10 Sep 2002 robotdojo   » (Master)

I had a problem with using a Hitec dual conversion FM receiver (modified for 75MHZ surface frequency) on Wedgeward-HO. Everytime the bot would lose the transmitter link, or when first powered up, the IFI Victor 883 ESC's would detect a signal from the receiver and would momentarily send motion signals to the motors. This was especially damaging to the lifting wedge weapon motor, as the wedge would go to end-of-travel (no limit switches) and cause the motor(taken from a battery powered drill) to stall. Enough of those and the motor(s) went bad. It also would cause a safety violation at the competition. I replaced the Hitec FM with a Futaba 75 Mhz PCM receiver last night and the problem went away. I was warned by a fellow engineer who builds helicopters that the cheaper Hitec's were noisy, but thought I could get away with it. Nope.

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