<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>if you use pins 21 and 22 on the URI,they are already AC Coupled based on examining the schematic on the dmk website. there are already 47pF caps in the circuit to decouple the source from the URI in/out feeds. <br><br>If you are taking discriminator RX audio, the dsp is more than capable of stripping not only the PL but also can determine and derive a pseudo-COS signal, eliminating 2 wires in the interconnect. In fact, if you use dsp to carrier (and/or ctcss) detect, i don't believe (jim?) that it even matters what the state of those two leads are.</div><div><br></div><div>so, minimal connections are needed: flat rx audio, flat tx audio, ptt, and ground to give you full control over the rf side of the house, assuming you have all the app configs set right. simple is good. but if you want to have active low, active high, pull up resistors, and all that, the URI will let you get as creative as you want, with the added complexity of wiring and config changes necessary to make it work.</div><div><br></div><div>simple is good, and ultimately, less trouble to debug.<br><div>--</div><div>Bryan</div>Sent from my iPad</div><div><br>On Oct 30, 2013, at 11:48 PM, Johnny Keeker <<a href="mailto:cypresstower@yahoo.com">cypresstower@yahoo.com</a>> wrote:<br><br></div><blockquote type="cite"><div><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><span style="RIGHT: auto">
<div style="MARGIN: 0in 0in 0pt" class="yiv5362844064MsoNormal"><font face="Verdana">I use the capacitor it good design practice to isolates the circuits </font></div>
<div style="MARGIN: 0in 0in 0pt" class="yiv5362844064MsoNormal"><font face="Verdana">although </font><font face="Verdana">it will not strip the pl or dpl.<span> </span>If I want to strip pl or dpl, </font></div>
<div style="BACKGROUND-COLOR: transparent; FONT-STYLE: normal; MARGIN: 0in 0in 0pt; FONT-FAMILY: Verdana; COLOR: rgb(0,0,0); FONT-SIZE: 16px" class="yiv5362844064MsoNormal"><font face="Verdana">use a Communication Specialists Board. You can try removes their </font></div>
<div style="BACKGROUND-COLOR: transparent; FONT-STYLE: normal; MARGIN: 0in 0in 0pt; FONT-FAMILY: Verdana; COLOR: rgb(0,0,0); FONT-SIZE: 16px" class="yiv5362844064MsoNormal"><font face="Verdana">audio cap and add jumpers.<span> </span>"Just kidding".<span> </span>Another consideration, </font></div>
<div style="BACKGROUND-COLOR: transparent; FONT-STYLE: normal; MARGIN: 0in 0in 0pt; FONT-FAMILY: Verdana; COLOR: rgb(0,0,0); FONT-SIZE: 16px" class="yiv5362844064MsoNormal"><font face="Verdana">take a look at, pin 16, connector P904, on the IF/Audio Squelch Board; </font></div>
<div style="BACKGROUND-COLOR: transparent; FONT-STYLE: normal; MARGIN: 0in 0in 0pt; FONT-FAMILY: Verdana; COLOR: rgb(0,0,0); FONT-SIZE: 16px" class="yiv5362844064MsoNormal"><font face="Verdana">RX PA. The audio is clean and de-emphasized. </font></div>
<div style="BACKGROUND-COLOR: transparent; FONT-STYLE: normal; MARGIN: 0in 0in 0pt; FONT-FAMILY: Verdana; COLOR: rgb(0,0,0); FONT-SIZE: 16px" class="yiv5362844064MsoNormal"><font face="Verdana">JK<var id="yiv5362844064yui-ie-cursor"></var><span> </span><span> </span><span> </span></font></div>
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<div style="BORDER-BOTTOM: #ccc 1px solid; BORDER-LEFT: #ccc 1px solid; PADDING-BOTTOM: 0px; LINE-HEIGHT: 0; MARGIN: 5px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; HEIGHT: 0px; FONT-SIZE: 0px; BORDER-TOP: #ccc 1px solid; BORDER-RIGHT: #ccc 1px solid; PADDING-TOP: 0px" class="hr" readonly="true" contenteditable="false"></div><font size="2" face="Arial"><b><span style="FONT-WEIGHT: bold">From:</span></b> Robert Newberry <<a href="mailto:N1XBM@amsat.org">N1XBM@amsat.org</a>><br><b><span style="FONT-WEIGHT: bold">To:</span></b> Johnny Keeker <<a href="mailto:cypresstower@yahoo.com">cypresstower@yahoo.com</a>> <br><b><span style="FONT-WEIGHT: bold">Sent:</span></b> Wednesday, October 30, 2013 8:08 PM<br><b><span style="FONT-WEIGHT: bold">Subject:</span></b> Re: [App_rpt-users] Resistor divider<br></font></div>
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<div>I just realized that the DSP should be able to strip PL off. At least I think it can.</div>
<div>Apparare Scientior <br>Paratus Communicare<br>-N1XBM</div>
<div class="yiv1446043287gmail_quote">On Oct 30, 2013 6:44 PM, "Johnny Keeker" <<a href="mailto:cypresstower@yahoo.com" rel="nofollow" target="_blank" ymailto="mailto:cypresstower@yahoo.com">cypresstower@yahoo.com</a>> wrote:<br>
