[Amps] Pi Network

[Will Matney]

Chris,

I hate to say this, so don't take me wrong, but I found some 
inaacuracies with that software. After a certain size in L, the app will 
not hold the Q that you input for some reason. It's best to do the 
calculations by hand. I have an app here somewhere I wrote with Visual 
Basic named "Choke", if I can find it, speciffically for this. If I 
didn't delete it I'll e-mail you a copy or upload it somehwere. However, 
using the long formulas in most RF books will get you the same result. A 
good scientific calculator will do the formula with a breeze, or one on 
your computer that allows the full formula to be input at one time.

Will


Hello,

I have a question for the group. I have Jim Hawkins Pi network
calculator and the numbers the program are producing in the Inductor
calculator is not making complete sense to me. I need a little
clarification please.

If I enter a Dia. of 3” and a Length of 3” into the calculator blank
field, I get an approximation of 3 turns for the Coil and approximately
1” Spacing between each turn. My question is that if that’s correct
then why if I add the wire/tubing dia. In inches plus (+) the 1”
spacing, the overall length is now longer then the 3” length that I
originally entered in as the Length?

If I am using ½ tubing with 1” spacing then the overall length is now
5”. From beginning to end of coil in order to make up 3 turns, I have 2
complete turns with 2 half turns at each end of the coil. So I have 2”
in total tube material plus 3” inches of total spacing. Together I have
an over all length of 5” now vs. the 3” length that I originally called
out for?

I hope what I wrote makes sense if not I can try and elaborate.

One again thanks for the help!

Chris