[AusNOG] Earthing problems and switching infrastructure.

[Paul Wilkins]

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/
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