On Fri, Nov 9, 2012 at 5:37 PM, Michael Hayes < [email protected]> wrote:
> On Thu, 2012-11-08 at 16:57 +1300, Nick Rout wrote: > > > I think it is more a question of clean wiring - shitty connections, > > older switchboards, none of that helps. > > I doubt these are the reasons. My guess is that the there is more > signal attenuation in an older house, especially with wires run in metal > conduit, due to an increased capacitance. Furthermore, each room of an > old house is wired radially to the switchboard and so the path length > between adjacent rooms can be much longer. Again this increases signal > attenuation. > Actually I must admit that the first part of my statement (ie that that powerline sometimes doesn't work well over older wiring) is the only part I know. The reasons were supposition by me. Those with electrical engineering qualifications, (eg Volker) are far more qualified to comment, given that I never got past 1st Prof Electrical Engineering. > > Older houses also use loop wiring to reduce the number of conductors > within the conduit. This will increase the transmission line inductance > and cause discontinuities in the characteristic impedance leading to > additional signal reflections. But I guess this is a second order > effect. > > If someone could loan me some time, I could look at the literature... > > Michael. > > > > _______________________________________________ > Linux-users mailing list > [email protected] > http://lists.canterbury.ac.nz/mailman/listinfo/linux-users >
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