help with inductors and value figuring (low pass filters)

[9Lives]

I'm starting this thread in hopes some one knowledgeable will chime in and 1. Help me and 2. Put the info out there because i can't find much.

When designing LPF's for cb frequencies how would i go about figuring out what size wires(cores) to use and how many turns and how widely spread?

I love designing and constructing my own pcbs and learning about what I'm doing. Thanks.

 

[unit_399]

Try looking at these 2 sites. In the inductor design equation, c (radial depth of the wire) is the same as the wire diameter.

RC Low-pass Filter Design Tool

Tutorials, Designing Air Core Inductors
73s.

-399

 

[Shockwave]

Consider purchasing a LC meter off eBay. This will measure the value of inductance and capacitance for precise adjustment of those coils. They sell for as little as $10 and will be quite helpful in building filters.