Re: Interference-SSTC

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

Original poster: "Jan Florian Wagner by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jwagner-at-cc.hut.fi>


> Hi all, how can i stop interference from my SSTC?It operates at around 
> 450khtz.
> Everytime I turn it on, the family goes NUTS!There is a large antenna above 
> the house.Could this cause the probs?

Depends on where exactly you are getting the interference, i.e. which
devices go bonkers?

There shouldn't be too much interference if you just use any el-cheapo
line filter that is rated for the current your SSTC draws. As well as
encasing your driver circuit (which is a good idea in any case, t.ex. to
protect your low voltage circuitry) and grounding the case.

SSTCs are "clean" compared to spark-gap TCs - much less interference with
stuff. TV interference is close to nil. I've a small spark gap TC, 100W,
which kills the TV screen even 15m away. With my small SSTC set to 100W
(via no. of pri turns), the same TV must be <2m close by, and even then it
causes only some minor stripe-effects in the picture.

Radio interference seems to be a bit worse, at least AM radio. There's not
much you could do about this except for rebuilding your SSTC to run at a
much lower frequency, 100kHz or so, which should move out your 
"high power SSTC radio transmission" from the vicinity of weak AM
transmitters.

Ok, "build a new SSTC" isn't a good suggestion, eh? ;o)

You _could_ try to make a faraday cage as your coil is small. I.e. make a
cage from chicken wire, place SSTC inside, carefully solder together the
edges of the cage, done. Whether or not this actually helps to solve
the interference problems, I don't know...

cheers,
 - jan

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