COIL CALCULATIONS

You can use the CE program to calculate inductance vs dia,length,N turns, etc
at your freq of interest. Just ignore the ClassE design part and use the program
to futz around with the choke value, which can be changed at will (see HELP)

As an example:
Desire a 10 uhy coil wound on a 2 in dia form with 2 in length:
1) Start the program, assume freq of 3.8 mhz is correct (or change it),
 ignore power, volts, etc for the moment

2) Press <c> for Coil, Press <c> for Choke, Press <u> for Uhy
3) Enter 10 <ret>, the choke val is now 10.0 uhy

4) Press <c> for Coil, Press <c> for Choke, Press <d> for Dia
5) Enter 2 <ret>, the winding (inside) diameter is now 2.0 inches

4) Press <c> for Coil, Press <c> for Choke, Press <l> for Len
5) Enter 2 <ret>, the length is now 2.0 inches

As you make these changes, the program will continually reflect the changes
in N-turns and Q for each change that you input. 

The final coil has 17.0 turns of AWG #12 or 14 with a Q of about 380 at 3.8 mhz.
The ac resistance due to skin effect is about 0.62 ohms.
If you had 3 amps of RF flowing the I squared * R loss would be approx 6 Watts

You can check this out by Inputting power and voltage to a fake design
to make the other coil, the LS2+LS3 coil, approximately the same Rac
with 3 amps flowing.

Press <v> enter 45 volts, Press <p> enter 100 watts, Press <q> enter 10.
This sets IRMS for LS2 and LS3 = 3 amps.
Skin Effect Rac is 0.69 ohms (close to 0.62 above) so the loss in the
5.53u inductor is about 6 watts, as expected.

For Class-E rigs, the series current is approximately constant,hence
relatively independent of the "Class-E QL" parameter.

To see this, enter Q's from 2 to 20 and see that the series current changes
very little. However, Rac and LS change proportional to the "Q" value.

This means that the lower Q designs have less coil loss and additionally, 
less mis-tuning sensitivity.

Regards,
BobbyT  NU2B  15 May 2004