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: [email protected]
http://millersolar.com
License No. C-10-773985
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