From: Paul Jakma (Paul.Jakma at domain Digital.com)
Date: Thu 02 Sep 1999 - 14:08:14 IST
> AFAIK the DART does use DC. However, I've seen a problem like that in
> .de with 15kV / 16 2/3 Hz  overhead lines ca 30-40 m away. it
> caused the screen to "swim" in a very intersting way whenever a train
> passed. Actually, you could "see" the train coming when it
> was 5 minutes
i live beside the west suburban line (not electrified), and can also 'see'
trains coming on the TV (cablelink).. strange? could it be the large mass of
metal disturbing things in some way? Monitor on the other side of the house
isn't affected though.
As for the DART, isn't it AC on the lines and converted to DC by the
locomotive? (iirc there are huge efficiency losses in transmitting DC
compared with AC. The ineffiency rises with the voltage). And DC would still
create a big enough magnetic field to affect nearby CRT's.
(anybody remember any of those magnetic field formula's?)
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