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G0FTD > COILS 27.12.05 14:27l 42 Lines 1510 Bytes #999 (0) @ WW
BID : 903192G0FTD
Read: DL1LCA GUEST OE7FMI
Subj: Re: Variable coil experiments ?
Path: DB0FHN<DB0THA<DB0ERF<DB0FBB<DB0IUZ<DB0GOS<DB0RES<DK0WUE<I0TVL<ED1ZAC<
GB7YKS<GB7SYP<GB7ESX<GB7NNA
Sent: 051227/1304z 75964@GB7NNA.#31.GBR.EU $:903192G0FTD [Witham, Esx]NNA V3.1
ZS6CFC wrote:-
> Dear Colonel
there's no need to be so formal - just call me Sir ;-)
> Remember the olde times , the crystal sets and its big open
> coils?
> Shure its effective to put a smaller coil (Former) into a
> bigger size.
> WHEN they both wound in the same direction.
> The trick is to have one reversed and make it moveable to
> adjust it in and out.
> Remember the Variometer? One turns inside the other -
> bucking or boosting?
True but it misses the point of the exercise.
The object of the exercise was to determine if a core material whose
diameter is much smaller than the coil winding (thus leaving a LARGE
air gap) would render the core material ineffective.
As you well know - the inductances we are all likely to see or use
would have the core material very close in distance to the actual coil
windings.
.-"""""-.
/ 73's de \
.-. | _ _ | .-.
(_. '._ | |_\ /_| | _.' ._)
-._'-.(_ A _).-'_.-'
'-._| _____ |_.-'
_.-'_\`"""""`/_'-._
.-.-'_.-' `-----' '-._'-.-.
(,_.'` `'._,)
Colonel Andy
Supreme Commander of the Trolley Platoon
And The Laughter Corps
www.southgatearc.org/articles/g0ftd/shopping_trolley_wally.htm
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