Re: Neon Sign Noise

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Luc by way of Terry Fritz <twftesla-at-uswest-dot-net>" <ludev-at-videotron.ca>

Hi Ed.

I'm a professional soundman for TV news and public affair show : Neon sign
are a
nightmare for wireless microphone in VHF and UHF . The interference are
radiated
directly from the tube, tx God they decrease at the square of the distance.
Take a
scope , use a short antenna you will see .

Luc Benard

Tesla list wrote:

> Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>"
<Esondrmn-at-aol-dot-com>
>
> Well, I hope Terry will let this pass.  It is not exactly on topic, but does
> involve neon sign transformers.  Please reply off line to me if you have any
> ideas.
>
> I recently moved my business (Yamaha golf car dealership) into a new
> building.  It has really cool neon tubing that runs around the showroom about
> 8 feet up off the floor.  It is broke up into about 4 sections that each have
> a 12 kv 30 ma neon sign transformer installed in the ceiling for power.  This
> is the first time I have owned any neon sign transformers that are actually
> doing what they are designed for.
>
> One section of the neon is right above the parts counter and the neon causes
> a lot of 60 HZ buzzing in the telephone that is sitting on the counter.  I
> want to get rid of this annoying buzzing in the phone.  If I shut the neon
> off, it goes away.  The phone is a standard two line phone with an intercom.
> I unplugged the ac power supply to the phone and the problem is still there.
> I tried plugging in the phone line to a different jack located about 40 feet
> away.  When the phone is brought over to the counter which is about 4 to 5
> feet below the neon, the problem returns.  As you move the phone, the buzzing
> intensifies as it gets closer to the neon and goes away when the phone is
> moved about 10 or 12 feet away on a straight line.  I tried using a 1.5"
> diameter ferrite core and looping the incoming phone line through it a few
> times and also tried it on the cord to the handset - neither did anything to
> reduce the noise.
>
> Anyone have any ideas?
>
> Thanks, Ed Sonderman
> Esondrmn-at-aol-dot-com