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Bendix King RDPR Charging System Upgrade

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BlueDevil

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I have come to find out that there seem to be some major engineering flaws with the Bendix King Rapid Deployment Portable Repeater system. For starters the unit must be on in order to charge the batteries. This sets up the user for potential failure if they come back later and unplug the repeater from charging and forget to shut the unit off. The other issue is that the main circuit board is powered solely off the batteries. If the batteries drop below about 8v then the unit will not power on. Since the unit has to be on in order to charge the batteries this quickly creates a paperweight.

Below are some pictures of a Charging System Upgrade I performed on a couple of our repeaters. This allows for easy charging with an after market trickle charger to make sure the batteries are always topped off. This also give the user an external port to actually check the voltage of the batteries which is important for monitoring your draw/usage.

Questions, comments, concerns, and suggestions are welcome!!

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BlueDevil

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Use this Battery Tender Voltage Indicator to plug into the new battery charging port to determine your current battery voltage and help identify your draw/consumption.

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mancow

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How else would it work if not powered from the batteries, or does it not run from external non charge power?

Seems like they would use lithium ferrite instead of lead acid. Lots more power per weight.
 

BlueDevil

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It has an external power adapter that is used to charge the batteries. It seems like the external power adapter/charger could power the circuit board and charge the batteries at the same time. As it is the external power adapter will ONLY charge the batteries. The circuit board is solely powered off the batteries.
 
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