[AusNOG] Earthing problems and switching infrastructure.

Mon Mar 20 20:39:23 EST 2017

6PR is only a baby transmitter – 720AM (ex 6WF) in Hamersley can heard by touching the 3.5mm input to a powered speaker or an fset wand from 10kms away..  

The building has to be close to the antenna, which from memory was in the water off Ascot… maybe?

From: AusNOG [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of James Harmey
Sent: Monday, 20 March 2017 4:44 PM
To: Chris Hurley <chris at minopher.net.au>; Paul Wilkins <paulwilkins369 at gmail.com>; ausnog at lists.ausnog.net
Subject: Re: [AusNOG] Earthing problems and switching infrastructure.

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 <mailto: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 <mailto:ausnog-bounces at lists.ausnog.net> > on behalf of Paul Wilkins <paulwilkins369 at gmail.com <mailto:paulwilkins369 at gmail.com> >
Date: Monday, 20 March 2017 at 6:55 PM
To: "ausnog at lists.ausnog.net <mailto:ausnog at lists.ausnog.net> " <ausnog at lists.ausnog.net <mailto: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 <mailto: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 <mailto: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 <mailto: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 <mailto: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 <mailto: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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