RE: I've lost my k. Can someone help me find it?

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

Original poster: "John H. Couture by way of Terry Fritz <twftesla-at-qwest-dot-net>" <couturejh-at-mgte-dot-com>


Dan -

You may have seen the Open/Short test in my Tesla Coil Construction Guide

    K = sqrt(1-(Fo/Fs))  or  K = sqrt(1-(Ls/Lo))

Fo = frequency when secondary coil open
Fs = frequency when secondary coil shorted
Lo = inductance when secondary coil open
Ls = inductance when secondary coil shorted

There is also the Two Hump test

     K = Fh - Fl/Fr

Fh = High frequency hump
Fl = Low frequency hump
Fr = Resonant frequency

The K factor can also be found by the mutual inductance test shown in my
Tesla Coil Design Manual.

John Couture

----------------------------


-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Tuesday, September 24, 2002 6:56 AM
To: tesla-at-pupman-dot-com
Subject: I've lost my k. Can someone help me find it?


Original poster: "Daniel Barrett by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<dbarrett1-at-austin.rr-dot-com>

    Hi All-

    Can someone (Antonio???)  set me straight on how to calculate K given a
pri/sec assembly's lower (F1)  and upper (F2) resonant frequency?

    I'm a 'digital guy' so please don't flame me too bad for not knowing my
network theory too well ;)

    I got the impression *somewhere* that k = sqrt( F2/F1 - 1 ). However, I
suspect this may not be correct, and I can't figure out where I found this
tidbit.

    And I keep finding what appears to be some contradictory information as
I seach some the archives.

    I think I understand the 'count the number of half cycles per notch'
method, but my lack of appropriate HV/HA probe is preventing me from getting
a clean enough look at the ringdown on the scope to do this reliably...

Thanks, any help appreciated!

db