[R-390] R-390A....align

[Bob Camp]

Hi

They swap with the adjacent set. As in - we save money if we buy 2X (or 4X or ..) as many of these cores instead of buying 1X the original permeability cores.

The other variable is how tight the cores fit in the coils. The less spacing between the wire and the core the (slightly) greater the effect of the core. The thickness of the coil form essentially is the other part of this variable. 

Bob

On Sep 3, 2014, at 1:15 AM, Pete Williams <jupete at internode.on.net> wrote:

> ​ Thanks to you all for the  suggestions...... I have made  a preliminary
> change  by swapping over slugs  from the adjoining rack... they  are
> labeled  Collins with
> the ID  526 - 5009      13,  and below is   SM - C - 249245, and below
> that  again is 6729.
> They OK in their original rack  but unfortunately, only produced identical
> setting to those installed  in the  4 to 8 MHz rack which were unmarked .
> Anyway the  data  above   rather academic  so will pursue  further....
> maybe have to live with it, but  even with  replacement  coil cans. results
> identical.
> A WIP  and  any revelations to follow.
> Thanks for  the interest.
> Pete  VK3IZ
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