Please delete the attachement when replying to this thread. The limit is 200K after which your message will be rejected. Steve The asterisk computer is powered by a local AC outlet and the DC supply shares the same AC circuit. The AC and DC grounds are bonded. The DC supply also floats about 650 amp hours of battery back up. Even with all the batteries, I never had any luck using a inverter or a UPS tied to the DC buss. I thought it would be nice to power the windows based echo link computer from a computer grade UPS (or inverter) that uses the main DC supply with the batteries. But it introduces to much noise into the system that seems to only shows up on the UHF machines. So I have to have battery back up for the PC's separate of the system. Has anyone ever tried a "Car Computer" case that is designed to run off of 12 volts DC? I should have some time Wednesday night to try all of the suggestions, Thanks again. I will keep everyone posted. 73's Mike / KB8WLW 145.410 MHz PL 110.9 224.480 MHz PL 141.3 442.225 MHz PL 131.8 442.450 MHz PL 131.8 927.6125 MHz PL 131.8 Echo Link Node # 146520 This is a KB8RST Sponsored System www.kb8wlw.com kb8wlw@me.com _______________________________________________ App_rpt-users mailing list App_rpt-users@qrvc.com http://qrvc.com/mailman/listinfo/app_rpt-users _______________________________________________ App_rpt-users mailing list App_rpt-users@qrvc.com http://qrvc.com/mailman/listinfo/app_rpt-users