Tim, (that isn't the "Tool-Man Taylor" is it? Bet you get that alot.
Sorry :^)
I think your neighbor needs to call up Nutone and have a talk with them
about their defective product. For them to say they cannot help is
unbelievable! They designed the thing. They should be able to resolve
defects in it. Period!
I would strongly suggest to your neighbor to call the manufacturer and put
the fault squarely on their design and lack of filtering, and then demand a
resolution. He could explain that this problem is being discussed on a
nationwide internet discussion group, and we are all waiting to hear what
they have to say about their design and product. This is the kind of
pressure that needs to be exerted on these manufacturer's to get them to
change. They need to know their name is being dragged through the mud
unless they come up with a better response then they can't help. That's
Barbara Streisand! They have an engineer somewhere who can help, or else
they shouldn't be selling any products.
Now to your question. I imagine you're on good terms with your neighbor or
else you wouldn't be so willing to help him. But, I would not do any EMI
filter work yourself without assessing the risks. I would be willing to
show him what needs to be installed and how to install it, but anything
beyond that opens up a liability. If you're best friends, you may feel
comfortable helping out a little more.
As for who can do the work, it depends on your state laws. It may require
a licensed electrician or service technician. It may depend on Nutone's
resolution assuming they come up with one. I don't recommend the use of
capacitors as that may cause damage to newer solid state amps.
Ferrites are the best choice and should cure the problem if it's mainly
audio rectification via common mode pick-up (I assume). There are
instructions that come with the Radio Shack ferrites that show how they
should be installed. You could give them as a gift to your neighbor and
show him how to install them. Then let him do the installation.
Be a good neighbor but be cautious.
73,
de ed -K0iL
-.-. --.- .... .- -- ... -.. . -.- ----- .. .-.. -.-
Ed Edwards -- K0iL
PO Box 375 k0il@arrl.net
Elkhorn, NE 68022-0375 k0il@qsl.net
496-3415 home 552-5425 work 552-5505 fax
Visit my web site: http://www.qsl.net/k0il
or HDXA's web site: http://www.qsl.net/hdxa
--... ...-- . ... --. .-.. - --- ..- --- -- ...-.- . .
On Saturday, 06 January, 2001 1:59 PM, Tim Taylor
[SMTP:tim-taylor@home.com] wrote:
> My neighbor has an extensive IM 4006 Nutone music/intercom. I believe he
has a complement of at least 18 speakers throughout the house. Well
needless to say, after I put up my tower, I can be copied quite loud on his
intercom. This is true for all frequencies from 80 - 10 at power levels of
100 watts and up. I've called the local Nutone dealers but they can't
provide any help.
>
> It appears as though the speakers are connected to a main unit through 6
conductor ribbon cable. The inside of the 'rough out" is quite crowded with
little room to work.
>
> As is true of any RFI case, I hesitate to go inside the unit to apply
caps or ferrite. Who could I turn to that could perform the work?
>
> Anyone authorized dealers want a free trip to Florida?
>
> Thanks for any help/advice.
>
> -Tim
> << File: ATT00000.htm >>
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