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<body class='hmmessage'><div dir='ltr'><font style="" color="#000000" face="Tahoma,sans-serif">OK great. You probably could avoid using the relay as the COS into the URI is a fairly high impedance. All you need is a point that goes low - close to 0 volts - on PL signal. The relay was probably used to key a PTT circuit and it was an easy way to isolate things.<br id="FontBreak"></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="stopSpelling">Date: Mon, 30 Mar 2015 09:21:42 -0400<br>From: N1XBM@amsat.org<br>To: arm-allstar@hamvoip.org<br>Subject: Re: [arm-allstar] Simplex node<br><br><p dir="ltr">So I found a midland document for converting one of their radios for repeater service. It basically involves using a point in the radio that follows valid PL a few reistors, diode, FET, and a relay. This will provide a solid contact to ground for COS. </p>
<p dir="ltr">That should be good enough. I hope!</p>
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