Parker Swanson, LBCC, Oregon
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Post by Parker Swanson, LBCC, Oregon on Mar 28, 2017 15:03:27 GMT -7
Like everyone else, we're trying to improve the performance of the Ubiquiti 5.8 GHz link. We noticed that the specified supply voltage (POE) for the Rocket M5 is 24V, but the payload power board delivers 12V to it. Has anyone tried raising the voltage to the specified value to see if there's any improvement? Thanks!
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Post by Skylar MSGC on Apr 19, 2017 14:55:06 GMT -7
At MSGC that is one of the main things that we had to consider when designing the Power board that you are using now. According to the spec sheet for the Ubiquiti M5 modems, each modem needs 8W (watts) of power. This means that at 24V you only need .33A of current to get your wattage, where at 12V you need .66A to get the operational power for the modems. The power board has dc-dc converters on it called the PTN04050cah, if you look up the data sheet you'll see one of the aspects and capabilities of this dc-dc is that it can provide up to 12W from 3.3V-15V via a pin that is set by a resistor.
That said feel free to test out if there is a difference between the two. Here at MSGC we don't have the proper testing equipment to test strength of the antennas with a EMsensor when powering them at one of those voltages. If you discover something that you feel would be useful for other groups to know feel free to post about it.
I apologize about the late response, school work has kept me from being able to spend an time answering questions lately.
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Post by Randy MSGC on Jun 12, 2017 12:08:05 GMT -7
We originally flew the Ubiquity M5 at 24 Volts...in talking with the Ubiquity folks it was determined that 12 volts would work fine...the trade off was finding a DC to DC converter that provided +24 volts from a 3.7 volt lithium battery at a resonable cost. Early on we tested the U5 with both 12 volts and 24 volts and found no difference in performance.
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