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G3ZJO > TECH 27.12.05 14:41l 39 Lines 1096 Bytes #999 (0) @ WW
BID : 500139G3ZJO
Read: DL1LCA GUEST OE7FMI
Subj: Re: Coils
Path: DB0FHN<DB0FOR<DB0SIF<DB0EA<DB0RES<DK0WUE<I0TVL<ED1ZAC<GB7YKS<GB7SYP<
GB7YFS<GB7BEN
Sent: 051227/1114Z @:GB7BEN.#43.GBR.EU #:34414 [Bletchley] $:500139G3ZJO
From: G3ZJO@GB7BEN.#43.GBR.EU
To : TECH@WW
VK2ZRG wrote:-
> Any ferrite or powdered iron core placed in or near an solenoid coil
> will raise the inductance.
> A copper or brass core will lower the
> inductance and the Q.
Its the question I couldn't quite understand, due to a wee typo I beleive.
The smaller the core the less the effect. When building and getting coils
spot on I often 'throw' a ferrite bead into a, say 20mm dia coil.
I have made myself a homebrew version of the tuning wand which service
engineers used to use.
So useful for alignment and finding instabilty. Just wave the wand.
..........................................
Construction
Take a 100mm of plastic rod of suitable diameter to push inside a ferrite
bead, give it a dab of superglue to secure.
At the other end find a brass sleeve of suitable diameter and scure that.
...........................................
30 years ago these cost a weeks wages.
73 - Eddie, G3ZJO @ GB7BEN
Does know which end of a Soldering Iron to hold
Message timed: 11:14 on 2005-Dec-27
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