Re: TVI/RFI Reduction. Empirical Results
Hi Michael and all,
Firstly: a big thank you for posting this information.
This is the first time I have seen a message which explains changes
that actually led to a definite improvement with TVI.
Secondly: Very interesting. Your findings agree with Terry's results.
His paper shows a reduction in high frequency noise when the primary
wiring was beefed-up.
Out of interest is the new cap of the same kind as the one which broke,
i.e. MMC, rolled poly, or is it made differently ?
I came to the conclusion that the gap is the "cause" of the really high
frequencies, did you change anything there ?
You said you added chokes and resistors, did you use any bypass caps ?
It is a pity that you didn't have time to find out which fix did the
trick, but it sounds like you have a much "quieter" coil for your
You said that you still get a few lines on the TV. Have you tried
recording a broadcast, and freezing a frame when you play it back.
I found that the horizontal lines were formed of dots at a regular
spacing across the screen. It would be nice if someone could
independently confirm this.
BTW. It never ceases to amaze me that a TC can radiate significant
amounts of power at frequencies as high as 900MHz !
That's nearly 5000 times my coil's resonant frequency.
"TVI, together we'll crack it"
- In sunny Newcastle.
On Mon, 5 Jul 1999, Tesla List wrote:
> Original Poster: "Coiler" <mycroft-at-access1-dot-net>
> More an FYI than anything else. I just re-fired my 6" coil tonight
> after it had been down for almost a month (Had to rebuild a dropped
> When I ran this coil before, I would trash television reception,
> Now, I admit, I don't know which of these changes actually did the deed, but
> the TV now only shows a couple of small interference lines, and the phone
> doesn't even notice.
> Moral of story: Watch the tank wiring. Chokes may yet serve a purpose on
> pig powered coils.
> Michael Baumann