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G3ZJO > COILS 28.12.05 00:44l 27 Lines 761 Bytes #999 (0) @ WW
BID : 510144G3ZJO
Read: GUEST DL1LCA OE7FMI
Subj: Re: Variable coil experiments ?
Path: DB0FHN<DB0RGB<DB0MRW<DB0WUE<DK0WUE<DB0RES<ON0AR<GB7ESX<GB7BEN
Sent: 051227/2319Z @:GB7BEN.#43.GBR.EU #:34473 [Bletchley] $:510144G3ZJO
From: G3ZJO@GB7BEN.#43.GBR.EU
To : COILS@WW
G0FTD wrote:-
> However on 160m I find that I need to be
> ablwe to control the inductance value mopre accuratly and I was thinking
> of having a sliding rod much like a dipstick arrangement.
>
A small core will saturate more easily.
Racal used what looked like 3 standard 6inch ferrite rods bound together
(in parallel) poked in and out the bottom of one of their commercial
designs. (Multiband, swiched, tapped, base loaded vertical).
We will leave out the fact that virtualy any bit of wire with an ATU is
far more efficient than the beast.
73 - Eddie, G3ZJO @ GB7BEN
C/O Room TNC, Packet Ward. (we are in here cause we like it)
Message timed: 23:16 on 2005-Dec-27
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