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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Thanks Doug. I guess I need to understand COS a bit more. It appears that COS is a digital low or high (0V or +5V). I did find AF mute on a 16 pin DIP at pin12, so I guess I need
to probe it with my logic probe while listening to squelch open and closed on a received signal.
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<div>I don't have a scope but I think my logic probe will give me enough info. I wonder if I have to buffer that signal if I try to use it as a COS line for the URI, if the URI loads that signal down too much, or if I can just take the signal right off that
pin. I suspect no buffer would be needed.</div>
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<div>Time to look at the URI schematic too...</div>
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<div>Thanks.<br>
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<div style="font-family:Tahoma; font-size:13px">Joe Lauricella, AD2DX</div>
<div style="font-family:Tahoma; font-size:13px">joe at AD2DX dot US</div>
<div style="font-family:Tahoma; font-size:13px">609-737-7064</div>
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<div id="divRpF824175" style="direction: ltr;"><font face="Tahoma" size="2" color="#000000"><b>From:</b> arm-allstar-bounces@hamvoip.org [arm-allstar-bounces@hamvoip.org] on behalf of Doug Crompton [doug@crompton.com]<br>
<b>Sent:</b> Friday, March 27, 2015 11:20 PM<br>
<b>To:</b> BeagleBone Black ARM Allstar<br>
<b>Subject:</b> Re: [arm-allstar] FT-2900R COS Signal<br>
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<div dir="ltr"><font color="#000000" face="Tahoma,sans-serif" style="">Joe,<br>
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Check out the service manual - <br>
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<a href="http://elektrotanya.com/yaesu_ft-2900r_sm.pdf/download.html" target="_blank">http://elektrotanya.com/yaesu_ft-2900r_sm.pdf/download.html</a><br>
<br>
main unit schematic. It looks like AF mute is a place to look. You will need to check levels with a signal. It is best to have a low (0 volt) signal on PL receive.<br id="FontBreak">
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<b><font size="4" style="font-size:16pt">73 Doug</font><font size="4" style="font-size:16pt"><br>
</font><font size="4" style="font-size:16pt">WA3DSP</font><font size="4" style="font-size:16pt"><br>
</font><font size="4" style="font-size:16pt">http://www.crompton.com/hamradio</font></b><font size="4" style="font-size:16pt"><br>
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From: joe@ad2dx.us<br>
To: arm-allstar@hamvoip.org<br>
Date: Fri, 27 Mar 2015 21:52:25 +0000<br>
Subject: [arm-allstar] FT-2900R COS Signal<br>
<br>
Hi Folks,
<div>Does anyone know where I can find the COS signal inside the Yaesu FT-2900R? I can get TX/RX audio, PTT and ground from the outside of the unit but I poured through the schematics and cannot locate COS.</div>
<div>Thanks in advance.<br>
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<div>73</div>
<div>Joe - AD2DX</div>
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