User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1
Mike Tucknott wrote:
> Say the coil need 5 turns to be in tune, you could built
> the primary with 10 turns and you could move the inner and
> outer taps points in or out but still keeping the 5 turns
> needed to keep the coil in tune, the inner and outer turns
> passed the tap point would be electrialy dead so to speak.
It's easy enough to model the case.
With a horizontal bipolar that looks like
http://abelian.org/tssp/201018a.png
Solenoid secondary 20cm diam by 1.4m length, 1000 turns.
Plane spiral primary inner 40cm diam outer 60cm, 10 turns.
Taps at 1 and 4.75 turns for 'inner' k setting.
Taps at 6 and 9.25 turns for 'outer' k setting.
These taps chosen to give similar Lpri so that a
Cpri 29.5nF matches the secondary resonance at both
k settings.
Infinite ground plane, no walls or roof.
k with inner two taps in use: 0.20
k with outer two taps in use: 0.178
Well, not a huge change but a wider primary would presumably
enable more k range. Time domain plot would probably reveal
any bad news about the volts on the free ends of the primary.
--
Paul Nicholson
--
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