RE: [TCML] Tuning primary to secondary with a scope

["Phil Tuck" <phil@xxxxxxxxxxx>]

Quote:" This is the reason scope tuning is of little value for accurate tune
at high power."
Well I don't agree with that statement, as besides getting a reasonably good
idea of primary position for starters it is the quickest way to try and get
a rough idea of streamer loading. Combine that with JavaTC whereby you can
put different primary tap positions in, and you have a lot less work to do,
and it will run 'out of the box' normally.

Quote" I thought you classic coil boys would be against all this modern
scope stuff anyway ;)"
Not in the least, I do have trouble getting replacement 1940's era valves
(tubes), though.

Regards Philip Tuck
www.hvtesla.com.

.


-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Colin Heath
Sent: 21 March 2012 15:12
To: Tesla Coil Mailing List
Subject: 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 ;)


Colin Heath

 
 

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
> www.hvtesla.com.
> 
> .
> 
> 
> -----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.
>> 
>> Phil
>> 
> 
> 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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