Re: Help with calculating secondary self resonant freq?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz <teslalist-at-qwest-dot-net>" <acmq-at-compuland-dot-com.br>

Tesla list wrote:
 >
 > Original poster: "Ed Phillips by way of Terry Fritz 
<teslalist-at-qwest-dot-net>" <evp-at-pacbell-dot-net>

 >  > coil, the coil winding is 11.625 inches high 1662.375 turns of 34 gauge
 >  > enamel wire and the diameter of the coil 2 3/8 wide on standard PVC,

 > fr = 426.4 kHz
 > cd = 4.54 uufd
 > L = 30686 uh

 >         Be interesting to see what others get.

"translating":
11.625" = 29.53 cm
2 3/8" =  6.0325 cm, radius=3.016 cm
#34 wire has diameter=0.16 mm, so a better radius is 3.024 cm
Plugging these numbers in the Inca program, with 1662 turns, the
several calculation methods implemented give:
Wheeler    30.9196154870 mH
Lundin     31.0100380336 mH
Lorenz     31.0100900787 mH
Snow       30.9603149701 mH
Kirchhoff  30.9602456812 mH
Maxwell    30.9735485605 mH
They all agree reasonably at ~31 mH.
Combining 31 mH with Medhurst's self-capacitance, 4.55 pF: 423.77 kHz.

Antonio Carlos M. de Queiroz