goodings(at)yorku.ca
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 Posted: Sat Nov 24, 2007 9:02 am Post subject: Electrical grounding with a primed airframe |
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I would run the pair of battery cables close together; twisting them is
not necessary. Here is my reasoning - long on theory and speculation!
Radiation pick-up, particularly of radio frequency, is a black art. We
have had a difficult time removing noise from a Becker transponder which
was getting onto our ICOM radio, and breaking up the transmission and
reception. We were able to trace the noise as being present on the power
bus, to which the radio was attached. The cure was to place an
(electrically isolated) Ameri-King noise filter in the power leads to the
radio. Other locations of the filter should have worked, but did not.
How does any of this apply to the question posed about the battery leads?
If the long battery leads are well separated, what you have created is one
turn of a large coil which is an integral part of the power bus. A large
turn of a coil has appreciable inductance, which can act as an antenna for
radio frequency. The inductance increases with the area of the coil; two
wires close together have only a very small coil area. In our case, we
did not have long battery leads. Nevertheless, the principles outlined
above are basically sound. Thus, if I had long battery leads, I would NOT
separate them!
John Goodings, C-FGPJ, CH601HD with R912S, Carp/Ottawa, Toronto/Waterloo.
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