Therefore don't use software or even a calculator or slide rule or
arithmatic - use the charts in the handbooks. The difference in inductance
between tube and wire in a large diameter coil is easily compensated when
tweeking which will also compensate for self capacitance and proximity.
I would use cheap coax with the sheath removed as a prototype then make a
coil in tube. Squeeze or stretch as required. Proximity to nearby objects
will be a factor that is hard and unnecessary to calculate : just tweek.
Loads of fun.
David
G3UNA
> As this likely is going to be used on a band with a relatively wide
> range, say 40, 75, or even the
> 160 I was going to ask, what ever happened to the good old formula for a
> solenoid coil. You don't need to be precise, and should be able to
> change taps so it might be wise to have an extra turn or two. Still,
> what will be highest voltage likely be at the feed point of a bobtail?
>
> To me this is sorta like the; "measure with a micrometer and cut with a
> chain saw". How much accuracy do we really need?
>
> 73
>
> Roger (K8RI)
> >> Adrian MW1LCR
>>
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