[TCML] The truth about LTR, STR, and resonant modes
Gary.Lau at hp.com
Thu May 29 09:05:39 MDT 2008
I think that DC is drawing a parallel between tuning a vacuum tube transmitter and Tesla coil. Plate current refers to the current drawn plate element of the transmitting tube. Dipping refers to noting when the current reaches a minimum value as some tuning parameter is varied. So you would vary your ballast while monitoring the line current. But having never used a ballasted coil, I can't comment on the tuning technique.
Regards, Gary Lau
> -----Original Message-----
> From: tesla-bounces at pupman.com [mailto:tesla-bounces at pupman.com] On
> Behalf Of Kris Grillo
> Sent: Wednesday, May 28, 2008 9:58 PM
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] The truth about LTR, STR, and resonant modes
> Could you elaborate on your "plate current" comment, I don't quite understand. I am
> interested in adjusting an inductive ballast for a power factor corrected to 1 without
> a meter. How do you go about this and how do you know when you have reached
> the correct power factor? I'm using a 4 pack of mots for the power supply. Would
> this apply even though they are shunted?
> DC Cox <resonance at wildblue.net> wrote: In addition to tuning the cap, we also
> tune the ballast and power supply
> with pole xmfrs to deliver the most efficient amount of current into the
> system for optimum spark production at any given voltage setting. We "dip"
> the supply current using our ballast control, and when the power factor is
> corrected back to 1.0 then you have max efficiency. Longer sparks occur
> when this setting is pushed up 10% but this does draw more current. Very
> similar to tuning a ham radio transmitter in which the operator "dips" the
> plate current to find the best resonant point before pushing higher power
> into the system. To do this properly one needs a power factor meter,
> however, lacking one, you can also do it by carefully monitoring your "plate
> current" and then adding 10% after the dip.
> Similar to what John is discussing.
> Dr. Resonance
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