A TC without sparks ???
Greetings fellow TC'ers,
I have a serious question for the more experienced ones among us,
which I am fairly sure will have been asked by someone here before.
I WANT TO HAVE MY TC MAKE NO SPARKS !
I have decided to build a synchronous rotary gap for my 2kW TC, in an
attempt to achieve three things:
1. Increased performance over RQ-gap,
2. Smoother running of the TC,
3. Hopefully less radiated interference.
I have taken real measurements from my ballasted supply, done some
simulations and decided on a 200BPS sync' gap. (Would be 240BPS in
the states.) This should give me 2 bangs per half cycle of the supply.
I am equipped with an oscilloscope, HV probes etc, and would like to
monitor the capacitor voltage in between adjustments at the setting-up
stage, __BUT__ I don't want sparks flying off my secondary while I
am making measurements !
I know that if I physically remove the secondary and toroid assembly,
then there will be no sparks, but I have been told that this will
eventually damage some components since there is no destination for
the primary tank energy. As far as I can tell, I need to provide
a loss in the primary circuit so there is somewhere for the power to
be dissipated. I have many high power resistors, quartz
security lamps... etc which were available as loads for ballasting etc.
MY QUESTION IS THIS:
Can I run my coil with the secondary removed, if I either:-
1. Fit a suitable resistance in parallel with my primary winding to
absorb the RF energy ?
2. Replace the primary winding with a suitable resistance ?
3. Insert a suitable resistance in series with the primary winding ?
Remember at this stage all I am interested in is the primary cap
charging characteristic. I know other people have done something like
Terry - Didn't you do some testing of spark gaps with the secondary
Finally, can anyone suggest what sort of change in performance I should
see going from a forced air cooled RQ-gap to a 200BPS sync' rotary on
a 2KW 4" coil with Cp=44nF.
- Trying not to make sparks (for now)
in sunny Newcastle.