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<div dir="ltr"><font style="" face="Tahoma">OK Perhaps I am not using the right Allstar terminology here. My understanding is that simple USB works similar to IRLP in that you use pre/dempahsized audio and COS and there is no further processing. CTSS tones, squelch, etc. are not decoded by the SW but rather by the incoming DC level of COS.<br><br>On the other hand in what I call DSP the CTSS, etc. are decoded by the software. As a for instance the GM300 example on the DMK site uses no COS just audio in, out, and PTT. When using this mode you use flat audio from the RX or audio that has not been demphasized. <br><br>DSP is digital signal processing. That is what the SW does to look at the incoming signal to decode things like CTSS, DTMF, squelch noise etc. I am assuming that simple USB just uses the COS signal to detect carrier. My question was why would one prefer one method over the other or does one work better than the other. <br id="ecxFontBreak"></font><br><b><font style="font-size:16pt;" size="4">73 Doug</font><font style="font-size:16pt;" size="4"><br></font><font style="font-size:16pt;" size="4">WA3DSP</font><font style="font-size:16pt;" size="4"><br></font><font style="font-size:16pt;" size="4">http://www.crompton.com/hamradio</font></b><font style="font-size:16pt;" size="4"><br></font><br><br><div><hr id="ecxstopSpelling">From: kj6ko@innercite.com<br>To: doug@crompton.com<br>Subject: Re: [App_rpt-users] DMK URI questions<br>Date: Sat, 2 Nov 2013 00:13:15 -0700<br><br>
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<div><font face="Arial" size="2">Doesn't matter. It's a preference
thing. By the time audio gets to the internet, it is all digitized and
de-emphasized. What comes out the other end depends on what you
want. If you are going to feed a modulator directly, you need
pre-emphasized audio, and I don't think the URI will do that. It will
de-emphasize DISC audio on RX. You should just use MIC audio into the
radio and de-emphasized audio into the URI to keep it simple. I would
ALWAYS use "CTCSS Valid" signal out of the radio (if avail) and feed the
signal to the COS port of the URI.</font></div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2">COS and CTCSS are meant to be used together, like
in a repeater, but it doesn't have to be</font></div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2">MIC DC and MIC AC?? you will have to read the
radio manual on that one.</font></div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2">PS: DSP does NOT mean FLAT Audio. It
means "Digital Signal Processing" and really has nothing to do with audio
shape.</font></div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2">I guess I'm not sure what you mean by "DSP vs
Simple USB"?? Is there a device called a "DSP?" </font></div>
<div><font face="Arial" size="2"></font> </div>
<div><font face="Arial" size="2">I'm guessing you should keep it simple and use the
"Simple USB" because that is what it is...simple! Not much involved, Audio
in, audio out, PTT Out and COR/CTCSS in.(Either or). For a CTCSS detect,
you need to find something that will give a GND or +5VDC when an active PL Tone
is received. I think the DMK device can do this for you if you don't
have one on your radio, in which case you will HAVE to use discriminator audio
for RX. The DMK will de-emphasize it before it goes out over the
network. </font></div>
<blockquote style="BORDER-LEFT:#000000 2px solid;PADDING-LEFT:5px;PADDING-RIGHT:0px;MARGIN-LEFT:5px;MARGIN-RIGHT:0px;">
<div style="FONT:10pt arial;">----- Original Message ----- </div>
<div style="FONT:10pt arial;BACKGROUND:#e4e4e4;"><b>From:</b>
<a title="" href="mailto:doug@crompton.com">Doug Crompton</a>
</div>
<div style="FONT:10pt arial;"><b>To:</b> <a title="" href="mailto:app_rpt-users@ohnosec.org">app_rpt-users@ohnosec.org</a> </div>
<div style="FONT:10pt arial;"><b>Sent:</b> Friday, November 01, 2013 10:53
PM</div>
<div style="FONT:10pt arial;"><b>Subject:</b> [App_rpt-users] DMK URI
questions</div>
<div><br></div>
<div dir="ltr"><font face="Tahoma">About a week ago I asked about DMK URI
connections to an Alinco radio and I got several responses. I do have a few
more questions regarding that. <br><br>The Alinco has both flat and
pre/de-emphasized audio available on its data connector as 1200 baud and 9600
baud connections.<br><br>I assume I would use the 1200 baud connections along
with COS and PTT for a simple USB interface and the 9600 baud connections
along with just the PTT for a DSP interface?<br><br>Do I use the (Alinco
9600 baud) audio to the TX also? Does the DSP pre-emphasize audio or is the
processing just on the receive side?<br><br>Why would I want to use one over
the other (DSP vs simple USB)? Which is preferred and/or works better? I am
thinking there might be some differing opinions here!<br><br>The DMK URI has
both mic_DC and mic_AC inputs. Does this refer to frequency response or just
that one has DC blocking?<br><br>If you are using flat response (DSP) would
the audio in (from the receiver) connections at the URI end matter?<br><br>The
DMK URI has both COS and CTSS inputs. Why would you use one over the other?
When using DSP I assume neither is needed?</font><br><br><font face="Tahoma">All
of the questions above assume I am using the Acid release on a faster
processor.</font><br><br><b><font style="FONT-SIZE:16pt;" size="4">73
Doug</font><font style="FONT-SIZE:16pt;" size="4"><br></font><font style="FONT-SIZE:16pt;" size="4">WA3DSP</font><font style="FONT-SIZE:16pt;" size="4"><br></font><font style="FONT-SIZE:16pt;" size="4">http://www.crompton.com/hamradio</font></b><font style="FONT-SIZE:16pt;" size="4"><br></font></div><br><br>__________ Information
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