RE: How to avoid interference ?

["Neil Wrightson" <neilw@xxxxxxxxxx>]

Hi,

I have to agree with Frank on this.
Low voltage is definitely the way to go. If you were to check your local
electrical authority I bet you would find that mains cables must be buried
approx 1m below ground, in underground rated conduit with various
mechanical
barriers above the conduit i.e. concrete pavers and appropriate signage
etc.
110/240VAC will cause a lot of 50/60Hz crosstalk in signal/data cables in
the same conduit.

The comment about stronger fields with more current is fair enough, but I
would use a DC supply 12/24VDC and drive the lamps from this. Because it is
DC the field will not be alternating and affecting the signal in any way.

Regards,

Neil Wrightson.


-----Original Message-----
From: Keith Doxey [mailto:ukha@xxxxxxx]
Sent: Friday, 30 September 2005 6:07 PM
To: ukha_d@xxxxxxx
Subject: RE: [ukha_d] How to avoid interference ?



> Not able to use low voltage for garden lighting ?? A lot
> safer  and easier .....
>

That could potentially make interference worse!

For a given wattage, lower voltage means higher current which would in turn
generate a stronger magnetic field around the cable.

Low voltage would be much safer though.

10 meteres isnt very far at all and the lighting cables shouldnt generate
much of a magnetic field anyway as the current flowing up one wire would
cancelled by the current flowing back down the other wire.

Losses in the CT100 would be negligable as the LNB output is so high.

If you are running along side a garden path, could you not run power down
one side and comms/data/sat down the other side. Twice as much digging but
it would eliminate any possibility of interference, failing that, just
ensure a few inches separation.

Regards

Keith







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