[HomeBrew] Coil linearity?

[R.J. Mattson]

Kwylow,
I have an Excel spreadsheet I made, that you can do a lot of "what ifs" with
coils dimensions and resonance's etc. If you have Excel, I can send u the
file.
Bob Mattson...W2AMI
http://www.qrz.com/callsign/w2ami

----- Original Message -----
From: "kwylow zinjanthropus" <catman351@yahoo.com>
To: <homebrew@mailman.qth.net>
Sent: Sunday, December 29, 2002 6:48 PM
Subject: [HomeBrew] Coil linearity?


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All:
Just wanted to know this. Is coil inductance linear with respect to turns?
For example, if I wound a coil evenly at 10 turns and it is valued at 1 uH,
can I assume that each turn is 0.1 H and that winding 5 more turns would
make the coil value 1.5 uH? I'm trying to wind a 30 meter coil for that AC-1
replica that I just built. The 40 meter coil is about 15.5 tpi and the plate
of the 6V6 dips at about 10 % of the plate cap value and the antenna load
cap doesn't affect the power out that much into a dummy load (50 ohms). I
guesstimated the plate cap value to be about 36.5 uuF (10% of 365 uuf) and
reverse engineered the coil to determine a value of the 40 meter coil (wound
with #22 magnet wire at 15.5 tpi). Of course, I used the formula
freq=1/(2*pi*SQRT(L*C)). Calculating the final turns per inch for a coil
with the plate cap at 25% (or 91.25 uuF) yielded a coil at 7 tpi #22 magnet
wire resonating at 10.115 MHz.
Let me know your thoughts on this and thanks. Cal, N6KYR.



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