Re: TVI (was snow on telly results)
Tesla List wrote:
> Original Poster: "Dale, Martin" <martin.dale-at-ntu.ac.uk>
> Hi all on the list,
> I had no response to the question below.
> It was intended as a serious question on a serious issue.
> I hope no-one took offense to it. In the absence of any info from US
> coilers (or any other countries), I am still wondering why we seem to get so
> many TVI problems from coiling here in the UK, that US coilers dont seem to
> I know of at least 4 guys local to me who had to give up because of TVI, so
> it may also be the reason why there are so few coilers in the UK!
> I hope this is not a "taboo" subject on the list.
> Any thoughts anybody has on the subject would be very much appreciated.
> Best wishes to all coilers, Martin Dale TCBON
> >As to why our American friends seem to get away without major TVI >problems
> >I'm not sure.
> >More space between houses maybe., cable TV., lower TV channel >frequencies?
> >Whatever it is, there sure 'aint any difference between UK RF and good old
> >American RF!
> >Any of you guys over there prepared to comment (please)?
> >Best regards everyone, Martin Dale, TCBON (also G6ABU!)
Perhaps we have less trouble because TV stations are more powerful, but
don't know about that. The main way to deal with the problem is through
restraint in operating hours.
Having said that, should report that I have a small coil, resonant
frequency about 280 kHz with 14" x 3" aluminum ducting toroid, and fed
through a Richard Hull cylinder gap from a 12 kV, 60 ma transformer;
gives 24" streamers. When I run it in the attic of my garage, I can
hear local radio station (20 miles away, 10 kW) without audible
interference, and experience very minimal "streaks" on the TV (both in
the kitchen, about 50 feet from the coill, and with power wires running
from the garage to the house). The first time I looked for interference
I was amazed at these observations. Coil is dismantled now, but next
time I operate it I'll make more complete observations.