DWL-900AP+ External Mounting Environmentals ;-((

Tim Kerby tkerby at tkerby.f9.co.uk
Mon Dec 30 19:43:48 EST 2002

AC is used to remove reactive lossed.  If you think of the whole electricity
system as a big capacitors and inductors which technically it is, then a
huge amount of power would be required to 'charge it up'.  AC reduces these
losses, and as Brett said, is a lot easier to work with when it comes to


----- Original Message -----
From: "Brett Lymn" <blymn at baesystems.com.au>
To: "Grahame Kelly" <grahame at wildpossum.com>; "Wireless List"
<wireless at lists.samba.org>
Sent: Sunday, December 29, 2002 11:28 AM
Subject: Re: DWL-900AP+ External Mounting Environmentals ;-((

> On Sun, Dec 29, 2002 at 09:41:19PM +1100, Craig Sanders wrote:
> >
> > AC loses less voltage over long cable runs.
> >
> Errrr electrically speaking, that is nonsense.  Whether you punch AC
> or DC over the cable is moot for the sort of runs you are talking
> about.  Using 12VDC would be just as effective as using 12VAC.  You
> box needs X Watts of power to run - by feeding 12V up the wire you can
> transfer that many watts with a lower current which reduces your
> losses due to resistance of the wire.  AC is used for domestic power
> distribution because it is easy to change the voltage using a
> transformer, the main distribution lines run at may thousands of volts
> (sometimes millions of volts) for exactly this reason, reduce the
> resistive losses for the given power transferred.
> --
> Brett Lymn

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