<html><body><div style="font-family: Arial; font-size: 12pt; color: #000000"><div aria-label="Compose body"><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 id="zwchr"><div style="color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;" data-mce-style="color: #000; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;"><b>From: </b>"Bryan Fields" <Bryan@bryanfields.net><br><b>To: </b>"app rpt-users" <app_rpt-users@ohnosec.org><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>727-409-1194 - Voice<br>727-214-2508 - Fax<br>http://bryanfields.net<br><div><br></div>_______________________________________________<br>App_rpt-users mailing list<br>App_rpt-users@ohnosec.org<br>http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users<br><div><br></div>To unsubscribe from this list please visit http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users and scroll down to the bottom of the page. Enter your email address and press the "Unsubscribe or edit options button"<br>You do not need a password to unsubscribe, you can do it via email confirmation. If you have trouble unsubscribing, please send a message to the list detailing the problem. <br></div><div><br></div></div></body></html>