Battery back up to a R100 repeater

[Lee S]

Have a R100 repeater that lacks the battery back up guts and would like to add such to it so have redundant power in case of emergency. How can i go about building and installing a trickle charge circuit and tie it in to the Power loop? Knowing my luck probably such out there already and easily added in.

Any help/ advice is appreciated

[kcbooboo]

The power supply in the R100 manual only shows it with the battery backup feature, which I thought was standard. You'd have to duplicate the functionality, which includes the trickle charger and a voltage comparator to detect loss of incoming AC power, plus a relay that actually switches the battery in to run the station.

You could probably use a small external battery charger and either a relay or some 25A diodes to isolate the battery and the internal station supply. The R100 manual power supply schematic should give you some idea of where to connect things.

Bob M.

[abbylind]

In the battery mode it adds a rodger beep after each transmission