Re: NEC-LIST: Coil-loading.

----- Original Message -----
> Styrofoam would work well, wouldn't it? The ice is a good idea though.

Hello All

If the coilform generates high electric stresses, you may get problems with
the aerating gas in styrofoam getting ionised - they use things like Argon
for the process which is easily dissociated. People building Tesla coils
(which secondaries are large single-layer solenoids) have had such problems.
The effect I suppose would appear as some shunt R across the coil, thus
de-Qing it.

A piece of work a few years ago reflected what others here have commented
on - geometry, orientation, weather conditions, proximity all affect
measurements of Q. Single-layer solenoids wound to be of non-optimal aspect
ratio (for Q that is) seem to see values upto maybe 500, altering by -20% if
the weather's damp, if you suspend the coil off the floor, if the floor's
concrete or wood, or is wet or dry, if the coil is horizontal etc.

Practical coils (i.e. wired into circuit) are unlikely to realise design
goals of greater than (say) 300-odd.

RMC, England

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