Multiplex Heron – Build Report – Power Supply

Last Change: 17.04.2017   

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The controller supplied with the kit comes with a Multiplex (MPX) power connector, which is not too much of a surprise für a Multiplex kit. Unfortunately, the standard at Flying Tom’s is XT connectors – XT30 through XT90. For the 3s power supply of the Heron it shall be an XT60. We do not want to compromise the resale value of the model before it has even passed its maiden flight. So we will not remove the MPX plug but build an MPX-to-XT60 adapter instead. This adapter will also provide flight pack voltage data for the telemetry sensor of the AR7350 receiver.

We need these components:

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1) Lipo flight pack battery with XT60 plug (female)
2) XT60 plug (male)
3) Silicone braid wires, red and black, cross section 2 mm2, approx. 10 cm each
4) MPX plug (female)
5) BEC/JST plug (female) with 15 cm wires
6) Spektrum telemetry flight pack voltage sensor (SPMA9570)
7) Spektrum AR7350 receiver with 1 satellite

After the soldering, with the wiring shortened to specification and some shrink-on tube  added, the “oeuvre” looks like this:

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One XT60 connector (yellow) from the flight pack, one MPX connector (green) to the controller and one  BEC/JST connector (red) to the telemetry sensor. This is not rocket science, but it is very useful.

All components are plugged together for a test. As the controller’s BEC is not yet available for powering up the receiver, we use an additional 6 volts NiMH battery instead.

Now we pick up the flight pack voltage at the MPX connector. The voltmeter reading is 11.3, which is the expected storage voltage of the 3s lipo battery. We compare the reading with the figure displayed on telemetry screen of the DX9: 11.3 volts as well. The third reading taken with the voltmeter from the battery’s balancer plug also says “11.3”. – Test passed!

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