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RE: [TCML] first coil help
Thanks a lot for your answers! I will try to answer to the various
questions. Many thanks
NST. I have posted some pictures to Chip ("Thomas_first_coil_n_...). There
is a picture of my NST. There are two different earths on that NST - a "e"
one and a "T-like" one. Which one should be connected to RF ground??
Everyone: Spark gap and counterpoise
The spark gap is just .erm.a gap. I used two bolts pointing each other. I
can vary the distance easily. I was waiting to see how the coil was doing
before building a rotary spark gap.
Is a "complex" spark gap mandatory? From your answers. I fear yes.
I am not sure I understand the connections of the counterpoise; shall I just
use a large conducting surface placed under the coil (one cm under?) and
ground that surface to the main ground? Without connecting the secondary to
it? Please let me know.
The spacing of the primary is 2.5 cm pitch (center to center) of the 8mm
The secondary: I checked again and get 15 turns/cm. I am using "magnet wire"
-forgot to write down the gauge, sorry- but it is varnished (literature say
varnish is 10% of diameter). The form for the secondary is not conductive
(see below), so this *should* not influence the inductance (unless in
contains carbon powder, which would act like iron particles in a ferrite
core? But then inductance should go up not down?)
But I am measuring this inductance with the primary in place (though it is
not electrically connected to anything) - When I short the primary, L values
of the secondary go from 3.54 to 3.52
-I tried to draw an arc through the tubing I used for the secondary. The
black plastic is not conducting at all. I will use something else for my
next coil though.
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