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Blades-TX's and Frame rates ?

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  • #1

    Blades-TX's and Frame rates ?

    I've just read an article on the Blade 450X in Quiet and Electric Flight.

    The writer, a Kevin Crozier started initially setting up the 450X with a JR DSX9 but found that the tail wagged.

    Instead of adjusting the BeastX he thought it may be a "frame rate issue" with the JR.

    He then setup the 450X with a Spectrum DX6i which solved the tail wag problem assuming that the DX6i has a higher 11 ms frame rate.

    My query is, are all the Blade Helis. from the Nano up subject to this 11 ms frame rate?

    I'm waiting for the 130X Mk2 to appear, however I only have either a Spectrum Dsm2-7 or a JR DSX9 available to use. So am I going to get the correct performance from a 130X with DSM2 technology or do you now need the newer DSMX TX's to get the best trouble free performance or should the BeastX have been tweaked on the 450X to get it setup correctly?

    There is of course "no tweaking" on the lesser Blades RX's, so is this 11 ms Frame Rate the reason why some are flying better than others?

    He eventually ended up with a DX8 Spec. which suited the switches for him.

    Flybar
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  • #2
    Originally posted by Flybar View Post
    He then setup the 450X with a Spectrum DX6i which solved the tail wag problem assuming that the DX6i has a higher 11 ms frame rate.
    I do not believe that the DX6i has the 11ms rate, it has DSMX now, but there is no option on the radio to pick between 11 and 22ms and that would be needed to maintain compatibility with analogue servos is 11ms was available.

    The only option on the radio is to select DSM2 or DSMX so I would say it only offers 22ms so the rest of the suggestions are based on a false premise.

    It was somewhat odd that he would go for frame-rate as a problem resolution in the first place, 22ms is more than adequate.

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    • #3
      Originally posted by Mark_T View Post
      I do not believe that the DX6i has the 11ms rate, it has DSMX now, but there is no option on the radio to pick between 11 and 22ms and that would be needed to maintain compatibility with analogue servos is 11ms was available.

      The only option on the radio is to select DSM2 or DSMX so I would say it only offers 22ms so the rest of the suggestions are based on a false premise.

      It was somewhat odd that he would go for frame-rate as a problem resolution in the first place, 22ms is more than adequate.
      If it was true spec 22ms it would be ok. But Spektrum only transfer half of the channels in one frame and thus you need 2 frames before all servos update. This means that what they call 11ms is in fact equivalent to a 22ms system. So whilst 11ms may look as one of the fastest systems available it is in fact one of the slowest.

      Attached a capture from my logic analyser showing two sequential DSMX frames and the channels each carry.

      EDIT: RCHA resized the photo and the text ins't readable. Here are the channel names...

      Frame A: Aile, Aux1, Elev, Rudd, Aux2
      Frame B: Gear, Thro, Aux3
      Attached Files
      Last edited by Angelos; 03-03-2015, 11:59 AM.
      SPARTANRC - R&D

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