<p dir="ltr">I totally agree... I had a Hamtronics 220 repeater and I did exactly that... </p>
<p dir="ltr">After the audio mods it sounded really nice. </p>
<p dir="ltr">Sam. </p>
<div class="gmail_quote">On Mar 8, 2014 11:43 AM, "Robert A. Poff WB3AWJ" <<a href="mailto:wb3awj@comcast.net">wb3awj@comcast.net</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><div style="font-size:12pt;font-family:Arial"><div><br></div><div>I would think that it should switch 100ma with no problem.<br></div><div>Make sure you put a diode across the relay coil (band toward + volts) to suppress back emf when the relay releases.<br>
</div><div><br></div><div>As to the Hamtronics exciter....<br></div><div><br></div><div>I had to use one (TA451) on a local club UHF repeater that I redid as an Allstar node. That repeater always had sounded horrible before.<br>
</div><div>And to no surprise, with the Allstar node it sounded absolutely RANCID. I needed to bypass all the mic processing and the really nasty clipper,<br></div><div>and inject the transmitter audio downstream just after the splatter filter, and essentially directly into the phase modulator. Through an isolation <br>
</div><div>resistor (somewhere around 4.7K if I remember correctly).<br></div><div><br></div><div>Now it sounds as smooth as my Mastr II / Allstar repeaters do.<br></div><div><br></div><hr><div style="font-size:12pt;font-style:normal;font-family:Helvetica,Arial,sans-serif;text-decoration:none;font-weight:normal">
<b>From: </b>"Bryan Fields" <<a href="mailto:Bryan@bryanfields.net" target="_blank">Bryan@bryanfields.net</a>><br><b>To: </b>"app rpt-users" <<a href="mailto:app_rpt-users@ohnosec.org" target="_blank">app_rpt-users@ohnosec.org</a>><br>
<b>Sent: </b>Friday, March 7, 2014 5:44:12 PM<br><b>Subject: </b>[App_rpt-users] RTCM PTT circuit<br><div><br></div>I'm interfacing the RTCM with a hamtronics exciter and will be using a small<br>relay to key it. <br>
<div><br></div>Can it sink 100 ma to ground for the relay or do I need a driver transistor?<br><div><br></div>-- <br>Bryan Fields<br><div><br></div><a href="tel:727-409-1194" value="+17274091194" target="_blank">727-409-1194</a> - Voice<br>
<a href="tel:727-214-2508" value="+17272142508" target="_blank">727-214-2508</a> - Fax<br><a href="http://bryanfields.net" target="_blank">http://bryanfields.net</a><br><div><br></div>_______________________________________________<br>
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