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Some time ago you were so kind as to answer a question on UPS's for me relating to the switching times. the book states 20ms but you asked me to let you know the power of the UPS its 600 va its a small one that protects the power supply for a ubnt nano 5 about 5 watts, on interruption the nano fall's out and during what i think must be a reboot the speed drops dramatically. very slowly the radio recovers and the down load speed comes back. this is effected by a bad mains voltage in the area. I tried switching off and on the UPS and and this was sufficient to trigger the cut out. The break in the power supply is so short that the warning peep does not come on,on he UPS. I am currently buffering the the input of the UPS with a belkin anti spike multi way socket. this seems to help, but still the nano 5's so very sensitive. the radio seems to first shut down then slowly comes back to life. in the process the speed will drop from 12.5 mbs down to 200 or 300 hundred kbs. as the power supply in our area is so very poor on a saturday or sunday the nano 5 radio's seem to be almost permently down or running slowly does any one have any answers to this please .

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  • allan e milton Mar 30, 2011

    Thanks It takes me back to the 80's when i used to build my own stuff. its strange how you forget as every thing is of the self now



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The main problem here is more likely due to the not quite sinusoidal output of the UPS and the power adapter.
If I owned this unit myself, I would probably just put a large electrolytic capacitor across the 12V coming out of the power supply going into the POE injector [POE = Power Over Ethernet] to smooth out the transition and get rid of the ripple during UPS Up Time.
50V 4700uF capacitors are pretty common and therefore inexpensive, so I'd probably use something like that.
It's not the prettiest solution, but it should work!

Posted on Mar 27, 2011


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