[BC] Humming Preamps

[Dana Puopolo]

It's possibly harmonics from an AC high tension wire nearby.
-D

------ Original Message ------
Received: 
From: "Mark Humphrey" <mark3xy at gmail.com>
To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
Subject: Re: [BC] Humming Preamps

On 4/7/07, RadioPower Webmaster <webmaster at radiopower.org> wrote:
> By the way a
> Verizon tech had to install inline RF filters to cut the humming and
> noise from our phone hybrids. I've never met a building this noisy.

Do you know for sure if Verizon installed RF filters, and if so, did
they make a significant improvement on the phone audio?  If so, then
it's probably an RF problem.

>From your description "a buzzing sound that seems faster higher
frequency than 60 cycle hum", I wonder if it's sync buzz from a nearby
TV transmitter?

Mark
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