[AusNOG] Earthing problems and switching infrastructure.

[James Harmey]

What's the proximity to the 6PR transmitter? I've heard AM radio off a
chain link fence under the right conditions. That stuff gets into
everything.

If it's only happening on a single floor there is something ungrounded
there. Hard to track down though, best to get in a professional.


On Mon, 20 Mar 2017 at 7:14 pm, Chris Hurley <chris at minopher.net.au> wrote:

> I would get it tracked down by suitable people, it’s one of those things
> 90% of time not a biggie but you don’t want that 3am call out and then
> trying to find a floating earth or an earth leakage fault. And it will be
> in the middle of a down pour increasing the problem.
>
> Regards,
>
> Chris Hurley BE (Elec)
> Signal Manager
>
> ******************************************************
> Dragon Rail Pty Ltd     Phone: 1300 730 531
> 74 Allanfield Crescent
> Boronia,  3155 Victoria
>
> Australia
> ******************************************************
>
>
> From: AusNOG <ausnog-bounces at lists.ausnog.net> on behalf of Paul Wilkins <
> paulwilkins369 at gmail.com>
> Date: Monday, 20 March 2017 at 6:55 PM
> To: "ausnog at lists.ausnog.net" <ausnog at lists.ausnog.net>
> Subject: Re: [AusNOG] Earthing problems and switching infrastructure.
>
> Doubtful. You're not going to be inducing 0.5V. I'd be more worried that
> the ground is floating, which definitely can cause signal and equipment
> problems.
>
> Kind regards
>
> Paul Wilkins
>
> On 20 March 2017 at 18:36, Peter Tiggerdine <ptiggerdine at gmail.com> wrote:
>
> the radio station is 6PR so it's AM.
>
> There's no onsite PABX or music being fed into it.
>
> It's happens on one floor of a multi storey building.
>
> Is the consensus that this type of interference can cause network
> performance problems?
> Regards,
>
> Peter Tiggerdine
>
> GPG Fingerprint: 2A3F EA19 F6C2 93C1 411D 5AB2 D5A8 E8A8 0E74 6127
>
>
> On Mon, Mar 20, 2017 at 5:07 PM, Paul Wilkins <paulwilkins369 at gmail.com>
> wrote:
> > Any analog telephony streaming music on hold from the internet? So just
> > appears it's coming over the air, but actually EMI bleeding from their
> MOH
> > server?
> >
> > Kind regards
> >
> > Paul Wilkins
> >
> > On 20 March 2017 at 17:40, Damien Gardner Jnr <rendrag at rendrag.net>
> wrote:
> >>
> >> Few questions..
> >>
> >> How 'local' is the radio station?  Within a km? or just within 50km?  AM
> >> or FM station?
> >>
> >> Do they hear the radio station if they touch the probe to themselves?
> >>
> >> Does the customer have a PABX with that radio station fed into it from a
> >> connected radio?
> >>
> >> If no fed PABX, and the station is FM that is VERY unusual.  AM, I could
> >> understand, if there's a IF being generated by some equipment which is
> >> modulating at almost exactly the station's frequency.
> >>
> >> I'd be finding the building's MEN bond, and testing there, then working
> >> your way back out to the individual equipment, and see where it's
> >> introduced.   That said, I'd probably just call a qualified
> electrician, as
> >> they're more likely to spot the issue, and you'll likely need to take
> the
> >> front off the switchboard to get at the bond point.
> >>
> >> On 20 March 2017 at 17:24, Peter Tiggerdine <ptiggerdine at gmail.com>
> wrote:
> >>>
> >>> Hi All,
> >>>
> >>> I've got a customer that can touch any steel object that's connected
> >>> to earth and listen to the local radio station with a tone generator
> >>> wand. I've chalked this up an earthing problem touching a copper rod
> >>> or possibly building antenna.
> >>>
> >>> The question is weather this is likely to impact switches and possibly
> >>> network performance. I'm airing on the side of very unlikely but it's
> >>> all frequency so unsure.
> >>>
> >>> Happy for off list or on list replies.
> >>>
> >>> Regards,
> >>>
> >>> Peter Tiggerdine
> >>>
> >>> GPG Fingerprint: 2A3F EA19 F6C2 93C1 411D 5AB2 D5A8 E8A8 0E74 6127
> >>> _______________________________________________
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> >>
> >>
> >>
> >>
> >> --
> >>
> >> Damien Gardner Jnr
> >> VK2TDG. Dip EE. GradIEAust
> >> rendrag at rendrag.net -  http://www.rendrag.net/
> >> --
> >> We rode on the winds of the rising storm,
> >>  We ran to the sounds of thunder.
> >> We danced among the lightning bolts,
> >>  and tore the world asunder
> >>
> >>
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> >>
> >
> >
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