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Signal Interference between Servos

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  • Signal Interference between Servos

    My motor runs with flutter in speed as the aft servo also flutters. The aft plane servo flutters when motor is running causing the motor to have interrupted RPM. The Aft servo is connected to the ADF2 Pitch section which in turn is connected to the receiver channel 6. I am using a WFLY 08 Transmitter 75 MHz with a WFLY receiver 70 MHz , crystal 70 on both. Is this the issue, ie 75 vs 70?
    Any body can help?

  • #2
    Do you have capacitors on the motor? Another thing that may help (if you do have capacitors installed) is a Ferrite Ring.
    If you can cut, drill, saw, hit things and swear a lot, you're well on the way to building a working model sub.


    • #3


      • #4
        Yes, I got capacitors. Will try ferrite rings. But why only the aft servo which is connected to the ADF2?
        I have another identically powered boat but no similar issue.


        • #5
          That question is right up there with the meaning of life! lol I am not sure why.
          If you can cut, drill, saw, hit things and swear a lot, you're well on the way to building a working model sub.


          • #6
            Have you tried plugging in a different servo? I have found that some brands seem to have issues. Might be tied to voltage from the BEC or servo linkage binding but for me, usually finding a different servo makes the fluttering go away.


            • #7
              I'm going to go out on a limb here and suggest it may be caused by power spikes w/the ADF2 on that particular channel.

              When the ADF2 is actively working it may be causing "spiking" on the system as it needs power, as the servo it's connected to adds to it as well. Thereby creating more load on THAT channel.
              So a "Glitch Buster" might be the answer. They act as "storage" to even out the voltage throughout the VCC distributed by the RCVR as different components are being utilized.

              I used them on ALL my old 75Mhz Rcver's

              You can build it yourself for pennies:
              How to Make Your Own Rc Car Recever Glitch Buster for $1

              Or purchase one:
              Novak 5626 Glitch Buster Capacitor

              I made my own for my Teskey PROTEUS WTC (WIP). Went with a 2200uf 6.3V Electrolytic Cap (Mfr P/N ECA-0JM222) after I found out what was actually being used in the NOVAK .

              I plug it in the old RX Battery Port since I get power from my ESC's. If that's not available either any unused channel, OR piggy back it onto a servo connector.

              Here it is in the closed Water Tight Compartment:
              Click image for larger version  Name:	GB01.jpg Views:	1 Size:	493.1 KB ID:	122919

              As you can see from this earlier picture of the WTC partially assembled, it is quite congested already in order to have all the functions I wanted.
              With all that going on, a "Glitch Buster" was warranted.
              Click image for larger version  Name:	GB02.jpg Views:	1 Size:	447.2 KB ID:	122920

              The point being here it's a relatively inexpensive solution to try.

              Give us feedback regardless if it helps if you do.

              "Sub" Ed
              Last edited by QuarterMaster; 08-15-2017, 12:14 PM.
              NEVER underestimate the power of a Sailor who served aboard a submarine.


              • #8
                that is a great suggestion! I have wanted to try one, but seem to forget about them. Thank for the reminder!
                If you can cut, drill, saw, hit things and swear a lot, you're well on the way to building a working model sub.


                • #9
                  If you disconnect the ADF2 from your aft servo and reconnect the servo without using the ADF2 I think you will find that your fluttering, at least of the stern planes will go away


                  • #10
                    Your ADF2 is picking up the vibrations produced by the motor. After reconnecting your ADF2 put the sub in some water and operate it. Many times being submerged in water , the water itself absorbs much of the vibrations and you will then be able to live with the minor fluttering that may remain