[NSRCA-discussion] electric interference question

[John Pavlick]

Sounds like the "new guy" knows a bit about electrics. Cool. You're going to
have fun with this pattern stuff!

John Pavlick
http://www.idseng.com


BTW - Any problem that can be solved with Ferrite beads is in fact Black
Magic. It's right up there with coiling the scope probe lead in the opposite
direction to get a cleaner signal. Who says this is a digital world? <LOL>

  -----Original Message-----
  From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Larry
  Sent: Saturday, May 13, 2006 11:19 PM
  To: NSRCA Mailing List
  Subject: Re: [NSRCA-discussion] electric interference question


  That type of glitching (power on) can be coming from several things. The
battery, ESC, BEC and motor can all be generating noise.

  It can often be cured by changing the relative positions of the key
pieces - RX, antenna, Batts, BEC, ESC.

  Usually the batts cant be moved for CG reasons - but they can be a huge
source of noise. Moving other components AWAY from the bats can often help.
Shorten up all the battery and motor leads and make sure all connectors are
in good shape. Don't route leads from servos or the BEC near the battery.
They all act like antennas and the battery is a big generator under load.

  The esc needs to be between the battery and motor so your choices there
are limited also.

  The BEC can often be re-located fairly easily. Keep it as far away from
the batts and RX as possible. A torus on the BEC lead sometimes helps too.

  The key element is the rx. Remember that every wire that goes into the rx
can act like an antenna as far as noise input. Keep it as far away from ALL
the other items as possible, but especially the batteries and esc. Try
re-routing the antenna.

  Sometimes noise reduction in electrics seems more like black magic than
science. I have had planes that were uncontrollable until one component was
moved just an inch or two or wires were moved from one side of the fuse to
the other.

  Good luck!

  Larry
    ----- Original Message -----
    From: George Miller
    To: NSRCA Mailing List
    Sent: Saturday, May 13, 2006 7:48 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



----------------------------------------------------------------------------


    _______________________________________________
    NSRCA-discussion mailing list
    NSRCA-discussion at lists.nsrca.org
    http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
--
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.392 / Virus Database: 268.5.6/338 - Release Date: 5/12/06
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.nsrca.org/pipermail/nsrca-discussion/attachments/20060514/7ea3d0ca/attachment.html