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Neon Sign Noise



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