Re: How to avoid interference ?

[Richard Malcolm-Smith <rich@xxxxxxxxxx>]

egelbeertje wrote:
> Hi,
> next phase of my HA project is as follows :
> cable up the garden lighting (4 circuits of 230v) , supply 2 speaker
> channels and an IR return channel to the garden, and somehow manage to
> get 4 satellite coax cables to a dish with quad LNB at the end of the
> garden. (2 kids + swmbo probably want their own tuner someday :-)
> All of these wires will have to be confined into a small gap and they
> will have to run parallel about for about 10 meters.
> Any input on risk of interference from the 230v to the satellite
signal
> and how to avoid would be appreciated. Also good spec of satellite
coax
> would be welcome(I need to run a total of 4 times 40 meters of coax
> from the dish to the tuner(s) so already envision to buy HQ cable :-).
> rgds Rob

It will be fine. Sat cable doesnt need to be too flash unless you are near
a
source of interferance in the 950-2150 Mhz band, which includes cell
towers.
Mains is unlikly to have anything that high on it - when its driving
incandesant
lights there will be almost no harmonics (unless you dim them) and the
worst
case I have seen barely broke 1Mhz (trashing most of the MW stations for
about
100 meters) - but that was a seriously overloaded in wall dimmer so the
little
torroid would have being well into saturation and not doing its job.

Losses are also not a huge issue since the LNBs will put out quite a hot
signal
as it is.


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