding on the transmitter, I was merely using it as
a means of double checking my audio phasing. Voice
sounds OK, depending on my frequency offset. It does
have a level of distortion however - again maybe due to
the launch delay not being set correctly. I suppose a
semi bonus is that at 6 metres, normal propagation
effects cause noise, crackles, phase cancellations etc
so it may just all sound natural anyway. Sporadic E
openings will be interesting though :).</div>
<div class="gmail_extra"><br>
</div>
<div class="gmail_extra">Currently my main site has a
significant overlap of my planned secondary site. I may
need to reconsider this to reduce the overlap.</div>
<div class="gmail_extra"><br>
</div>
<div class="gmail_extra">73</div>
<span class="HOEnZb"><font color="#888888">
<div class="gmail_extra">Hayden</div>
</font></span></div>
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-- <br>
<div class="gmail_signature" data-smartmail="gmail_signature">
<div dir="ltr">
<div>
<div dir="ltr">
<div>--<br>
</div>
<div>Tim</div>
</div>
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<pre class="moz-signature" cols="72">--
Joe Leikhim
Leikhim and Associates
Communications Consultants
Oviedo, Florida
<a class="moz-txt-link-abbreviated" href="mailto:JLeikhim@Leikhim.com">JLeikhim@Leikhim.com</a>
407-982-0446
<a class="moz-txt-link-abbreviated" href="http://WWW.LEIKHIM.COM">WWW.LEIKHIM.COM</a></pre>
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