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<div style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt"><span>
<div style="MARGIN: 0in 0in 0pt" class="yiv1446043287MsoNormal"><font face="Verdana">Robert;</font></div>
<div style="BACKGROUND-COLOR: transparent; FONT-STYLE: normal; MARGIN: 0in 0in 0pt; FONT-FAMILY: Verdana; FONT-SIZE: 16px" class="yiv1446043287MsoNormal"><font face="Verdana">You need to remove the sub audible tone when using vol hi, </font></div>
<div style="BACKGROUND-COLOR: transparent; FONT-STYLE: normal; MARGIN: 0in 0in 0pt; FONT-FAMILY: Verdana; FONT-SIZE: 16px" class="yiv1446043287MsoNormal"><font face="Verdana">but if your not concerned with hearing your ctcss tones,<span> </span></font></div>
<div style="BACKGROUND-COLOR: transparent; FONT-STYLE: normal; MARGIN: 0in 0in 0pt; FONT-FAMILY: Verdana; FONT-SIZE: 16px" class="yiv1446043287MsoNormal"><font face="Verdana"><span></span>use a 10uf cap off the vol hi through a series 10k to a 3.3k </font></div>
<div style="BACKGROUND-COLOR: transparent; FONT-STYLE: normal; MARGIN: 0in 0in 0pt; FONT-FAMILY: Verdana; FONT-SIZE: 16px" class="yiv1446043287MsoNormal"><font face="Verdana">to ground. Tap the audio where the 10k meets the 3.3k resistor.<span> </span></font></div>
<div style="BACKGROUND-COLOR: transparent; FONT-STYLE: normal; MARGIN: 0in 0in 0pt; FONT-FAMILY: Verdana; FONT-SIZE: 16px" class="yiv1446043287MsoNormal"><font face="Verdana"><span></span>Use a variable 5k pot in place of the 3.3k if you want to change </font></div>
<div style="MARGIN: 0in 0in 0pt" class="yiv1446043287MsoNormal"><font face="Verdana">the levels or just change the 3.3k value....<var></var> </font></div>
<div>JK<br></div></span></div>
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<div style="FONT-FAMILY: times new roman, new york, times, serif; FONT-SIZE: 12pt">
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<div style="BORDER-BOTTOM: #ccc 1px solid; BORDER-LEFT: #ccc 1px solid; PADDING-BOTTOM: 0px; LINE-HEIGHT: 0; MARGIN: 5px 0px; MIN-HEIGHT: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; FONT-SIZE: 0px; BORDER-TOP: #ccc 1px solid; BORDER-RIGHT: #ccc 1px solid; PADDING-TOP: 0px"></div><font face="Arial"><b><span style="FONT-WEIGHT: bold">From:</span></b> Robert Newberry <<a href="mailto:N1XBM@amsat.org" rel="nofollow" target="_blank" ymailto="mailto:N1XBM@amsat.org">N1XBM@amsat.org</a>><br><b><span style="FONT-WEIGHT: bold">To:</span></b> "<a href="mailto:app_rpt-users@ohnosec.org" rel="nofollow" target="_blank" ymailto="mailto:app_rpt-users@ohnosec.org">app_rpt-users@ohnosec.org</a>" <<a href="mailto:app_rpt-users@ohnosec.org" rel="nofollow" target="_blank" ymailto="mailto:app_rpt-users@ohnosec.org">app_rpt-users@ohnosec.org</a>> <br><b><span style="FONT-WEIGHT: bold">Sent:</span></b> Wednesday, October 30, 2013 12:45 PM<br><b><span style="FONT-WEIGHT:
bold">Subject:</span></b> [App_rpt-users] Resistor divider<br></font></div>
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<div>I need help, I am using a Mastr II and a URI. I want to use the vol/sql hi for my discriminator audio. I was going to use a resistor divider to pad down the audio. </div>
<div>Has anyone ever done this? Could you explain it in more detail to me. I've read you take the two resistors and put them in series. I would tap my URI in the middle where those two resistors meet. I assume one end goes to vol/sql hi, but where does the far end go?</div>
<div>Thanks for your help</div>
<div>Apparare Scientior <br>Paratus Communicare<br>-N1XBM</div></div><br>_______________________________________________<br>App_rpt-users mailing list<br><a href="mailto:App_rpt-users@ohnosec.org" rel="nofollow" target="_blank" ymailto="mailto:App_rpt-users@ohnosec.org">App_rpt-users@ohnosec.org</a><br><a href="http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users" rel="nofollow" target="_blank">http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users</a><br><br><br></div></div></div></div></blockquote></div></div><br><br></div></div></div></span></div></div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span>App_rpt-users mailing list</span><br><span><a href="mailto:App_rpt-users@ohnosec.org">App_rpt-users@ohnosec.org</a></span><br><span><a href="http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users">http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users</a></span><br></div></blockquote></body></html>