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Re: [TCML] Tuning primary to secondary with a scope
This is the reason scope tuning is of little value for accurate tune at high power.
By all means use scope to tune ballpark then full power runs followed by small primary tap changes is the way to dial in the final tune. Keep in mind this will change every time you run the coil in different surroundings.
I thought you classic coil boys would be against all this modern scope stuff anyway ;)
On 21 Mar 2012, at 09:54, Phil Tuck wrote:
> Snip" and in real life, the resonant frequency of the secondary comes down
> from the capacitive loading of the sparks, once it starts to break out."
> Yes that is something most people forget! I run dummy streamers out from the
> toroid (bits of wire contacting the toroid surface, but isolated the other
> end) and measure the secondary again. Different lengths and differing angles
> will all produce different results. I go for a figure a bit lower than the
> average result, and tune the primary to that.
> My secondary is 82 kHz while I tune the primary to 72 to 73 kHz. I try to do
> this at any venue that is inside, as ceiling height (usually 6 to 7 feet
> where I go) affects things considerably in a medium coil
> Moreover, if your coil only puts out 4 foot, there is little point in
> simulating a streamer with 5 foot + of wire!
> Regards Philip Tuck
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
> Of Jim Lux
> Sent: 20 March 2012 21:58
> To: tesla@xxxxxxxxxx
> Subject: Re: [TCML] Tuning primary to secondary with a scope
> On 3/20/12 12:40 PM, Phil Tuck wrote:
>> To scope the secondary I just remove the RF earth and feed the signal
>> into the base and use a probe as an aerial, as far away as you can
>> pick it up still. Even then if someone walks past [say] 8 foot away on
>> a medium sized coil, you can see the effect on the scope.
>> There is a difference in the results gained between scoping them
>> separately (probably the correct manner) or with both sitting in situ
>> on the coil, but only around two or three kilohertz, I find on mine.
>> As Gary states it's best to learn doing them separately, first of all,
>> to avoid possible confusion.
> and in real life, the resonant frequency of the secondary comes down from
> the capacitive loading of the sparks, once it starts to break out.
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