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Re: [TCML] Magnifier topics
--- On Thu, 2/11/10, Harvey Norris <harvich@xxxxxxxxx> wrote:
> The tertiaries I was planning on using for this
> experimentation are small in comparison to the secondary
> itself; they are 4.5 in OD PVC tube TC secondaries of 1 and
> 2 ft, the longer being 1791 ft of 23 gauge wire, and the one
> ft model being half of this at ~895 ft.
My craftsman had indicated 1521 turns by magic marker on the longer 2 ft secondary, this being determined by a makeshift mechanical counter he employed during winding but this can not be true in checking with pocket reference manual which specifies 41.3 turns/in. for insulated 23 gauge wire. The revised estimate of the two ft height/ 4.5 in. OD solenoid would then be 1167 ft, and the shorter 1 ft solenoid at half this value would be 583 ft wire length. Thus the tertiaries may now have closer correct nodal points from the standpoint of application with no attached toploads on them. Considering that by this this three fold division of nodes and antinodes by the 3/4 wave and considering considering that the tertiary should vibrate with what a quarter wave using 750 ft would deliver, the 583 ft winding solenoid need only vibrate 750/583 or 28.6% faster to make the same needed vibration. Since the shorter 1 ft solenoid only has a 2.66 ht/diameter ratio, the
needed increase of frequency beyond the quarter wave value may not fall close to projected parameters. On the other side of the coin the 2 ft solenoid, having its wire length of 1167 ft/ the needed tertiary quarter wave value of 750 ft would be a value 55% too high in wire length, but also producing a better % reduction of (predicted vs real) quarter wave value by virtue of the solenoids better h/d ratio of 5.3.
According to the
> interpretation being made here I see that I should be then
> aiming for a tertiary of 750 ft, of half of the secondary
> length. My next question becomes do these length ratios
> between secondary and tertiary, if not obeyed in the
> construction details detract from the magnifiers performance
> due to improper node and antinode placements?
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