|Though the secondaries
look quite ugly on the picture, they are machine-wound without the
slightest mistake. After that I spent three days with painting the
coil with epoxy resin. The outer diameter is 4cm and the winding
length is 23cm. I used 0.25mmCuL.
At the moment the topload of one
coil is just a 6cm steel ball. But their capacity is far to small
for an efficient transfer of energy. So two toroids of 15cm diameter
will be built in future...
Because of the high resonant frequency I built two helical
primaries two archieve the maximum coupling between the two resonant
circuits. With 8cm diameter Ihad problems with rising arcs and
corona discharges. With 3.5 windings in total on a 10cm PP form, the
output at 400W are 25cm steamers.
With the new toroids (and real primaries...), I hope to have
streamers of 30-35cm.