At 06:07 PM 03/22/07, you wrote: >Was wondering if anyone knew of a way to tell a MSF500 CXB station when >the main power failed and a UPS kicked in (External dry contact closure >fro mthe UPS is available) ? Our units (VHF And UHF Repeaters) do not >have a battery revert option in the power supply so we used a >UPS/Generator combo for emergency power. The UPS Carries for about 5 >minutes before the generator kicks in (200KW at the site), Just want to >drop the output power for the 5 minutes to make sure the UPS will carry >it through or if the generator fails to start I would know from the low >power beep. Thanks for any help or info. > >Keith L. Dobbins KC8RFW >W8TAP Repeater Association >Repeater Technician >Parkersburg, WV 26101
Are you using the CXB as a stand-alone repeater, or do you have an external repeater controller attached to it? We had the same problem with a Micor-based repeater that had an SCom-7K attached to it, and solved the problem with a reed relay and a wall-wart transformer. The relay contacts were hooked from a digital input to ground, and the wall-wart was hooked to the relay coil. On power fail the relay dropped out and the digital input went high. The station normally operated with no reset beep, when power failed it became a morse "N". The IDer changed from W6xxx to W6xxx(space)NP and also went from 900hz to 1200hz. Mike WA6ILQ
