Just thought I would pass on these tools that I found very useful in my recent experiments with PW mod filters, low pass RF filters and RF transformers. They make life much easier and may be of help for those who like to experiment and design stuff.
http://electronbunker.ca/InductanceCalcML.htmlI used this one to design a low profile 3 layer 120 uhy first inductor for a PW Mod filter.
http://www.changpuak.ch/electronics/butterworth_lowpass.phpThere are many others but i like this one the best.
http://www.electronicecircuits.com/electronic-software/mini-ring-core-calculator-programThis one pretty much does it all with toroids from DC to Microwave. Did my second and third ferrite PW modulator inductors with it.
Have fun, 73s Nigel
