The cable itself is probably the problem. I'm no phone expert, but I install
phones once a year, for a convention. The best phone wire is twisted pair
single strand. If your landlord used four wire multi strand, not only will
you have a hum, but also some loss over the distance. Can the wire be changed?
--
Regards,
Declan Moriarty
Applied Researches - Ireland's Foremost Electronic Hardware Genius
A Slightly Serious(TM) Company
Without the optimist, the pessimist wouldn't know how happy he isn't
Was it Jeremy N. E. Proffitt who wrote on Sunday 06 October 2002 14:38:
> It is an extension to my landlord's shop. The hum didn't exist till after
> installation, they used standard four wire phone cable - not sheilded. My
> landlord installed this line himself. If you are in the shop and turn on
> the compressor or table saw, the hum gets worse. Is there a filter I can
> add or something?
>
> Cheers
> Jeremy
> ----- Original Message -----
> From: Syd H. Levine
> To: Multiple recipients of list CHIPDIR-L
> Sent: Saturday, October 05, 2002 11:48 PM
> Subject: Re: Eliminating 60 Cycle hum on phone line
>
>
> How do you know that is the direct cause? Buried phone lines are
> normally shielded, and power line hum is usually related to a ground fault
> of one kind or another. Another common cause is rodent damage in pedestals
> that can make those spots act like a semiconductor and pick up all sorts of
> noise. Did the hum get worse over time? Did it start suddenly? Has it
> existed since the installation? Who was the wise guy that put em in the
> same trench? Is this a telco installation, or private? ----- Original
> Message -----
> From: Jeremy N. E. Proffitt
> To: Multiple recipients of list CHIPDIR-L
> Sent: Sunday, October 06, 2002 2:23 AM
> Subject: Eliminating 60 Cycle hum on phone line
>
>
> Anybody out there have any good ideas on how to eliminate a 60 cycle
> hum from a telephone line. The hum is directly related to the phone wire
> being run with 500 feet of power cable in the same trench.
>
> Any ideas would be appricated.
>
> Thanks
> Jeremy
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Author: Declan Moriarty
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