Re: Tank Capacitance: what is the limit

Subject:   Re: Tank Capacitance: what is the limit
  Date:    Thu, 24 Apr 1997 17:06:36 -0700 (PDT)
  From:    "Edward V. Phillips" <ed-at-alumni.caltech.edu>
    To:    tesla-at-pupman-dot-com

"Another reason you can't easily use a giant capacitor, is that you may
to use less than one turn in the Tesla coil primary in order to tune the
        This was a well-understood problem with the "big boys" in
the good old days of spark transmitters in ham radio.  The maximum
wavelength (minimum frequency) was set to 200 meters (1500 kHz), and
in order to run the legal power limit of 1 kW input to a transmitter
some combination of a large capacitance and high transformer voltage
were required.  Maximum practical limit for voltage was around 25 kV,
so big capacitors were used too, resulting in one-turn tank circuit
inductors.  These were usually of wide copper strip, which was
continued into the rotary gap, which also used wide flat electrodes
in many cases.