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interference
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From: D.C. Cox [SMTP:DR.RESONANCE-at-next-wave-dot-net]
Sent: Friday, June 12, 1998 12:40 PM
To: Tesla List
Subject: Re: interference
to: Julian
You should run a pair of commercial RF filters in series -- 2 stage EMI
supression. Also a 1 1/2 size ferrite toroid with aprox 2 turns on each
leg of your power wires (hot and neutral) will help reduce any additional
RF. It's also a good idea to use a few varisters from each line to ground
at the xmfr input power points. This along with a 1 K, 50 watt resistor
off each xmfr bushing will help to keep RF kickback into the power lines at
a minimum. Don't forget to invite your neighbors over for a free BBQ
sometime soon -- if they understand what you are doing and think your work
is "cool" they are not so likely to think of you as a "geek" whose sole
intent is to destroy their TV reception while they are watching their
favorite prime time shows -- and be sure to find out when they watch the
most and don't run during those times. Trying hard to be a "good neighbor
with an interesting hobby" goes a long way towards reducing the
neighborhood pest syndrome.
DR.RESONANCE-at-next-wave-dot-net
> From: Julian Green [SMTP:julian-at-kbss.bt.co.uk]
> Sent: Thursday, June 11, 1998 8:09 AM
> To: tesla-at-pupman-dot-com
> Subject: Re: interference
>
>
> > From: bob golding [SMTP:yubba-at-clara-dot-net]
> > Sent: Wednesday, June 10, 1998 2:06 AM
> > To: tesla-at-pupman-dot-com
> > Subject: interference
> >
> > hi all
> > The nearest neighbor came and told us we are causing interference on
their
> > TV and cordless phone. We are in a brick built garage with a 20 foot or
so
> > overhead extension cable which is running next to the TV aerial. We are
not
> > using any chokes or emi filters yet. Could the lack of chokes be
causing
> > the interference? We have 2 6 amp emi filters which we can use in
parallel
> > if needed. Would moving the power lead down to ground level putting it
in
> > conduit and rerouting it away from the TV aerial help? Maybe running at
> > other than at prime time TV time might help. Like 2 am.
> > many thanks.
> >
> > bob golding lightning without rain
> >
> > bob yubba.clara-dot-net
> >
> >
> >
>
> You need filters to protect you NST. As for the interference your
neighor
> is probably too close - especially if you want to do some serious
coiling.
>
> Moving the power lead down to ground level might help, but my coil
> causes interference from 50 feet and then dropps off quickly. Do a walk
> test with a radio tuned to the resonant frequency of your coil.
>
> Watch out when your coil streamers strike large conductive objects. The
> arc generates lots of splatter which radiates nicely from the conductive
> object.
>
> Another 2am coiler
>
> Julian Green
>