Re: 3/4 wavelength secondaries


> An obvious 
>answer is to use a flat spiral secondary, as I believe Tesla envisioned, 
>to raise the Lp to the highest value, but I can't figure out how to build 

>Oh well, tomorrow is another day

The only way that I could see to build this is to make a bobbin that is just
the wire diameter high - 2 large flat steel plates lined with plastic sheet,
with a
suitable spacer in the middle, fix wire 
in centre and wind. Remove top, (it might go ping) slide off the top varnish
as you go, remove bottom. 

Just an idea