I have not seen anything to do with PL in rpt.conf. Can you please point me in the right direction. Thanks David -------- Original message --------From: N6GKJ Land <n6gkj1@gmail.com> Date: 9/19/18 8:20 PM (GMT-06:00) To: Users of Asterisk app_rpt <app_rpt-users@lists.allstarlink.org> Cc: kd2bxf_kev@geezerlab.com Subject: Re: [App_rpt-users] Audio Hum Also make sure that rpt.conf is set up properly. Make sure your not transmitting PL tone mixed on your audio. That happened to a friend of mine On Wed, Sep 19, 2018, 7:50 AM lengriff@optimum.net <lengriff@optimum.net> wrote: Recently, my repeater at 42690 began developing an audio ' hum ' . An Asterisk restart does not stop it. A reboot is required. It is NOT power supply related. I tried substitute supplies for the Pi and Repeater. The message log shows not related errors. It is software related somehow. [ short audio file attached ] Len WB2HKK_______________________________________________ App_rpt-users mailing list App_rpt-users@lists.allstarlink.org http://lists.allstarlink.org/cgi-bin/mailman/listinfo/app_rpt-users To unsubscribe from this list please visit http://lists.allstarlink.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" 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.