[NSRCA-discussion] electric interference question

[Larry]

I agree. It isn't ALWAYS the BEC :) 

I'm using a Medusa HV BEC in my Quest now with no issues at 10S and almost 2300 watts. I use HV BEC's in my Logo 20, Logo 10, Freedom 3D, Funtana 90. I also use lower voltage BEC's in my Maxir heli and in several other 3S setups where I wanted 6 volts to the servos or where I was running too many or to large servos.

I think BEC's get blamed all to often as the SOURCE of the RFI, when they are just a channel for it to get to the rx. BEC's are often mounted close to the controller and/or batteries and the leads often run together. This can cause the BEC to pick up the RFI from those other sources and lead it into the RX. 

Removing the BEC might indeed cure the problem, but (maybe) its not because the BEC was generating the RFI.

I have never had a BEC fail, but I have had RX packs go dead unexpectedly or forgotten to charge them.

In most of the cases where I had bad glitching, chokes had little to no effect and toroids were only a little better. The most effective cures for me have been re-locating/routing wires and components. In one case I had a bad servo connecter that did the trick. In other cases, unhooking everything and putting it all back pretty much how it started out cured the problem. 

Black magic :)

Larry
  ----- Original Message ----- 
  From: George Miller 
  To: NSRCA Mailing List 
  Sent: Sunday, May 14, 2006 8:33 AM
  Subject: Re: [NSRCA-discussion] electric interference question


  Thanks to all for the input/advice.  I'm running the HVBEC's successfully in my E-FocusII, IonX, and XeroG raptor conversion (all of which are running 10S lipo packs), but it is certainly worth a try.  I'll let you know what works!

  George
    ----- Original Message ----- 
    From: Verne Koester 
    To: NSRCA Mailing List 
    Sent: Sunday, May 14, 2006 9:38 AM
    Subject: Re: [NSRCA-discussion] electric interference question


    George,
    I've heard numerous reports that BEC's are bad news for setups that use large battery packs (pattern-size versus foamy-size). I'd suggest running a separate battery for the Rx, leave the choke in between your ESC and Rx, and make sure your Rx is as far away from your ESC as possible. Hope this helps and let us know how you make out.

    Verne Koester
      ----- Original Message ----- 
      From: George Miller 
      To: NSRCA Mailing List 
      Sent: Saturday, May 13, 2006 10:48 PM
      Subject: [NSRCA-discussion] electric interference question


      OK, this isn't exactly a pattern plane, but this group has a lot of expertise so I thought I'd ask here:

      I have a Showtime which I've built as an electric with AXI 5320/28 and Jeti Advance Plus Opto 90 amp ESC with a HVBEC for RX power.  The radio is a JR 9303 TX and PCMS receiver.  

      The problem is that I am getting some RF interference.  Ground range check is OK to 100 feet with antenna down and motor off, but when motor is turned on, the rx locks out (PCM)  until I either walk back a few yards closer, or put up the antenna.  I have gone from ppm to pcm RX, put toroid "RF Filters" on the leads from the ESC and both elevator servo's ( plane designed with elevator servo's mounted in tail with long leads to RX). I have also braided the wires between the motor and the ESC.  My next step is to try a different ESC, but I thought I'd ask here before shelling out a couple of hundred bucks for a new ESC. 

      Any other thoughts?

      Thanks,

      George



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