[RE-wrenches] Not RFI

[Joel Davidson]

Hello William,

Thanks for the reply. I was mis-thinking twisting wires and EMF, not RFI. Also something inverter manufacturers should consider.

Best regards,
Joel Davidson
  ----- Original Message ----- 
  From: William Miller 
  To: RE-wrenches 
  Sent: Saturday, March 28, 2009 9:41 AM
  Subject: Re: [RE-wrenches] Odd Outback FNDC/Mate issue


  Joel:

  I am correcting you.  Twisting wires causes cancellation of RF energies.  This is true for wires that have RF energy on them that you wish to keep from emitting RF energy or wires that do not have RF energy and you wish to prevent them from receiving RF energy.

  Therefore, if one could twist battery cables tightly enough, one might reduce RF emitted from them.  This is not always practical for 4/0 cables, but is practical for small gauge sensor wires.

  One of the best wires for rejecting RF energy is your garden variety Cat 5 cable.  We use it to send audio signals (I volunteer as a technician for entertainment events) for up to 2,000 feet and in the same cable is a ring line with 100 VAC at 20 cycles.  There is no cross talk.  What also makes this possible is the audio signals are a true balanced signal --  every electron that moves one direction causes another electron to move the other direction in the other cable.  This allows "common mode rejection."  This is cancellation of any induced signal.  The induced signal causes electrons to move in the same direction at the same time in both wires of the pair.  This equi-direction signal can be easily removed by a transformer or matched linear amplifiers.

  I go into this detail only in hopes engineers with Outback might see if these principals might be applied to future designs.

  William Miller


  At 09:17 AM 3/28/2009, you wrote:


    Please correct me if I am wrong, but I thought that twisting wires creates a magnetic field and increases radio frequency interference.

  Please note new e-mail address and domain:

  William Miller 
  Miller Solar
  Voice :805-438-5600     Fax: 805-438-4607       
  email: william at millersolar.com
  http://millersolar.com
  License No. C-10-773985




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


  _______________________________________________
  List sponsored by Home Power magazine

  List Address: RE-wrenches at lists.re-wrenches.org

  Options & settings:
  http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

  List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

  List rules & etiquette:
  www.re-wrenches.org/etiquette.htm

  Check out participant bios:
  www.members.re-wrenches.org

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20090328/c2870777/attachment-0004.html>