[AusNOG] Leaky Feeder & UTP

[John Edwards]

Running leaky feeder at 100W EIRP is going to cause all kinds of major
issues, although induced current in nearby UTP probably isn't one of them.

Technically a "radiated" signal from notches in leaky feeder is going to be
at right angles to parallel cables and unable to induce a current, the risk
is from the difference in EMF between parallel conductors. Separation
distance is also prudent for electrical safety between systems that have
different electrical characteristics, in the event of an incident that
causes the cables to become uninsulated and in contact with each other.

John


On Tue, 3 Mar 2020 at 22:21, Nathan Brookfield <
Nathan.Brookfield at simtronic.com.au> wrote:

> Mal,
>
> I think it all depends on the band to be honest but it’s most likely to be
> UHF 400-520MHz in which case even if if was radiating 100 Watts EIRP it’s
> unlikely to cause you any major issues if you’re any more than 300mm away.
>
> The impact of RF signals on data traveling through the line would be
> negligible, the likely impact may be where the coax runs near your Ethernet
> repeaters or switches but these days even so they’re usually fairly
> shielded.
>
> Someone with much more knowledge than me may have more insight but I’d
> feel fairly comfortable with a separation as mentioned above, once again
> dependent on the band.
>
> Kindest Regards,
>
>
> Nathan Brookfield (VK2NAB)
>
> Simtronic Technologies Pty Ltd
>
>
>
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> On 3 Mar 2020, at 21:02, Mal <malz at jetlan.com> wrote:
>
> Interested in hearing from any RF gurus who have run Leaky Feeder and
> unshielded UTP cables, in underground tunnel environments - what cable
> separation distance did you use to minimise any noise from the UTP
> services that are run in parallel ?
>
> Regards,
> Mal
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