Laryn, Your thinking is good. A simple relay, 3 pole/double throw would do what you want and power the relay coil with your normal AC power. When it goes the relay drops out and connects the repeater to the RED emergency outlet.
As someone else suggested switch all 3 wires of hot, neutral and safety ground just to make sure you are not connecting something that you should not. Some suggest runing the repeater on the RED emergency outlet and all else on the normal outlet. You need to check to see if this RED outlet is powered all the time and not just when the gen/emergency power is running. Since it goes to the generator it might not be. Easy to check by plugging a lamp under normal power conditions. The only problems I see is the sudden switching back and forth that might occur quickly serval times in a short period. Like turning on/off the repeater power supply rapidly, but don't think this would be an issue. 73, ron, n9ee/r >From: Laryn Lohman <[EMAIL PROTECTED]> >Date: 2008/07/13 Sun PM 08:17:51 EDT >To: [email protected] >Subject: [Repeater-Builder] Switching a Repeater Betwen AC Sources > >We have two repeaters, plus an IRLP computer, on one emergency-fed >circuit at a hospital. There are normally no problems with this. >During a recent storm, the AC panel circuit breaker tripped, taking >everything down in the middle of our Skywarn net. > >There are two receptacles near our equipment. One is normal power, >the other is the red Critical Power receptacle. What problems would >anyone see if we would feed everything from the normal power circuit, >and if it would ever trip off, switch to the red receptacle. That >way, if lightning trips the normal circuit, we would instantly feed >our equipment from the red receptacle. > >This sounds so simple, and I'm inclined to build such a setup, but am >I missing something obvious that could cause problems? Any better ideas? > >Laryn K8TVZ > > > Ron Wright, N9EE 727-376-6575 MICRO COMPUTER CONCEPTS Owner 146.64 repeater Tampa Bay, FL No tone, all are welcome.
