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G4WYW > COILS 04.09.05 02:17l 36 Lines 1158 Bytes #999 (0) @ WW
BID : CE9621G4WYW
Read: GUEST DL1LCA OE7FMI
Subj: Re: Pile wound coil problem.
Path: DB0FHN<DB0RGB<OK0PPL<DB0RES<DK0WUE<7M3TJZ<F6KMO<ON0BEL<ZS0MEE<GB7FCR
Sent: 050903/2123Z @:GB7FCR.#16.GBR.EU #:65368 [Blackpool] FBB-7.03a $:CE9621G4
From: G4WYW@GB7FCR.#16.GBR.EU
To : COILS@WW
G0FTD wrote:-
> Can anyone shed any light on the following problem ?
>
> I have been constructing pile wound solenoids approx 8 x 3cm with 3 layers
> in them but I'm not convinced that the measurement I'm getting is correct
> on my equipment.
>
> Depending upon the frequency that I measure the inductance at (10Khz - > 400Khz)
> I see an inductance value between 150uH - 250uH which has several peaks and
> troughs when plotted against measurement frequency.
>
> I'm confused !
>
> How do I determine what the correct value is ?
I feel quite certain that your knowledge in this field far exceeds mine Andy
but I'm wondering if the ambiguity might be caused by such a simple thing as
the differences between using solid state metering and analogue (coil) type
metering.
Also, I'm wondering if a GDO (Grid Dip Oscillator) might provide you with a
meaningful solution.
I'm sorry I'm unable to help beyond the above but I would think that someone
on packet should be able to provide the answer you are seeking.
I would wager that a G2 station would know!
I wish you good luck in your quest.
MeL G4WyW
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