Simple useful simulation tools
(DF4AE / UT5UAK)
Useful for HF network simulation.
My paper at Dorsten on design and simulation of HF PA: DF4AE_Dorsten08.pdf
cavity calculation. This EXCEL datasheet allows you to calculate
the resonance frequency of so-called "reentrant cavity" resonator. This
is one of the most common types of the cavities, used in fillters,
electon devices (klystrons, triode generator tubes), wavelentg
mesurement cavities, etc. In
the simpliest case it is a coupled cylindrical cavity with a tuning
screw along the axis.
Wind energy calculator. For your portable
activity from the top of a hill next to your home: estimate the
power a small wind turbine can produce.