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<p>any more progress on this?<br>
</p>
<br>
<div class="moz-cite-prefix">On 3/14/2017 1:54 PM, Joe Leikhim
wrote:<br>
</div>
<blockquote
cite="mid:405b5b4c-3e27-561e-d55a-820ee082a5ab@leikhim.com"
type="cite">
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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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<div>--<br>
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<div>Tim</div>
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Joe Leikhim
Leikhim and Associates
Communications Consultants
Oviedo, Florida
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